Surviving Spouse Tax US UK: Filing Status, Pensions and Estates for American Widows and Widowers

Surviving spouse tax in the US and UK comes down to three questions: how you file your own US return in the year of death and the two years after it, which of your late spouse's pensions and benefits pass to you, and whether either country taxes what you inherit. For most widows and widowers the answers are favourable, but a cross-border marriage brings two traps that domestic couples never meet: the US rule for a spouse who is not a US citizen, and the UK cap for a spouse who is not a long-term UK resident.

This guide is for an American widow or widower living in the UK, and for the British surviving spouse of an American. It follows the order in which things actually happen after a death: the deceased's final returns, the survivor's own filing status, pensions and Social Security, and then the estate in each country. For the wider planning picture while both partners are alive, see our guide to tax planning for US/UK mixed couples.

What has to be filed after a spouse dies?

After a spouse dies, there is a final US return for the year of death and a UK Self Assessment position to close, alongside any estate returns. Who files what depends on the citizenship and residence of the person who died.

United States. If your spouse was a US citizen or US resident, their income up to the date of death goes on a final Form 1040 for that year. In most marriages that is a joint return with you (see the next section). If your spouse was British and never a US person, there is usually no US return for them at all, unless they had US-source income.

United Kingdom. GOV.UK explains that the personal representative (the executor or administrator) may need to file a Self Assessment return for income the person earned before they died, and a separate return for income the estate receives during administration. Each spouse is taxed separately in the UK, so there is no UK equivalent of a joint return; your own UK return carries on as before.

Tell both governments about the death. In the UK, the Tell Us Once service notifies HMRC and the Department for Work and Pensions together. In the US, tell the Social Security Administration and any US pension or IRA custodian.

US filing status for a surviving spouse

For a US citizen widow or widower, filing status is where the US system is most generous, and it runs on a fixed timetable.

The year of death: married filing jointly

IRS Publication 501 says that if your spouse died during the year, you are considered married for the whole year and can choose married filing jointly, provided you did not remarry before the end of the year. The executor or administrator signs the return for the spouse who died; if no one has been appointed, you can sign for your spouse. The year of death is the last year you can file jointly with that spouse.

A joint return normally gives the lowest US tax, and for an American in the UK it also lets the couple combine foreign tax credits and exclusions on one return. Where the spouse who died was a British nonresident alien, the general rule is that a couple cannot file jointly if either spouse was a nonresident alien at any time in the year. If the couple had already chosen to treat the nonresident spouse as a US resident, that choice stays in effect until it is ended, so check what was filed in earlier years before deciding.

The next two years: qualifying surviving spouse

Qualifying surviving spouse (formerly qualifying widow(er)) gives joint-return tax rates and the highest standard deduction for the two years after the year of death, though it does not allow a joint return. Publication 501 sets five conditions:

1. You were entitled to file a joint return with your spouse for the year of death, whether or not you actually did.
2. You did not remarry before the end of the tax year.
3. You have a child or stepchild (not a foster child) whom you can claim as a dependant, with limited exceptions.
4. The child lived in your home all year, apart from temporary absences.
5. You paid more than half the cost of keeping up the home for the year.

The IRS example: if your spouse died in 2023 and you have not remarried, you could file jointly for 2023 and as a qualifying surviving spouse for 2024 and 2025. After that you may qualify as head of household. A widow or widower with no dependent child files as single from the year after death (or as head of household if another qualifying person lives with them), which often raises their US tax, although for an American in the UK, foreign tax credits on UK tax frequently leave little US tax to pay either way.

Tax year	US filing status available	Condition
Year of death	Married filing jointly	Not remarried by 31 December
First year after death	Qualifying surviving spouse	Dependent child living with you; not remarried
Second year after death	Qualifying surviving spouse	Same conditions
Later years	Head of household or single	Head of household needs a qualifying person

Which pensions and benefits does a surviving spouse inherit?

A surviving spouse can usually inherit some of the late spouse's state pension rights in both countries, and becomes the beneficiary of most private pensions and retirement accounts. Each has its own tax treatment.

UK State Pension

Under the new State Pension, GOV.UK says you inherit half of your partner's protected payment if your marriage or civil partnership began before 6 April 2016 and your partner reached State Pension age, or died, on or after that date. Where your partner reached State Pension age before 6 April 2016, you may inherit part of their Additional State Pension or extra State Pension from deferral. GOV.UK also warns that you will not be able to inherit anything if you remarry or form a new civil partnership before you reach State Pension age. Inherited State Pension is paid with your own and is taxed as your income.

A widow or widower under State Pension age may be able to claim Bereavement Support Payment: £3,500 plus 18 monthly payments of £350 at the higher rate (for someone getting Child Benefit or pregnant), or £2,500 plus 18 monthly payments of £100 at the lower rate. The full amount needs a claim within 3 months of the death, and the partner must have paid enough National Insurance contributions in at least one tax year since 6 April 1975.

US Social Security survivors benefits

The Social Security Administration says a widow or widower can receive survivors benefits from age 60, or from 50 if disabled, and at any age if caring for the deceased's child under 16. Remarrying after 60 (50 if disabled) does not end eligibility. A surviving spouse who was living with the worker can also receive a one-time lump-sum death payment of $255.

For tax, Article 17(3) of the US/UK Double Taxation Convention makes social security payments by one country to a resident of the other taxable only in the country of residence, and Article 1(5)(a) applies that to US citizens too. A UK-resident widow therefore pays UK tax, not US tax, on US survivors benefits. Our guide to UK tax on US Social Security shows how to report it.

