5. Use of Foreign Exchange Swaps by Central Banks

Tomás Baliño, and Lorena Zamalloa
Published Date:
September 1997
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A foreign exchange swap is a financial transaction in which two counterparties exchange specific amounts of two different currencies at the outset and repay at a future date according to a predetermined rule reflecting both interest payments and amortization of the principal (Bank for International Settlements, 1986, p. 37).

In the 1980s, different types of foreign exchange swaps (and other kinds of swaps, such as interest rate swaps and debt-equity swaps) became quite fashionable and received much attention in the press and in the economic literature. Most of these publications focused on the fast-growing interbank swap market. Less publicized, however, is that for several decades central banks have also used foreign exchange swaps. The dominant objectives of the central banks in using foreign exchange swaps are to affect domestic liquidity, manage their foreign exchange reserves, and stimulate domestic financial markets. This paper describes the various ways in which central banks use foreign exchange swaps to achieve these goals.

This survey is not meant to encompass all countries where central banks have used swaps, but rather to include countries that illustrate all broad categories of cases. Furthermore, information about central banks’ use of foreign exchange swaps is scarce because it does not usually appear on the balance sheet, and central banks often keep their swap operations confidential to avoid adverse signaling effects. Moreover, even if data are available, their quality is often uncertain, so crosscountry comparison may not be possible.

Foreign Exchange Swaps: Some Background Information

This section provides some general information about foreign exchange swaps and foreign exchange markets.

Definition and Pricing

In the 1980s, a common foreign exchange swap involved the exchange of streams of payments over time; that is, streams of interest payments are exchanged for the period between the initial and maturity dates. (For clarity, let us call this more sophisticated type of swap a “currency swap,” even though this distinction is not always made.) For a much longer time, however, a simpler type of foreign exchange swap transaction has been used in foreign exchange markets: only the principal amounts are exchanged on the initial and maturity dates at predetermined exchange rates. For example, one party sells U.S. dollars spot against deutsche mark and simultaneously buys U.S. dollars forward against deutsche mark from the same counterparty. This latter kind of swap is the most relevant here, because central banks tend to use it much more often than currency swaps.

According to the covered interest parity condition, the forward premium, or discount, reflects the corresponding differential between interest rates on the international markets. Thus, if S, the spot price of foreign currency (deutsche mark) in terms of domestic currency (U.S. dollars) equals 0.5, and if R (the domestic nominal interest rate) equals 12 percent a year and R* (the German nominal interest rate) equals 10 percent a year, our party in possession of a domestic asset worth US$100 can do one of two things: keep the domestic asset and sell it after a year, receiving (1 + R)100 = US$112; or sell it for US$100, buy (1/S)100 = DM 200, invest this in a German asset for a year, and sell the proceeds forward, at the forward exchange rate F. He would receive F/S(1 + R*) 100 = F(DM 220). Risk-free arbitrage should ensure that both strategies have the same return, that is, that no unexploited profit opportunities exist, so that US$112 = F(DM 220), or F= 112/220 = 0.509].1 The deutsche mark is at a forward premium to compensate for the lower German interest rate. In general

If we define the forward premium as f=(FS)/S=F/S1, then

In our example, f is approximately 2 percent, which is also the interest rate differential. This forward premium, sometimes called swap premium or swap rate, is what we consider the price of the instrument. In countries with well-developed forward exchange markets, this price is market determined, and quotes can be obtained from commercial banks.2

Covered interest parity should hold under perfect capital mobility if the assets considered are comparable in all aspects, such as default and political, or sovereign, risk,3 maturity, and tax treatment. Several studies have shown that covered interest differentials among Eurocurrency deposits, which are identical in terms of political risk, are essentially zero. Of course, allowance must be made for transactions costs. Four types of transactions costs arise with a covered outflow such as in our example: selling a domestic security, purchasing spot foreign exchange, obtaining a forward cover, and buying a foreign security all give rise to transactions costs. These costs give an upper and a lower band within which deviations from covered interest parity do not conflict with efficiency. Higher deviations may be due to sovereign risk, but also to less-than-perfect capital mobility (i.e., time lags or less than infinitely elastic arbitrage schedules) (MacDonald and Taylor, 1989, p. 258–59).4

Currency swaps (and also interest rate swaps and cross-currency interest rate swaps) are used by a wide variety of participants, for example, banks, corporations, thrift institutions, insurance companies, international agencies (the World Bank was a major driving force in the development of the market), and foreign states. There are four broad reasons to use swaps: (1) to exploit differences in credit rating and differential access to markets, thereby obtaining low-cost financing or high-yield assets; (2) to hedge interest rate or currency exposure; (3) to manage short-term assets and liabilities; and (4) to speculate. Central banks have been known to use currency swaps for hedging and asset-liability management, but very rarely (or seldom publicized; two such cases are discussed below). For this reason, the technicalities of those operations will not be elaborated upon; a good discussion can be found in Smith, Smithson, and Wilford (1990).

Central Bank Swaps in the Balance Sheet

When a central bank carries out a foreign exchange swap, it has significant economic effects. Assume, for example, that the U.S. Federal Reserve System buys foreign exchange with domestic currency and simultaneously “sells it back” forward, that is, agrees to sell the same amount of foreign currency at a certain date more than two days in the future at the forward exchange rate. As the Federal Reserve’s foreign assets increase, some item on the liabilities side must, therefore, increase, depending on the counterparty. If the latter is another country’s central bank, this institution’s account at the Federal Reserve is credited, meaning that the Federal Reserve issues dollars and the other central bank issues its own currency. As long as both central banks do not spend their foreign currency, however, there is no effect on currency in circulation or on banks’ reserves, and both money supplies remain constant.

