How to Invoice a Client in a Foreign Currency (2026 Guide)

You landed an overseas client, and now you face a question almost every freelancer eventually hits: do you invoice in your own currency or in theirs? Billing across currencies is not complicated once you decide a few things up front - which currency, which exchange rate, and how to protect yourself from the rate moving while you wait to be paid. This guide covers all three, plus exactly what to put on the invoice.

Which currency should you bill in?

There is no single right answer - it comes down to who carries the exchange risk and who finds it convenient.

• Your own currency: you know exactly what you will receive, and the client carries the conversion cost and risk. This is the simplest option for your bookkeeping.
• The client's currency: easier for the client to approve and pay, and often expected by larger companies - but you carry the risk that the rate moves against you before the payment lands.
• A neutral currency (often USD or EUR): common for international contracts where neither side uses the other's currency. The US dollar is accepted almost everywhere.

A practical rule: if the client is much larger than you, billing in their currency can win you the work; if you are billing many small clients, billing in your own currency keeps your accounts clean and predictable.

Which exchange rate to use

If you invoice in a foreign currency but keep your books in your home currency, you will need to convert the amount somewhere. Two common approaches:

• Rate on the invoice date: use the commercial (mid-market) rate on the day you issue the invoice. This is what most tax authorities expect when you record a foreign-currency invoice in your local accounts.
• An average rate: some businesses use an official monthly or annual average rate to smooth out daily swings. Many tax authorities and central banks publish these.

Whichever you choose, be consistent and keep a record of the rate and its source (your bank, a central-bank published rate, or a well-known FX site). Remember the mid-market rate is not what your bank will actually give you when the money converts, so build in a small margin if conversion cost matters to you.

Protecting yourself from currency swings

The risk with billing in the client's currency is that the rate can move between issuing the invoice and getting paid. On a 30- or 60-day term, a few percent swing can quietly eat your margin. Ways to manage it:

• Agree a fixed rate in the contract, or a clause that prices adjust if the rate moves more than an agreed amount (say 5%).
• Shorten your payment terms so there is less time for the rate to drift.
• Use a multi-currency account or a low-cost transfer service so you can hold the foreign currency and convert when the rate is favourable, rather than at whatever rate your bank offers on the day.

What to put on the invoice

• State the currency clearly - write 'USD 1,500' or '1,500 USD', not just a dollar sign, because many countries use the dollar symbol.
• Use the three-letter ISO code (USD, EUR, GBP, AUD, ZAR) at least once so there is no ambiguity.
• If you both want it, add a reference line showing the amount in your local currency and the rate used, for example 'Approx. R27,000 at USD 1 = R18.00 on 6 Jul 2026 (for reference only)'.
• Include full international payment details: IBAN or account number, SWIFT/BIC, bank name and address, and any intermediary bank information.
• Keep the usual fields - your details, the client's, an invoice number, issue date, due date, and a clear description.

Tax and VAT across borders

Whether you charge tax on a cross-border invoice depends on both countries' rules, not just yours. Exports of services are often zero-rated or outside the scope of your domestic VAT/GST, but there are conditions, and some countries require the client to account for the tax themselves (a 'reverse charge'). Check your own tax authority's rules on exported services before adding a tax line - and when in doubt, ask a local accountant.

If your client is specifically in the United States, our guide on how to invoice US clients from another country covers the payment and tax details in depth. New to invoicing altogether? Start with how to invoice a client as a freelancer and what to include on an invoice.