Currency conversion at checkout: who converts, and at what cost

Pay a foreign shop and, at some point, a number in one currency becomes a number in another. Most people never see where that happens or who decides the rate. Yet the choice between converting at the checkout or later can change the final amount noticeably, and the same conversion runs in reverse when a refund comes back.

This guide explains who converts a cross-border card payment, how rates and fees enter the picture, and how to see the final figure before you pay.

Three places a conversion can happen

On the shop's side, before you pay

Some shops show prices in your currency from the start. They have converted their own prices, either with a fixed price list per country or a daily rate. You pay the price shown, and the card is charged in that currency. No surprise at checkout, but the shop chose the rate.

On the shop's side, at the checkout

A shop priced in its own currency may offer, at the last step, to charge you in your own currency instead. This is often called dynamic currency conversion (DCC). The checkout shows a converted amount, sometimes with the rate, and asks you to choose. The conversion is done by the shop's payment provider at a rate it sets, usually including a margin.

On the card's side, after you pay

If you pay in the shop's currency, the payment arrives on the card's side in that currency and is converted there, at the rate used by the card network or issuer that day, plus any conversion fee the card applies.

Each place can be fine. What matters is knowing which one is happening, because the rate and the fees differ.

How to judge a conversion offer

When a checkout offers to charge you in your home currency, do a quick comparison:

1. Note the price in the shop's currency.
2. Look up a current reference rate (a reputable currency converter or your bank's published rate).
3. Convert the price yourself and compare it with the offered amount.

If the offered amount is close to your own conversion, the convenience may be worth it: you know the exact amount that will leave the card. If it is clearly higher, you are paying for that convenience through the rate. In that case, choosing to pay in the shop's currency and letting the card's side convert is often cheaper, provided the card's own conversion fee is modest.

There is no single right answer. The point is to decide, rather than accept the default without looking.

Fees that ride along with conversion

Conversion rarely comes alone. Watch for:

• A margin in the rate. The rate offered at a checkout usually differs from the reference rate; the difference is the provider's income.
• A conversion or foreign transaction fee on the card's side, often a percentage of the amount.
• Payment fees some shops add for card payments, foreign cards, or certain card types.

These appear in different places: some on the checkout page, some only on the card statement. Priced in one currency, charged in another looks at how to find the final figure before you commit.

Taxes are separate

A converted price may still be missing tax. Many foreign shops add VAT, GST or sales tax at the last step, depending on where you are. The conversion applies to the total including tax, so read the tax line before you compare amounts. VAT, GST and sales tax lines on foreign invoices explains what those lines mean.

Refunds run the conversion backwards

When a foreign purchase is refunded, the refund is converted back, at the rate on the day it is processed. If the exchange rate moved, the amount that returns can be higher or lower than what left. Conversion fees may also apply to the refund. For a large purchase that might be cancelled, it is worth knowing this before you pay.

Subscriptions and conversion

A subscription priced in a foreign currency is converted at every renewal, at that day's rate. Your monthly cost therefore moves slightly from month to month, even though the price never changed. If a card holds a fixed balance, leave a small margin for that movement, so a renewal is not declined because of a few cents. Sizing a card: matching the balance to the job shows how to add a sensible buffer.

Cards ordered here

Cards ordered here are funded in US dollars. When you pay a shop that charges in dollars, there is no conversion on the card's side; the amount on the checkout is the amount that leaves the card, plus any tax the shop adds. When you pay in another currency, the conversion happens at one of the points described above, and the converted amount is what reduces the balance. Our fees (the funding fee and the setup fee shown on the costs page) are charged once, when you order the card, not per purchase.

A worked example

Imagine a course priced at 80 in a foreign currency. At the last step the checkout offers to charge you in dollars and shows an amount. Before choosing, you look up the current reference rate, convert the 80 yourself, and compare.

• If the checkout's dollar amount is within a small margin of your own figure, accepting it gives you certainty about the final number at little cost.
• If it is noticeably higher, you decline the offer and pay in the course's own currency. The conversion then happens on the card's side at that day's rate, plus whatever conversion fee the card applies.

Either way, you now know why the amount on the card is what it is, and you can explain it later if the course needs to be claimed as an expense.

A short checklist

Before paying a foreign shop:

• Which currency is the price in, and which will the card be charged in?
• Is the checkout offering to convert for me? If so, how does its amount compare with a reference conversion?
• Is tax included, or added at the end?
• Does the card have enough balance for the converted total plus a small margin?
• If this might be refunded, am I comfortable with the rate moving in between?

In short

Conversion is not hidden, but it is easy not to look at. Know where the conversion happens, compare any offered rate with a reference, read the tax line, and leave a margin on cards with a fixed balance. The few seconds it takes are the cheapest part of a foreign purchase.