If the counterparty is the banking system, banks’ reserves are credited with the domestic currency equivalent of the foreign exchange purchase, and banks’ foreign assets decline. Thus, reserve money increases, which normally causes an expansion of the money supply. (If the Federal Reserve had done a reverse swap—i.e., sold foreign exchange spot to domestic banks and bought it back forward—reserve money would have decreased, tightening the money market.)

Another possible approach is to treat such swap operations as collateralized loans. In analytic terms, expansionary foreign exchange swaps with deposit money banks are similar in form to direct loans by the central banks (as are discounting and rediscounting and repurchase agreements). Depending on a complex of legal, historical, and institutional considerations, negotiable financial instruments may continue to be registered as assets in the balance sheet of the deposit money banks; their reserves item would increase and be balanced on the liability side by “central bank discounts received” (International Monetary Fund, 1984, p. 53). In this case, the central bank’s balance sheet does not show an increase in foreign assets but in domestic assets (claims on deposit money banks). When the swap is unwound, both domestic assets and banks’ reserves return to their old levels, with an interest payment going into the central bank’s profit and loss account. This is the same amount as the interest earned on the foreign asset, adjusted for the difference between the spot and forward exchange rates.5

Another consequence of the expansionary swap (if the foreign currency is not considered as collateral, but as the actual property of the Federal Reserve) is the creation of a forward foreign liability for the Federal Reserve, matched by a forward domestic asset. This matched pair of contingent accounts can be booked on or off the balance sheet, depending on local practice. For instance, Turkey uses such a four-entry system (i.e., with both the current and the forward items on the balance sheet), but it is far more common to record only a change in gross foreign assets plus a change in banks’ reserves. A disadvantage of the four-entry system is that it inflates and complicates the balance sheet, but it has the benefit of showing clearly what part of the foreign reserves is only temporary, and, therefore, what exchange risk the central bank would be running if it lost its cover.

The swap in our example may not be intended as a money market tool; nonetheless, it still has the (temporary) expansionary effect on reserve money discussed above. Thus, if the swap were undertaken to gain foreign exchange or to provide banks with a forward cover, the monetary expansion it would cause along the way would have to be sterilized (assuming the country did not incidentally also need a monetary expansion at the same time). This means the Federal Reserve would have to sell some securities, for instance, bonds from a stabilization fund. The point is that the different goals for which central banks use foreign exchange often conflict.

A last topic that needs to be discussed is the risk for the central bank involved with foreign exchange swaps. When foreign exchange swaps are seen as collateralized loans, normally little risk is involved. The central bank need not worry about default risk because it has the collateral. Also, it is not exposed to exchange rate risk as long as it has the foreign assets to cover the forward foreign liability (neither of these need be shown on the balance sheet).6 There is exchange risk as soon as either the asset or the liability disappears—that is, if the counterparty defaults before the swap matures (the central bank would suffer a loss if its domestic currency appreciated), or if the central bank runs out of foreign exchange reserves, that is, when the country has balance of payments problems (the central bank would suffer a loss if the domestic currency depreciated). The latter situation has indeed occurred in many countries; this will be elaborated upon in later sections. Finally, there is a settlement risk involved with swaps, as is always the case in any foreign exchange operation—the so-called Herstatt risk. Although this risk is very small, it exists; it will be discussed more thoroughly in the next section, which provides some information about the nuts and bolts of (forward) foreign exchange transactions.

Foreign Exchange Markets

In foreign exchange markets, by convention spot transactions are settled on the second business day following trade. This is because the funds are ultimately transferred by having the central bank of the country issuing the currency transfer liabilities from the account of the sending party to the account of the receiving party. For example, if the Swiss National Bank (SNB) sells U.S. dollars to a Swiss commercial bank, it will ask the Federal Reserve System in New York to debit its account in dollars, and to credit the account of the U.S. branch of the Swiss commercial bank, or that of the latter’s American correspondent bank if the Swiss commercial bank does not have an account at the Federal Reserve. The SNB will credit the reserve account of the bank in question with the equivalent amount in Swiss francs. Thus, one part of the transaction takes place in Switzerland and the other part in New York. Owing to the six-hour time difference, when the SNB enters into this deal at, say, 12:00 noon, the New York market is not open. The central banks’ business closing hour is 3:00, so by the time the New York market opens, the Swiss market has closed. Also, it takes time for telex messages to be sent back and forth. For this reason, spot transactions take two business days to be settled.

The time difference also causes Herstatt risk, when one party is not able to receive another party’s currency after delivering its own because of delivery lag. This risk is called Herstatt risk after the Herstatt Bank, which went bankrupt in 1974. Many banks had bought U.S. dollars from Herstatt and had delivered their European currency obligations in the morning (German time), but Herstatt Bank’s operations were suspended before it could deliver dollars in return (Kamata, 1990). The delivery lag is made up by the time difference plus the difference between each country’s local time for final settlement. Table 1 shows that the deutsche mark is delivered nine hours earlier than the dollar, and so on. A central bank engaging in foreign exchange swaps is thus exposed to risk of default by its counterparty when it is trading foreign exchange because, after fulfilling its own obligation, it has to wait several hours for payment.

Table 1.Delivery Lags
Transaction TypeHours
Yen-U.S. dollar17
Deutsche mark-U.S. dollar9
Swiss franc-U.S. dollar12
Pound sterling-U.S. dollar8
Swiss franc-deutsche mark3
Deutsche mark-pound sterling1
Source: Kamata (1990), p. 68.
Source: Kamata (1990), p. 68.

In addition to dealing in the spot foreign exchange market, central banks engaged in foreign exchange swaps also enter the forward market. To be suitable for swaps as a money market tool, the forward market should be deep, and quotes of the forward exchange rate should be readily available. The first criterion ensures that large transactions are not disruptive. The second requirement means that central banks should preferably not be “making the market”; the price should be truly market determined. If the market were thin, and the rate were in effect determined by the central bank, swap transactions could have disruptive effects on exchange rate expectations.7Table 2 shows the currencies whose forward markets meet these requirements.

