Invoicing in a Foreign Currency: Conversion and Best Practices

Invoicing in your client's currency reduces friction: they see familiar numbers in their payables system. The trade-off is exchange rate risk for you, and the need for clear rules about which rate applies and when an invoice counts as paid in full. This guide covers how to set those rules, what tax authorities require, and how to record the result.

Pick a pricing and conversion policy

Invoice in the client's currency, paid in the client's currency

You still convert to your home currency when the money reaches your bank, so your income depends on the rate on that day. Decide whether your bank's rate or a published reference rate is the benchmark if a dispute arises. The European Central Bank publishes euro reference rates around 16:00 CET each working day, but says they are "published for information purposes only" and that using them for transactions is "strongly discouraged" (ECB). They work as a neutral reference for a contract clause, not as the rate a bank will give you.

Invoice in your own currency

This moves the exchange rate risk to the client's finance team, but it can slow approval if they have to convert before paying. A hybrid works too: contract and invoice in your currency, and show an approximate amount in the client's currency in the notes, clearly marked as for information only.

What to state on the invoice

• The currency code (USD, EUR, GBP), not just a symbol, since "$" can mean several currencies.
• Whether prices include or exclude tax, and the tax treatment for the client's country: see the international invoicing guide and tax compliance guide.
• How to pay (SWIFT, SEPA, card or a payment link) and who pays fees.
• The exchange rate rule, if the client may pay in another currency.

UK VAT invoices in another currency

If you are UK VAT-registered and the supply is subject to UK VAT, you can show line amounts and the total excluding VAT in any currency, but the total VAT must be shown in sterling. HMRC's VAT Notice 700 says to convert using the UK market selling rate at the time of supply, HMRC's period rate of exchange for customs purposes, or another rate HMRC has agreed in writing (VAT Notice 700, sections 7.6 and 16.3). See our UK invoice requirements for the full list.

Tools and checks

Our free currency converter multiplies an amount by a rate. Its built-in rates are a dated snapshot, not live prices, so type in the rate from your chosen source before relying on the result. The discount calculator shows the annualised cost of an early-payment discount; it does not handle currencies.

Fees and short payments

International transfers and card or wallet payments can arrive net of fees, so a €2,000 invoice may arrive as €1,975. If you need the full amount, say in your terms that the client pays all sending and intermediary bank charges (for SWIFT transfers this is often written as the "OUR" charge option), and decide in advance whether you will invoice any shortfall.

Pair with a broader international workflow

For tax IDs, documentation and country-specific invoice rules, read invoicing international clients. For collections across borders, keep your follow-up neutral and factual.

Recordkeeping

Keep the invoice PDF, the exchange rate you used and its source, and the bank receipt together as part of your audit trail. For US federal tax, amounts on your return must be expressed in US dollars; if the dollar is your functional currency, convert each item at the rate on the date you receive, pay or accrue it (IRS: foreign currency and currency exchange rates).

Treasury basics for founders

If you realise exchange gains or losses, ask your accountant how invoice dates and payment dates affect your books. Forward contracts and other hedges only make sense once fees are small relative to the exposure; below that, a named rate source and a small pricing buffer usually do the job (see hedging currency risk). Keep one documented rate source for when clients ask. For clients with several entities, confirm which entity pays, so the invoice shows the right legal name and tax ID.

Closing checklist

• Each month, compare bank-settled amounts with invoice totals and log the differences.
• Update your published rate policy if your adviser changes it.
• Reconfirm bank details before large transfers (payment methods).
• Record any fee or rate waiver you agree with a client.
• Brief whoever answers client emails on how to reply to "which currency should we pay in?"

Metrics and cadence

Each month, compare the value you booked at the invoice-date rate with what actually arrived, and explain large differences. Count short payments caused by fees; if they rise, make the who-pays-fees wording clearer. Look at average days to payment by currency; slow corridors may need different payment terms.

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Keep invoices in your clients' currencies in one place: start free.

Conversion methods for invoices

The right method depends on contract length, how much rate movement you can absorb, and how much admin you want. Whatever you choose, write the source and the date into the contract.

