Do I have to pay US tax on my Social Security if I live in the UK?

Generally no. Article 17(3) of the US-UK tax treaty makes US Social Security paid to a UK resident taxable only in the UK, and the treaty preserves that rule for US citizens. IRS Publication 915 confirms that US citizens resident in the United Kingdom are exempt from US tax on these benefits. You must still report the benefit on your UK Self Assessment return, and you may still need to file a US return if your other income exceeds the filing threshold.

Is my UK State Pension taxable in the United States?

For a US citizen or green card holder who lives in the UK, usually yes. The treaty's social security rule only covers payments from one country to a resident of the other, so a UK State Pension paid to a UK resident is not exempt, and the saving clause lets the US tax its citizens on it. The UK also taxes it, and UK tax on that income can normally be claimed as a US foreign tax credit.

Can a retiree use the Streamlined Foreign Offshore Procedures if they spend winters in Florida?

Only if at least one year in the three-year return period meets both conditions: no US abode and at least 330 full days physically outside the United States. Spending three or four months in Florida each year typically fails the day count in every year. In that case the Streamlined Domestic Offshore Procedures may be available for non-wilful conduct, but they carry a 5% miscellaneous offshore penalty.

Is the 25% tax-free lump sum from a UK pension tax-free in the US?

Not automatically. The treaty contains a rule exempting amounts that are tax-free in the scheme country, but it is drafted around a resident of one country drawing on a scheme in the other. For a US citizen who lives in the UK and draws from a UK scheme, the US treatment of the tax-free element is a contested position. It should be analysed on the facts and documented on the return rather than assumed.

Does HMRC tax US Social Security for a UK resident?

Yes. Because the treaty gives the UK the sole right to tax US Social Security paid to a UK resident, HMRC expects it to be declared as foreign pension income on the Self Assessment return. Retirees who have not included it should correct their UK returns separately from any US catch-up. GOV.UK confirms that UK residents normally pay UK tax on all their income, whether it arises in the UK or abroad.

Is there a penalty under the Streamlined Foreign Offshore Procedures for retirees?

No. The IRS states that filers who complete the Streamlined Foreign Offshore Procedures properly are not subject to failure-to-file, failure-to-pay, accuracy-related, information return or FBAR penalties. You pay any tax shown on the three delinquent or amended returns, plus statutory interest. The 5% miscellaneous offshore penalty applies only under the Streamlined Domestic Offshore Procedures, for taxpayers who do not meet the foreign non-residency test.

Streamlined Foreign Offshore for US Retirees in the UK

The IRS Streamlined Foreign Offshore Procedure (SFOP) is usually the cleanest way for a US citizen or green card holder who has retired in Britain to catch up on missed US tax returns and FBARs: the Streamlined Foreign Offshore route asks for three years of returns, six years of FBARs and a signed non-wilful certification, and it carries no penalty. For most retirees the bigger question is not whether the route exists but how each stream of retirement income lands on the US return once the US-UK tax treaty is applied correctly.

This guide is for wealthy retirees, not first-time expats, so it skips the general SFOP mechanics and focuses on what is different about a retiree's file: US Social Security paid to a UK address, the UK State Pension, UK pension drawdown, a large cash and investment portfolio, UK funds the US treats as PFICs, and the couple who still winter in Florida.

Why do US retirees in Britain fall behind on US filings?

In the returns we prepare, retirees rarely fall out of compliance through carelessness. The triggers that kept them filing disappear: no more Form W-2 from a US employer, no Form 1099 from a US brokerage, no spring reminder from a US preparer.

The three beliefs we hear most often are these:

My pension is paid abroad, so it is not US income. The United States taxes its citizens and green card holders on worldwide income regardless of where they live, and pension income does not qualify for the foreign earned income exclusion. The Form 2555 instructions at https://www.irs.gov/instructions/i2555 list pension and annuity income, including social security benefits, as not foreign earned income.
My Social Security is exempt, so I have nothing to file. For a UK resident, US Social Security is in fact usually exempt from US tax under the treaty, but that does not remove the filing obligation if other income, such as UK pension drawdown, interest and dividends, takes the client over the filing threshold.
HMRC taxes everything already. UK tax paid is creditable on the US return, which often reduces the US balance to little or nothing, but a credit can only be claimed on a return that is actually filed. Information forms such as the FBAR and Form 8938 are required whether or not any US tax is due.

A fourth trigger is US Social Security paid into a UK bank account for years with no US return filed. In our experience the gap usually surfaces when a family member or a UK private bank onboarding team asks about US status.

Is the Streamlined Foreign Offshore route open to a UK retiree?

