Moving on from Britain without moving home

Figures relate to tax year 2025-26 (UK) · 2025 (US)

You have had enough of Britain, and America is not where you are going. Dubai, Singapore, Lisbon, somewhere else entirely.

Leaving the UK ends one tax system and leaves the other exactly where it was, because America follows the passport.

What changes most is the thing nobody mentions: the British tax you were crediting against your American bill disappears with you.

Key takeaways

• British residence ends on the rules, not on the removal van.
• Your American filing duty continues unchanged for ever.
• A country with no income tax leaves nothing to credit.
• The earnings exclusion often becomes your only relief.
• Housing costs in the new country may still help.
• Social security contributions need checking separately.
• British assets can stay taxable here after you go.
• The year of the move is the hardest one to file.

When does leaving the UK end your residence?

When the statutory tests say so, which turns on days and ties rather than intention. According to GOV.UK guidance on the residence test, you can split the year where you genuinely leave to live or work abroad. Booking a flight does not decide it.

Our guide to the statutory residence test covers the tests.

Count your return visits carefully after you go.

Does leaving the UK stop your US filing?

Never, and this surprises people who thought Britain was the complicated half. The United States taxes its citizens wherever they live, so the same return is due from Dubai as from Durham. Only the reliefs available change.

Our guide to US filing thresholds for expats covers who must file.

Nothing about leaving Britain reaches the IRS at all.

What happens to your foreign tax credit?

It shrinks or vanishes, depending where you go. The credit relieves American tax by the foreign tax you paid, so a country charging nothing gives you nothing to claim. People moving to the Gulf discover this in their first April there.

Our guide to Form 1116 income baskets covers the credit.

In our practice this is the shock that catches everybody.

So what relief is left?

The earnings exclusion, mainly, and it has a ceiling. It removed up to $130,000 of foreign earnings for 2025, which covers a modest salary entirely and a large one only partly. Above that figure you pay American tax with nothing to offset it.

Our guide to Form 2555 and the exclusion covers the claim.

A high earner in a nil tax country pays America in full above the cap.

Where you go changes the answer

Does the housing exclusion still work?

Yes, and it matters more than it did here. The housing figure is adjusted for expensive cities, and several of the places Americans move to from Britain carry high limits. On a large rent that relief is worth real money.

Our guide to the housing exclusion in London covers the mechanics.

Check the city limit for the specific place you move to.

A worked example

Take an illustrative case. An American leaves London for Dubai on a package worth considerably more than the exclusion cap.

In Britain she paid tax at 45% and credited almost all of it against her American bill.

In Dubai she pays no local tax, so the credit disappears entirely.

Her take home rises sharply, and her American bill rises too, because nothing now offsets the tax above the exclusion.

What about social security?

The agreement between Britain and America stops applying when you leave, and the new country may have no agreement at all. An employee of an American company can end up paying American social security on top of everything else. Check before you sign.

Our guide to a certificate of coverage covers the British arrangement.

Self-employment abroad is where this bites hardest.

Do British taxes follow you after leaving the UK?

Some do. Rental income from a British property stays taxable here, British land remains within inheritance tax whoever owns it, and certain gains can be caught if you return within a few years. The passport does not have to be British for any of that.

Our guide to the non-resident landlord scheme covers letting from abroad.

Property is the usual reason somebody keeps filing here.

What about temporary non-residence?

Britain has rules that reach back if you return within five years, taxing certain income and gains realised while you were away. Somebody planning a short stint abroad before coming back needs to know about them in advance.

Our guide to UK capital losses for US citizens covers the gains side.

Five years is the period to count against.

Should you sell before leaving the UK?

Sometimes, and the timing is a genuine decision. Selling while still resident uses British reliefs you lose afterwards, and selling later may escape British tax altogether on some assets. America taxes the gain either way.

Our guide to the 60-day CGT report covers property sales.

Model both timings before fixing a completion date.

What happens to your pension here?

It stays where it is and keeps growing, and drawing it later depends on where you then live. A country with no treaty may tax the payments without any relief, which is a reason to think hard before transferring anything.

Our guide to the overseas transfer charge covers moving a pot.

Leaving the pension in Britain is usually the safe default.

Does the new country have a treaty?

Check before you go, because it shapes everything. America has treaties with many countries and not with all of them, and the Gulf states largely sit outside the network. Without one there is no tie breaker and no reduced withholding.

Our guide to the treaty tie breaker covers dual residence.

No treaty means no relief beyond the ordinary credit.

Do you tell HMRC you are going?

Yes, and the form matters. Telling HMRC you have left triggers the split year treatment and often a refund of tax overpaid through payroll. People who simply stop filing leave money behind and an open record.

Our guide to split year treatment covers the year of the move.

Do it in the year you leave, not years later.

What about your UK bank accounts?

Many banks close accounts for non-residents, and an American address makes it worse. Keeping a British account open is easier while you are still here, so sort it before the move rather than afterwards. Interest remains reportable to America.

Our guide to UK bank account closures covers the problem.

Tell the bank your new address honestly.

Does leaving the UK change your FBAR?

Only the accounts on it. You will open accounts in the new country and perhaps close some here, and the filing continues on the same threshold throughout. The duty follows you from country to country without a break.

