If you run a UK agency and your clients are based abroad, you have probably asked yourself: do I charge them VAT? The answer is not the same for every client. Get it wrong and you could undercharge a client, overpay HMRC, or trigger a VAT registration requirement in another country.

This is a practical guide on invoicing international clients from your UK agency: VAT rules for B2B services, B2C services, and the specific cases that trip up agency founders most often.

The rules here apply to VAT-registered UK agencies. If you are not VAT-registered yet (your turnover is below the £90,000 threshold), you do not charge VAT at all. But once you register, international invoices need careful handling.

The Basic Rule: Place of Supply

VAT is a tax on consumption. The general principle is that VAT should be charged in the country where the customer belongs. For services, this means the place of supply determines which country's VAT applies.

For UK agencies selling services to overseas clients, the place of supply depends on two things:

  • Is your client a business (B2B) or a consumer (B2C)?
  • Where is your client based?

Let us walk through each scenario.

B2B Services: The Reverse Charge

If your client is a business (VAT-registered in their own country), the place of supply is where the client belongs. That means the supply is outside the scope of UK VAT. You do not charge UK VAT on your invoice.

Instead, your client accounts for the VAT in their own country using a mechanism called the reverse charge. They self-assess the VAT on their local VAT return and, if they are fully taxable, reclaim it in the same return. No cash changes hands for the VAT element.

For your invoice, this means:

  • No UK VAT added to the total
  • A clear statement that the reverse charge applies
  • Your client's VAT number (or equivalent) on the invoice

Here is an example. Your 12-person digital agency in Shoreditch invoices a US marketing firm $15,000 for a brand strategy project. The US firm is a business. You issue the invoice with no UK VAT. You note "Reverse charge: customer to account for VAT in the United States." The US firm handles the tax on their side.

You still record the sale in your UK VAT return. It goes in Box 6 (value of supplies) and Box 7 (value of exports). But not in Box 1 (output tax) or Box 3 (total output tax). Your accountant will show you exactly how to code this in Xero or QuickBooks.

What You Need from Your Client

To treat a supply as B2B, you need reasonable evidence that your client is a business. The safest approach is to obtain their VAT registration number or equivalent tax ID. For EU clients, you can validate their VAT number through the VIES system. For non-EU clients, a company registration number or tax ID is sufficient.

If you cannot confirm they are a business, treat the supply as B2C. That changes the VAT treatment entirely.

B2C Services: The General Rule

If your client is a consumer (not a business), the place of supply is where you, the supplier, belong. For a UK agency, that means the supply is subject to UK VAT. You charge 20% UK VAT on your invoice, regardless of where the client lives.

This catches many agency founders out. A web designer in Manchester Northern Quarter builds a site for a US-based individual. The client is not a business. The designer must charge 20% UK VAT on the invoice, even though the client is in America.

There are exceptions for certain services supplied to consumers outside the UK. But for the standard agency services we see, marketing, design, PR, development, consultancy, the general B2C rule applies. You charge UK VAT.

EU Clients: Post-Brexit Rules

Since 1 January 2021, the UK is treated as a third country by the EU. The rules are now the same as for any other non-EU country.

For B2B services to EU businesses: no UK VAT. Reverse charge applies. Your client accounts for VAT in their own EU member state.

For B2C services to EU consumers: you charge UK VAT at 20%. This is the same as the general B2C rule above.

There is no longer any requirement to register for VAT in an EU country purely because you sell services to consumers there (the old "distance selling" rules for services were abolished for UK suppliers post-Brexit). However, if you have a physical presence in an EU country, an office, a branch, or staff working there, you may need to register for VAT locally. That is a separate conversation with your accountant.

Non-EU Clients: The Simpler Side

For clients in the US, Canada, Australia, UAE, and other non-EU countries, the rules are straightforward.

B2B: No UK VAT. Reverse charge applies to the client.

B2C: UK VAT at 20% applies.

The only complication comes if you supply services that are physically performed in the client's country. For example, if your agency sends a team to Dubai to run a campaign on the ground, the place of supply may shift to the UAE. But for the vast majority of UK agencies delivering services remotely, the rules above hold.

Invoicing Format: What to Include

Your international invoices should include the same core information as a domestic invoice, plus a few extras:

  • Your company name, address, and VAT number
  • Your client's name, address, and VAT/tax ID (for B2B)
  • A unique invoice number and date
  • A description of the services
  • The net amount (before VAT)
  • For B2B: "Reverse charge, customer to account for VAT"
  • For B2C with VAT: the VAT rate and amount
  • The total amount due

If you use accounting software like Xero, FreeAgent, or QuickBooks, you can set up tax rates for "Zero-rated exports" or "Outside scope, reverse charge." Do not use the standard 20% rate for B2B international invoices. That would mean you charge VAT you should not, and your client cannot reclaim it from HMRC.

