FX Swap

An FX swap is a transaction combining a spot and forward exchange contract: you buy a currency immediately and sell it back at a future date (or vice versa). The two rates are agreed simultaneously. FX swaps are not bets on currency direction; they are financing tools used by banks and companies to manage short-term liquidity and cross-currency funding.

Structure of an FX swap

A simple example: A bank needs dollars for 3 months but has euros on its balance sheet.

1. Spot leg: The bank sells euros for dollars at the current spot rate, say EUR/USD = 1.0850. It receives dollars.
2. Forward leg: Simultaneously, the bank agrees to sell dollars for euros at the 3-month forward rate, say 1.0750. It commits to returning euros.

Three months later, the bank returns euros and reacquires dollars. The total cost is the difference between the two rates: (1.0850 − 1.0750) = 0.0100, or roughly 100 pips. On €10 million, this is €100,000. For 3 months of dollar funding, the effective interest rate is about 0.3–0.5%.

This is often cheaper than borrowing dollars outright, especially if the bank has excess euros sitting on its balance sheet earning nothing.

FX swaps vs. currency swaps

Confusion abounds because “currency swap” can mean two different instruments:

FX swap: Spot and forward, same pair, usually short-term (under 1 year).

Currency swap: Exchanges of principal and interest payments in two different currencies over years. A US company borrows in euros and a European company borrows in dollars; they swap obligations to each other. Much longer-dated; rarely used by non-financial corporations today.

This entry is about FX swaps, the much more common instrument.

The swap points

The difference between the forward and spot rates is called the swap points (or “forward points”). In the example above, 1.0850 − 1.0750 = 0.0100 = 100 pips of forward points.

Swap points are determined entirely by interest-rate parity. If dollar rates exceed euro rates, the forward euro is weaker (costs more dollars per euro), and swap points are negative (the forward rate is lower than spot). If euro rates exceed dollar rates, swap points are positive.

Traders quote FX swaps by the swap points, not the absolute rates. A EUR/USD 1-year swap might be quoted as “minus 120 swap points,” meaning the forward rate is 120 pips lower than spot.

Who uses FX swaps

Central banks use FX swaps to provide dollar liquidity to their domestic banking system. During the 2008 financial crisis and again in March 2020 (pandemic), the Federal Reserve offered unlimited FX swaps to other central banks. These were emergency financing tools.

Banks use FX swaps to finance themselves across currencies. A Japanese bank with yen liabilities needs dollars; it can swap yen for dollars short-term.

Exporters and importers use FX swaps less often than forward contracts, but sometimes do when they need to park currency for a few months.

The interbank market

The FX swap market is the largest FX market by volume — roughly $1 trillion per day trades in FX swaps, compared to $400 billion in spot. Most of this is interbank (bank-to-bank). Bid-ask spreads are tight; transaction costs are minimal.

For a corporate client or small company, access to FX swaps is through a bank. Corporates rarely access the swap market directly because they lack the scale and credit to be counterparties on interbank trades.

See also