Guide

International invoicing, the practical version

What you actually need on a cross-border invoice: currencies, wire details, tax IDs, VAT, and the W-8 / W-9 forms. The mistakes that cost you money on real international invoices, and how to avoid them.

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International invoicing is sending an invoice across a national border, where the buyer and seller are in different tax jurisdictions, often using different currencies and different banking systems. Compared to a domestic invoice, an international one needs more on it: a clear currency, the seller's tax ID, the right tax form on file with the buyer, the seller's full international bank details (SWIFT/BIC and IBAN where applicable), and the right VAT or sales-tax treatment. Get any of those wrong and the buyer's AP team will return the invoice or worse, the buyer's bank will withhold a portion of the payment until the paperwork is fixed.

What an international invoice needs that a domestic one does not

A US-to-US invoice can get away with bank account, routing number, and a memo line. An international invoice has to do more work. The minimum delta:

→Currency stated explicitly. Not "$1,000." That could be USD, CAD, AUD, SGD, or HKD. Write "USD 1,000.00" or "1,000.00 USD" so there is no ambiguity at the bank or in the buyer's accounting system.
→Your tax ID. US: EIN or SSN. EU: VAT number (begins with country code, e.g. DE123456789). UK: VAT number or UTR. Without it the buyer cannot reclaim VAT or properly classify the payment.
→SWIFT/BIC and IBAN where applicable. SWIFT/BIC routes the payment to the right bank globally. IBAN identifies the specific account in EU, UK, and many other countries. US accounts use account number + routing instead but US banks accept SWIFT for inbound international wires.
→Bank's full address. Some buyers' wire workflows require the receiving bank's name, branch, and country, not just the SWIFT.
→Reference / memo line that the buyer's bank will preserve. "Invoice INV-2026-0001 from [your name]" is what lets you reconcile the inbound wire when it lands.
→The right tax form on file with the buyer. US buyers paying foreign sellers need a W-8 series form (typically W-8BEN for individuals, W-8BEN-E for entities). Missing the form means 24-30% withholding on every invoice.
→VAT treatment for EU invoices. Either charge VAT, reverse-charge it (most common B2B intra-EU), or zero-rate as an export. The wrong choice triggers a returned invoice or a tax authority inquiry.

Currency: pick one, state it, hold it

Bill in your currency or theirs?

If you have any choice, bill in your home currency. The buyer's bank handles the FX conversion at their rate and you are paid the exact amount you invoiced. If you bill in their currency, you absorb the FX risk between invoice date and payment date, which on a 30 day Net term can move 1-3% on common currency pairs.

When the buyer insists on their currency

Many enterprise buyers will only pay in their currency. In that case, set the rate at the time of contract, lock the rate on the invoice, or quote with a small FX buffer (typically 2-3%) to absorb intra-month moves.

If you need to convert a quote into multiple currencies for the same invoice (or compare what you would receive net of FX), the free currency converter handles the math with current rates.

Bank details: SWIFT, IBAN, and the typo that costs $50

SWIFT / BIC

An 8 or 11 character code that identifies a specific bank globally. Required to route any international wire. Get it from your bank's international wire instructions page; do not guess from the bank name.

IBAN

A standardized account identifier used in EU, UK, Switzerland, the Middle East, and elsewhere. Two-letter country code + check digits + bank and account info. Validate before sending: a single typo can return the wire and cost $25-50 in bank fees on both sides. The free IBAN validator catches the most common errors via the mod-97 checksum.

US account: routing + account, not IBAN

US banks do not use IBAN. Provide the account number, the routing number (ABA), the bank's name and city, and the SWIFT/BIC for inbound international wires. Many US banks have a separate SWIFT for incoming wires than for domestic; use the international one on international invoices.

Wise, Revolut, Payoneer, and similar

These provide local receiving accounts in multiple currencies. Often cheaper than a wire because the buyer pays a domestic transfer (no SWIFT fee) and you receive in your account in their currency. The trade-off is you then convert to your home currency at the provider's FX rate.

Tax forms: W-8 vs W-9 (and why withholding is the enemy)

Any time a US business pays a non-US seller more than $600 in a year for services, they need a tax form on file before they cut a check. The wrong form (or no form) means the buyer is required by IRS rules to withhold 24% to 30% of every invoice and remit it to the IRS. You then have to claim it back on a tax return a year later, if you can claim it at all.

→W-9. For US persons (US citizens, residents, US companies). Provides your TIN to the buyer.
→W-8BEN. For non-US individuals (foreign freelancers, contractors). Certifies foreign status, often claims a tax treaty benefit that reduces or eliminates withholding.
→W-8BEN-E. For non-US entities (foreign companies). Same idea, more complex form, supports treaty claims.
→Other W-8 forms (W-8ECI, W-8EXP, W-8IMY). Specialized cases (effectively connected income, exempt orgs, intermediaries). Most freelancers and small agencies will not need these.

