Working Overseas: How Expat Tax Works

Working overseas completely changes how your tax works. Whether you're a UK expat relocating to the US, an American taking a contract in London, or working anywhere in between, you'll need to understand tax residency rules, whether you owe tax in two countries, and how to calculate your actual take-home pay. This post breaks down the essentials for both UK and US expats — plus the strategies to keep more of what you earn.

What Does Working Overseas Mean for Your Taxes?

When you work abroad, you don't simply "escape" tax by leaving the UK or US. Both countries tax based on residency, citizenship, or both — and those are not the same thing.

UK expats: You pay UK tax only if you're classified as a UK resident under the Statutory Residence Test (SRT). If you're non-resident, you pay UK tax only on UK-sourced income (rental property, pensions). You'll pay tax in your country of residence on your employment income instead.

US expats: If you're a US citizen, you file a US tax return every year, no matter where you live. However, the Foreign Earned Income Exclusion (FEIE) lets you exclude roughly $125,000 of foreign earned income from US taxation. You'll also file taxes in your country of residence.

The practical result: most expats file taxes in two countries but use credits or exemptions to avoid paying twice on the same income. Double taxation treaties exist for this reason — they prevent you from being taxed at full rates in both the UK and your host country.

UK Expats: The Statutory Residence Test

The Statutory Residence Test determines whether you're UK resident for tax purposes. It's not your passport, nor how many days you spend here — it's a formula:

• 16+ years in the UK, and now abroad? You're typically non-resident if you work full-time abroad (fewer than 40 UK working days per year).
• Fewer than 16 years in the UK, and now abroad? You're usually non-resident if you work full-time abroad (fewer than 40 UK days) and have no UK ties (home, job, family).
• Split years available? If you leave the UK partway through a tax year (6 April to 5 April), you might claim a "split year" and pay tax as a non-resident only from your departure date.

Once non-resident, you stop paying UK National Insurance on your foreign earnings — a saving of 8% or more. You'll pay whatever tax applies in your host country instead.

Key point: Many expats who've left the UK are surprised to discover they're still classified as resident if they maintain a UK home, have family here, or work fewer than 40 UK days. Check the full SRT guidance for your exact situation — it's complex enough to warrant a tax accountant if you're on the borderline.

US Citizens and Expats: The Foreign Earned Income Exclusion

If you're a US citizen abroad, filing is mandatory. But you get a significant break: the Foreign Earned Income Exclusion (FEIE).

In 2026, you can exclude approximately $125,000 of foreign earned income from US taxation. That means:

• A $100,000 salary overseas is entirely exempt from US federal tax (though you still owe state tax if your state requires it, and self-employment tax if you're self-employed).
• A $150,000 salary faces US tax only on $25,000.

You'll still pay tax in your country of residence, but the FEIE prevents you from being taxed by both the US and (say) the UK on the same money.

Gotcha: The FEIE applies to earned income only, not investments, dividends, or passive income. If you're living off investment returns, the US taxes those regardless of where you are.

Breaking Down Your Take-Home Pay: Examples

Here's what expat salaries look like after tax, depending on where you work.

Working in the US: $65,000 salary (single, no state tax)

• Gross: $65,000
• Federal income tax: ~$8,500
• Social Security (6.2%): $4,030
• Medicare (1.45%): $943
• Take-home: $51,527 ($4,294/month)

This assumes the standard deduction; actual numbers depend on whether you itemize, claim the FEIE, and whether you owe state tax. Run your exact figures through our US salary calculator to see your real take-home.

Working in the UK: £35,000 salary

• Gross: £35,000
• Income tax: £4,486 (0% on the first £12,570, then 20% on the rest)
• National Insurance: £2,690 (8% on earnings between £12,570–£50,270)
• Take-home: £27,824 (~£2,319/month)

This assumes you're resident and paying UK tax. If you're non-resident, you'd pay the tax in your host country instead. Compare your expected take-home with our UK salary calculator.

Working in Germany: €50,000 salary (typical rates)

• Gross: €50,000
• Income tax: ~€6,500
• Social security (including pension): ~€7,000
• Take-home: €36,500 (€3,042/month)

Tax varies wildly by country — Germany has higher social contributions than the UK, while the UAE has no income tax at all.

Deductions That Reduce Your Tax Bill

Several deductions matter for expats especially:

Home office or professional fees. If you're self-employed abroad, you can deduct home office costs, professional development, travel to client meetings, and equipment. If you're employed, this depends on your contract and host country rules.

Pension contributions. Contributing to a pension reduces your taxable income — a substantial benefit. In the UK, contributing £5,000 to a pension costs you only £4,000 from net pay (the government effectively contributes the other £1,000 via tax relief). In the US, a 401(k) contribution is pre-tax, so a $5,000 contribution reduces your taxable income dollar-for-dollar. Our detailed guide on salary sacrifice explains the mechanics in detail.