For most long-settled retirees, yes. The IRS page at https://www.irs.gov/individuals/international-taxpayers/us-taxpayers-residing-outside-the-united-states sets out the non-residency requirement for US citizens and green card holders: in any one or more of the most recent three years for which the return due date has passed, the individual did not have a US abode and was physically outside the United States for at least 330 full days. The failure to file must also have been non-wilful, meaning negligence, inadvertence, mistake or a good-faith misunderstanding of the law, and the IRS must not already have opened an examination of the relevant years.

Retirees usually meet the non-wilful standard where the explanation is the honest one: they believed foreign pensions were not US-taxable, or that the Social Security exemption meant nothing needed filing. The point needing care is the day count for couples who still spend part of the year in the United States, covered below. Green card holders who assume their card simply lapsed may still be US persons for tax purposes unless status was formally abandoned or terminated.

What goes into a retiree's Streamlined Foreign Offshore package?

The core package is the same for every SFOP filer, as set out on the IRS page cited above:

Delinquent or amended Form 1040 returns for the most recent three years for which the US return due date (including a properly applied-for extension) has passed, each marked Streamlined Foreign Offshore in red at the top of the first page.
All required information returns for those years, for example Form 8938, Form 8621 for PFIC holdings, Form 5471 or Form 3520 where relevant.
FBARs (FinCEN Form 114) for the most recent six years, filed electronically through the BSA E-Filing System at https://bsaefiling.fincen.treas.gov rather than on paper.
Form 14653, the Certification by US Person Residing Outside of the United States, with a narrative explaining the non-wilful conduct.
Payment of all tax shown on the returns plus statutory interest.

The returns and the certification are filed on paper to the Austin address the IRS publishes; the IRS states that electronic submissions are not accepted for the tax return package. Properly completed, the procedures carry no failure-to-file, failure-to-pay, accuracy-related, information return or FBAR penalties. The 5% miscellaneous offshore penalty belongs to the Streamlined Domestic Offshore Procedures, not to the Streamlined Foreign Offshore route.

The Form 14653 narrative should explain, in the client's own facts, when they left the United States, why they believed no filing was needed, who prepared their UK returns and how they discovered the gap. Generic wording is the most common weakness we see.

How is US Social Security taxed for a US citizen living in the UK?

US Social Security paid to a UK resident is taxable only in the UK. Article 17(3) of the US-UK double taxation convention provides that payments made by a Contracting State under its social security legislation to a resident of the other Contracting State are taxable only in that other State. The full text is published on GOV.UK at https://www.gov.uk/government/publications/usa-tax-treaties/2001-uk-usa-double-taxation-convention-as-amended-by-the-2002-protocol-in-force.

Why does this survive the saving clause, under which the United States reserves the right to tax its citizens as if the treaty did not exist? Because Article 1(5)(a) of the convention expressly preserves paragraph 3 of Article 17 from the saving clause. IRS Publication 915 at https://www.irs.gov/publications/p915 confirms the outcome in plain terms: US citizens who are residents of the United Kingdom are exempt from US tax on their benefits.

Two consequences follow. The Form SSA-1099 benefit is handled as treaty-exempt on the US return, and we consider in every case whether a treaty-based disclosure on Form 8833 is needed. And the benefit moves onto the UK return. HMRC taxes it as foreign pension income, so the UK Self Assessment return must include it, and a retiree who has been filing UK returns without it may have a UK correction to make alongside the US catch-up.

Is the UK State Pension taxable on a US return?

Generally, yes, for a US citizen or green card holder who lives in the UK. Article 17(3) only allocates taxing rights where the benefit is paid by one country to a resident of the other. A UK State Pension paid to a UK resident is a domestic payment from the UK's perspective, so the treaty does not exempt it, and the saving clause leaves the United States free to tax its citizens on it.

GOV.UK confirms at https://www.gov.uk/tax-on-pension that the basic and new State Pension, and any Additional State Pension, count as taxable income in the UK. The same income therefore appears on both returns, and UK tax attributable to it is a candidate for the US foreign tax credit on Form 1116, described at https://www.irs.gov/forms-pubs/about-form-1116. Publication 915 lists only Canada and Germany as countries whose social security benefits are treated as if paid under US social security legislation for US residents, so the characterisation of the UK State Pension on a US return is a position we document rather than assume. On the information-return side, the IRS comparison table indicates that foreign social security is not reportable on either the FBAR or Form 8938.

How do UK pension drawdown and lump sums land on the US return?

UK workplace and personal pensions are where most of the technical work sits for a retiree. Under Article 17(1)(a), pensions beneficially owned by a resident of a Contracting State are taxable only in that State, but the saving clause allows the United States to tax its own citizens anyway. The practical result for a US citizen resident in the UK is that drawdown income and annuity payments from UK schemes are taxable in both countries, with the UK taxing first as the residence country and the US granting a foreign tax credit for the UK tax.