Table 2.Forward Foreign Exchange Markets
Trade with EaseLess Liquid, but Quotes

Readily Available
U.S. dollarDanish krone
Pound sterlingIrish pound
Deutsche markItalian lira
Swiss francFinnish markka
French francBelgian franc
Canadian dollarSpanish peseta
Japanese yenAustrian schilling
Netherlands guilderAustralian dollar
Singapore dollar
Hong Kong dollar
Kuwaiti dinar
New Zealand dollar
Malaysian ringgit
South African rand
Portuguese escudo
Thai baht
Saudi Arabian riyal
Norwegian krone
Swedish krone

Open Market Policy

In the following section, theory and facts are presented about the use of foreign exchange swaps as a money market tool in industrial and developing countries; such use differs noticeably between the two groups of countries.

Industrial Countries

In the past two decades, an increasing number of central banks in industrial countries have included foreign exchange swaps among the instruments with which they fine-tune domestic liquidity, even though actual use has remained limited in most countries.

As a result of the enormous increase in the volume, integration, and liberalization of international financial markets, and the emergence of new markets and instruments, a trend has developed for central banks to move from direct to indirect monetary policy. They tend to rely less on the fixing of interest rates through administrative means or on exchange controls, and more on instruments that are in accordance with market mechanisms, such as open market operations. In these operation, central banks buy (sell) foreign or domestic securities spot or forward or under condition of resale (repurchase) in order to ease (tighten) the market for bank reserves, thus influencing the interest rate. The bulk of money market operations takes the form of central bank credit (except, notably, in Switzerland), but a variety of other instruments are used for fine-tuning purposes, among them foreign exchange swaps.

Central banks use foreign exchange swaps for a number of reasons: (1) they prefer to have a wide range of intervention techniques at their discretion (possibly because they may wish to vary the predictability of their policy actions); (2) in many countries, the domestic short-term secondary market is not deep enough to permit market intervention (or is nonexistent), whereas the market in foreign exchange is generally active; this makes it possible to trade large volumes in any one deal; (3) unlike outright foreign exchange operations, swaps have no direct effect on the spot (or forward) exchange rate;8 and (4) swaps are a flexible instrument: technical procedures are informal, and swaps are inconspicuous and easily reversible.

Foreign exchange swaps also have a number of possible drawbacks. (1) They might influence the exchange rate after all, because of a strong announcement effect. (2) It takes two days for foreign exchange transactions to become effective, which makes foreign exchange swaps less appropriate for situations where swift action is required. (3) In foreign exchange transactions, there is no simultaneous exchange of one currency for the other, which gives rise to settlement (or Herstatt) risk.9 (4) Often, there are only a limited number of large banks that may act as counterparties; banks have to get the necessary dollars in the international market, and if the sum is large relative to their capital, a risk premium will be charged. Smaller banks therefore have a cost disadvantage. (5) If active short-term securities markets exist, central banks often prefer to conduct their operations in paper. This is probably because this market is more open to the rest of the economy than the interbank market (institutional investors and large corporations are also participating), which causes the market to be more efficient, with stronger competition and better price-setting. (6) If monetary policy focuses on interest rates instead of on a monetary aggregate, allocation of central bank credit might be a more suitable instrument, because the immediate effect of swaps is on the high-powered money supply.

Because swap transactions are temporary, they are suitable for short-term technical adjustment—either to influence the general liquidity of the market so as to neutralize the effect of fortuitous or seasonal factors (e.g., connected with note circulation or with the semiannual payment of oil taxes, as in Norway) or to bring about or maintain temporary market imbalances that can push interest rates in the desired direction (Banque Nationale de Belgique, 1990). However, swaps can easily be rolled over so that a longer-term impact can be achieved, and, in addition, the maturity of swap operations has been extended and now ranges from 24 hours to 24 months. Central bank foreign exchange swap operations may be conducted anonymously in the market at the maturities customarily traded there (1 week and 1, 3, 6, and 12 months), but more flexible contracts may be concluded bilaterally with banks. A common characteristic is that they generally involve U.S. dollars.

Switzerland is the only country where foreign exchange swaps are the main instrument for managing bank reserves, mainly because of the lack of short-term government securities (the Swiss government usually does not run a budget deficit). As can be seen in Table 3, SNB foreign exchange swaps became a permanent source of bank reserves in the early 1980s; contracts were regularly renewed and the total amount outstanding subsequently rose progressively, reaching in 1993 a peak of about 50 percent of the monetary base. Swiss foreign exchange swaps are almost exclusively effected in U.S. dollars, although marginal amounts have been traded in deutsche mark. There are three large banks that together have a monopoly position. The Swiss National Bank calls them in the morning to obtain quotes, and the transactions are carried out at the market-determined price.

Table 3.Evolution of Swiss National Bank Foreign Exchange Swaps
Average Amount Outstanding
YearIn billions of Swiss francsAs percent of the monetary base
Source: Schweizerische Nationalbank, Monatsbericht = Bulletin mensuel (various issues).
Source: Schweizerische Nationalbank, Monatsbericht = Bulletin mensuel (various issues).

Apart from Switzerland, the two countries that rely most on central bank foreign exchange swaps are the Netherlands and Germany. In both, short-term securities markets are extremely thin, but the central banks use foreign exchange swaps infrequently because they rely more on other open market instruments. In Germany, the Bundesbank has used foreign exchange swaps since 1958. For the first decade, it used contractive swaps both to influence the domestic money market and to stimulate short-term foreign investment by offering attractive swap rates. As of the late 1960s, swaps were motivated mainly by attempts to calm the international monetary situation and strengthen confidence in the dollar parity. Foreign exchange swap transactions have served the purpose of “fine-tuning” the money market only since 1979.