Step-by-step: setting up multi-currency invoicing

Step 1: Choose your billing currency strategy

Options: (1) always your home currency (simplest for you; the client carries the exchange risk), (2) always the client's currency (easiest for the client; you carry the risk), (3) a major currency such as USD, EUR or GBP for all foreign clients, or (4) set price lists per market (most work). Pick one per client and apply it consistently.

Step 2: Write the conversion rule into the contract

Example clause: "Invoices are issued in USD. The client may pay the EUR equivalent at the ECB euro reference rate published on the invoice date. Bank charges are paid by the client." Without explicit terms, every late payment can turn into a rate dispute.

Step 3: Decide where you will receive foreign currency

A multi-currency account from a bank or payment provider lets you hold a currency rather than converting on arrival. Compare providers on their own published pricing: the total cost is the transfer fee plus the gap between the rate you get and the mid-market rate.

Step 4: Apply the correct tax treatment

Tax depends on where the supply is taxed, not on the currency. For example, a UK VAT-registered business supplying most services to an EU business customer usually charges no UK VAT, because those services are supplied where the customer belongs, and the customer accounts for VAT under the reverse charge (VAT Notice 741A). US clients will usually ask a non-US contractor for Form W-8BEN (individuals) or W-8BEN-E (entities) instead of a W-9. Check each country's rules in our country invoice guides.

Step 5: Track exchange gains and losses

Worked example: a US business invoices a UK client £10,000 when £1 = $1.25, so it books $12,500 of revenue. The client pays when £1 = $1.30, and $13,000 arrives. The extra $500 is an exchange gain, recorded separately from the sales income. Had the pound fallen to $1.20, $12,000 would arrive and the $500 difference would be an exchange loss. How gains and losses are taxed depends on your country and accounting method, so confirm with your accountant.

Common scenarios

US freelancer billing a UK business $10,000: bill in USD and let the client convert. Note on the invoice: "Payment due in USD by international wire transfer; all bank charges to be paid by the sender."

EU consultant billing a US company: billing in USD is common because US companies pay in dollars. Receive into a USD balance if you have USD costs, and record each conversion to EUR at the rate you actually received.

Online business with consumers in several countries: set prices per currency so customers see round local prices, and check each country's consumer VAT or sales tax rules before you launch.

Larger business with significant foreign receivables: at that scale, a finance lead or adviser typically sets a hedging policy, and an accounting system tracks receivables per currency.

Doing this in InvoiceQuickly

• Currencies: choose USD, EUR, GBP, CAD, AUD, INR or PKR for each invoice.
• No automatic conversion: InvoiceQuickly shows amounts only in the invoice currency. If you need a second currency, such as sterling VAT on a euro invoice, work it out yourself and add it to the notes with the rate and its source.
• Payment links (Pro): Stripe and PayPal links charge the invoice's remaining balance in the invoice currency, on your own Stripe or PayPal account; that provider's fees and conversion terms apply.
• Dashboard: totals are kept separately for each currency, not added together.

Frequently asked questions

What's the cheapest way to receive international payments?

It depends on the currencies and amounts. Compare the total cost: the sender's and receiver's fees plus the difference between the rate applied and the mid-market rate. Ask clients to use local payment rails where your provider supports them, and state in your terms who pays fees.

Should I bill in my client's currency or my own?

Billing in your own currency keeps your accounting simple and puts the exchange risk on the client. Billing in the client's currency is easier for them and can speed up approval, but you carry the risk. For larger or longer contracts, agree the currency and the rate rule in the contract.

How do I handle exchange rate movements between invoice and payment?

Choose one of three approaches and put it in writing: (1) fix the amount in the invoice currency, so whoever converts carries the risk; (2) allow payment in another currency at a named rate on a named date; or (3) fix a rate in the contract for its whole term. Always name the rate source.

Is there a tax difference between exchange gains and regular income?

It depends on the country. For US federal tax, amounts on your return must be in US dollars and you convert at the rate on the date you receive, pay or accrue an item (IRS). How a gain is classified depends on your circumstances, so ask your accountant.

What about cryptocurrency invoicing?

Some businesses accept stablecoins or other crypto assets, but most clients pay by bank transfer or card, and crypto adds price, tax and record-keeping questions. InvoiceQuickly does not support crypto payments.

Last reviewed: 28 October 2026. General information, not tax or financial advice.