Not every foreign payment costs the same. The bank rate, spread, fee, or DCC can all shape currency conversion before you even notice.
Before you pay by card, withdraw cash, or send a transfer abroad, it's worth checking who converts the currency and on what terms.
What Is Currency Conversion?
Currency conversion means changing money from one currency into another, say your home currency into EUR, EUR into GBP, or CHF into your home currency.
This happens whenever the currency of a payment differs from the currency of the account behind it. If a card is linked only to a home-currency account and a shop charges 100 EUR, the bank or provider has to convert that amount into your home currency.
When Does It Happen?
This can happen during:
- a card payment in a foreign currency;
- a purchase from a foreign online store;
- a cash withdrawal abroad;
- an international transfer;
- an exchange at a bank, bureau, or app;
- a fee charged in a currency other than your account currency.
Say you pay 60 EUR for dinner in France. If your card draws on a home-currency account, the bank converts the euros and takes the matching amount from that account. If you hold a currency account in EUR with enough balance, the transaction can settle without any further conversion.
So what matters isn't just the country you're paying in, but the currency of the account behind the card and the rules of that specific card.
How Is the Cost Calculated?
This cost doesn't always show up as one visible fee. It can be made up of:
- the rate applied by the bank, fintech, or card network;
- the currency spread;
- a currency conversion fee;
- a foreign transaction fee;
- an ATM withdrawal fee;
- a margin built into DCC.
Say a purchase costs 100 EUR, and your home currency isn't the euro. At a rate of 1.08, that should mean a charge of 108 in your home currency. If the bank applies a rate of 1.09 instead, the cost rises to 109. Add a 3% commission on top, and you'd pay around 112.
The difference isn't only about rate changes. The settlement rules a bank or card provider applies also play a part.
What Affects the Exchange Rate?
Exchange rates move with market conditions. Interest rates, inflation, economic data, central bank decisions, political events, and demand for a given currency all play a role.
The mid-market rate can serve as a reference point, but it usually isn't exactly the rate a bank, bureau, Visa, Mastercard, or the operator of an app will apply.
The moment a transaction settles matters too. Authorisation can happen on one day and settlement later, once the exchange rate has already moved. The amount shown right after paying may not be the final figure yet.
What Is a Currency Spread?
A currency spread is the gap between the buy rate and the sell rate for a given currency.
If a bank buys foreign currency at 1.05 and sells it at 1.09, the spread is 0.04. When you exchange your home currency for that foreign currency, the sell rate applies; converting back the other way, the buy rate applies.
The wider the gap between these two rates, the more expensive the exchange. That's why "no commission" doesn't always mean no cost: a provider might skip a separate fee but build an exchange rate margin into the rate instead.
It's better to compare the final converted amount than the headline commission percentage on its own.
What Is Dynamic Currency Conversion?
Dynamic Currency Conversion, or DCC, is a service offered by a payment terminal or an ATM. It lets you settle a transaction in your card's currency instead of the local one.
An ATM abroad might ask, for instance, whether a withdrawal should be settled as:
- the local-currency amount;
- an equivalent amount in your card's currency.
Choosing your card's currency means agreeing to DCC. The rate is then set by the operator of the ATM or terminal, or whoever provides that service to them, and it usually carries an extra margin.
Seeing an amount in your own currency straight away can feel convenient, but that convenience doesn't mean a good rate. When paying or withdrawing cash abroad, it's usually better to choose the local currency and let your own bank or card provider handle the conversion.
How Do You Cut These Fees with ZEN.COM?
The first rule is paying in the local currency. Choose EUR in the eurozone, GBP in the UK, and CHF in Switzerland. If a terminal or ATM offers to settle in your home currency, decline DCC.
For frequent travel, a multi-currency account can be more convenient than juggling separate accounts. ZEN.COM's multi-currency account lets you hold and exchange funds in 35 currencies, including EUR, USD, GBP, and CHF, in one app. You see the rate and the final amount before confirming, so it's easier to judge what the conversion will actually cost.
This kind of setup suits travel, shopping at foreign stores, and international payments. If you already hold funds in the transaction currency, a card can draw on the matching balance without converting from your home currency at all.
Before withdrawing cash, check the ATM operator's own fee too. It can apply on top of anything ZEN.COM or another card provider charges. If it shows up before you confirm the withdrawal, you can cancel and try a different machine.
Does Every Card Convert Payments the Same Way?
No. How a payment settles depends on the bank, the type of card, the account currency, and that provider's own terms.
Card transactions can be converted:
- directly from the purchase currency into your home currency;
- through an intermediate currency;
- at a Visa or Mastercard rate;
- according to the bank's own rate table;
- with an added commission;
- through DCC at the terminal operator's rate.
A multi-currency card can draw funds directly from a balance in EUR, USD, or GBP. Without enough money in the matching account, the system might fall back to your home currency, use a different currency it holds, or decline the payment.
Wise, Revolut, banks, and other providers each set their own rules, limits, and fees. Before a larger transaction, check the current pricing, especially weekend exchange terms, cash withdrawal costs, and how funds are drawn from each balance.
How Do You Check What a Conversion Costs?
Start by opening the transaction details and checking:
- the amount in the foreign currency;
- the amount taken from your account;
- the exchange rate applied;
- whether DCC was used;
- any of the fees listed above.
You can work out the effective exchange rate by dividing the amount charged in your home currency by the transaction's value in the foreign currency.
If a 100 GBP purchase was charged as 122 in your home currency, the effective exchange rate was 1.22 per GBP. Compare that against the reference rate from the same day, and the difference shows what the spread and conversion fees actually cost.
It's also worth remembering that several costs can apply at once. A bank might apply its own rate and add a commission, while the ATM operator charges a separate withdrawal fee on top.
What Does This Mean in Practice?
Currency conversion isn't a penalty or a hidden commission in itself. It's an ordinary process, needed whenever one transaction involves two different currencies. The cost, though, depends on who does the converting, which rate they use, and which fees they add.
The moment a transaction settles and that specific provider's own rules matter just as much as the currency itself. Two people paying the same amount can end up charged differently if their banks apply different rates or commissions.
Before you pay, withdraw cash, or send a transfer, check the account currency, the exchange rate, the spread, and any extra fees that might apply. The final amount is always the most reliable figure. That's what shows what changing one currency into another actually cost.