Three treaty points matter for a wealthy retiree with a large UK pension pot:

Growth inside the scheme. Article 18(1) provides that income earned by a pension scheme established in the other Contracting State is taxed as income of the member only when it is paid out. Article 18(1) is one of the provisions Article 1(5)(a) preserves from the saving clause, which supports deferral of US tax on growth inside a qualifying UK scheme until benefits are paid.
The UK tax-free lump sum. GOV.UK explains that part of a private pension can be taken tax-free, subject to the lump sum allowance. Article 17(1)(b) exempts amounts that would be exempt in the scheme country, but its wording is drafted around a resident of one country receiving a pension from a scheme in the other. For a US citizen who is resident in the UK and draws on a UK scheme, the US treatment of the tax-free element is a contested position. We set it out explicitly in the file and take a view on the client's specific facts rather than assume the UK exemption carries across.
Lump sums from a US scheme. Article 17(2) allocates lump sums from a scheme in one country, received by a resident of the other, to the scheme country only. US workplace plans and retirement accounts are outside the scope of this article, so we note only that the rule exists.

The foreign tax credit usually absorbs the US tax on drawdown income, because UK rates on a substantial pension are often at or above US rates. Where the UK tax-free element is treated as taxable in the US there is no UK tax to credit, so that single position can drive the US balance on an otherwise neutral return.

UK bank interest, dividends and UK funds: what changes for a retiree?

Retirees with large portfolios tend to hold three types of UK investment income, and each needs its own treatment on the US return.

UK bank and building society interest is ordinary interest income for US purposes and foreign-source passive income for the foreign tax credit. Interest earned inside an ISA is tax-free in the UK but fully taxable in the United States, because the US does not recognise the ISA wrapper; with no UK tax to credit, ISA income often produces a small US liability even when everything else nets to zero.

Dividends from directly held UK shares are foreign dividends; whether they qualify for preferential US rates depends on the issuer and holding period, checked share by share.

UK collective funds, such as OEICs, unit-linked funds and many listed investment companies, are commonly passive foreign investment companies for US purposes. PFIC status brings Form 8621, described at https://www.irs.gov/forms-pubs/about-form-8621, and a punitive default regime unless an election applies. For a retiree with a fund-heavy portfolio, the PFIC computations are frequently the most time-consuming part of a Streamlined Foreign Offshore file, which is why we ask for full broker statements.

How big is the FBAR and Form 8938 asset base for a wealthy retiree?

Much larger than most retirees expect. The FBAR is required where the aggregate value of foreign financial accounts exceeds $10,000 at any time in the calendar year, according to FinCEN guidance at https://www.fincen.gov/report-foreign-bank-and-financial-accounts and the IRS comparison table at https://www.irs.gov/businesses/comparison-of-form-8938-and-fbar-requirements. Every UK current account, savings account, cash ISA, stocks and shares ISA, general investment account and joint account with a spouse counts towards that aggregate, and each one with signature authority or a financial interest must be listed.

Form 8938 has higher thresholds for taxpayers living abroad. The IRS comparison table states that a single filer or married filing separately must file where specified foreign financial assets exceed $200,000 on the last day of the year or $300,000 at any time, and married filing jointly where they exceed $400,000 on the last day of the year or $600,000 at any time.

UK pension arrangements raise their own reporting questions on both forms. The IRS table does not list foreign pensions explicitly, and in practice we review each scheme, including SIPPs and workplace defined contribution arrangements, against the current FBAR and Form 8938 instructions before deciding how it is reported. Foreign social security, including the UK State Pension entitlement, is not reportable on either form.

What does HMRC expect from a UK-resident retiree?

HMRC's starting point is that residents normally pay UK tax on all their income, whether it arises in the UK or abroad, as GOV.UK explains at https://www.gov.uk/tax-foreign-income/residence. For a US retiree living in Britain, that means UK Self Assessment should capture the UK State Pension, UK pension drawdown, UK interest and dividends, and US-source items including US Social Security.

UK registration and filing dates are fixed. GOV.UK at https://www.gov.uk/self-assessment-tax-returns/deadlines states that a person who needs to complete a return for the previous year must tell HMRC by 5 October, that paper returns for the 2025 to 2026 year are due by 31 October 2026, and that online returns and payment are due by 31 January 2027. Where a US-source item has been omitted from earlier UK returns, the UK correction should be handled on its own timetable, separate from the US Streamlined Foreign Offshore filing.

GOV.UK at https://www.gov.uk/tax-foreign-income/taxed-twice explains that UK residents can usually claim Foreign Tax Credit Relief through Self Assessment, but may not get back the full foreign tax paid. For most retirees UK tax is the primary layer on pensions and UK investment income, so most of the credit work happens on the US return.

