Always choose local currency? The card terminal trick that can cost you 5% more

You are in Prague.

Dinner costs:

You tap your card.

The terminal suddenly asks:

The euro option feels safer.

You immediately understand the amount.

No mental conversion.

No uncertainty about what your bank will charge later.

So you press:

EUR

And that small decision may make the dinner more expensive.

What the terminal is offering is usually Dynamic Currency Conversion, or DCC.

Instead of letting your bank or card network convert the purchase later, the merchant’s payment provider converts it immediately into your card’s home currency.

Convenient?

Yes.

Usually cheaper?

Not necessarily.

Visa currently warns that DCC may include an exchange-rate markup and additional fees, and separately notes that using DCC while travelling can often mean roughly a 3–5% markup through the exchange rate.

That means one button on a payment terminal can turn a €1,000 holiday spend into an additional €30–€50.

Without buying anything extra.

What actually happens when you choose local currency?

Suppose you are in Hungary and the restaurant bill is:

You choose:

The merchant sends the transaction in Hungarian forints.

Your card issuer then converts it into the currency of your account according to the applicable card-network or bank terms.

Mastercard, for example, provides its own currency-conversion calculator and notes that the relevant conversion can depend on when the transaction is authorized or processed, together with any fee charged by your issuing bank.

Your statement might eventually show something like:

The important point is:

The merchant did not perform the currency conversion.

Your own payment chain did.

What happens when you choose your home currency?

Now choose:

instead.

The merchant or its payment provider performs the conversion before sending the transaction.

You have accepted DCC.

Mastercard explicitly notes that when a transaction is converted by the merchant or ATM operator — commonly when you choose your card’s currency instead of the merchant’s — Mastercard’s own currency-conversion rate does not apply.

So the choice is not merely:

It is more accurately:

And those rates may be very different.

When travelling abroad and a terminal asks:

our default rule is:

Choose the local currency.

Examples:

In Croatia:

In Albania:

In Serbia:

In Turkey:

In the UK:

In Switzerland:

The principle is simple:

Pay the merchant in the currency in which the merchant normally prices the purchase.

Then allow your own card issuer/payment network to handle the conversion.

There are exceptions, which we will get to.

But this is the safer default.

DCC is psychologically clever.

Imagine the terminal displays:

You may have no immediate intuition whether that is:

Then the terminal offers:

Suddenly everything feels clear.

The home-currency number removes uncertainty.

But clarity is not the same as value.

You are effectively being offered:

“Would you like us to calculate the exchange rate for you?”

The correct response is:

“At what rate?”

Visa requires DCC merchants and ATMs to disclose the exchange rate, the local and home-currency amounts and applicable markup or fees, and says the cardholder must be allowed to accept or decline the conversion.

The EU also requires providers offering point-of-sale currency conversion to disclose the conversion markup and show both the merchant-currency and payer-currency amounts before the transaction begins.

So the information may be there.

The problem is that most travellers do not stop to calculate it.

Suppose DCC costs 4% more than the alternative conversion.

Your trip spending:

Extra cost:

Nothing dramatic happened.

No scam notification.

No giant fee appeared.

You simply paid:

more for the same trip.

At 5%:

For a family spending €3,000 abroad:

That is why small exchange-rate differences deserve attention.

You may see wording such as:

or:

or:

Those statements can be technically true.

DCC can tell you exactly how many euros will hit your card for that transaction.

But you are paying for that certainty through the offered conversion rate if it is worse than your alternative.

The question is not:

Is the rate guaranteed?

The question is:

Is the guaranteed rate good?

Terminals are not always intuitive.

You may see:

instead of:

The option labelled:

can actually be the one you want because it leaves the transaction in local currency.

Always identify the currency itself.

Do not rely only on button wording.

Good

Usually avoid

when your home account is denominated in euros.

This is the major caveat.

Suppose your card issuer charges:

for foreign-currency purchases.

And the DCC markup is:

In that particular transaction, DCC could theoretically be competitive or even cheaper.

That is why the rule is not mathematically:

Local currency always wins.

It is:

Local currency is usually the best starting choice unless you know your own card’s FX costs and can prove the offered conversion is better.

You need to know:

versus:

Most travellers cannot calculate that accurately while a waiter is holding the terminal.