VAT Return Treatment

When you submit your VAT return, international supplies are recorded differently depending on the type:

  • B2B supplies to overseas businesses: Box 6 (value of supplies) and Box 7 (value of exports). No entry in Box 1 or Box 3.
  • B2C supplies to overseas consumers: Box 6 and Box 1 (output tax at 20%). Also Box 3.

Your accountant will handle this, but it is worth understanding because getting the boxes wrong can trigger HMRC queries. If you file your own VAT returns through MTD-compatible software, check the tax rate codes carefully.

Common Mistakes Agency Founders Make

Here are the errors we see most often when reviewing international invoices for our clients at Agency Founder Finance:

1. Charging VAT to B2B Clients by Default

Some agencies add 20% to every invoice because that is what they do for UK clients. For international B2B clients, this is wrong. You are overcharging your client and creating a reconciliation problem. The client cannot reclaim UK VAT from their local tax authority.

2. Not Charging VAT to B2C Clients

The opposite mistake. An agency invoices a US consumer without VAT because "they are abroad." But the place of supply is the UK. You should have charged 20%. HMRC can assess the missing VAT plus penalties.

3. Assuming All EU Clients Are the Same

Post-Brexit, EU B2B clients need the reverse charge treatment. Some agencies still treat EU clients like UK clients and charge VAT. Correct this immediately if you have been doing it.

4. Not Collecting VAT Numbers

Without a valid VAT number or tax ID, you cannot prove the client is a business. HMRC may challenge your treatment if audited. Always collect and record the number.

5. Confusing "Zero-Rated" with "Outside Scope"

Some agencies use a 0% VAT rate for B2B international invoices. Strictly, the supply is outside the scope of UK VAT, not zero-rated. The distinction matters for partial exemption calculations and EC sales lists (now largely irrelevant post-Brexit, but the principle stands). Use the correct tax treatment in your software.

When You Might Need to Register for VAT Abroad

There are limited circumstances where a UK agency must register for VAT in another country:

  • You have a physical establishment (office, branch, staff) in an EU country
  • You supply certain digital services to consumers in an EU country (though this is rare for agency services)
  • You supply services that are physically performed in another country (e.g., on-site consultancy in France)

If any of these apply, speak to your accountant before issuing another invoice. Registering for VAT in another country is an administrative burden, but failing to do so can lead to penalties.

Currency and Exchange Rates

You can invoice in any currency. Most UK agencies invoice international clients in GBP, USD, or EUR. For VAT purposes, if you charge UK VAT on a B2C invoice issued in USD, you must convert the net amount to GBP using the HMRC-approved exchange rate for the date of supply. HMRC publishes monthly rates. Your accounting software can usually handle this automatically.

If you invoice in a foreign currency and do not charge VAT (B2B), the exchange rate matters only for your bookkeeping and corporation tax. The VAT return records the GBP equivalent of the net value.

Practical Example: A Full Walkthrough

Let us put this together with a real scenario.

You run a Bristol-based PR agency. You have three clients:

  • Client A: A UK-based fintech company (B2B, domestic). Invoice with 20% VAT.
  • Client B: A German software company (B2B, EU). Invoice with no UK VAT. Include their German VAT number. Note the reverse charge.
  • Client C: A US-based individual who wants PR for their personal brand (B2C, non-EU). Invoice with 20% UK VAT.

On your quarterly VAT return, Client A goes in Box 1 (output tax), Box 3, and Box 6. Client B goes in Box 6 and Box 7 only. Client C goes in Box 1, Box 3, and Box 6.

If you are unsure about any of these treatments, ask your accountant before the quarter ends. Correcting a VAT return after submission is possible but takes time.

How Agency Founder Finance Can Help

We are ICAEW qualified accountants who work exclusively with agency founders. International VAT is one of the areas where we save our clients time and money. We review your client list, confirm the correct VAT treatment for each, and set up your accounting software with the right tax rates.

If your agency has started working with international clients recently, or if your client mix has changed, book a call with us. We will check your current invoicing and fix any issues before HMRC does.

Summary: The Decision Tree

Here is the quick reference for invoicing international clients from your UK agency: VAT rules:

  • Is the client a business? → No UK VAT. Reverse charge. Collect their VAT/tax ID.
  • Is the client a consumer? → Charge 20% UK VAT. Unless the services are physically performed abroad (rare for most agencies).
  • Is the client in the EU? → Same rules as above. No special treatment post-Brexit.
  • Are you unsure? → Ask your accountant. A 10-minute check now saves hours of correction later.

International clients are a great way to grow your agency. Get the VAT right from the first invoice and you avoid the headache of retrospective adjustments.