How to Invoice Clients in Different Countries: VAT, GST, Sales Tax & What You Need to Include

Domestic invoicing is straightforward: charge VAT/GST if you're registered, don't if you're not. Cross-border invoicing has more variables — and the mistakes go in both directions.

Overcharging tax (adding VAT to a UK client invoice when you shouldn't) means your client pays more than they should, their accountant flags it, and you have an awkward correction to make. In some cases the client withholds payment until the invoice is corrected — which delays you getting paid.

Missing required notes (not including "reverse charge applies" or your client's VAT number) means the invoice is non-compliant and may be rejected by their accounts team. Again — delays payment.

The good news for freelancers: cross-border B2B services are almost always zero-rated or exempt from your local tax. The buyer handles their own country's tax obligation via a mechanism called reverse charge. You just need to know the correct note to include on the invoice and which details to collect from your client upfront.

This guide covers the practical rules for the most common client locations. Tax law changes; if international income is significant to your business, verify the current rules with a local tax advisor. For the majority of freelance B2B work, the guidance here applies directly.

These three terms describe different tax systems used in different countries. They all ultimately tax consumption, but they work in very different ways.

The practical takeaway: these are different systems, but the question for international invoicing is the same in all cases — does your obligation to collect tax extend to customers in other countries? For B2B services, the answer is almost always no, with the buyer handling their own local tax.

Here's a practical breakdown for the most common client locations. These assume you are invoicing a business client (not a consumer) and that you are providing services (not physical goods). Your own country's registration status affects this — the notes below assume you are registered for VAT/GST in your own country where relevant.

Two concepts come up constantly in cross-border invoicing: zero-rating and reverse charge. Understanding them will save you a lot of confusion.

Zero-rating

A zero-rated supply is one where VAT/GST applies at 0%. This is different from an exempt supply. With zero-rating, you still report the supply on your VAT return, but you charge 0% tax. You can still reclaim VAT/GST on your inputs (business expenses). Exports of services to overseas business clients are commonly zero-rated in VAT and GST systems.

On the invoice, write the amount, show 0% VAT, and include a note explaining why (e.g., "Export of services — zero-rated" or "Reverse charge applies"). This tells your client's accountant and your own tax authority exactly what's happening.

Reverse charge

Reverse charge flips who accounts for the VAT. Instead of you charging VAT and remitting it to your tax authority, your client accounts for the VAT in their own country (at their local rate) and may also reclaim it in the same return. You collect nothing — the tax effectively cancels out for a VAT-registered business buyer.

This is why cross-border B2B services are generally low-friction from a tax perspective: you invoice at zero, the client handles their side. The note on your invoice makes this explicit. A good format: "Reverse charge applies — customer to account for any applicable VAT/GST in their jurisdiction."

When it gets more complex

B2C (selling to individual consumers, not businesses) across borders is harder. The EU, UK, and Australia all have special rules for digital services sold to consumers in their territories — registration requirements can kick in even for foreign suppliers. If you're selling to large volumes of end consumers internationally, you need specific advice for each market.

Regardless of which country your client is in, a well-structured international invoice includes the following. Missing items cause payment delays and create compliance headaches for both sides.

• Your full legal name and address. Including your country. International clients need this for their own compliance records.
• Your VAT/GST registration number (if registered). Required for VAT compliance in many jurisdictions.
• The client's full legal name, address, and VAT/GST number (if they're a registered business). This is critical for zero-rating and reverse charge — you need their number to legitimately apply 0% tax to B2B supplies.
• Invoice number, date, and payment due date. Standard on every invoice — non-negotiable for international invoices where payment timing may be longer.
• Clear description of services. What specifically was delivered? Vague descriptions cause problems if there is ever a dispute or a customs/tax inquiry.
• Currency clearly stated. USD, GBP, EUR, AUD — whatever you have agreed on. Never leave the client to guess.
• Tax treatment note. Why is there no VAT/GST charged? Say it explicitly: "Services zero-rated — export of services" or "Reverse charge applies — customer to account for VAT."
• Bank details for international transfer. IBAN and SWIFT/BIC for European/international transfers, or your preferred payment method. International wire transfers need complete details to avoid delays.

International invoices have an extra layer of payment complexity. Wire transfers take longer. Currency conversion introduces delays. Time zones mean follow-up emails sent at 9am for you arrive at 2am for your client. And if an invoice goes unpaid, chasing a client in another country can feel harder than chasing a local one.

This is exactly where a dedicated invoice tracking tool earns its keep. Once your invoice is sent, you need a system that:

• Shows you all outstanding invoices in one place, regardless of which country the client is in
• Tracks how many days overdue each invoice is and what follow-up has happened
• Helps you write a professional follow-up email at exactly the right tone — patient for a client dealing with wire transfer delays, firmer for one who has gone quiet

InvoiceGrid is built for this post-send phase. Add each invoice when it goes out, track its payment status on a visual Kanban board, log every follow-up attempt, and generate professional reminder emails in seconds. You can also use the free reminder email generator to draft follow-up messages that reference the invoice correctly and strike the right tone.

International work is good business. International invoicing doesn't have to be complicated — you just need the right information on your invoice and the right system for tracking what happens after you send it.