Remittance basis (UK only). If you're a non-resident but have overseas income you don't bring into the UK, you might claim "remittance basis" and avoid UK tax on that income. This only works if the money stays outside the UK — bring it in and you owe tax.

Housing allowance (depends on country and employer). Some expatriate positions include housing allowances or company housing. The tax treatment varies; in some countries it's tax-free, in others it's taxable income.

Foreign tax credits. If you've paid tax in your host country, you can usually claim that as a credit against US tax (if you're a US citizen) or use it to offset UK tax (if you're a UK resident claiming foreign income). This prevents the worst-case scenario of double taxation.

Tax Efficiency Strategies for Expats

Understand double taxation treaties. The UK has treaties with the US, Canada, Australia, and 100+ other countries. These specify which country gets the primary right to tax your income. Study your treaty; it often saves thousands.

Time your departure and return. If you're leaving the UK mid-tax-year (after 5 April), claim a split year — you'll be treated as non-resident from your departure date. If you're returning, the same split-year relief applies. This is huge if you're moving in July; instead of paying UK tax for the full year, you pay it only until July.

Use tax-advantaged accounts. UK expats can still contribute to ISAs (if non-resident but with UK ties, rules are stricter). US expats can use the Foreign Earned Income Exclusion and — if eligible — the Foreign Tax Credit or exclusion on foreign housing. Both let you shelter significant income from double taxation.

Separate employment and self-employment income. If you're both employed and freelancing, understand how each is taxed in your host country. Some countries tax employment income more favorably than self-employment.

Track your days outside your home country. For UK SRT purposes and US expat rules, your physical presence matters. US citizens need to prove physical presence to claim the FEIE; UK expats need to track working days in the UK. A simple spreadsheet or app is invaluable.

Review our post on calculating your effective tax rate to understand what percentage of your income actually goes to tax across all sources.

Frequently Asked Questions

Do I stop paying UK tax if I move abroad? Not automatically. You pay UK tax if you're classified as resident under the Statutory Residence Test. If you work full-time abroad and have no UK ties, you'll typically be non-resident and won't pay UK tax on your foreign employment income. However, you'll still owe UK tax on UK-sourced income (rental property, UK pensions, UK bank interest). Check the SRT to confirm your status; it's not obvious.

Can I claim the US Foreign Earned Income Exclusion if I work for a US company remotely? Yes, if you meet the physical presence test (you're out of the US for at least 330 days over a 12-month period) or pass the bona fide residence test (you're a tax resident of another country). Working for a US company doesn't disqualify you; what matters is where you are physically and your tax residency.

Do I pay tax in two countries? Probably not at the same full rate. You'll file in both countries (if applicable), but double taxation treaties and mechanisms like the FEIE or foreign tax credits prevent you from paying full tax in both. However, some income (e.g., US citizens' worldwide income) is taxable in the US even if it's already been taxed abroad. Run the numbers through a tax calculator to see your specific situation.

What happens to my UK pension if I move abroad? You can continue to contribute to a UK pension even if you're non-resident. Contributions still get tax relief if you're a UK taxpayer, but relief stops once you're non-resident. Accessing the pension before age 55 (rising to 57) incurs UK tax and penalties. State Pension eligibility depends on National Insurance contributions — see our guide to how State Pension works.

How much does it cost to file taxes as an expat? If you're employed, you might be able to self-file using tax software (£0–£300 depending on complexity). If you're self-employed or dealing with complex cross-border income, a tax accountant (£500–£2,000+) is often worth it to avoid mistakes that attract penalties.

Is there a visa or tax residency benefit if I'm a digital nomad or remote worker? Many countries (Portugal, Malta, Greece, Singapore) offer preferential tax regimes for remote workers and expats, with 10–15 year holidays on foreign income tax. However, "digital nomad visas" don't automatically grant tax residency; you need to actually be resident to claim the benefit. Check whether your destination country recognizes digital nomads and what the real tax saving is.

Can I use a salary calculator if I'm working abroad? Our UK and US salary calculators assume you're tax resident in those countries. If you're non-resident but working for a UK or US employer, your tax treatment might differ. Use the calculators as a starting point, then refine with a tax advisor for your specific country.

What's the easiest country to work abroad as a UK expat? From a tax perspective, Australia, Canada, and New Zealand offer straightforward tax systems and UK double taxation treaties. UAE and Singapore have low or no personal income tax. The EU (France, Germany, Spain) has higher taxes but strong social security. Cost of living, visa requirements, and language are equally important — lowest tax doesn't mean best move.

Take Action

Working overseas doesn't mean avoiding tax — it means understanding which country taxes you and planning accordingly. Spend an hour reading your host country's tax residency rules and the relevant double taxation treaty. Then run your salary through a tax calculator for your destination. If the numbers are complex, a tax accountant's £600 fee now saves you thousands in mistakes or missed deductions later.

Head to our UK salary calculator or US salary calculator to see your exact take-home in your current or future location.