Currency conversion fees: the spread, DCC and card charges explained

All monetary examples use hypothetical currency units unless a source amount is quoted. Use one currency throughout each calculation; the percentages in examples are assumed comparison inputs, not quotes from any provider. In particular, the 0.5% example is a teaching assumption.

Paying in another currency usually costs more than the price on the receipt suggests. Part of the cost may appear as a fee. Another part often sits inside the exchange rate itself, where it is easy to miss. This guide explains both parts, the question card terminals ask abroad, and what sending money across borders costs.

The mid-market rate: the benchmark price of money

Currency markets are enormous. The Bank for International Settlements measured average trading of about 9.6 trillion US dollars per day in April 2025. BIS Triennial Survey 2025.

In that market, each currency pair has a price at which dealers buy and a price at which they sell. The midpoint is called the mid-market rate. Online converters may display a mid-market rate, while central banks publish separately constructed reference rates. Their methods and timing can differ. The European Central Bank, for example, publishes daily euro reference rates and notes they are for information only, not a transaction rate. ECB euro reference rates.

Retail customers rarely receive the mid-market rate. A provider between you and the market earns money in two ways:

• A visible fee, such as a fixed charge or a percentage shown on the receipt.
• A margin or spread: an exchange rate slightly worse than the mid-market rate, with the provider keeping the difference.

A fee is printed. A margin is built into the number. That is how an offer can say “zero commission” and still be expensive. BEUC, the European consumer organisation, documented a cash machine screen showing zero commission while the small print revealed a 9.9% margin in the rate. BEUC position paper.

Dynamic currency conversion: the question at the till

When a card terminal or ATM abroad offers to charge you in your home currency, it is offering dynamic currency conversion (DCC). If you accept, the merchant’s or ATM operator’s payment provider converts the amount, at a rate it sets. Mastercard’s merchant rules describe it this way: the account is debited “using the exchange rate offered by the acquirer”. Mastercard DCC guide.

What the measurements found (Europe, older data):

These tests are from 2016–2017. They show a consistent pattern, not today’s exact price at any specific terminal.

Rules (vary by network and region). Mastercard’s 2025 guide says no conversion method may be the default, cardholders must not simply be asked “yes” or “no”, and automatic DCC is not permitted. Visa tells UK customers that merchants and ATMs “must not choose on your behalf”. Visa UK on DCC. Local disclosure rules also vary. Check the current rules for the country and payment type; a displayed markup is not proof that a conversion is good value.

Practical starting point: declining DCC leaves conversion to your card provider. Compare the offered conversion with your card terms; local currency is often cheaper, but it is not a guarantee for every card and transaction.

Your own card’s foreign transaction fee

Paying in local currency avoids DCC, but your card may still add a fee for transactions in another currency. Examples by region:

• United States: the CFPB’s official commentary uses an example of a 1% network charge plus a 2% issuer charge, 3 percentage points in total. This is a regulatory example, not a current market average or cap. CFPB, Regulation Z § 1026.4.
• United Kingdom: check the debit card issuer’s current non-sterling and withdrawal charges, as well as any separate ATM operator charge. Product-specific fees can change. Barclays on using a debit card abroad.
• Canada: the Financial Consumer Agency of Canada uses a 2.5% conversion charge as its example. FCAC on how credit cards work.

Some banks and app-based accounts charge no foreign transaction fee and convert close to a network or mid-market rate. The difference is in the terms, not on the card. Read your card’s fee schedule for purchases and cash withdrawals before travelling. These examples are not recommendations of any provider.

Worked example: one trip, three ways to pay

Assume you spend the equivalent of exactly 2,000 home-currency units abroad, measured at the mid-market rate. All charges are calculated on that amount. ATM operator fees and interest are ignored. Each percentage is an illustrative assumption. This comparison does not quote an available product.

Same trip, same purchases: the cost of converting ranges from 10 to 140 units in this example, and none of it may appear as a line item labelled “fee”. Whether a card fee also applies on top of DCC depends on the card agreement, so do not assume either way.

If you are saving for a trip, set a buffer for these charges in your savings goal plan.

Sending money home: remittance costs

For many families, currency conversion is a monthly cost rather than a holiday expense. The World Bank estimates that remittance flows to low- and middle-income countries reached about 685 billion US dollars in 2024, more than foreign direct investment and official development aid combined. World Bank Blogs, December 2024.

The World Bank’s Remittance Prices Worldwide database measures the total cost of sending 200 US dollars, counting both the fee and the exchange-rate margin. Q3 2025 averages: World Bank RPW, Issue 54

The dollar column is our multiplication of the published percentages. Averages vary widely by corridor; your route may be cheaper or more expensive.

Targets and rules. The UN Sustainable Development Goals and the G20 target an average cost of no more than 3% for a 200-dollar remittance by 2030. The G20 also set a stricter 2027 target of a 1% average for cross-border retail payments. FSB, G20 targets. In October 2025, the Financial Stability Board said satisfactory progress at the global level on the 2027 timetable is unlikely. FSB statement, October 2025.

In the United States, remittance providers must disclose fees, the exchange rate and the amount the recipient will receive before payment. CFPB, Regulation E § 1005.31. Since 1 January 2026, a 1% US remittance transfer tax applies to certain transfers abroad, particularly those funded with cash, money orders or similar instruments; check the IRS guidance for which transfers are covered. IRS, April 2026.

Checklist before you pay or send in another currency

1. At a till or ATM abroad, compare DCC with your card terms. Choosing local currency avoids the merchant or ATM provider’s conversion, but your own card can still charge fees.
2. Before travelling, look up your card’s foreign transaction fee and cash withdrawal fee. If both are high and you travel often, compare alternatives that charge less.
3. Ignore the word “fee” on its own. Compare the total amount debited from your account, or the amount the recipient receives, against the mid-market rate at the same time.
4. If you send money regularly, compare several providers on your corridor. The World Bank data shows average cost differences of several percentage points between provider types.

Currency costs also affect investments held in another currency; see investment fees for how recurring costs compound. To test which money concepts you already know, take the financial literacy test, which includes a question on paying abroad.