Foreign Currency Transactions Accounting Explained

Recording a foreign currency sale or purchase

Foreign currency transactions accounting is about how you enter invoices, payments, and balances when the transaction currency isn’t the one you use for your financial reports. Most accounting guidelines expect you to record each deal using the exchange rate from the day the transaction happens. Your reporting currency is the single currency that appears in your accounts, such as EUR or USD.

Imagine a Dutch business sends out a sales invoice priced in US dollars. That invoice is recorded in euros based on the exchange rate valid on the invoice date. The receivable then remains in euros at that value until payment comes in. International Financial Reporting Standards (IFRS), used in large parts of the world, take this approach and allow you to use an average rate for a period if it’s close to real market rates. That said, national rules can differ, so your local accounting standards may require something else. To see how to prepare the invoice itself, see how to invoice a client in a foreign currency.

Realised and unrealised exchange differences

When rates fluctuate between the transaction date and payment or reporting date, exchange differences happen. There are two ways these show up in your records.

Realised exchange differences are recorded when you’ve actually settled a foreign currency position, like getting paid by a customer. If the euro-dollar rate shifts between the invoice and when you’re paid, you post the difference in your profit or loss account.
Unrealised exchange differences are for open balances still showing on the books at period-end. For example, with an invoice unpaid at the close of the month, you revalue it using the closing rate, and the resulting change is also usually recorded in profit or loss.

Realised means the transaction is done, the money’s actually moved. Unrealised means gains or losses are only on paper until you settle the balance. If you’re interested in tracing where exchange gains or losses come from, see details on transaction, translation and economic exposure.

Keeping a clear audit trail for currency entries

For each time you record foreign currency in your accounts, make a note of the rate, its date, and where it came from. Many bookkeepers keep all three amounts together: the sum in the transaction’s actual currency, the rate used, and the calculated total in your reporting currency. Doing it this way lets you cross-check entries and explain any differences later if a question comes up.

Popular rate sources include your bank’s quoted rate, an official central bank reference, or the rate built into your accounting software. The important part is to be consistent with your method and stick to any policy set by your accountant. If you’re managing several currencies, using a multi-currency business account simplifies tracking balances by each currency you hold.

Frequently asked questions

Which exchange rate should I use when recording an invoice?

You should use the spot rate from the actual invoice date in most accounting frameworks, or an average rate for the period if that’s an accurate reflection of market rates. Pick your rate source and use it the same way each time, making a note of it. The exact method depends on both your local standards and your accountant’s advice, so confirm what applies to you before entering invoices.

Does this article cover tax on exchange gains?

No, this page explains accounting treatment only. The taxability of an exchange gain or loss, and the timing, depend on rules set by your country’s tax code, which can be very different from place to place. In some countries, the tax result matches what’s shown in your accounts; in others, extra steps are required or exceptions made. For tax matters, check with your tax authority or speak with an adviser familiar with your jurisdiction.