US Social Security While Living in the UK: Who Taxes It?

If you live in the UK and receive US Social Security, the US-UK tax treaty gives the UK the sole right to tax it: Article 17(3) says social security payments made by one country to a resident of the other "shall be taxable only in that other State". The protection extends to US citizens living in the UK, because the treaty's saving clause expressly preserves Article 17(3), and IRS Publication 915 confirms that US citizens resident in the UK are exempt from US tax on their benefits. The UK then taxes the benefit in full as foreign pension income, at your normal Income Tax rates.

Key takeaways

UK resident, US Social Security: taxable only in the UK under treaty Article 17(3), whether you are a US citizen or a British national.
US citizens are covered too. The saving clause (Article 1(4)) lets the US tax its citizens as if the treaty did not exist, but Article 1(5)(a) carves out Article 17(3), so the exemption survives.
The UK taxes the full amount. The old 10% deduction for foreign pensions ended on 6 April 2017; the whole payment is now taxable, converted to sterling.
Withholding: non-US persons face 30% US tax on 85% of benefits (25.5% of each payment) unless they qualify for the treaty exemption, which UK residents do. SSA does not withhold from US citizens at all.
The reverse applies. A UK State Pension paid to a US resident is taxable only in the US under the same article, and the UK pays yearly increases to State Pensioners living in the USA.
Work records can be combined. The US-UK Totalization Agreement lets each country count the other's contributions to meet minimum eligibility rules, and the Social Security Fairness Act has ended the WEP reductions that used to hit people with foreign pensions.

What the treaty actually says

The US-UK income tax treaty (signed in 2001) deals with pensions and social security in Article 17. Three parts matter here:

Article 17(1)(a) gives private and occupational pensions to the country of residence of the person who beneficially owns them.
Article 17(2) carves out lump sums: a lump sum from a pension scheme established in one country, paid to a resident of the other, is taxable only in the country where the scheme is established.
Article 17(3) covers state benefits: "payments made by a Contracting State under the provisions of the social security or similar legislation of that State to a resident of the other Contracting State shall be taxable only in that other State."

HMRC's treaty guidance calls this "exclusive residence-country taxation of social security benefits": the paying country gives up its right to tax, and your country of residence taxes instead.

"Resident" means resident for treaty purposes. If both countries treat you as resident, for example in the year you move, the Article 4 tie-breaker (permanent home, centre of vital interests and so on) decides. Our guide to how the US-UK treaty prevents double tax walks through the tie-breaker.

Why US citizens in the UK are protected: the saving clause

Article 1(4), the saving clause, allows the US to "tax its residents ... and by reason of citizenship may tax its citizens, as if this Convention had not come into effect." Without anything more, a US citizen in London would still pay US tax on Social Security.

Article 1(5)(a) is the exception. It says the saving clause "shall not affect" benefits conferred under several provisions, including "sub-paragraph b) of paragraph 1 and paragraphs 3 and 5 of Article 17". Article 17(3) is on that list, so it overrides citizenship-based taxation.

The IRS says the same thing. Under "U.S. citizens residing abroad", Publication 915 (2025) states that US citizens who are residents of certain listed countries "are exempt from U.S. tax on their benefits", and the United Kingdom is on that list alongside Canada, Egypt, Germany, Ireland, Israel, Italy and Romania.

Two practical points follow:

1. You still file a US return. Citizenship-based filing does not go away. Your Social Security is exempt, but your other income is still reported, and the exemption depends on a treaty position, so a licensed CPA or Enrolled Agent should review and sign off on how it is shown.

2. The exemption applies only to Social Security. A 401(k), IRA or private pension follows Article 17(1) and (2) and the saving clause, with different results for US citizens.

How the UK taxes US Social Security

Once the treaty gives the UK the taxing right, UK law decides how much to tax. HMRC's Employment Income Manual explains that a foreign social security benefit that is also a pension is treated as a foreign pension under Part 9 Chapter 4 of ITEPA 2003, not as a taxable foreign benefit. US retirement and survivors' benefits fall into this category in practice.