Besides swaps, the Bundesbank carries out foreign exchange transactions under repurchase agreements. These are essentially the same as swaps, but the ownership of the foreign asset does not change; that is, in a contractive swap, the Bundesbank’s net foreign assets are unchanged, banks’ reserves decrease, and the Bundesbank’s liabilities to domestic banks arising from repurchase obligations increase. Quantitatively, foreign exchange swaps and repurchase agreements have sometimes been of considerable importance. The instruments are used for fine-tuning, both to provide and to withdraw liquidity, so they do not make up a substantial part of the monetary base (Deutsche Bundesbank, 1989, pp.77-79).

Table 4 shows that the importance of the foreign exchange swap in the Netherlands was never great,10 and operations have been negligible since 1989 (although the instrument has not been officially abandoned). Their use has declined partly because of their aforementioned drawbacks, and partly because another open market instrument, the so-called special loan, has become more flexible and suitable to be used swiftly over the years (as can be seen from the increased frequency and the declining average maturity of this instrument). Also, the Netherlands Bank’s policy primarily targets interest rates instead of some monetary aggregate, and the most direct effect of swaps is on the monetary base.

Table 4.Special Loans and Foreign Exchange Swaps in the Netherlands(In millions of guilders: (+) easing; (-) tightening)
Average Amount Outstanding

Maturity in Days

Amount per Loan
In millions of

As percent of the

monetary base
Special loans
Foreign exchange swaps
Source: den Dunnen and de Wilde (1991), p. 66.Note: The average amount outstanding was calculated as a daily average, that is, frequency times average maturity in days times average amount divided by 360.
Source: den Dunnen and de Wilde (1991), p. 66.Note: The average amount outstanding was calculated as a daily average, that is, frequency times average maturity in days times average amount divided by 360.

Other countries that have used currency swaps (albeit very rarely) are Austria, Belgium, Finland, Ireland, Norway, and the United Kingdom (Bingham, 1985; Kneeshaw and van den Bergh, 1989; and various central banks).

Developing Countries

Now let us consider the usefulness of foreign exchange swaps as a money market tool for developing countries. The preceding discussion suggests that swaps could be recommended for countries that (1) wish to conduct monetary policy in a market-oriented way; (2) target a monetary aggregate; (3) lack a well-developed market for short-term securities (especially countries where there is no securitized government debt); and (4) have deep spot and forward foreign exchange markets. The latter criterion is probably the most binding; the countries that qualify can be read from Table 2.

Developing countries that do in fact use foreign exchange swaps include Kuwait, Saudi Arabia, and Malaysia, all of which meet the forward market criterion,11 and Oman, the United Arab Emirates, Bahrain, and Turkey, which do not.

Malaysia’s financial system is to a large extent liberalized. Interest rates on interbank borrowing and lending are essentially determined by market conditions.12 There is an active money market; interventions by the central bank (Bank Negara Malaysia) have usually been quite small and are designed to stabilize interest rates. The discount rates on various instruments are generally set in line with the prevailing money market rates; Bank Negara Malaysia does not announce a discount rate. It has a wide range of policy instruments: besides changes in statutory reserve requirements, it uses open market operations in government securities, rediscounting of commercial bills, recycling of government deposits, and foreign exchange swaps. The latter are not conducted as open market operations but as bilateral arrangements. Bank Negara Malaysia swap facilities provide liquidity to banks with a premium or discount in line with the interest rate differential, at commercial terms roughly equal to those that commercial banks charge their customers. The swap period does not exceed three months.

Rediscount operations have been of only limited importance in Malaysia. In the first half of the 1980s, recycling of government deposits and foreign exchange swaps were the principal instruments. In the latter half of the decade, swaps were increasingly replaced by open market operations and the issue of central bank certificates. Thus, as the market for short-term government securities matured, Bank Negara Malaysia preferred to use these securities for open market operations, even though Malaysia has an active forward exchange market.

The Central Bank of Kuwait (CBK) introduced a Kuwaiti dinar-U.S. dollar swap facility to provide liquidity to commercial banks in April 1978. The swap period does not exceed six months, and the forward rate is established by the central bank (at a market-related level). Individual ceilings apply to one- to six-month swaps, but not to swaps for shorter terms. Swap operations have played only a limited role since the introduction of treasury bill operations. They are intended essentially to adjust unexpectedly overdrawn bank positions at the central bank if a bank is unable to use the CBK’s treasury bill facility or sell foreign exchange to the CBK. Thus, the CBK apparently prefers operations with short-term government paper to foreign exchange swaps as a money market tool.

The central bank of Saudi Arabia (Saudi Arabian Monetary Agency, SAMA) also provides liquidity to banks through foreign exchange swaps at its discretion. These entail spot sales of U.S. dollars to SAMA with a repurchase agreement based on the market-determined forward exchange rate. Foreign exchange swaps are available only for short durations with terms decided by SAMA on a case-by-case basis. The swap facility is not a very important instrument in terms of size, but it has been quite helpful occasionally; for example, swaps were used during the recent regional crisis to provide the market with emergency liquidity.

The Central Bank of Oman started its swap facility in March 1980. It is basically a passive instrument; that is, all foreign exchange swaps (always expansionary swaps) are initiated by the commercial banks, each of which has an individual ceiling. One might argue that, in order to measure liquidity, it is more relevant to look at the potential capacity—that is, the ceilings—than at the actual amount outstanding.13 But while the Central Bank of Oman might stand ready to execute swaps up to the ceiling, it can do so only if commercial banks have the necessary foreign exchange, and it is difficult for the central bank to estimate the capacity of the banking system to attract foreign resources.

