Currency Conversion Markup

A currency conversion markup is the extra amount a provider builds into the exchange rate it gives a customer, compared with a reference rate such as the mid-market rate or a card network's daily rate. It is the provider's margin for carrying out the currency conversion. Because it is embedded in the rate rather than shown as a separate fee, it is often less visible to customers than an explicit charge.

Markups are applied by banks on international transfers, by card issuers on foreign transactions, by merchants' providers offering dynamic currency conversion, by remittance service providers and by FX brokers. The term overlaps with FX markup and FX spread, though spread more strictly refers to the gap between buy and sell rates.

The markup is usually expressed as a percentage of the reference rate:

This form applies when the rate is quoted as units of the foreign currency the customer receives per unit of home currency. For example, if the mid-market rate is 1.2500 US dollars per pound and a bank gives a customer 1.2125, the markup is $(1.2500 - 1.2125) \div 1.2500 \times 100 = 3\%$. On a conversion of 1,000 pounds, the customer receives 1,212.50 dollars instead of 1,250, a hidden cost of 37.50 dollars.

When the rate is quoted the other way round, as home currency paid per unit of foreign currency, the customer rate is higher than the reference and the formula is reversed accordingly.

• Card payments abroad. Card networks convert at their own rates, which are close to wholesale. Issuers may add a separate foreign transaction fee, and some build a margin into the rate as well.
• Dynamic currency conversion. When a merchant offers to charge a foreign card in the cardholder's home currency, the provider sets the rate, often with a markup well above the issuer's charges. The merchant may receive a share.
• International transfers. Banks commonly convert at a rate including a margin, and the margin may be larger for small transfers or less common currencies.
• Remittances and fintech. Providers advertising low or zero fees frequently earn most of their revenue from the conversion markup.
• ATMs abroad. Foreign ATMs may offer to convert the withdrawal into the card's currency at a rate with a markup.

Markups tend to be larger for currencies that are less traded, for small amounts, for cash and for conversions outside market hours, when providers face greater risk of rate movements. Competition matters: corridors with many providers usually have lower margins. Business customers with large volumes can negotiate margins close to wholesale, while retail customers often accept the default rate. Some providers also adjust the markup by customer segment or channel.

Regulators have pushed for clearer disclosure. In the European Union, Regulation (EU) 2019/518, amending the cross-border payments regulation, requires providers to express currency conversion charges for card payments and ATM withdrawals as a percentage mark-up over the latest euro foreign exchange reference rates issued by the European Central Bank, and to send customers an electronic message showing the mark-up after a card payment in another EU currency. Similar transparency is required for dynamic currency conversion offers. In the United States, remittance transfer rules require disclosure of the exchange rate used and the amount the recipient will receive. Other jurisdictions apply general fair-pricing and disclosure rules to FX services.

Customers can compare the rate offered with a public exchange rate source showing the mid-market rate to see the markup. Choosing to pay in the local currency rather than accepting dynamic currency conversion, using cards without foreign transaction fees, and using specialist transfer providers that disclose their margin usually lowers costs. Businesses can negotiate margins, use forward contracts to fix rates and hold foreign currency balances so that conversion happens less often.

Consumer groups argue that markups are a hidden fee that makes it hard to compare offers, especially when a provider advertises "no fees". Providers point out that conversion involves costs, including liquidity, risk and operations, and that the markup is a legitimate way to cover them. The movement towards percentage-based disclosure, similar to the price transparency sought for cross-border fees, aims to give customers a single figure to compare, but awareness remains limited, and many customers still focus on headline fees rather than the total cost of conversion.