United Kingdom · Tax & Finance

UK tax for expats:
PAYE, National Insurance, and the numbers.

Become UK tax resident and the UK taxes your worldwide income. But new arrivals get something Portugal and Spain don't offer: four tax years with no UK tax on foreign income and gains. Here's how it works in 2026/27 — and what you keep owing back home, whether you're coming from the US, Canada, or Australia.

Figures verified 3 July 2026
The key numbers · 2026/27
  • Tax residency trigger: 183+ days in a tax year — automatic, under the Statutory Residence Test
  • Income tax (England/Wales/NI): 20% / 40% / 45%; personal allowance £12,570, frozen to April 2031
  • FIG regime: 4 tax years with no UK tax on foreign income and gains for qualifying new arrivals
  • Foreign pension income: taxed at UK progressive rates (20–45%) — treaty determines what's taxed where
  • Inheritance tax: 40%; worldwide assets in scope once you've been resident 10 of the last 20 tax years
  • New State Pension: £241.30/week (2026/27) · US FEIE 2026: US $132,900 · FBAR trigger: US $10,000
  • Roth IRA: treaty-protected in the UK — qualified distributions exempt (US–UK Exchange of Notes)

Are you UK tax resident?

The Statutory Residence Test decides. Spend 183 or more days in the UK in a tax year and you're automatically resident. Fewer than 16 days and you're automatically not (46 if you were non-resident for the prior three years). In between, a "sufficient ties" test counts your connections — home, family, work — against your day count (HMRC RDR3). Most people who move here full-time are resident from arrival. Plan on it.

2026/27 income tax bands

These are the rates for England, Wales and Northern Ireland (HMRC):

Taxable income (above allowance)BandRate
Up to £12,570Personal allowance0%
£12,571 – £50,270Basic20%
£50,271 – £125,140Higher40%
Above £125,140Additional45%

The personal allowance is frozen at £12,570 until April 2031 (Autumn Budget 2025), and tapers away £1 for every £2 of income over £100,000 — it's gone entirely at £125,140.

Scotland sets its own income tax. Six bands in 2026/27: 19%, 20% and 21% at the bottom, then 42% from £43,663, 45% from £75,001, and a 48% top rate (mygov.scot). If you're weighing Edinburgh against England, run both sets of numbers.

The FIG regime: four tax-free years

This is the UK's big draw for new arrivals. Since 6 April 2025 (it replaced the old "non-dom" rules), anyone who has been non-UK-resident for 10 consecutive years can elect, for their first four tax years of residence, to pay no UK tax on foreign income and gains — pensions, dividends, interest, capital gains arising outside the UK (HMRC). Nearly every genuinely new arrival passes the 10-year test.

The mechanics: you claim year by year through Self Assessment, and the claim deadline is 31 January in the second year after the tax year ends — a 2026/27 claim is due by 31 January 2029 (HMRC HS266). Claiming costs you that year's personal allowance and capital gains exempt amount — usually a trivial price against four years of sheltered foreign income. UK-source income (a UK salary, UK rent) is taxed normally throughout.

Use the window deliberately. Four years of UK-tax-free foreign gains is a planning opportunity — for realising gains, restructuring, or drawing down accounts. Americans note: the IRS taxes you regardless. The FIG regime removes the UK layer, not the US one.
Your pension & retirement income

How the UK taxes the money you've already earned.

The UK taxes foreign pension income at progressive rates (20–45%) as pension income. But the treaty with your home country determines who taxes what — and the FIG regime can shelter foreign pensions entirely for your first four years. Pick where your pension comes from.

Where is your pension from?
Key numbers · US pension in the UK · 2026
  • Treaty: US–UK Convention (2001) · full text (US Treasury)
  • Social Security: taxable only in the UK (Art. 17(3)) — the saving clause exception means the US genuinely stops taxing it
  • WEP repealed: Social Security Fairness Act (Jan 2025) — a UK State Pension no longer reduces your US Social Security
  • 401(k) / Traditional IRA: taxable in the UK as pension income; US citizens file 1040 + FTC
  • Roth IRA: treaty-protected — qualified distributions exempt in the UK under the Exchange of Notes
  • Lump sums: HMRC changed position March 2025 — now asserts UK tax on US plan lump sums (DT19853)
  • Government & military pensions: taxable only in the US (Art. 19)

Social Security — taxable only in the UK

Article 17(3) of the US–UK treaty gives the UK exclusive taxing rights on US Social Security once you're UK resident. Crucially, Social Security is listed as a saving-clause exception (Art. 1(4)), which means the US genuinely surrenders its right to tax — unlike most other pension provisions, where the US retains the right to tax its citizens regardless. The practical result: US Social Security is taxed only in the UK at progressive rates, and you report it on your UK Self Assessment return.