Initially, U.S. dollars were swapped at par (the Omani rial is pegged to the U.S. dollar; the exchange rate has been stable). This is, of course, related to the fact that there is no developed forward market in Omani rials, and the financial system is fairly regulated. The drawbacks of this situation became clear in 1986, when the domestic interest rate exceeded international rates. This gave the banks the possibility of risk-free windfall profits, leading to a peak level of RO 27 million outstanding in August 1986. In July 1986, the facility was modified to cure this flaw. A charge on the exchange rate was computed as the difference between a notional domestic rate14 and the Eurodollar rate. The outstanding swap amount subsequently declined sharply. In 1989, there was a squeeze on banks’ Omani rial liquidity, so use of the swap facility rose again to a peak of RO 35 million in April 1989. As can be seen from Table 5, apart from these peaks, the share of reserves acquired through foreign exchange swaps in the monetary base has been less than 1 percent.

Table 5.Foreign Exchange Swaps in Oman
Average Amount Outstanding
YearIn thousands of Omani rialsAs percent of reserve money
Source: Central Bank of Oman.Note: Annual average amounts outstanding were calculated as the average of end-of-month figures.
Source: Central Bank of Oman.Note: Annual average amounts outstanding were calculated as the average of end-of-month figures.

Another disadvantage of the way the swap system is organized in Oman (that is, not market determined) is that the central bank cannot do reverse swaps to withdraw liquidity because they would cause destabilizing expectations of exchange rate movements. The system is thus not very flexible: a change in strategy would be disruptive.

In Bahrain, a U.S. dollar swap facility provides liquidity in exceptional circumstances. Swap terms are set on a case-by-case basis largely for banks not holding treasury bills. The use of swaps has diminished considerably since the introduction of the repurchase facility for treasury bills in 1987. The United Arab Emirates Central Bank also offers a swap facility, with individual ceilings for banks. In the absence of a significant forward exchange market, no quotes can be obtained. The central bank sets prices on the basis of the dirham-U.S. dollar interest rate differential.

Turkey presents an interesting case. Monetary control has been exercised largely through the reserve requirement ratio, and, occasionally, through limits on central bank credit. Open market operations, which began in 1987, have been expanded, both by direct sales of government securities and through repurchase arrangements. They have been limited by the size of the central bank’s portfolio and, to some degree, by the thinness of the securities market. Interest rates on deposits were regulated until October 1988, when they were partially liberalized. The Turkish lira-U.S. dollar swap facility has been in operation for over a decade. The swaps are carried out as an exchange of mutual deposits; that is, the commercial bank places a foreign exchange deposit at the central bank and the central bank “deposits” Turkish liras at the commercial bank (it credits the bank’s reserve account). This gives rise to the four-entry system mentioned earlier. The foreign exchange deposit causes the central bank’s foreign assets to rise and creates a (forward) foreign liability. The Turkish lira deposit increases banks’ reserves and the central bank’s domestic assets. During the term of the swap, the central bank’s foreign asset is valued at the historical exchange rate, but its foreign exchange liability is revalued with the current exchange rate. Because the Turkish lira has steadily depreciated since the 1970s, the net of these four items is always negative. This net figure is what is called “foreign exchange swaps” in the Turkish banking system accounts. The interest on the Turkish lira deposit, which should in theory compensate for the capital loss, goes into the profit and loss account.

This treatment implies that no forward exchange rate is agreed upon; the central bank relies on the uncovered interest parity to hold. If the Turkish lira depreciates at a higher rate than the interest differential, it will suffer a loss; it can gain if the interest differential is greater than the rate of depreciation. The amount of swaps outstanding peaked in 1988, probably because the expected liberalization of interest rates in October 1988 would widen interest differentials substantially, thereby reducing the (expected) profitability of swap operations to commercial banks. The outstanding amount has decreased notably since then and has been virtually stable since mid-1990, when the central bank stopped actively using swaps.

Management and Acquisition of Foreign Exchange Reserves

Swaps are also used as a tool for the management and acquisition of foreign exchange reserves, with both the banking system and other central banks acting as counterparty. Such use sometimes coincides with the use of swaps to stimulate the domestic financial system.

Asset-Liability Management

Central banks are under more pressure now to manage their assets actively than they were in the past. Although the need to defend the exchange rate often constrains central banks’ investment strategies, they too have to search for better returns. But, since intervention in the foreign exchange markets requires instant access to reserves, liquidity is crucial. In determining the currency composition of their reserves, some central banks take account of the currency composition of their country’s import basket, with higher weights for currencies with liquid bond markets and for the currencies that a country uses for intervention. This provides a rationale to use currency swaps to temporarily adjust the currency distribution when it has been distorted as a result of intervention. The Central Bank of Norway uses currency swaps15 and forwards to maintain the liquidity of its assets while leaving the currency distribution unchanged (Cookson, 1992).

Currency swaps also provide cross-currency hedging (and interest rate hedging if cross-currency interest rate swaps are used). This is done when foreign assets are in different currencies from foreign liabilities. In developing countries, managing foreign assets and liabilities is not so much about maximizing returns while maintaining liquidity for reasons of exchange rate policy; often, it is more a matter of minimizing the inevitable financial risk. One way to minimize risk is to improve the matching and currency composition of foreign asset and liability structures. Currency swaps can be used in this framework for cross-currency hedging. One developing country that has engaged in such activities is Trinidad and Tobago. The country has considerable external debt, denominated in Japanese yen, which was partially taken over by the central bank. The widely fluctuating foreign reserves (mainly earnings from oil exports) are largely in U.S. dollars, because the Trinidad and Tobago dollar is pegged to the U.S. dollar. The central bank has used currency swaps to hedge against changes in the U.S. dollar-yen exchange rate, as well as swaps from floating-rate into fixed-rate liabilities.16 Yet another rationale for using currency swaps in asset-liability management is to influence published official foreign exchange asset positions, that is, to hide the real fluctuations in them. The Banque de France has been reported to do that, but many others may also be doing so quietly, since it is unlikely to be public knowledge.

