Foreign Exchange Swap

A foreign exchange swap, or FX swap, is one transaction in which two parties exchange currencies for a near value date and agree to reverse the exchange for a later value date. Both rates and both dates are agreed at the outset.

An FX swap is often used for temporary currency funding, liquidity management, or moving an existing FX position to another settlement date. It is not the same as a longer-term cross-currency swap that exchanges periodic interest cash flows.

Key Takeaways

• The near and far legs are opposite purchases and sales of the same currency pair.
• A spot/forward swap uses spot as the near leg; a forward/forward swap has two future value dates.
• Swap points connect the near-leg rate to the far-leg rate.
• The sign and size of the points reflect the quote convention and relative currency funding prices; positive points do not automatically mean that the trade is profitable.
• A matched FX swap can reduce open directional currency exposure while still creating funding, counterparty, settlement, liquidity, and operational risks.
• Once the near leg settles, the remaining far-leg obligation resembles an outright forward.
• Rolling a swap requires a new transaction. The original far-leg obligation remains due even if replacement funding becomes unavailable or expensive.
• The correct control is to reconcile both currency amounts on both value dates, not only the notional or displayed swap points.

The Two Legs

Assume EUR/USD is quoted as USD per EUR and a party needs EUR temporarily:

The counterparty takes the opposite side of both legs. The trades are agreed together with one counterparty rather than executed as unrelated spot and forward transactions.

Worked Example

A firm has USD cash but needs EUR 1,000,000 for 30 days. It enters a spot/one-month FX swap. For this simplified example:

• near rate: EUR/USD 1.0800;
• one-month swap points: +18, where one point for this quote is 0.0001; and
• far rate: 1.0800 + 0.0018 = 1.0818.

Its principal cash flows are:

The USD amount increases by USD 1,800 between the two legs, while the EUR amount remains EUR 1 million. That USD difference is not a standalone fee or profit. It reflects the relative pricing of the two currencies for the period, together with basis and transaction terms. The firm also must return the EUR it received.

Economically, the firm lends USD and obtains EUR for the month, then reverses both positions. The use of the EUR cash, the opportunity cost of the USD cash, bid-ask spread, basis, collateral, credit terms, and operational costs determine the full result.

Common FX Swap Structures

The actual dates depend on the currencies’ business-day calendars and market conventions.

How an FX Swap Is Priced

The near leg uses the applicable near-date rate. The far leg is commonly expressed as:

Far-leg rate = Near-leg rate + swap-point adjustment

For EUR/USD quoted as USD per EUR, a simplified one-period covered-interest relationship is:

where:

• (S) is the near-date USD price of one euro;
• (F) is the far-date USD price of one euro;
• (r_{USD}) and (r_{EUR}) are comparable simple rates for the same period; and
• (\tau) is the matching year fraction.

Suppose the near rate is 1.0800, the 30-day USD rate is 5.00%, the comparable EUR rate is 3.00%, and the simplified year fraction is 30/360:

Rounded to four decimal places, the far rate is 1.0818, or approximately +18 points from 1.0800. The exact market price can differ because this teaching calculation omits cross-currency basis, bid-ask spread, credit, collateral, broken-date interpolation, and currency-specific day-count conventions.

The formula direction changes when the currency quote is inverted. Point size can also differ by currency pair and trading convention. Before applying a sign, state which currency is the base, which is the quoted currency, and whether the points are being added to or subtracted from the near rate.

Relative currency rates help determine the adjustment under covered pricing. Market quotes can also include:

• cross-currency basis;
• bid-ask spread;
• exact tenor and broken-date interpolation;
• trade size and market liquidity;
• dealer balance-sheet conditions;
• counterparty credit and collateral terms; and
• concentrated funding demand around reporting or holiday dates.

The two legs have opposite trade directions, so the applicable bid and ask sides must be constructed consistently.

Positive and Negative Points

Positive points mean the numerical far rate is above the near rate under the stated quote. Negative points mean it is below. Neither sign alone identifies profit, loss, appreciation, or depreciation.

For example, if EUR/USD were 1.0800 with -18 points, the far rate would be 1.0782. A party buying EUR near and selling it far would receive fewer USD per EUR on the far leg, but the economic comparison would still require both currencies’ funding rates and all transaction costs.

Bid-Ask and Direction Check

An executable swap quote must produce four signed amounts:

The EUR signs must reverse, and the USD signs must reverse. Analysts should validate the dealer’s all-in near and far rates rather than mechanically combining a spot side and a swap-point side whose conventions they have not confirmed.

Why Market Participants Use FX Swaps

Temporary currency funding

A bank, fund, or company can exchange cash held in one currency for another and reverse the exchange later. This can support a foreign-currency asset, payment, or liquidity need without leaving a permanent currency conversion.

Rolling a settlement date

An entity can offset a near-dated currency obligation and establish a similar obligation for a later date. The roll changes timing but does not eliminate exposure or guarantee future funding availability.

Suppose the firm in the worked example needs to retain EUR 1 million after the original far date. It enters a new swap whose near leg provides EUR 1 million. If the new near rate is 1.1500, the rollover-date flows are:

The firm needs USD 68,200 on the rollover date even though the EUR principal rolls at the same amount. This is a liquidity illustration, not the complete profit or loss: the new swap also creates another far-leg obligation at its agreed rate. If credit limits or market liquidity prevent the new trade, the firm must source EUR elsewhere to settle the original far leg.