The key rules, verified against HMRC guidance:

The full amount is taxable. HMRC's manual on foreign pensions confirms that "from 6 April 2017 the taxable amount is full amount of the payment arising in the tax year". Before that date only 90% was taxable. Older articles still quote the 10% deduction, and it no longer applies.
Liability depends on UK residence. HMRC notes that liability to tax "arises only if that recipient is UK resident."
It is reported through Self Assessment. There is no UK PAYE on a US Social Security payment, so the income goes on your return as foreign income. Convert each payment to sterling using a consistent, reasonable exchange-rate method.
Normal rates apply. For 2026-27, gov.uk shows a £12,570 Personal Allowance, 20% basic rate to £50,270, 40% higher rate to £125,140 and 45% above that (Scotland has different bands).

New UK residents: the FIG regime

Since 6 April 2025, people in their first four years of UK residence after at least ten consecutive tax years of non-UK residence can claim the 4-year foreign income and gains (FIG) regime. HMRC's manual lists both "foreign pension income" and "foreign social security benefits" as qualifying foreign income. A claim is made on the Self Assessment return year by year, and you can choose which foreign income to claim on.

Claiming has costs. According to gov.uk, you lose your tax-free allowances for Income Tax and Capital Gains Tax. For a retiree living mainly on Social Security, that trade-off often does not pay, so model it before claiming.

US withholding: who has it and how to stop it

SSA, acting as the IRS's withholding agent, says that for a nonresident alien it "will withhold a 30 percent flat tax from 85 percent of those benefits unless you qualify for a tax treaty benefit. This results in a withholding of 25.5 percent of your monthly benefit amount."

How this plays out for UK residents:

| Recipient living in the UK | US withholding by SSA | Why |

|---|---|---|

| US citizen | None | SSA does not withhold from US persons |

| Green card holder | None; refund route if withheld in error | Treated as a US person; Pub 54 explains the Form 1040 refund route. Take advice before relying on any treaty position |

| Non-US person (e.g. British spouse or survivor) | None once the treaty exemption is recorded | The UK treaty is on SSA's list of treaties that exempt benefits from withholding |

| Non-US person, exemption not recorded | 25.5% of each payment | Default nonresident alien withholding |

SSA's screening tool lists the United Kingdom among the countries whose treaties "exempt Social Security benefits paid to residents of these countries from nonresident alien tax withholding", and says SSA "will not withhold nonresident alien tax from your benefits if you qualify". The route is to contact Social Security: from the UK, that means the Federal Benefits Unit at the US Embassy in London, and you will need to confirm your UK residence. Each January SSA issues Form SSA-1042S (non-US persons) or SSA-1099 (US persons) showing benefits and any tax withheld.

If tax was withheld before the exemption was recorded, raise it with SSA first.

Getting paid in the UK

Non-US citizens do not lose their benefits by living in the UK: SSA's operating manual confirms that under the US-UK Totalization Agreement, certain non-US citizen beneficiaries living in the UK are exempt from the rule that would otherwise suspend benefits after six months outside the US.

The United Kingdom is on SSA's International Direct Deposit list. Payments can go to a UK bank account, converted into sterling, or to a US account. SSA publishes a dedicated UK sign-up form (SSA-1199).

The reverse case: UK State Pension paid to a US resident

Article 17(3) works in both directions. A UK State Pension paid to someone resident in the US is taxable only in the US. The UK does not tax it, and you do not claim a UK tax credit for it.

How the US taxes it is less clear-cut. Publication 915 says that under the treaties with Canada and Germany, those countries' social security benefits are treated "as if they were paid under the social security legislation of the United States", which would make only part of them taxable. The UK is not named in that sentence. Publication 54 only says that benefits similar to social security received from other countries "may be taxable" and points you to the treaty. How much of a UK State Pension to include is therefore a judgement for your preparer to make deliberately.

Two better-known points are firmly settled:

Your UK State Pension increases every year. gov.uk's list of countries where it pays an annual increase includes the USA. Unlike retirees in Canada or New Zealand, where gov.uk says increases are not paid, US residents receive the yearly uprating.
You can be paid in the US. gov.uk says State Pension can be paid to a bank in your country of residence (a 0.39% conversion charge applies before payment) or to a UK account, every 4 or 13 weeks.