If you are unsure which form applies, the W-9 / W-8 picker resolves it in three questions and links to the official IRS PDF.

VAT, GST, and sales tax across borders

Sales tax handling on cross-border invoices is the source of most "this invoice was returned by AP" emails. The rules depend on what you are selling, where the buyer is, and where you are registered.

→EU B2B intra-EU services: Reverse-charge. You do not charge VAT; the buyer accounts for it under their own VAT registration. Your invoice must include both VAT numbers and the phrase "Reverse charge: VAT is to be accounted for by the recipient." Get this wrong and the buyer's accountant will bounce the invoice.
→EU services to non-EU customer: Usually outside the scope of EU VAT (zero-rated). Document the customer's location for your records.
→US seller, EU buyer: US has no VAT. EU buyer typically self-assesses VAT under reverse-charge. You should not add US sales tax to an export invoice.
→UK after Brexit: UK is now a separate jurisdiction from EU for VAT. UK-EU services are no longer reverse-charge by default; check the specific rule for what you sell.
→Digital services (B2C) into EU: EU VAT MOSS rules require the seller to charge VAT at the buyer's country rate above certain thresholds. Different from B2B; check the OSS / IOSS guidance.
→US sales tax across state lines: Triggered by physical or economic nexus in the buyer's state. The post-Wayfair threshold is typically $100k in sales or 200 transactions per year per state. Many services are still untaxed at the state level even where products would be.

For the math when sales tax does apply, the free sales tax calculator handles inclusive vs exclusive correctly (the most common bug in invoicing).

Common mistakes that cost real money

•No tax form on file means 30% withholding. The buyer's AP system will hold the form requirement until you provide one. Get the W-8BEN or W-8BEN-E to them before the first invoice, not after.
•Single-character IBAN typos return the wire. Most banks charge $25-50 to investigate or return a misrouted international wire. Validate before sending.
•Currency ambiguity gets translated wrong. "$1,000" without "USD" can land in your account as CAD 1,000 or AUD 1,000, depending on how the buyer's bank interprets it.
•Invoicing in the buyer's currency without an FX buffer. A 30-day delay on EUR/USD or GBP/USD typically swings 1-3%. On a $10k invoice that is $100-300 of unplanned loss.
•Missing the reverse-charge VAT note on EU invoices. The buyer's accountant cannot process the invoice and bounces it back, costing days or weeks.
•Wire fees not budgeted. Each side typically pays $20-50 in wire fees per transaction. On a small invoice, those fees are a meaningful percentage of the total.

International invoicing FAQ

Do I need to charge sales tax on an international invoice?

Usually no, if you are exporting services or goods to a customer in another country. Domestic sales tax (US state sales tax, EU VAT) is generally not added to true exports. EU B2B intra-EU services use reverse-charge instead of charging VAT directly. Check the specific rule for your country and what you sell; sales tax across borders is one of the trickier areas to get right.

What is SWIFT and do I always need it?

SWIFT (or BIC) is the global bank identifier code, 8 or 11 characters, that routes international wires. You always need it for an international wire transfer to or from a US account. EU/UK accounts use IBAN as the account identifier and SWIFT for the bank. Some lower-cost transfer services (Wise, Revolut, Payoneer) bypass SWIFT by using local receiving accounts.

Should I bill in my currency or the buyer's?

Bill in your currency if you can. You get the exact amount you invoiced and the buyer's bank handles FX. If you bill in the buyer's currency, you absorb FX risk between invoice date and payment date (typically 1-3% of swing on a 30 day term for major currency pairs). Many enterprise buyers will only pay in their currency; in that case, bake an FX buffer into your price.

What is reverse-charge VAT?

An EU mechanism where the buyer accounts for VAT on a B2B intra-EU service rather than the seller charging it. The seller's invoice must include both parties' VAT numbers and the explicit phrase 'Reverse charge: VAT is to be accounted for by the recipient.' Used for most cross-border B2B services within the EU.

What form does my US client need from me as a non-US freelancer?

W-8BEN if you are an individual, W-8BEN-E if you are a foreign company. Submit it to the client (not the IRS) before the first invoice. Without the form, US tax law requires the client to withhold 24-30% of every invoice and remit it to the IRS. The W-8 form often also lets you claim a tax treaty benefit that reduces or eliminates withholding.

How do I actually receive an international wire?

Provide the buyer with: bank name + city, your account number, your routing or sort code, your bank's SWIFT/BIC, your account holder name (must match the invoice), and (for EU/UK) your IBAN. Many US banks have a different SWIFT for incoming international wires than for domestic; use the international one on the invoice. Wires usually settle in 1-3 business days.

What is OSS / IOSS in the EU?

OSS (One Stop Shop) and IOSS (Import One Stop Shop) are EU schemes that let non-EU sellers register in one EU country and collect VAT for sales across all EU member states. Mostly relevant for B2C digital services and ecommerce. For B2B services, reverse-charge is the more common mechanism.

Last updated June 1, 2026