Our guide to FBAR signature authority covers the rules.

List every account you held at any point in the year.

What about state tax?

A state you never properly left can follow you to a third country as easily as to Britain. The argument that you severed ties is the same one, and moving twice without ever addressing it makes the position harder to explain.

Our guide to state tax for expats covers the stubborn states.

Deal with it on the first move rather than the second.

Is renouncing worth considering?

It comes up more often among people in nil tax countries, because the American bill is suddenly visible rather than hidden behind a credit. It is a serious and irreversible step with its own exit charge. Nobody should decide it in a first year abroad.

Our guide to renouncing US citizenship covers the process.

Get the filings current before even looking at it.

How does the year of the move file?

Messily, because Britain splits its year and America does not. One American return covers the whole calendar year across two countries of residence, with reliefs apportioned. That year is the one most worth paying somebody to get right.

Our guide to the UK tax year difference covers the mismatch.

Keep payslips from both countries in one folder.

Does the exclusion survive the move?

The relief does, and your qualifying period may not. Both tests for it depend on time spent abroad, and a move between two foreign countries generally preserves them while a trip through America can break the day count.

Our guide to the first year choice election covers part years.

Route the move without a long American stopover.

What records should you keep?

Your departure form, the date you left, flight records, the new tenancy or employment contract, and payslips from both countries. Those five prove when British residence ended, which is the question everything else depends on.

Our guide to exchange rates on a US return covers converting the figures.

Keep boarding passes for the year of the move.

Does your employer handle any of this?

Rarely, and a relocation package is not tax advice. Big employers sometimes fund a year of filings, which helps with the mechanics and not with the planning. The decisions that matter happen before you sign.

Our guide to a US secondment and tax covers employer moves.

Ask whether tax equalisation forms part of the offer.

What is tax equalisation worth?

A great deal to an American moving somewhere with no income tax. Under it the employer bears the difference so you keep a notional home country position, which protects you from the very bill this article describes. Few packages include it.

Our guide to shadow payroll arrangements covers the payroll side.

A gross up clause is worth more than a signing bonus here.

Can you keep working for a UK employer?

Often, and the payroll position needs sorting. A British employer paying somebody who now lives abroad may stop deducting British tax, which is right, and the new country may want its own. Both sides need telling where you are.

Our guide to working remotely for a US employer covers remote arrangements.

A wrong payroll setup costs a year of reclaims.

What about a British company you own?

It carries on being British, wherever you move. Where the company is managed from can matter for its own residence, so a sole director leaving Britain raises questions about the company as well as themselves. Take advice on both.

Our guide to a UK group's US subsidiary covers corporate structures.

Board meetings held abroad can move a company's residence.

Does your ISA survive?

You keep what is in it and cannot add more once you stop being resident. For an American the wrapper never worked anyway, so little is lost. The underlying investments still need reporting to the IRS every year.

Our guide to ISA alternatives for Americans covers the problem.

Moving abroad is a reasonable moment to unwind one.

What if the new country taxes worldwide income?

Then you are back to a familiar three way position, and the credit returns. Portugal, Spain and most of Europe work like Britain in this respect. The mechanics will feel recognisable even though the rates differ.

Our guide to the US-UK tax treaty covers how a treaty helps.

Check whether the destination taxes foreign income at all.

Do you need to file in Britain again?

Only if British income continues, which for most people means property or a pension. Somebody with neither usually files a final return and nothing after it. The filing stops when the income does.

Our guide to registering for Self Assessment covers the British return.

Ask HMRC to close the record once nothing is left.

How early should you plan?

Three months before the move, and ideally before you accept the job. Most of the useful decisions, including asset sales and pension choices, have to happen while you are still British resident. Afterwards you are reporting rather than planning.

Our guide to moving back to the US covers the other direction.

The weeks before departure are the valuable ones.

What if you move again after a year?

Each move resets the local position and leaves the American one untouched. Serial movers end up with several part years and several sets of records, which is manageable with discipline and miserable without it. The exclusion tests also need recounting each time.

Our guide to the accidental American covers citizenship questions.

Keep one folder per calendar year, not per country.

How to plan for leaving the UK

1. Check whether the destination taxes income at all.
2. Work out what credit you will lose and what it costs you.
3. Model the exclusion against your actual package.
4. Check the housing limit for the specific city.
5. Confirm whether a social security agreement exists.
6. Decide whether to sell British assets before or after.
7. Tell HMRC you are leaving and claim any refund.
8. Keep both countries' payslips for the year of the move.

Mistakes and penalties we see when leaving the UK

The first is budgeting on a nil tax salary without noticing that the American bill is no longer covered by a credit.

The second is never telling HMRC, which forfeits a refund and leaves the British record open.

The third is transferring a British pension abroad in a hurry and triggering charges that staying put would have avoided.

The fourth is returning within five years and meeting the temporary non-residence rules nobody mentioned.

How US UK Tax Accountants helps

We model the destination before the move, because the credit you lose is usually worth more than the salary increase that prompted the decision.

Then we close the British position properly. Our US federal returns service covers the filing that continues.

If an offer has arrived from somewhere outside Britain and America, get in touch before you accept it.

Last reviewed 29 October 2026. This article is general information and not personal tax advice, and destination rules vary widely.