For UK workplace pensions and SIPPs, a different set of rules applies. See moving a UK pension to the US.

Benefit, residence and taxing country at a glance

|---|---|---|---|---|

Lump sums need their own advice: HMRC's treaty notes confirm that the US can tax lump sums received by US citizens from UK schemes, even though the treaty would otherwise leave them with the UK.

Combining US and UK work records (totalization)

The US-UK Totalization Agreement does two jobs. While you work, it stops you paying into both systems at once (covered in which country's social security you pay). At retirement, it lets short careers in each country add up.

US benefits: SSA says that if you lack enough US credits, you may qualify for a partial US benefit counting UK periods, but "you must have earned at least six credits (generally one and one-half years of work) under the U.S. system." If you already qualify on US credits alone, UK credits cannot be added.
UK State Pension: you usually need 10 qualifying years on your National Insurance record. gov.uk says time contributing in an agreement country "can be added to the qualifying years" to reach that minimum, but "the amount you actually get paid will only be based on the qualifying years in your UK National Insurance record." SSA's summary adds that at least one year of UK coverage is needed for US credits to count.

Totalization helps you qualify; it does not increase the amount.

WEP and GPO are gone: the Social Security Fairness Act

The Windfall Elimination Provision (WEP) used to reduce the US benefit of someone who also drew a pension from work not covered by US Social Security, such as a UK State Pension, and the Government Pension Offset (GPO) cut spousal and survivor benefits in similar cases.

The Social Security Fairness Act has ended both. SSA's update page (last updated 21 July 2025) says the Act helps, among others, "people whose work had been covered by a foreign social security system", and that WEP and GPO no longer apply to benefits payable for January 2024 and later. SSA began adjusting payments on 25 February 2025 and paid lump sums covering the increase back to January 2024.

If you never claimed a spousal or survivor benefit because of the GPO, SSA says you may need to file an application, and the application date can affect when benefits start.

Worked example (illustrative)

Figures are illustrative only. The exchange rate is assumed for arithmetic, and the tax rates are the 2026-27 rates for England, Wales and Northern Ireland published on gov.uk.

Margaret is a US citizen who has lived in Manchester for twelve years. She receives US Social Security of $2,000 a month ($24,000 a year) and a UK workplace pension of £20,000 a year taxed under PAYE. She has no other income.

US tax on her Social Security: nil. She is a UK resident US citizen, so Pub 915 and treaty Article 17(3) exempt the benefit. SSA withholds nothing because she is a US person. She still files a Form 1040 reporting her worldwide income.
UK taxable amount: the full $24,000. At an assumed $1.33 to £1, that is about £18,045. No 10% deduction.
UK Income Tax: total income £38,045. After the £12,570 Personal Allowance, £25,475 is taxed at the 20% basic rate: about £5,095. Around £3,609 of that relates to the Social Security (£18,045 × 20%), and it is paid through Self Assessment rather than PAYE.

Her husband, David, a British citizen who has never been a US person, receives a US spousal benefit of $800 a month. Until his UK residence is recorded with SSA, 25.5% is withheld: $204 a month, or $2,448 a year. Once the treaty exemption is applied, withholding stops. The UK taxes his benefit in full through Self Assessment, just as it does Margaret's.

Step by step: putting your benefits on the right footing

1. Confirm your treaty residence each year, especially the year you move. Our residency service covers split-year and tie-breaker questions.

2. Check SSA's records. If you are not a US person, ask the Federal Benefits Unit in London to record your UK residence for the treaty exemption.

