Which day your credit card uses for the exchange rate: swipe date or posting date
How a credit card converts currency automatically, why the rate is usually not the swipe-day rate, how to look up Visa, Mastercard and JCB rates on official tools, and how to read the statement line. No rate or fee numbers.
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- In general a credit card does not lock the rate at the swipe. A foreign-currency charge is converted into baht automatically when the merchant's transaction is submitted through the card network for settlement, often one or several days after the swipe. So the rate is usually the processing-day rate, not the swipe-day rate.
- The exact details depend on the network (Visa, Mastercard, JCB) and your issuing bank's terms. Check the network rate on the official tool, compare it with your statement, and read your bank's own terms.
What automatic currency conversion on a credit card means
When you pay by credit card in another currency, you do not need to exchange money first. The amount is converted into your card's currency through the card network and the issuing bank, which is why it is often called automatic conversion. On the statement you see a baht amount, usually with the original foreign amount alongside.
What to check with your own issuing bank is how conversion works under its terms and whether it adds any fee or margin, and how. Read the bank's own fee schedule; this page gives no figures.
Which day does the credit card exchange rate use
The shortest answer is that it is not always the swipe day. A common sequence is: you swipe, the merchant gets authorisation and holds the item, the merchant submits it for settlement, the network processes and converts it, and the bank posts it to your card account. The rate is often fixed at the later processing step.
- Swipe or transaction date: the day you paid at the merchant.
- Merchant submission date: some merchants submit at once, others later, such as hotels that submit at check-out.
- Processing or network conversion date: in many cases the day the rate is actually applied.
- Posting date: the day the bank records it on your statement.
Credit card rate: swipe date or posting date
| Date | 무엇인가 | Commonly used for the rate? |
|---|---|---|
| Swipe date | The day you pay at the shop | Generally the rate is not locked then |
| Processing date | The day the network processes the item | Often the day the rate applies |
| Posting date | The day the bank records it | Some banks may refer to it; check the bank's terms |
This table gives general principles, not any specific bank's terms.
The consequence is that if the rate moves between the swipe and the processing day, the baht amount can differ somewhat from what you worked out at the till, up or down. Hotels and car rentals that submit later can widen that gap.
Visa exchange rate: where to look it up
Visa provides an exchange-rate calculator on its official website, where you pick the currencies and a date to compare. The result is the network's reference rate, and your issuing bank may add a fee or margin, so it may not match your statement exactly. Find the tool through Visa's official site, as pages can change.
Mastercard exchange rate and JCB exchange rate
Mastercard and JCB also publish their own exchange-rate tools on their official sites. The idea is the same: a network reference rate by currency and date, useful for estimating but not the final figure your bank will charge. Look on each network's official site, and check the network's and your issuer's current information.
- Use the network rate as a benchmark, not as the exact figure your bank will charge.
- Pick the dates the tool offers and compare with the processing date on your item.
- If two networks give different figures, look only at the one that matches your card.
How to read the statement line and compare the rate yourself
- 1Find the original amount and currencyThe statement or bank app usually shows the original foreign amount. If not, use the merchant's receipt.
- 2Note the swipe date and the posting dateThe gap between them shows how long the item took to be processed.
- 3Check the network's official reference rate for those datesTry the swipe date and the posting date and see whether your baht amount is in the same neighbourhood.
- 4If still unsure, ask your issuing bankAsk how the rate and any fees are worked out under your card's terms, and ask the bank to explain any line you are unsure about.
Paying in local currency or baht at the terminal
Some shops and ATMs ask whether to pay in local currency or baht. Choosing baht at the merchant's terminal means the rate is set on the merchant's or terminal provider's side, which differs from choosing local currency and letting the network and bank convert. The DCC guide explains the choice in detail.
If the baht amount is not what you expected, what to check
- Did the merchant submit late, as hotels do at check-out?
- Did you choose baht or local currency at the terminal?
- Does your bank add a conversion fee or margin under the card's terms?
- Is it a pending item that is not the final amount? See the pending and refund guide.
If you are travelling: staying online, briefly
Checking card activity and your banking app during a trip needs a data connection. A data-only eSIM is one option; check the live price and plan details on the day you buy.
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Which day does a credit card use for the exchange rate?+
Generally it is not always the swipe-day rate. It is often the rate when the network processes the item, which can be one or several days after the swipe. Treat your issuing bank's terms as the final word.
Is the rate the swipe date or the posting date?+
Not necessarily either. It usually follows the network's processing step, which sits between the two dates, though some banks may describe it differently. Ask your bank or read the card's terms.
What does automatic currency conversion on a credit card mean?+
It means the foreign amount is converted into your card's currency for you, without exchanging money in advance, through the card network and the bank. Fees may apply under the bank's terms.
Where can I check the Visa exchange rate?+
On the exchange-rate calculator on Visa's official website. It is a network reference rate; your issuing bank may add to it, so it is not a guaranteed final figure.
Where can I see the Mastercard exchange rate?+
On the exchange-rate tool on Mastercard's official website. The idea matches Visa's: it is a reference rate you compare against your statement.
Where do I find the JCB exchange rate, and is it relevant to every card?+
Check JCB's official website. It applies only to cards on the JCB network; if your card is on another network, use that network's rate.
Why does the baht amount differ from what I calculated at the till?+
Because the rate can move between the swipe and processing day, your bank may add a fee, or the merchant may have applied conversion at the terminal. Work through the checklist above.
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