This is one of the most favourable Social Security treaty provisions anywhere. In most countries (Portugal, Spain, France), the US retains at least a partial right to tax.

WEP is dead — UK State Pension no longer reduces US Social Security

The Windfall Elimination Provision was repealed by the Social Security Fairness Act, signed 5 January 2025 (retroactive to January 2024). A UK State Pension — or any other foreign pension based on non-covered employment — no longer reduces your US Social Security benefit. SSA completed adjustments for over 3.1 million beneficiaries by mid-2025. If you were previously affected, check your benefit statement.

The Government Pension Offset (GPO) was also repealed in the same Act. If your spouse's Social Security benefit was previously reduced because you receive a UK government pension, that offset is gone too.

401(k) and Traditional IRA withdrawals

Article 17(1) treats periodic pension distributions as taxable in the UK. But the treaty's saving clause (Art. 1(4)) preserves the US right to tax its own citizens on the same income. The practical result: the UK taxes at progressive rates (20–45%), the US also taxes it on your 1040, and you claim a Foreign Tax Credit on whichever side has the lower bill.

UK rates at typical retirement income levels (£30,000–£80,000) generally exceed US effective rates, so the FTC usually eliminates US tax entirely — but you still file. The FIG regime can remove the UK layer entirely for your first four years (see below).

Roth IRA — treaty-protected in the UK

This is where the UK stands out. The US–UK treaty's Exchange of Notes explicitly lists Roth IRAs (section 408A plans) as covered pension schemes. Under Article 18(1), distributions from a covered scheme that would be exempt in the country where the scheme is established are also exempt in the other country. Since qualified Roth distributions are tax-free in the US, the UK must also treat them as exempt.

This makes the UK one of the best countries in the world for Americans with Roth accounts — Portugal, Spain, France, and most other countries don't recognise the Roth wrapper at all and tax the growth at full progressive rates.

The accumulation phase too: Article 18(1) also provides that income accruing within the Roth IRA is not taxed in the UK until (and to the extent) a distribution is made. Growth inside the Roth is sheltered from UK tax while it stays in the account — the same treatment as in the US.

Lump sums — the March 2025 bombshell

HMRC changed its position on 12 March 2025. Updated guidance (DT19853) now asserts UK tax on lump-sum distributions from US pension plans paid to UK residents, with credit for any US tax paid. Previously, lump sums were widely understood to be exempt from UK tax under the treaty. The estimated uplift in global tax liability is 8–11% of the lump sum. This is actively contested by practitioners.

The mirror problem also exists: the IRS may not fully respect the UK's 25% Pension Commencement Lump Sum as tax-free for US citizens. Both directions are now uncertain ground. Do not take any lump sum — from a US plan or a UK plan — without cross-border specialist advice.

Government and military pensions

Article 19 gives the US exclusive taxing rights on government pensions — FERS, CSRS, military retirement pay, state and local government pensions. The UK cannot tax them. You still declare them on your UK Self Assessment return, but no UK tax is due.

Exception: if you hold both US and UK nationality, the exclusion does not apply — the pension is taxable in both states, with credit relief.

The FIG regime — four tax-free years for US pensions

If you've been non-UK-resident for at least 10 consecutive tax years, the FIG regime exempts your foreign income — including US pension income — from UK tax for your first four tax years of UK residence. US pension withdrawals, Social Security, and investment income from the US all qualify as foreign income.

The trade-off: claiming FIG costs you the £12,570 personal allowance and the £3,000 CGT annual exempt amount for that year. On any meaningful US pension income, the trade-off is overwhelmingly positive. But note: US citizens still owe US tax on everything, FIG or not — the regime removes the UK layer, not the US one.

ISAs — the PFIC trap for Americans

The IRS doesn't recognise the ISA wrapper. Income inside is US-taxable, and pooled funds held within an ISA are PFICs — Passive Foreign Investment Companies. Form 8621 is required for each PFIC, and the default tax treatment is punitive (the "excess distribution" method). US persons generally avoid non-US pooled funds altogether, ISAs included.

Workarounds: cash ISAs (no PFIC issue with cash); direct shareholdings in individual stocks (not PFICs); or simply don't use ISAs and invest through US-based accounts. Get advice before opening any UK investment wrapper.