Acquisition of Foreign Exchange Through Swaps Among Central Banks

Foreign exchange swap transactions that are made as part of a strategy to acquire foreign exchange reserves can be divided into two broad categories: (1) those carried out in the market, that is, with the banking system as counterparty, and (2) those with other central banks as counterparties. This subsection deals with the latter category.

If central banks deem it necessary to intervene heavily in the foreign exchange market but their supply of foreign reserves is insufficient, they may acquire the reserves they need by drawing on a swap line with the corresponding central bank. For this purpose, the U.S. Federal Reserve swap network exists; this is a system of reciprocal short-term credit arrangements between the Federal Reserve and 14 other central banks and the Bank for International Settlements. It enables the Federal Reserve to acquire the currencies it needs for market operations to counter disorderly market conditions, and it enables the swap partners to acquire the dollars they need in their own operations. As of March 1996, the swap lines amounted to $32.4 billion (see Table 6).

Table 6.U.S. Monetary Authorities’ Currency Agreements(In millions of U.S. dollars)
InstitutionAmount of FacilityOutstanding on

March 31, 1996
Federal Reserve Reciprocal Currency Agreements
Austrian National Bank2500
National Bank of Belgium1,0000
Bank of Canada2,0000
National Bank of Denmark2500
Bank of England3,0000
Bank of France2,0000
Deutsche Bundesbank6,0000
Bank of Italy3,0000
Bank of Japan5,0000
Bank of Mexico3,0000
Netherlands Bank5000
Bank of Norway2500
Bank of Sweden3000
Swiss National Bank4,0000
Bank for International Settlements
Dollars against Swiss francs6000
Dollars against other authorized
European currency1,2500
U.S. Treasury Exchange Stabilization Fund Currency Arrangements
Deutsche Bundesbank1,0000
Bank of Mexico regular swaps3,0000
United Mexican States medium-term swaps10,500
Source: Board of Governors of the Federal Reserve System (June 1996).Note: Facilities available to Mexico consist of short-term swaps between the Bank of Mexico and both the Federal Reserve and the Exchange Stabilization Fund (ESF), as well as medium-term swaps and government guarantees between the government of Mexico and the ESF. The total amount available from both medium-term swaps and government guarantees is $20 billion less any outstanding drawings on the short-term facilities and securities guarantees.
Source: Board of Governors of the Federal Reserve System (June 1996).Note: Facilities available to Mexico consist of short-term swaps between the Bank of Mexico and both the Federal Reserve and the Exchange Stabilization Fund (ESF), as well as medium-term swaps and government guarantees between the government of Mexico and the ESF. The total amount available from both medium-term swaps and government guarantees is $20 billion less any outstanding drawings on the short-term facilities and securities guarantees.

Swap drawings to finance official exchange intervention do not affect the money supply under these operating procedures. For example, if the Federal Reserve draws on the swap line with the Bundesbank to finance a market sale of deutsche mark, U.S. bank reserves are depleted when the Federal Reserve sells mark for dollars, but the same amount of dollars is created by crediting the Bundesbank’s account at the Federal Reserve. The Bundesbank, which does not immediately need the dollars, invests them in U.S. securities so that these dollars find their way back into U.S. bank reserves (Kubarych, 1978, p. 19).

These Federal Reserve swaps were prominent in the late 1970s, but their importance has diminished since then (although the swap lines have increased). Because swap transactions inevitably mature, they are suitable for short-term adjustment, to smooth irregularities. For this kind of operation to make sense, the exchange rate must be—or be believed to be—only temporarily diverging from a known trend level. The persistent random movements of the dollar vis-à-vis other major currencies suggest that this is not the case.17

More recently, the U.S. monetary authorities activated the use of short- and medium-term swaps to support the Mexican peso. In early 1995, the Federal Reserve and the U.S. Treasury substantially increased their short-term swap lines with Mexico, reaching a peak of US$12.5 billion at the end of September 1995. In addition, as part of the U.S. financial package signed in February 1995, the U.S. Treasury established a medium-term swap facility with the Mexican government under the Exchange Stabilization Fund (Table 6). At the end of March 1996, US$10.5 billion of medium-term swaps remained outstanding. However, in early August 1996, the Mexican authoritises prepaid US$7 billion of the medium-term U.S. swaps.

Swaps between central banks need not arise for foreign exchange intervention purposes exclusively; they can also be connected with trade. For example, Guatemala and Costa Rica swapped their currencies in the early 1980s to deal with regional trade deficits. (Because Guatemala failed to repay the Costa Rican colones, this swap has turned into a long-term loan from Costa Rica.)

Acquisition of Foreign Exchange Reserves in Situations of Scarcity

Some central banks have used foreign exchange swaps and gold swaps to acquire foreign exchange reserves in situations of scarcity. However, when a central bank’s foreign exchange position is uncovered, the central bank will suffer a loss if a depreciation occurs during the interval.

Foreign Exchange Swaps

Many developing countries suffer from a structural dependence on foreign trade and assistance, substantial external indebtedness, and wide fluctuations in their export earnings on the one hand, and a steady demand for imported basic goods on the other. These countries must hold foreign exchange reserves to prevent excessive short-term fluctuations in the exchange rate. Of prime importance is liquidity: foreign exchange should be readily available to meet essential needs (including the servicing of foreign liabilities) (Blackman, 1982).

When faced with an acute shortage of liquid foreign exchange reserves, central banks in a number of countries resorted to swaps to increase their gross foreign exchange holdings. Examples are Chile, Argentina, Uruguay, Ecuador, the Philippines, Indonesia, and the Republic of Korea.