Hence the practical default:

Frequent travellers can make this easier.

Use:

Card A — Travel card

Use this abroad in:

Card B — Backup card

Keep it separately for:

• declined transactions
• lost cards
• offline terminals
• emergencies

Now you no longer need to perform a currency calculation every time you pay for coffee.

The operating rule becomes:

Suppose you are Macedonian but your card account is in euros.

You are shopping in Serbia.

Terminal asks:

The relevant comparison is based on your card/account currency and its conversion terms, not your passport.

Likewise, someone living in Germany might use:

• a euro account
• a dollar card
• a multicurrency wallet

The correct answer depends on the funding currency and card terms.

Suppose your fintech account holds:

and you pay in Switzerland.

If you already hold Swiss francs or your provider offers a competitive CHF conversion, selecting:

at the terminal gives your own provider the chance to settle according to your account setup.

If you instead choose:

through DCC, the merchant’s conversion occurs first.

Your sophisticated multicurrency setup may never get a chance to do the thing you opened it for.

After payment, inspect the receipt.

A DCC receipt may display:

EU rules require currency-conversion providers in scope to disclose the markup over the relevant reference rate, while Visa rules require disclosure of the conversion details and active cardholder choice.

If you intended to pay in local currency but your receipt shows the purchase was converted into your home currency, act quickly.

Visa says merchants must give cardholders the opportunity to pay in local currency, and customers should contact their issuer if a transaction was converted without permission.

You say:

Card, please.

The waiter takes your card.

The terminal returns already processed in euros.

That should not happen without your choice.

Visa explicitly states that merchants or ATMs offering DCC should not select the conversion on behalf of the cardholder.

A simple sentence solves most situations:

Please charge me in local currency.

Use it before the card is tapped.

In Turkey:

Turkish lira, please.

In Poland:

Polish zloty, please.

In Hungary:

Forints, please.

You do not need to explain DCC theory at the restaurant.

A bad conversion on coffee costs cents.

A bad conversion on a hotel can cost serious money.

Hotel bill:

DCC disadvantage:

Cost:

At 5%:

The same applies to:

• rental cars
• medical bills
• jewellery
• electronics
• luxury shopping
• large deposits

The larger the purchase, the more important the currency button becomes.

Hotels and rental-car companies often place deposits or holds.

Ask which currency will be used for:

because the temporary hold may also interact with currency conversion and your available balance.

Do not focus exclusively on the final invoice while ignoring a large deposit.

DCC is not limited to physical terminals.

An international website may offer:

instead of the merchant’s original currency.

This may be convenient.

But once again, ask:

Who is performing the conversion?

Visa’s merchant guidance recommends transparent currency disclosure and an easy way for customers to switch back to the merchant’s local currency when currency-conversion services are offered.

So when buying internationally online, compare:

with:

before paying.

You do not need to memorize exchange rates.

Suppose the terminal offers:

Your phone indicates roughly:

Difference:

Percentage difference:

Now the convenience has a visible price.

You can make the decision in seconds.

For a tiny transaction:

even a 5% disadvantage is:

Do not ruin your holiday performing forensic accounting over every espresso.

But once a transaction exceeds:

pay attention.

At €100:

At €500:

At €2,000:

The larger the transaction, the less excusable an unnecessary conversion becomes.

Before the trip:

Restaurant

Please charge the card in local currency.

Hotel

Please process the payment in local currency, without currency conversion.

If the terminal has already converted it

Please cancel that transaction and charge it again in local currency.

Short.

Clear.

No banking lecture necessary.

When a card terminal abroad asks whether you want to pay in your own currency, it is not simply translating the number for you.

It may be offering a separate currency-conversion service.

Visa says DCC can include additional fees and markup, and its current consumer guidance notes that the convenience can often carry a roughly 3–5% markup.

So the default Fintayo rule is simple:

When abroad, pay in the merchant’s local currency and let your own card issuer handle the conversion.

Not because local currency is mathematically guaranteed to win every single transaction.

But because accepting DCC means giving the merchant’s payment provider control of the exchange rate.

And unless you have compared both conversion costs, that is usually a bet you do not need to make.

The expensive button is often the one designed to look most convenient.