What you still owe the US — the full picture

ObligationDetail
Annual filingYes — forever. Form 1040 required annually regardless of where you live.
FEIEUS $132,900 for 2026 — but does not apply to pension income. Only earned income qualifies.
Foreign Tax CreditForm 1116. UK tax paid credits against US tax on the same income. The primary relief mechanism for retirees.
FBARFinCEN Form 114 if foreign accounts exceed US $10,000 aggregate at any point. Due April 15 (auto-extension to Oct 15).
FATCAForm 8938 if foreign assets exceed US $200,000 year-end (single, living abroad) or US $300,000 at any point. MFJ: US $400k/US $600k.
TotalizationUS–UK agreement since 1985. Prevents double social security contributions; allows combining NI and SS credits for benefit eligibility.

Sources — US pensions

  1. US–UK Income Tax Convention (US Treasury), Articles 17, 18, 19, and saving clause (Art. 1)
  2. HMRC lump-sum guidance: DT19853; Roth treatment: DT19876A
  3. WEP repeal: Social Security Fairness Act (SSA)
  4. FIG regime: HMRC HS266
  5. FEIE 2026: IRS.gov; FBAR; FATCA
  6. US–UK Totalization Agreement (SSA)
This section is general information, not tax advice. Cross-border pension taxation is personal — the interaction between treaties, domestic law, pension type, timing, and your individual circumstances means no two situations are identical. Engage a professional licensed in both countries before triggering residency or drawing down any retirement account.

Investments: CGT, dividends, savings, ISAs

Income typeAllowance (2026/27)Rate
Capital gains£3,000 exempt amount18% basic-rate / 24% higher-rate (HMRC)
Dividends£500 allowance10.75% / 35.75% / 39.35% — basic and higher rates rose 2 points on 6 April 2026 (HMRC)
Savings interest£1,000 basic / £500 higher / nil additionalIncome tax rates; savings and property rates rise 2 points from April 2027 (announced, pending)
ISA£20,000/yrTax-free in the UK. From 6 April 2027 the cash-ISA portion is capped at £12,000 for under-65s — 65+ keep the full £20,000 (HM Treasury)
The US-person ISA trap. The IRS doesn't recognise the ISA wrapper: income inside is US-taxable, and pooled funds held inside are PFICs — Form 8621 and punitive tax treatment. US persons generally avoid non-US pooled funds altogether, ISAs included. Cash ISAs and direct shareholdings are the usual workarounds; take advice first.

Inheritance tax: the 10-year clock

Since 6 April 2025 IHT is residence-based. Once you've been UK resident for 10 of the last 20 tax years you're a "long-term resident" and your worldwide estate is in scope. Before that, only UK assets are. The rate is 40% above the nil-rate band of £325,000 plus the £175,000 residence band — roughly US $660,000 combined, both frozen to April 2031 (HMRC). Leave the UK later and an "IHT tail" follows you for 3–10 years.

The planning window: a 60-year-old arriving in 2026 has roughly 10 years before their worldwide estate enters UK IHT scope. That's a long runway — but only if you use it. Estate planning done in year one is worth far more than estate planning done in year nine.
In this section

Guides

On this page

How the UK taxes your US retirement income

Social Security, IRAs, 401(k)s, Roths, and the lump-sum problem — what's settled and what's contested.

Read now →
Coming soon

The FIG regime, year by year

Who qualifies, what a claim costs you, and how to use four tax-free years deliberately.

Coming soon

Inheritance tax for new arrivals

The 10-of-20-years rule, the frozen bands, and the planning moves that only work early.

Sources

  1. Statutory Residence Test: HMRC RDR3
  2. Income tax rates: GOV.UK; Scotland: mygov.scot
  3. FIG regime: GOV.UK eligibility; HMRC HS266
  4. US side: US–UK treaty (Art. 17); HMRC DT19876A; lump sums: HMRC DT19853; FEIE (IRS); FATCA (IRS)
  5. Canada side: HMRC DT4610; OAS abroad (Canada.ca); departure tax (CRA); no totalization (Canada.ca)
  6. CGT, dividends, ISAs: GOV.UK CGT; GOV.UK dividends; ISA reform factsheet
  7. Inheritance tax: GOV.UK long-term resident; GOV.UK IHT
  8. State Pension & totalization: GOV.UK; SSA; WEP repeal: SSA
This page is general information, not tax advice. Cross-border taxation is personal — engage a professional licensed on both sides before acting. Dollar figures use GBP/USD ≈ US $1.32 (1 July 2026); rates fluctuate daily.
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