What it means
The mechanics run in three stages. The parties exchange principal amounts at an agreed exchange rate at the start, each then pays interest to the other in the currency it received throughout the life of the swap, and at maturity they re-exchange the original principal amounts at the rate fixed on day one.
The commercial logic is comparative advantage. A company is usually best known and cheapest to fund in its home market, so two companies with mirror-image needs can each borrow where they are strongest and then swap, ending up with the currency they wanted at a lower combined cost than either could have achieved alone.
Swaps come in several combinations. A fixed-for-fixed swap exchanges fixed rates in both currencies, a fixed-for-floating cross-currency swap combines a currency exchange with an interest rate exchange, and the pricing difference between the two legs is known in the market as the cross-currency basis.
The risks are not trivial. Each side depends on the other continuing to pay, so counterparty risk is real, and because the value of a swap moves with both interest rates and exchange rates, most agreements now require collateral to be posted as the position moves.
Central banks use the same instrument at a different scale. Swap lines between central banks allow one to supply its currency to another during a funding squeeze, which prevents banks in the receiving country from being cut off from a currency they need to settle obligations.
In practice
Real-world examples.
Example
A machinery maker wins a five-year supply contract paid in a currency it does not otherwise hold. Rather than borrow in that currency at an unattractive rate as an unknown name, it borrows at home and enters a currency swap that converts its debt service into the contract currency.
Example
A mid-sized bank funds itself with domestic deposits but lends to shipping clients in dollars. It uses cross-currency swaps to convert domestic currency funding into dollar funding so that its assets and liabilities are matched by currency.
Example
An airline buys aircraft priced and financed in dollars while earning almost all its revenue in its home currency. A long-dated currency swap turns the dollar lease obligations into fixed home currency payments, which makes the fleet plan far easier to budget.
Formula
Calculation
Annual net cash flow to a party = interest received on the currency lent - interest paid on the currency borrowed, with principal re-exchanged at maturity at the original agreed rate.
Worked example. A United States manufacturer needs euros to fund a new European plant, and a European group needs dollars to fund a United States acquisition. The spot rate is 1.20 dollars per euro. The American firm borrows $120,000,000 at home at 5%, and the European firm borrows EUR 100,000,000 at home at 3%. They swap principals, so the American firm receives EUR 100,000,000 and the European firm receives $120,000,000, which balances because EUR 100,000,000 x 1.20 = $120,000,000. Each year the American firm pays EUR 100,000,000 x 0.03 = EUR 3,000,000 to its counterparty and receives $120,000,000 x 0.05 = $6,000,000, which exactly covers the interest on its own dollar loan. At maturity the principals swap back at 1.20 regardless of the spot rate. If the euro had risen to 1.35 by then, buying EUR 100,000,000 in the open market would have cost $135,000,000 rather than the $120,000,000 fixed by the swap, a difference of $15,000,000.Case study
Seen in the real world.
Aldergrove Robotics is an invented company used purely to illustrate how a currency swap works in practice. It was well known to lenders at home, where it could borrow ten-year money at 4.6%, but when it approached banks abroad to fund a new overseas assembly plant it was quoted 6.1% because no one there knew the credit.
Its adviser found a mirror-image counterparty: an overseas group with the opposite problem and the opposite home advantage. The two entered a ten-year fixed-for-fixed currency swap on notional principals worth about $90,000,000, each borrowing at home and passing the proceeds and the interest obligation across.
The illustrative result was that Aldergrove funded the plant at an all-in cost close to its home rate rather than the 6.1% quoted abroad, and its overseas revenue paid the interest naturally. The fictional company also had to post collateral as the swap moved in value, which was a cash management task it had not budgeted for at the outset.
Watch out
Common mistakes.
- Thinking a currency swap is a loan, when it is an exchange of payment obligations between two parties who each keep their own original borrowing.
- Forgetting the re-exchange of principal at maturity, which is where the largest single cash flow in the whole structure sits.
- Ignoring collateral requirements, because a swap that moves against you can demand real cash long before maturity even if the hedge is working as intended.
Questions
People also ask.
How is a currency swap different from a forward contract?
A forward is a single exchange on one future date, while a currency swap runs a stream of interest payments over years and exchanges principal at both the start and the end.
Does a currency swap remove all exchange rate risk?
It removes the risk on the specific cash flows it covers, but any unhedged revenue, costs or assets in that currency remain exposed.
Who typically arranges these deals?
Banks act as intermediaries and often take the other side themselves rather than matching two corporate counterparties directly, which is why the market is far larger than the number of natural mirror-image pairs.
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