Key Takeaways
- The UK–US double tax treaty applies when you live and work in the UK but earn income from US clients, and it determines which country has the right to tax that income.
- If you physically work in the UK, your income is normally taxed in the UK, regardless of where the client is based or how you are paid.
- US clients should usually pay you gross, with no US tax withheld, because services performed in the UK are not US-sourced under the treaty.
- All income from US clients must be declared on your UK tax return.
- Most UK residents do not owe US income tax on work done entirely in the UK. US businesses may still request compliance documentation.
- The treaty prevents double taxation only when it is applied correctly
- Most issues arise from avoidable mistakes: accepting incorrect US withholding or confusing reporting requirements with tax actually being due.
Getting in touch with a specialist accountant who knows everything about the creative sectors in the UK, and what it means working with US businesses can help a lot. We offer a free, no obligation call:
Note: While the treaty covers where income is taxed, real-world assignments can become far more complex if you need to travel to the US, as this can trigger separate tax, visa, and insurance issues that go beyond what the treaty alone addresses.
Table of contents
- 1. When the UK–US double tax treaty matters for your work
- 2. Where your income is taxed when you work from the UK
- 3. Whether US tax should be withheld by your client
- 4. What you need to do on your UK tax return
- 5. What you may need to do on the US side
- 6. How the UK-US tax treaty benefits you
- 7. Common mistakes when working with US clients
- 8. Get professional advice on double taxation rules
1. When the UK–US double tax treaty matters for your work
The UK–US double tax treaty matters as soon as you live and work in the UK but earn income from US businesses or clients. It exists to decide which country has the right to tax your income when both tax systems could claim it.
For most UK-based freelancers, contractors, and business owners, the key factor is where you physically do the work. If the work is carried out in the UK, the UK normally has the primary right to tax that income, even if the client is based in the US.
The treaty becomes relevant when there is a risk of the same income being taxed twice. It sets the framework that prevents this, provided the correct reporting and documentation are in place.
2. Where your income is taxed when you work from the UK
If you live in the UK and physically do your work here, your income is normally taxed in the UK, even when your clients are based in the US. The deciding factor is where the work is performed, not where the client is located or where the payment originates.
Freelance fees, contractor income, and most self-employed earnings from US businesses are treated as UK-taxable income when the work is done remotely from the UK.
Being paid in dollars or by a US company does not change this position!
The UK–US double tax treaty supports this by limiting the US’s right to tax business profits when you have no physical presence there, such as an office or permanent base.
3. Whether US tax should be withheld by your client
In most cases, US clients should not withhold US income tax from payments for work you carry out from the UK. This is because the income is earned outside the US and is not treated as US-sourced income under the treaty.
Issues usually arise when a US client is unsure how to treat a non-US contractor.
They may assume withholding is required simply because they are a US business. The treaty exists to prevent this, but clients often need confirmation of your status.
You have to confirm that you are a UK resident and not subject to US income tax on that work. Once this is documented correctly, your invoices should be paid gross, with no US tax deducted.
4. What you need to do on your UK tax return
All income earned from US clients must be included on your UK tax return, just like income from UK or other overseas clients.
From HMRC’s perspective: it is taxable because the work is carried out in the UK.
If you are self-employed or run a UK company, this income is reported through your usual Self Assessment or Corporation Tax return. There is no special category simply because the client is US-based.
If no US tax has been withheld, there is nothing extra to claim. If US tax has been deducted incorrectly, this is where relief or a foreign tax credit may apply, but the UK return remains the main place where the income is taxed.
5. What you may need to do on the US side
For most people living and working in the UK, you do not owe US income tax on services performed entirely in the UK, even if your clients are US businesses.
That said, US systems are paperwork-heavy. Some US businesses require confirmation that you are not a US taxpayer and that the income is not US-taxable. These requests are usually administrative, not an indication that tax is due.
In limited situations, a US filing requirement may still exist even when no US tax is payable. Filing obligations and tax liability are not the same thing, and this distinction is where confusion often arises.
6. How the UK-US tax treaty benefits you
The UK–US double tax treaty is designed to stop the same income being taxed by both countries. When you work from the UK, it limits the US’s right to tax your income and leaves the UK as the primary taxing country.
If US tax is deducted in error, the treaty allows that tax to be relieved so the same income is not taxed twice. The treaty does not work automatically.
It’s based on correct reporting, documentation, and clear application of the rules.
7. Common mistakes when working with US clients
The following mistakes cause most issues for UK residents working with US businesses.
Assuming US tax must always be deducted
US tax does not automatically apply just because the client is US-based. When the work is carried out in the UK, withholding should not be the default position.
Confusing the client’s location with where the work is done
Tax on services depends on where the work takes place. Client location, payment currency, or banking arrangements do not change this.
Not responding properly to client compliance requests
Ignoring or mishandling documentation requests often leads to unnecessary withholding. These requests are usually procedural.
Treating incorrectly withheld US tax as unavoidable
US tax deducted in error is often recoverable or creditable. Accepting it without challenge can result in double taxation.
Mixing up tax liability with reporting obligations
Being asked for forms or confirmations does not mean tax is due. Reporting and tax payable are separate issues.
Failing to keep clear records of where the work is performed
Clear records help support your position if questions arise. Contracts, invoices, and proof of working location matter.
8. Get professional advice on double taxation rules
Working with US clients from the UK is usually straightforward, but complications arise when income increases, paperwork is challenged, or US tax treatment is pushed incorrectly.
WallsMan Creative specialises in UK-based creative professionals and founders working with international clients, including the US. The focus is on applying the UK–US double tax treaty correctly, keeping income taxed in the right country, and ensuring reporting is clear, compliant, and stress-free.
