Card exchange rates

How conversion works when paying by card When you pay by card in another currency, the bank converts the amount to debit your account. The process includes the payment network's rate, possible bank mark-ups and the time delay from the moment of purchase to the moment of settlement. This means the amount on the receipt may differ from the one on your statement because the final conversion happens later and under different rules. That is why it is useful to understand the general mechanism rather than expect a fixed number. The role of payment networks Visa and Mastercard Payment networks set a reference exchange rate for transactions and determine the base rate at the time of the transaction. The issuing bank uses this rate as a basis but may add its own fee or apply its own conversion rules. The process runs through several stages across banks and processing centres, so the final amount is determined when the transaction is actually processed. This explains the difference between the expected amount and what you see on the statement. How rates differ and when you see them The network rate may be applied at authorisation, while the bank might recalculate the amount later. Such timing mismatches affect the final debit. Rates can also depend on market opening hours and the moment of exchange between the relevant currencies. Therefore, transactions at night or on weekends can show a different final amount after processing. Why the debited amount differs from the expected one Differences arise because of varying rates, time lags and additional fees at the bank or processing level. Often a payment is authorised at one rate, but the final debit occurs at another rate at clearing. Terminals and online platforms may also offer to convert at their own rate when they present payment in a different currency. This option alters the outcome and can make the payment more expensive than expected. What double conversion is Double conversion happens when a transaction is first converted into an intermediate currency and then into the currency required by the bank or payment network. This creates two exchange steps and two possible margins. The result can be unfavourable because each step uses its own rate and may include additional charges. It often occurs with currencies that are not widely traded on international markets. How to tell if a double conversion occurred The statement or transaction details sometimes indicate an intermediate currency or multiple entries for the same purchase. This suggests an extra conversion step. If the debited amount is significantly different from expected, check the authorisation currency and the final debit currency to understand the conversion chain. How to minimise surprises in costs First rule: check which currency the payment will be debited in and choose the local currency if you want to avoid extra conversions. This is general advice and not a recommendation of specific services or banks. It is also useful to monitor transaction details in the mobile app and keep receipts. Understanding the mechanism helps anticipate possible statement discrepancies and reduces surprise at the final amount.