Argentina experienced a balance of payments crisis starting in 1982, whereupon it announced a number of far-reaching measures to deal with it. These included foreign exchange swaps with domestic banks and residents in possession of foreign exchange deposits (e.g., importers). Also, domestic banks and corporations with foreign debt that had to be serviced were encouraged to renegotiate the debts by asking for suspension of payment and new loans. If they were able to renegotiate, they were allowed to pay the domestic currency equivalent of their debt service to the central bank (BCRA), which would take on the U.S. dollar liability. This procedure amounted to an exchange rate guarantee for the remaining life of the debt.

Considering the desperate reserve position, both measures exposed the BCRA to exchange rate risk, because it could not cover these foreign liabilities. Without cover, it depended on the uncovered interest parity to hold; the swap premium should be related to the expected rate of depreciation. The BCRA could not set its swap rate in this way, because it had to set a preferential rate to attract the swaps and because the announcement effect of a “realistic” swap rate would cause undesirable capital movements. Consequently, the BCRA suffered huge losses, with negative external operating results equivalent to about 0.5 percent of GDP on average during 1984–92 (Banco Central de la República Argentina, various issues). Other countries where central bank foreign exchange swaps have led to large losses from the depreciation of the domestic currency are the Philippines and South Africa.

In 1982, the Central Bank of Chile tried to gain reserves by establishing a swap facility for banks. In this operation, it bought U.S. dollars at the central exchange rate minus a commission depending on the swap’s maturity. The sale of dollars back to the commercial bank occurred at the exchange rate of the initial transaction adjusted for the difference between domestic and foreign inflation during the swap period. The covered interest parity condition was not taken into account, so it was possible to engage in arbitrage. The swap provided a real, but not nominal, exchange rate guarantee. The use of the facility was limited, depending on the origin of the foreign exchange and on the funding of the commercial bank.

Although swap operations did not cause exchange losses in Chile, the central bank started restricting them in 1990 to discourage short-term capital inflows, which were considered an undesirable source of net international reserves, and to help depreciate the exchange rate. Moreover, the central bank felt it should not provide exchange rate guarantees. Therefore, it adopted a series of measures. The commissions on swaps were raised sharply to offset the differential between domestic and foreign interest rates. Also, the exchange rate used in the swap transaction was changed from the central exchange rate to the rate observed in the market.

Korea’s financial sector is subject to a number of regulations, including direct credit controls, interest rate ceilings, and collateral requirements. Before 1986, Korea had a persistent balance of payments deficit, so foreign exchange reserves were scarce. The central bank of Korea engaged in swaps with foreign commercial banks, which were not allowed to establish a network of local branches. As a result, the domestic currency funding of these banks was very limited, and so, to acquire working capital, they borrowed from their head offices and swapped the proceeds into Korean won. The swap rate was chosen to provide an incentive for capital inflows, and individual bank swap limits were regularly increased. Also, two development institutions were allowed to borrow abroad and swap the proceeds for won with the central bank. The larger part of these swaps was sterilized by the monetary stabilization account and by the sale of monetary stabilization bonds. In 1986, Korea’s balance of payments went into surplus, which eliminated the need for swaps. The local branches of foreign banks were granted access to the discount window of the Bank of Korea, and they were allowed to issue certificates of deposit. The swap limits have not been increased since then.

In summary, the use of foreign exchange swaps in a situation of providing a short-term capital inflow. However, they also have an expansionary monetary effect that has to be sterilized; if there is no (active) forward market, the central bank must set a swap rate that can have adverse signaling effects. Moreover, if the country is experiencing a severe crisis, using swaps to boost gross foreign exchange reserves temporarily will only delay the necessary adjustment. And, above all, if the central bank cannot keep its position covered (as in times of speculation against the currency), it is liable to suffer exchange losses. In Argentina, these negative effects clearly outweighed the benefit. There are examples of countries (such as Korea), however, that do not seem to have experienced particularly adverse effects, so the instrument cannot unambiguously be judged to be unsatisfactory.

The use of foreign exchange swaps to gain reserves is difficult to distinguish from central bank swaps used to stimulate financial markets or subsidize certain activities. Examples of the latter use are central banks acting as market-maker in forward foreign exchange markets, providing forward cover and exchange rate guarantees, subsidizing domestic financial institutions and attracting foreign investment. Some of these activities amount to quasi-fiscal operations involving subsidies; they have been quite common in developing countries. Regardless of the purpose, these operations are similar to those discussed above: they amount to the central bank taking an open position, thereby assuming an exchange rate risk that often results in large losses. These kinds of activities are not recommended in general. Central banks can do more to stimulate financial markets by conducting a credible exchange rate policy. Subsidies should be on the government budget, and the financial sector does not gain in the long run if its central bank incurs substantial losses, which most often have to be monetized.

Gold Swaps

Gold swaps are another way to obtain liquid foreign resources. Those swaps are loans in foreign currency backed by deposits of gold. The classic operation consists in selling the gold at the current price (with delivery within two days of agreement on the sale price) and repurchasing the same gold at a future date. Such an operation makes it possible to obtain temporary financing while paying an interest rate below the current market rate (the risk premium is reduced because the gold serves as collateral).

Swaps are concluded for between 3 and 12 months, with the sale price being the market price on the day of the transaction. The repurchase price is fixed at the same level, plus interest accrued at the interest rate on loans in the currency in which the deal was carried out (the London interbank offered rate (LIBOR) usually serves as the basis). When the swap matures, it can be either liquidated or extended. If the foreign currency is not repaid, the lender can hold the gold as a guarantee. The Bank for International Settlements can organize swaps for currency amounting to 80 percent of the value of the gold involved and provides general information on this type of operation.

Ecuador and Uruguay have been active in gold swaps, swapping gold for Swiss francs. As long as the central banks keep their positions covered—that is, they hold on to the foreign exchange to make sure they have a matching asset by the time the swap matures—there is no exchange risk involved. Unfortunately, when reserves are scarce, this cover is often neglected, so that the bank will suffer a loss if the domestic currency depreciates during the interval.

