Should I accept dynamic currency conversion abroad?

At a glance#

What the terminal is offering#

A card payment abroad involves two currencies and therefore one conversion. The question is only who performs it. Left alone, the card network converts at settlement using its own published rate, and that rate sits close to the interbank rate.

Dynamic currency conversion moves that step forward and hands it to somebody else. A provider contracted by the acceptance point converts at the moment of payment, at a rate it sets itself, and passes the card network an amount already expressed in your home currency. The network no longer converts anything, because there is nothing left to convert.

The difference between the two rates is the markup, and it is shared between the provider and the merchant. Nobody is hiding a fee line, because there is no fee line; the cost is inside the price, which makes the offer both effective and hard to notice. It is a priced convenience that is sold badly, and the price sits in the one number a traveller cannot check at the counter.

How the markup stays invisible#

A rate is not read like a fee#

A charge printed as a percentage on its own line invites comparison. The same amount expressed as an exchange rate does not, because almost nobody carries a reference rate in their head. A terminal showing a rate is showing a number that cannot be judged on the spot.

The asymmetry is the entire design. The screen displays a converted total, it looks precise, and the only way to check it is to compare against a published rate afterwards, when the decision is no longer open. The size of the markup is set by the conversion provider. In the EU it has to be shown before the payment as a percentage over the ECB reference rate, so the only reliable figure is the one on the screen in front of you.

The presentation does the rest#

Terminals highlight the home currency in several ways: a larger button, colour, a preselection that only needs confirming, or wording that frames the local currency as the unusual choice. None of that is accidental.

Staff often press the button themselves, and rarely out of malice. In many places the device asks a question whose consequence nobody explained to the person holding it, and the fastest path through the screen is the one that gets chosen.

A sentence defends better than vigilance: ask to be billed in the local currency, and check the receipt before signing. Two amounts in two currencies on a receipt mean the conversion happened, whatever was pressed.

The double charge people expect to avoid#

A persistent belief holds that paying in your home currency turns the payment into a domestic one and therefore avoids the foreign transaction fee. It usually does not. Whether that fee applies is set by your card terms, and many issuers key it to the country of the acceptance point or to the underlying currency, whatever currency is displayed.

Where that is the case the fee applies on top of the markup, and on the already inflated amount. The two costs stack, the opposite of what the offer implies. What the fee is and where it applies is set out in what a foreign transaction fee is.

Avoiding that fee takes a card without it. The currency chosen at a terminal changes nothing about it.

Worked example: one hotel bill, two choices#

The example uses a hotel bill of 400 units in the local currency, an interbank rate of 1.17, a card with a 1.75 percent foreign transaction fee and a conversion markup of 6 percent. All four are illustrative values, not measurements.

In the left-hand column the network converts 400 at 1.17 and arrives at 468.00. In the right-hand column the provider adds its 6 percent to the rate, which becomes 1.2402, and the same bill turns into 496.08 before the card fee is applied. The difference is 28.57 on a single hotel bill, for no service in return. The second column is not wrong in any legal sense; it is simply a worse rate that arrives dressed as convenience.

Two details in that table matter beyond the arithmetic. The fee appears in both columns, which disposes of the domestic payment idea. And it is charged on the higher base in the right-hand column, so the markup costs slightly more than the markup itself.

Where the offer turns up#

At the card terminal in a shop. The classic case. Two amounts appear, one is highlighted, and the decision takes a second.

At a cash machine. The most expensive variant, because three costs can meet on one transaction: the conversion markup, the operator’s fee and your own bank’s charge. Only the first is avoided with one button press, which is why the cheapest way to get cash abroad treats the machine as its own case.

Online and at check-out. Booking sites and airline pages offer the same conversion whenever the display currency differs from the currency in which the service is charged. The wording is friendlier and the mechanism identical.

At hotel check-out. Larger amounts, a terminal at a desk, and an unfamiliar sequence of screens. This is where the largest single differences appear on a normal trip, and where the final bill often carries charges that were not in the booking price either, as resort fees and other hotel charges describes.

At a car rental desk. The deposit is authorised and released later, sometimes at a different rate. Billing both steps in the local currency keeps them inside one system, which matters more than the amounts suggest.

At a restaurant with a group bill. One large amount, one terminal, and a queue behind you. It is the classic case of pressing whatever ends the interaction fastest.

When it is not worth the attention#

In some situations the choice is not worth thinking about:

• Small amounts. On a coffee or a bus ticket the difference is cents, too little to spend attention on.
• A card that converts poorly anyway. If your own card applies a wide spread on foreign currency, the gap between the two options narrows. The card is the problem there, and the button cannot solve it.
• No foreign spending in the year ahead. The effect scales with turnover. Somebody who pays abroad twice a year saves an amount that does not justify a system.

One exception runs in the other direction. The network rate applies at settlement, one to three days later. If the currency moves against you by more than the markup in that window, the home currency would have been cheaper in hindsight. It cannot be predicted, and on average the calculation runs the other way. A rule of thumb is not a law of nature, and saying so costs nothing.

What the receipt shows and why it matters#

The receipt is the only document that records which currency was used and at what rate, and it is worth two seconds of attention before it goes in a pocket.

Two amounts. A receipt showing the same purchase in two currencies proves the conversion happened inside the terminal, whatever was pressed on the screen.

A printed rate. Where a rate appears on the slip, it came from the conversion provider. The card network never prints its rate on a terminal receipt, because that rate is not fixed until settlement.

A slip with a single amount in the local currency and no rate on it is the outcome to look for.

A consent line. Many terminals print a sentence stating that the cardholder was offered a choice and accepted the home currency. That line is what makes a later dispute hard, and it is also what makes a dispute possible where the choice was never offered.

Keeping the slip costs nothing and turns an impression into evidence. Without it, a complaint rests on memory against a printed record, and memory loses.

The most common mistakes#

• Reading the offer as a service. The only thing purchased is certainty about the amount today, and the price for it sits in the rate.
• Assuming the fee disappears. The card terms decide, and many issuers key the fee to the acceptance point, not to the displayed currency.
• Letting the terminal be operated for you. The currency is best named before the card goes in, with a look at the receipt afterwards.
• Treating cash machines like card terminals. Withdrawals can carry three costs at once, so the choice matters most there.
• Assuming online checkouts are exempt. The same conversion appears on booking sites, worded more politely.
• Discovering it after the fact and doing nothing. Without the receipt a dispute has nothing to rest on, as chargeback: when it applies explains.

What to say, and to whom#

The whole defence fits into one habit, and it works in any language because the terminal does the talking.

Before the card goes in. Say which currency the bill should be in. Where language is a barrier, pointing at the local currency on the screen does the same job, and most staff recognise the gesture immediately.

While the screen is showing. If two amounts appear, the conversion is already offered. Choosing the local currency at that point still declines it, because the card network converts afterwards regardless.

After the fact. If the home currency was charged without a choice being offered, the receipt carries the evidence and the card issuer is the address for the complaint, not the merchant and not the terminal operator. A photo of the slip taken at the counter keeps that evidence readable after the paper fades.

None of this requires an argument. The request is routine, it costs the merchant nothing beyond the shared markup, and in most places it is granted without comment. The amounts at stake are small on a coffee and material on a hotel bill, and attention is best spent in that order.

Related topics#

• What a foreign transaction fee is
• The cheapest way to get cash abroad
• Chargeback: when it applies
• What your card’s travel insurance really covers
• Resort fees and other hotel charges