3. Choose how to be paid: UK direct deposit in sterling via the SSA-1199 UK form, or a US account.

4. Register for Self Assessment and report the benefit each year as foreign pension income.

5. Keep your statements (SSA-1099 or SSA-1042S) and a record of the exchange rates you used.

6. Show the treaty exemption properly on Form 1040 if you are a US citizen.

7. Review the FIG regime in your first four years of UK residence, weighing the loss of allowances.

8. Plan claims across both systems, using totalization and the Fairness Act changes where they help.

Common mistakes

Paying US tax on Social Security as a UK resident US citizen. The saving clause does not reach Article 17(3).
Leaving it off the UK return. No US tax does not mean no tax.
Applying the old 10% deduction. It ended on 6 April 2017.
Tolerating 25.5% withholding. Non-US spouses and survivors resident in the UK qualify for the treaty exemption once SSA records it.
Treating a UK pension lump sum like Social Security. Article 17(2) and the saving clause give US citizens a different answer.
Claiming FIG relief by default when losing the Personal Allowance costs more.
Not revisiting WEP or GPO decisions made under rules that no longer apply.

When to get professional help

Where there is a US citizen in the household, a non-US spouse drawing US benefits, a recent move, or pension lump sums alongside Social Security, the treaty positions interact and mistakes tend to repeat every year. Our US-UK expat tax team prepares both returns together. A licensed CPA or Enrolled Agent reviews and signs off the US side, and an ACCA-qualified accountant reviews the UK side. If you would like us to look at your position, you can book a consultation. This article is general information, not advice for your circumstances.

Sources

Frequently asked questions

Is US Social Security taxable in the UK?+

Yes. Under Article 17(3) of the US-UK tax treaty, social security paid by one country to a resident of the other is taxable only in the country of residence, so a UK resident is taxed by the UK. HMRC treats US retirement benefits as foreign pension income, and since 6 April 2017 the full amount is taxable, with no 10% deduction. It is reported through Self Assessment, converted to sterling, and taxed at your normal Income Tax rates.

Do US citizens living in the UK pay US tax on Social Security?+

No. The treaty's saving clause in Article 1(4) normally lets the US tax its citizens as if the treaty did not exist, but Article 1(5)(a) expressly preserves Article 17(3). IRS Publication 915 confirms that US citizens who are residents of the United Kingdom are exempt from US tax on their benefits. They must still file a US return reporting their other income, and the exemption should be shown correctly by a licensed preparer.

Will SSA withhold 25.5% from my benefits if I live in the UK?+

Only if you are a nonresident alien and the treaty exemption has not been recorded. SSA withholds 30% of 85% of benefits (25.5% of each payment) from nonresident aliens unless a treaty applies, and the UK treaty is on SSA's list of treaties that exempt benefits from this withholding. SSA does not withhold from US citizens. Non-US spouses or survivors living in the UK should contact the Federal Benefits Unit in London to have their UK residence recorded.

Is the UK State Pension taxed in the US if I live in America?+

Under treaty Article 17(3), a UK State Pension paid to a US resident is taxable only in the US, and the UK does not tax it. How much is taxable under US law is less settled: IRS Publication 915 treats Canadian and German social security like US Social Security by treaty, but does not name the UK. Publication 54 says foreign social-security-type benefits may be taxable, so the amount to include is a judgement for your preparer.

Does the UK State Pension go up each year if I live in the USA?+

Yes. gov.uk's list of countries where it pays an annual increase in the State Pension includes the USA, so US residents receive the yearly uprating. This differs from some other countries, such as Canada and New Zealand, where gov.uk says the increases are not paid. The pension can be paid into a US bank account, with a 0.39% conversion charge, or into a UK account, every 4 or 13 weeks.

Can I combine US and UK work records to qualify for a pension?+

Yes, through the US-UK Totalization Agreement. For US benefits, SSA can count UK periods if you have at least six US credits but not enough to qualify on your own. For the new UK State Pension, which usually needs 10 qualifying years, time contributing in an agreement country can count towards that minimum. In both cases the benefit amount is still based only on your contributions to that country.

Did the Social Security Fairness Act change anything for people with a UK pension?+

Yes. The Act ended the Windfall Elimination Provision and Government Pension Offset for benefits payable from January 2024. SSA says it increases benefits for, among others, people whose work had been covered by a foreign social security system, which can include people receiving a UK State Pension. SSA began adjusting payments in February 2025 and paid lump sums back to January 2024. Anyone who never claimed a spousal benefit because of the GPO may need to apply now.

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