Yes, banks convert currency, but they make money when they do

Banks convert one currency into another every day. When you exchange dollars for euros, or a wire transfer arrives from another country, a bank is doing the conversion. But banks do not convert at the rate you see on the news. They add a markup — sometimes a small percentage, sometimes much larger — and keep the difference as profit.

The real exchange rate (called the mid-market rate) is what you would see if you could trade directly with another person at that exact moment. Banks almost never offer you that rate. Instead, they offer you their own rate, which is worse for you. The gap between the mid-market rate and the rate your bank offers is called the spread.

Understanding how this works matters because currency conversion happens in places you might not expect — not just when you ask for it directly, but also when you use a credit card abroad, when you receive money from another country, or when you send money overseas.

Key Takeaways

  • Banks convert currency at a rate worse than the mid-market rate, keeping the difference as profit through what is called a spread.
  • The spread can range from less than 1% at large banks to 5% or more at smaller banks or through certain services.
  • Currency conversion happens automatically when you use a credit card abroad, receive a wire transfer from another country, or exchange cash, even if you do not ask for it.
  • You can reduce what you pay by comparing rates across banks, using specialist money transfer services, or holding foreign currency accounts if you travel or receive money regularly.

Where the markup happens: the spread

When a bank converts your money, it quotes you a price. That price is not the mid-market rate. It is the mid-market rate plus a percentage that the bank keeps. A large bank might add 1% to 2%. A smaller bank or a money transfer service might add 3% to 5% or more.

Here is a concrete example. Suppose the mid-market rate for US dollars to British pounds is 0.79 (meaning one dollar equals 0.79 pounds). A large bank might offer you 0.77 instead. You lose 0.02 per dollar. On $1,000, that is $20 that goes to the bank, not to you or the person receiving the money.

The spread is not always shown as a separate line item. Sometimes it is hidden inside the exchange rate itself. Sometimes it appears as a fee. Either way, you are paying it. The bank's job is to convert currency safely and quickly, and the spread is how they are paid for that service — but it is worth knowing what you are actually paying.

When banks convert currency without you asking

Currency conversion does not only happen when you walk into a bank and ask to exchange money. It happens automatically in several situations, and each one may carry a different markup.

Credit cards used abroad: When you swipe a card in another country, the merchant's bank converts the local currency to your home currency. Your credit card company then adds its own markup on top. You do not see this happen, but you pay for it when the bill arrives. Some credit cards have lower markups than others.

Wire transfers from another country: When someone sends you money from abroad, the sending bank converts it, then the receiving bank converts it again. Each bank takes a spread. You might also see a separate wire fee on top of the conversion cost.

ATM withdrawals abroad: When you withdraw cash from an ATM in another country, the ATM operator's bank converts the amount, and your home bank converts it again. You may also pay an ATM fee. The total cost can be surprisingly high for a small withdrawal.

How much the spread varies between banks

Not all banks charge the same spread. Large banks with many customers and high trading volume can afford to offer tighter spreads — sometimes 1% to 2%. Smaller banks and online-only banks may charge 2% to 4%. Specialist money transfer services vary widely, from less than 1% for large amounts to 5% or more for small transfers or less common currency pairs.

The spread also depends on the currency pair. Converting dollars to euros is common and competitive, so spreads are usually tighter. Converting dollars to a less-traded currency might carry a wider spread because the bank faces more risk and has fewer customers to share the cost across.

If you convert currency regularly — because you travel often, receive money from abroad, or do business internationally — comparing spreads across banks or using a specialist service can save you hundreds of dollars a year. A difference of 2% might seem small, but on $10,000, it is $200.

Fees separate from the spread

The spread is not the only cost. Banks often charge a separate fee for currency conversion or for the transaction itself. A wire transfer might cost $15 to $50 in fees, on top of the spread. An ATM withdrawal might cost $2 to $5, on top of the spread. A currency exchange at a bank branch might cost $10 or more.

These fees are usually shown separately on your statement or receipt, so they are easier to spot than the spread. But they add up, especially if you convert currency often. Always ask what the total cost will be — both the spread and any separate fees — before you commit to a transaction.

Ways to reduce what you pay for currency conversion

If you know you will need another currency, you have options beyond your main bank. Specialist money transfer services like Wise (formerly TransferWise), OFX, or Remitly often offer tighter spreads than banks, especially for international wire transfers. They are designed specifically for moving money across borders and can be much cheaper.

Holding a foreign currency account at your bank can help if you receive money regularly in another currency. Instead of converting every time, you can hold the money in that currency and convert only when you need it, or when the rate is favorable. Some banks offer this; others do not.

Comparing rates before you convert is straightforward and free. Call your bank and ask what rate they would offer for the amount you want to convert. Then check what a specialist service would charge. The difference might surprise you. For large amounts, even a 1% difference is worth the phone call.

Avoiding small conversions also helps. The spread is a percentage, so it costs the same whether you convert $100 or $10,000. But fees are often fixed, so converting $100 might cost you $15 in fees plus the spread, while converting $10,000 might cost the same $15 in fees plus the spread. Larger conversions are more efficient.

What happens when you receive money from abroad

When someone sends you money from another country, the conversion happens twice: once at the sending bank and once at your receiving bank. Each bank takes a spread. You might also pay wire fees. The person sending the money might pay fees too.

If you receive money regularly from abroad — family support, freelance payments, or business income — ask the sender to use a specialist service instead of their bank. Services like Wise or Remitly often cost less than banks for this exact reason. You can also ask your bank what their receiving rate is for the currency you expect, so you know what to expect.

Frequently Asked Questions

Can I get the mid-market rate from a bank?

Rarely. Some banks offer rates very close to mid-market for large transfers or for customers with high account balances, but they almost never offer the exact mid-market rate. Specialist money transfer services sometimes come closer, especially for large amounts or common currency pairs.

Why do banks charge a spread if they also charge fees?

The spread and fees serve different purposes. The spread is the bank's profit on the conversion itself. Fees cover the cost of processing the transaction, maintaining systems, and managing risk. Both are how the bank makes money from currency conversion.

Is the spread the same for cash exchange and wire transfers?

No. Cash exchange at a bank branch often carries a wider spread than a wire transfer, because handling physical cash is more expensive. Wire transfers may have lower spreads but higher separate fees. Always ask for the total cost of both the spread and any fees before you decide which method to use.

What is the best way to send money to another country?

It depends on the amount, the currency pair, and how fast you need it. For large amounts to common destinations, specialist money transfer services usually cost less than banks. For small amounts or urgent transfers, a bank wire might be faster even if it costs more. Compare the total cost — spread plus fees — before you choose.

Do credit card companies charge a spread on foreign purchases?

Yes. Credit card companies add a markup to the mid-market rate, usually 1% to 3%, when you use your card abroad. Some cards have lower markups than others. If you travel frequently, choosing a card with a low foreign exchange markup can save you money.