Central Bank Losses

As was discussed above, swaps can cause substantial central bank losses, with a number of negative effects on the economy. Large losses erode the central bank’s capital, which may jeopardize its independence. Moreover, the losses represent an injection of liquidity, which might make it necessary for the central bank to issue additional interest-bearing liabilities. This policy embodies a risk that future losses may grow exponentially. Persistent central bank losses could lead to inconsistency in the use of monetary policy instruments, as the bank tries to absorb liquidity while at the same time it is under pressure to implement an expansionary policy as a way to reduce future losses. Thus, central bank losses embody an inherent bias toward generating inflationary surprises (Vaez-Zadeh, 1991).

Summary and Conclusions

Central banks of industrial countries use foreign exchange swaps to fine-tune the money market, to acquire foreign reserves for intervention purposes, and to manage their assets and liabilities. In some developing countries, central banks also use foreign exchange swaps to control bank liquidity, defend scarce official reserves, and stimulate or subsidize the domestic financial system.

As a money market tool, foreign exchange swaps are flexible and can be used in the absence of a developed short-term financial market. The operations should preferably be conducted in accordance with market mechanisms; therefore, a deep and well-developed forward foreign exchange market is necessary for the instrument to function smoothly.

As a means of defending foreign reserves in times of balance of payments problems, foreign exchange swaps are considerably more questionable. In countries where those problems are acute, swaps can have adverse effects because they leave the central bank with an open currency position that almost always leads to losses. For the same reason, using central bank swaps to stimulate the development of financial markets is not recommended. Central bank losses could seriously damage monetary policy and, thus, monetary stability. In countries with moderate and temporary balance of payments difficulties, swap schemes can be useful temporarily to boost their countries’ gross foreign exchange reserves.

On a worldwide scale, central bank foreign exchange swaps appear to be losing favor; in the large majority of countries, swap facilities have been restricted or have not been used in recent years. This is probably connected with the ongoing development of financial markets around the world; as short-term securities markets develop, swaps become less attractive as a money market tool. Furthermore, the poor experiences of countries that have relied on swaps in more difficult circumstances have discouraged their use.


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Note: The author wishes to thank Tomas J.T. Batirlo, Tom Nordman, Anton Op de Beke, Steve Gilmore, Sohail Qureshi, numerous desk officers, and, especially, Daniel Hardy for valuable comments and support.


Abstracting from bid/ask spreads.


However, even in such deep markets as those for the U.S. dollar and the deutsche mark, forward markets formally extend to maturities of only one year.


The possibility that the foreign country may impose exchange controls before the bill matures.


Under covered interest parity, foreign bonds on which forward cover has been obtained are perfect substitutes for domestic bonds. If, in addition, one assumes that investors are risk neutral, a stronger version of perfect capital mobility applies. In this case, speculation will bring the forward premium on foreign exchange into equality with the expected rate of appreciation of the foreign currency. This means the forward exchange rate should serve as an unbiased predictor of the future spot rate, so that the uncovered interest parity condition holds:


A large number of studies have found that this condition often does not hold (see McCallum, 1992; Eaton and Turnovsky, 1982), but an explanation for the deviations remains elusive.


The Deutsche Bundesbank has an operation (“foreign exchange transactions under repurchase agreements”), very similar to a swap, that is treated in this way (see section on Open Market Policy, Industrial Countries).


There is, of course, the risk of opportunity costs: If the domestic currency depreciates by more than the forward premium during the term of the swap, at maturity the foreign asset has to be sold at the agreed forward rate, whereas it could have earned a better rate on the spot market.


The forward rate is equal to the expected future spot rate. Thus, if the central bank, which is supposed to defend the currency, were to set the domestic currency at a forward discount, this would have a strong announcement effect on the spot foreign exchange market.


Swaps can be seen as analytically similar lo temporary operations in domestic securities: there is a direct impact on banks’ domestic currency reserve balance at the central bank, but the exchange rate will normally be influenced only to the extent of the impact on interest rates (Kneeshaw and van den Bergh. 1989). Of course, this may amount to the same thing, as interest rate policy and exchange rate policy are often inextricably connected


Abstracting for the moment from the possibility that the central bank ends up with a net short position in foreign currency (which would give rise to exchange risk much larger than the settlement risk) because in such situations central banks would not be using swaps as a money market tool.


The average amount outstanding is given here for comparison with other count ries. As the use of foreign exchange swaps is becoming more infrequent, this figure is increasingly meaningless: for example, as can be seen from the table, the f.3 million outstanding on average in 1987 was in fact f. 1,010 million for just one day, and zero for the rest of the year.


South Africa also qualifies, and it uses swaps, but not as a money market tool.


Before 1978, interest rates were kept low relative to International rates. There still is a policy of supplying loans to priority sectors and special groups at low cost.


The total swap ceiling on the banking system rose from RO 12.7 million in 1981 to RO 50.6 million in 1986. After that, ceilings became variable, with different costs for different portions.


Assumed to be equal to the maximum allowable one-year rial deposit rate of 8.5 percent plus a variable margin initially set at 0.5 percent.


These are currency swaps involving the exchange of streams of interest payments, not foreign exchange swaps.


Managed to realize profits in currency swaps of US$40 million (1 percent of GDP) in 1988, but shifted to a loss of US$47 million (1.2 percent of GDP) in 1989. Information about the exact details of these contracts was not available, but this result was probably connected with the fact that foreign reserves were very low in 1988 and 1989, so that the central bank still ended up with an open position. No such operations were undertaken after 1989.


If the exchange rate follows a random walk, all shocks are permanent; that is, there is no trend level to which it returns. If the shocks are believed to be random, however, the interventions should have a permanent effect. From the fact that swap-financed interventions have largely been abandoned, we might therefore conclude that policymakers are more inclined to regard the exchange rate as following a random walk.

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