Spending abroad on a card is one of those things that feels free and is not. The exchange happens invisibly, the charges are folded into a figure on a statement you read a fortnight later, and by then it is very hard to work out what you actually paid for. This guide explains what is going on underneath, and how a multi-currency account like Wise differs structurally from a high-street bank card.
We do not publish rates or charges here, because they vary by provider, account type, and currency, and they change. What does not change is the shape of the thing, and the shape is what determines whether you are getting a fair deal.
Three separate charges, not one
The most useful thing to understand is that spending abroad on a typical high-street debit or credit card can involve three distinct charges, applied independently. People tend to think of it as a single cost, which is why the total is often a surprise.
The exchange rate itself. Your bank does not convert at the mid-market rate, which is the rate you see quoted on financial sites and search engines. It converts at its own rate, which is set a little away from the mid-market rate in the bank's favour. This is a margin built into the rate rather than a line item, so it does not appear as a charge anywhere on your statement. It is invisible by design.
A foreign transaction charge. Many standard accounts apply a separate charge, calculated as a percentage of the transaction, whenever you spend in a currency other than your account currency. This one usually is itemised, or bundled into the converted amount.
Cash withdrawal charges. Taking cash out at a foreign ATM can attract a charge from your own bank, and separately a charge from the machine's operator, on top of whatever rate is applied to the conversion.
The three stack. That is the mechanism, and it is why a small percentage figure quoted in an account's terms understates what a fortnight of ordinary holiday spending actually costs.
How a multi-currency account differs
Wise works on a different model, and the difference is structural rather than promotional.
Instead of converting at the point of sale on a rate the provider sets, you hold balances in multiple currencies and convert between them deliberately, as a distinct action, at the mid-market rate with a stated conversion charge. Two things follow from that.
First, the charge is visible. You see the rate, you see what the conversion costs, and you see the result before you confirm it. Whether it works out cheaper in your case is something you can check in advance rather than reconstruct afterwards.
Second, conversion and spending come apart. If you convert to euros before a trip, subsequent spending in euros is drawing down a euro balance rather than triggering a fresh conversion each time you tap. If you do not hold the currency, it converts automatically at the point of spending instead.
The card also holds several currencies at once, which matters more on multi-country trips than single-destination ones. A route through several Schengen countries uses one euro balance. A route through Czechia, Poland, and Hungary uses three different currencies, none of which is the euro.
When the difference actually matters
Being honest about this: for one short trip a year with modest card spending, the difference is unlikely to change your life, and the effort of setting up another account may not appeal.
It starts to matter when any of the following apply.
- You travel internationally more than once or twice a year.
- You are taking a long trip, so the total foreign spend is large.
- Your route crosses several currency zones rather than one.
- You are paid in one currency and spend in another, or send money across borders regularly.
- You want to be able to see what conversion costs rather than infer it.
The last point is the one people underrate. Transparency has value on its own, independent of whether a given transaction is cheaper.
Dynamic currency conversion: the charge you control
There is one charge that has nothing to do with which card you carry, and it is entirely within your control.
When you pay by card abroad, the terminal may offer to charge you in your home currency rather than the local one. It presents this as a convenience, and it looks reassuring, because you see a familiar currency symbol. This is dynamic currency conversion, and accepting it hands the conversion to the terminal operator at a rate they choose, which is reliably worse than what your card provider would have applied.
Always choose the local currency. Always. This applies at card terminals and at ATMs, whatever card you are using, and it is the single easiest saving available to any traveller.
Practical points before you go
Whichever route you take, a few things hold generally.
Set up any new account well before departure rather than at the airport, since verification takes time and a physical card arrives by post. Carry a backup payment method held separately from your main one. Tell your existing bank your travel plans if it requires that, since some still block foreign transactions otherwise. And check whether your destination is a card economy or a cash one, because the answer varies enormously and it changes what you should carry.
Our guide to using Wise abroad covers the practical setup, and the travel money checklist covers the wider pre-departure picture. If you want to check what a currency pair is doing before you convert, our currency converter uses mid-market rates.
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Frequently asked questions
Is Wise cheaper than my bank for spending abroad?
Often, but it depends on your bank, your account type, the currencies involved, and how you use it. The structural difference is that Wise converts at the mid-market rate with a stated conversion charge, while a typical high-street card builds an undisclosed margin into the rate and may add a separate foreign transaction charge on top. Compare your own account's terms against a live conversion quote rather than assuming either way.
What is the mid-market rate?
It is the midpoint between the buy and sell rates for a currency pair on the global market, and it is the rate you see quoted on financial sites. It is the reference point everything else is measured against. Most high-street banks do not give you this rate.
What is dynamic currency conversion and should I accept it?
It is when a foreign card terminal or ATM offers to charge you in your home currency instead of the local one. Decline it every time. The terminal operator sets the rate, and it is consistently worse than the one your own card provider would use.
Should I convert my money before travelling or as I spend?
Both work. Converting in advance fixes the rate before you go and means your spending draws down an existing balance. Converting as you spend takes whatever the rate is at that moment. Many travellers convert part ahead and let the rest happen automatically.
Do I still need cash when travelling?
It depends heavily on the destination. Some countries are almost entirely card-based, while others rely on cash for transport, markets, and smaller businesses. Check your specific destination rather than generalising from your last trip.
Can I use Wise everywhere?
The card works in most places that accept cards, and the account holds a wide range of currencies. Check the current list of supported currencies and any regional restrictions in the app before you rely on it as your only method.
Will my bank block my card abroad?
Some banks still do if they were not told about the trip. Check whether yours requires a travel notification, and carry a second payment method regardless.
Is a credit card or a debit card better abroad?
They serve different purposes. Credit cards often carry stronger purchase protection, which matters for bookings, while debit cards drawn on a multi-currency balance are usually the cleaner option for day-to-day spending. Carrying one of each, stored separately, is a reasonable approach.
What happens if I lose my card while travelling?
With most app-based accounts you can freeze the card immediately from your phone and order a replacement. This is a strong argument for having mobile data that works from the moment you land rather than depending on finding wifi.
Does any of this affect my visa or entry requirements?
No. Payment methods and entry requirements are separate. Some countries do ask arriving visitors to show they have means of support, but that is about evidence of funds rather than which card you carry. Check the entry page for your destination and passport for what applies to you.