Do winters in Florida break the Streamlined Foreign Offshore non-residency test?

They can. The non-residency test needs only one qualifying year out of the three-year return period, but in that year the retiree must have both no US abode and at least 330 full days outside the United States. A couple who spend December to March in Naples, Florida, every year will be outside the US for well under 330 full days in each year and will not meet the day count in any year of the window, however British their everyday life has become. The IRS notes that temporary presence in the United States, or maintaining a US dwelling, does not necessarily place someone's abode there, but the day count is mechanical and cannot be argued away.

Where a retiree fails the foreign test, the Streamlined Domestic Offshore Procedures remain available for non-wilful conduct, but they carry the 5% miscellaneous offshore penalty and a different package. We map travel records for every year in the window before choosing the route. On the UK side, long US winters can also affect the UK Statutory Residence Test, which HMRC sets out in its RDR3 guidance; most of our retiree clients remain clearly UK resident, but the analysis should be done rather than assumed.

Worked scenario: a retired couple in the Cotswolds

The following is an illustration with assumed figures, not a real client, and uses an assumed exchange rate of 1 pound to 1.30 US dollars for every year.

Robert and Ellen are both US citizens in their early seventies. They moved to a village near Cirencester in 2015 after Robert's banking career ended, and they have not filed US returns since their 2017 year, believing that pensions paid in Britain and treaty-exempt Social Security left nothing to report. They file UK returns each year and spend only three weeks each summer in the United States.

Their illustrative annual income is US Social Security of $52,000 combined, UK workplace pension drawdown for Robert of 40,000 pounds (about $52,000), a UK State Pension for Ellen of 9,000 pounds (about $11,700), UK bank interest of 14,000 pounds (about $18,200), dividends from directly held UK shares of 22,000 pounds (about $28,600) and distributions from UK OEICs held in a general investment account. Their UK cash accounts and ISAs peak at around 1.1 million pounds (about $1.43 million) each year, and their OEIC holdings are worth around 600,000 pounds (about $780,000).

How their Streamlined Foreign Offshore file comes together:

Eligibility. Each year they are outside the US for well over 330 full days and have no US home, so the non-residency test is met in every year of the window.
Social Security. Excluded from US taxable income under Article 17(3), and added to their UK returns as foreign pension income where it had been missed.
Pension drawdown and State Pension. Included on the US returns, with UK income tax on that income claimed as a foreign tax credit on Form 1116.
Interest and dividends. Included on the US returns; ISA interest and ISA dividends carry no UK tax, so they generate a modest US liability.
UK funds. Each OEIC treated as a PFIC with a Form 8621 per fund per year; in this illustration it is the PFIC computation, not the pension, that produces most of the US tax and interest.
Filing status. Married filing jointly, so Form 8938 is required at their asset levels, listing every UK account and fund.
FBARs. Six years of FBARs for each of them, listing joint accounts on both, filed through BSA E-Filing.

In files like this the US balance is usually modest relative to the information-return exposure, but rarely zero. The real value of the Streamlined Foreign Offshore route for Robert and Ellen is that it closes the FBAR and Form 8938 exposure with no penalty, which on a seven-figure UK portfolio is the risk that matters.

Retiree Streamlined Foreign Offshore checklist

Confirm US status for each spouse, including whether a green card was ever formally abandoned.
Build a travel calendar for every year in the three-year window and test the 330-day and abode conditions.
Collect Form SSA-1099 for each year, UK State Pension annual statements and UK pension provider payment summaries showing taxable and tax-free elements.
Obtain year-end and maximum-balance figures for every UK bank, savings, ISA and investment account for six years.
Request full transaction histories for UK funds to support PFIC computations on Form 8621.
Gather UK Self Assessment returns and HMRC calculations to support the Form 1116 credit.
Decide filing status, particularly where one spouse is a UK national without US status.
Draft a specific, factual Form 14653 narrative signed by each filer.
Check whether US Social Security and other US-source items were included on the UK returns, and correct the UK side separately if not.

Failure modes we see in retiree files

The failure mode we see most often is treating US Social Security as taxable on the US return out of caution. That overstates US income for every year of the catch-up, can inflate the tax and interest paid, and often coincides with the benefit being left off the UK return entirely, which is the reverse of what the treaty requires.

Bringing your US filings back into line

For US retirees in Britain, the Streamlined Foreign Offshore route is often the most efficient way to resolve missed filings without penalty, provided the treaty analysis on Social Security and UK pensions, the PFIC computations and the Form 14653 narrative are done properly. If you are a US citizen or green card holder who has retired to the UK and is behind on US returns or FBARs, our team prepares complete Streamlined Foreign Offshore packages, alongside the UK Self Assessment corrections where they are needed.