Hedging foreign assets or liabilities

An FX swap can align currency funding with an investment or liability period. Mismatch in amount, maturity, cash-flow timing, or benchmark can leave basis risk.

Central-bank liquidity operations

Central banks may use swap arrangements or FX swaps as part of liquidity operations. Those official facilities have specific counterparties, terms, and policy purposes and should not be generalized from a commercial example.

FX Swap vs. Related Instruments

“Foreign exchange swap,” “currency swap,” and “cross-currency swap” should not be used interchangeably. Their cash-flow patterns and risk profiles differ.

Exposure After the Near Leg

Before settlement, both legs contribute to counterparty replacement exposure. After the near leg has settled, the parties still owe the far-leg principal exchange. BIS analysis notes that the remaining far leg is economically indistinguishable from an outright forward.

Even when the two legs use matched base-currency amounts, risk can remain through:

• changes in replacement value;
• failure of a counterparty before the far leg;
• funding needs if a payment is due before the incoming currency is final;
• collateral or margin calls;
• mismatch with the asset, liability, or hedge being funded; and
• inability to roll the swap at an acceptable rate.

Replacement-Value Example

After the near leg in the worked example settles, the firm must pay EUR 1 million and receive USD 1,081,800 on the far date. Suppose the current market forward rate for that same far date becomes 1.1000 USD per EUR and the applicable USD discount factor is 0.9980.

From the firm’s perspective, a simplified USD replacement value is:

The original far leg is worth approximately negative USD 18,164 to the firm under these assumptions because replacing the EUR payment now requires more USD than the contract will deliver. If the market forward were below 1.0818, the direction would reverse.

This shortcut assumes the market forward and discount factor already reflect the relevant curves and basis. A production valuation must use exact settlement dates, curve inputs, collateral terms, credit adjustments, and the contract’s closeout method.

Risks and Limitations

• Settlement risk: two legs can create four principal payments, and payment-versus-payment protection may not cover every trade.
• Counterparty credit risk: default can create a replacement cost and disrupt expected funding.
• Funding liquidity risk: the received currency must be returned on the far date even if the funded asset is illiquid or delayed.
• Rollover risk: a short-dated swap may need replacement when market liquidity or limits are worse.
• Basis risk: swap-implied funding can diverge from direct cash-market funding.
• Collateral risk: mark-to-market changes may require cash or eligible collateral.
• Operational risk: wrong dates, signs, amounts, or settlement instructions can create large payment errors.
• Legal and documentation risk: netting, close-out, and collateral rights depend on enforceable agreements and jurisdiction.

Settlement and Payment-versus-Payment

An FX swap can create two large principal settlements rather than small net interest payments. If one party delivers a currency but does not receive the other, the loss can approach the full principal delivered rather than only the trade’s mark-to-market value.

Payment-versus-payment settlement can reduce this risk by making final transfer of one currency conditional on final transfer of the other. It is not available for every currency, counterparty, or transaction. Where it is unavailable, firms should reduce the size and duration of settlement exposure through approved netting, limits, cut-off controls, and escalation procedures.

Review Checklist

1. Confirm the pair and which currency is received on the near leg.
2. Record both value dates and holiday calendars.
3. Confirm near and far currency amounts, not only notional labels.
4. Recalculate the far rate from the signed swap points.
5. Verify opposite directions and correct bid-ask sides.
6. Match the swap amount and interval to the funding or hedge need.
7. Review credit limits, collateral, netting, confirmation, and settlement method.
8. Plan repayment or rollover before the far date.
9. Compare the implied funding economics with direct borrowing after basis and costs.
10. Revalue the remaining far leg against current market forwards and reconcile collateral.
11. Stress-test failed rollover, settlement delay, counterparty default, and sharp FX movement.

Authoritative References

• Bank for International Settlements: 2025 Triennial Survey reporting guidelines defines FX swaps and lists spot/forward, forward/forward, and short-date structures.
• Bank for International Settlements: Bank positions in FX swaps explains the exchange and reversal of principal and the remaining forward exposure after the spot leg.
• Bank for International Settlements: International finance through derivatives statistics describes how an FX swap exchanges domestic cash for foreign currency and reverses the trade later.
• Bank for International Settlements: Covered interest parity lost explains forward points, implied FX-swap returns, and cross-currency basis.
• Global Foreign Exchange Committee: FX Global Code provides good-practice principles for wholesale FX risk, confirmation, payment-versus-payment, and settlement.

Knowledge Check

FAQs

Related Terms

• Forward Contract: A single future exchange whose payoff helps explain the remaining FX-swap exposure after the near leg settles.
• Forward Market: The market in which future currency delivery rates and replacement prices are observed.
• Covered Interest Parity: The simplified no-arbitrage relationship connecting spot, forward, and comparable currency rates.
• Cross-Currency Swap: A generally longer-dated structure that usually exchanges periodic interest cash flows as well as principal.
• Liquidity Management: Planning cash availability across currencies and value dates.
• Foreign Exchange Risk: The risk that currency movements change cash requirements or reporting-currency value.
• Basis Risk: The risk that swap-implied funding and the underlying asset or liability do not move together.
• Settlement Risk: The risk that one currency is delivered without receipt of the other.

This article is for financial education only. FX swaps can create significant principal-payment, funding, counterparty, collateral, liquidity, operational, legal, and settlement risks. It does not provide individualized investment, trading, derivatives, accounting, tax, legal, or hedging advice.