An exchange rate is the value of one currency in terms of another, quoted as the amount of one currency needed to buy a unit of the other. It is the price that sits behind every currency conversion, import, export and foreign investment. For most major currencies the rate floats, meaning it changes moment to moment as markets trade; some countries instead peg their currency to another or to a basket, holding the rate fixed or within a band. The exchange rate is the number; the transaction that uses it is currency exchange.
Exchange Rate
An exchange rate is the price of one currency expressed in another, for example how many U.S. dollars it takes to buy one euro. It is the number that governs every cross-border conversion, payment and investment, and it moves constantly for freely traded currencies.
Last reviewed by Steven Fox, CFP®, EA
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Quick Summary
- An exchange rate is the price at which one currency converts into another; it is the rate, whereas currency exchange is the act of converting.
- A floating rate moves continuously with supply and demand; a pegged or fixed rate is held by a government or central bank at a set level.
- The spot rate is the price for immediate conversion; a forward rate locks in a price for a future date.
- For U.S. tax, foreign income and transactions are translated to dollars using the exchange rate on the transaction date, or an official yearly average rate where allowed.
- Exchange-rate movements are a source of return and risk for anyone holding foreign investments, separate from the investment's own performance.
Definition
Advanced Explanation
Exchange rates come in a few forms worth distinguishing. A floating rate, used by the dollar, euro, yen and pound, is set by supply and demand in the global currency market and moves continuously; it is driven by interest rates, inflation, trade balances and expectations. A fixed or pegged rate is one a government or central bank maintains at a chosen level, buying and selling its own currency to defend the peg. Rates are also quoted for different timing: the spot rate is the price for conversion now, while a forward rate is agreed today for a conversion on a future date, which businesses use to lock in the cost of a payment they will make later. Consumers almost never receive the raw market rate; they get it after a provider's spread, which is the subject of currency exchange.
For U.S. taxpayers, the exchange rate is a translation tool. The tax system runs in dollars, so foreign income, foreign taxes paid, and transactions in another currency must be converted to dollars. The general rule is to use the exchange rate in effect on the date of the transaction or receipt (the spot rate). For income received evenly through the year, the IRS accepts a yearly average exchange rate, and it publishes such average rates for this purpose; there is no single official government rate a taxpayer must use, so consistency and a reasonable, verifiable source matter. This is why anyone with foreign wages, a foreign pension, or a foreign account needs to record the rate they used.
For investors, the exchange rate is a distinct layer of return and risk. A U.S. investor who buys a foreign stock or bond earns two things: the asset's performance in its local currency, and the change in the exchange rate between that currency and the dollar. If the foreign currency strengthens against the dollar, it adds to the dollar return; if it weakens, it subtracts, even if the underlying asset did well. This currency risk is why some international funds are offered in currency-hedged versions that strip the exchange-rate effect out, leaving only the asset's local-currency performance.
How to Remember
The exchange rate is the price tag on a currency, read it as "how many of mine buys one of theirs." It floats with the market unless a government pins it, and for a foreign investment it is a second engine of gain or loss riding alongside the asset itself.
Used in a Sentence
“When the exchange rate moved from 1.10 to 1.20 dollars per euro over the year, Diego's European index fund gained in dollar terms even though the fund's price in euros had barely changed.”
How It Works
Suppose an investor holds 10,000 euros of a European fund. At the start of the year the exchange rate is 1.10 dollars per euro, so the position is worth $11,000. Over the year the fund's value in euros stays flat at 10,000 euros, but the euro strengthens to 1.20 dollars. Converted back, the position is now worth $12,000, a $1,000 gain that came entirely from the exchange rate, not the fund.
Had the euro instead weakened to 1.00 dollar, the same flat fund would be worth only $10,000, a $1,000 loss from currency alone. For tax reporting, if this investor received a 500-euro dividend on a specific date, they would translate it to dollars at that day's spot rate, or use the IRS yearly average rate where permitted for income spread across the year. These figures are illustrative; the point is that the exchange rate is a separate source of gain and loss.
Pros and Cons
Pros
- The exchange rate is a transparent, observable price, so the true cost of a conversion can always be measured against the mid-market rate.
- A forward rate lets a business or traveler lock in a future conversion price and remove uncertainty.
- Currency movements can add to the return on foreign investments when the foreign currency strengthens against the dollar.
Cons
- Floating rates move constantly and unpredictably, creating currency risk on foreign income and investments.
- A favorable move can reverse, so currency gains on foreign assets are not dependable.
- Tax reporting requires translating foreign amounts at the right rate and keeping records, an easy step to overlook.
- A pegged rate can break suddenly if a government can no longer defend it, causing a sharp repricing.
People Also Asked
Answers to the most frequently asked questions.
What is the difference between an exchange rate and currency exchange?
The exchange rate is the price, how many units of one currency it takes to buy another. Currency exchange is the act of converting money at that price. When you swap dollars for euros at a bank, currency exchange is the transaction and the exchange rate is the number that determines how many euros you get.
What is the difference between a floating and a fixed exchange rate?
A floating rate is set by supply and demand in the currency market and moves continuously, as with the dollar, euro and yen. A fixed or pegged rate is held by a government or central bank at a chosen level, which it defends by buying and selling its own currency. A peg can break if the country can no longer maintain it.
Which exchange rate do I use for U.S. taxes?
Generally the spot rate on the date of the transaction or receipt. For income received evenly through the year, the IRS accepts a yearly average exchange rate and publishes such rates for the purpose. There is no single mandatory government rate, so use a reasonable, consistent and verifiable source and keep a record of it.
How does the exchange rate affect foreign investments?
It adds a second layer of return and risk on top of the asset's own performance. A U.S. investor in a foreign asset gains when the foreign currency strengthens against the dollar and loses when it weakens, even if the asset itself is flat. Currency-hedged funds exist to remove this exchange-rate effect.
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