IRAs and 401(k)s

A spouse is treated more favourably than any other beneficiary of a US retirement account. The IRS page on retirement account beneficiaries lists a spouse as an eligible designated beneficiary and says a spouse can either keep the account as an inherited account or roll it over into their own IRA. That avoids the ten-year deadline that applies to an adult child. Withdrawals are taxable income for US purposes. For a UK resident the UK also taxes them, under the treaty's pension rules, with credit for any US tax; our guide to IRA withdrawals for UK residents covers the detail.

UK workplace and personal pensions

GOV.UK's guidance on tax on a private pension you inherit turns on the age of the person who died. If they died before 75, most lump sums and money from a drawdown fund set up from 6 April 2015 are tax-free for the beneficiary, unless the lump sum is above the deceased's lump sum and death benefit allowance or is paid more than 2 years after the provider was told of the death. If they died at 75 or older, lump sums and drawdown are taxed as the beneficiary's income, and a scheme pension is taxed at any age.

A UK tax-free payment is not automatically free of US tax for a US citizen survivor. The treaty's pension article has rules for lump sums and for exempt amounts, and how they apply to a death benefit paid to a spouse depends on the type of payment. Settle that before choosing between a lump sum and drawdown.

How is the estate taxed when one spouse is American?

Both the US and the UK normally exempt what passes to a surviving spouse. In a cross-border marriage, each country has one exception that turns on the survivor's status, and those exceptions are where surviving spouse tax planning in the US and UK really matters.

US estate tax and the non-citizen spouse

The IRS lists the estate tax filing threshold as $15,000,000 for a death in 2026 ($13,990,000 for 2025), and property passing to a surviving spouse is a deduction from the estate. But the Form 706 instructions say the marital deduction is generally not allowed if the surviving spouse is not a US citizen. It is allowed for property passing to a qualified domestic trust (QDOT), including property transferred to one before the estate tax return is filed. A QDOT must have at least one trustee who is a US citizen or a US corporation, and US estate tax is charged on capital later paid out of the trust.

For most couples below the filing threshold this never bites. It matters for larger estates, and for a British spouse it is a reason to look at the position before a death, not after. Lifetime gifts to a non-citizen spouse are limited too: the IRS says outright gifts to a spouse who is not a US citizen are tax-free up to $194,000 for 2026.

Portability is the other US election to consider. The estate of a spouse who dies can pass any unused exemption to the survivor, but only by filing a timely Form 706, even when no tax is due. The Form 706 instructions add that a nonresident surviving spouse who is not a US citizen generally cannot take the unused amount into account, except as a treaty allows. A US citizen survivor should usually ask the executor to make the election.

UK Inheritance Tax and the spouse exemption

GOV.UK says there is normally no Inheritance Tax to pay on what you leave to a spouse or civil partner, and that any unused threshold can be added to the partner's threshold. Since 6 April 2025 the UK decides the scope of Inheritance Tax by long-term UK residence instead of domicile. HMRC's form IHT402 states that the spouse exemption is unlimited unless the person who died was a long-term UK resident and the surviving spouse was not; in that case it is limited to the nil-rate band, currently £325,000.

The survivor can remove the cap by electing to be treated as long-term UK resident. HMRC's manual at IHTM47031 says the election cannot be revoked and lapses only after 10 consecutive years of non-UK residence. That brings the survivor's own worldwide estate into UK Inheritance Tax, so it suits a survivor who plans to stay in the UK and is a poor trade for one about to move back to the US. The US/UK estate tax treaty can also change the answer and should be checked alongside it.

On the second death, the survivor's estate can claim the first spouse's unused nil-rate band. GOV.UK's guidance on transferring unused basic threshold says this can take the threshold to as much as £650,000, claimed on form IHT402 within 2 years of the surviving spouse's death. The unused residence nil rate band can be transferred separately on form IHT436. Keep the first spouse's estate papers; the second claim depends on them. Our guide to UK Inheritance Tax for Americans explains the long-term resident test.

Pensions and Inheritance Tax from 6 April 2027

From 6 April 2027 most unused pension funds and death benefits come within a person's estate for Inheritance Tax. The government has kept the exemption for death benefits passing to a surviving spouse or civil partner, so a pension left to a spouse remains outside the charge, but pensions left to children after the survivor's own death will not be.

Illustrative example: an American widow in Manchester, a US citizen with one dependent daughter, loses her British husband in March. She files a joint US return for that year only if a resident election was already in place; otherwise she cannot file jointly, and her daughter may let her file as head of household. Her husband was a long-term UK resident and she is not, so the UK spouse exemption on his estate is capped at £325,000 unless she elects to be treated as long-term UK resident. His workplace pension pot, paid to her as a lump sum within two years, is tax-free in the UK because he died before 75, but she still has to report it on her US return and work out how the treaty applies.

What surviving spouses most often get wrong

• Missing the joint return. The year of death is the last chance to file jointly. Executors sometimes file a separate final return without asking whether a joint one would cost less.
• Assuming qualifying surviving spouse applies to everyone. It needs a dependent child living with you. Without one, the survivor files as single from the following year.
• Leaving the State Pension unclaimed. Inherited protected payment or Additional State Pension is not always added automatically; contact the Pension Service and check.
• Skipping the portability election. An estate below the US threshold has no tax to pay, but the unused exemption is lost without a Form 706.
• Overlooking the £325,000 cap. A survivor who is not long-term UK resident can face Inheritance Tax on a spouse's estate that would otherwise be fully exempt.
• Treating UK tax-free pension money as US tax-free. A US citizen reports the payment to the IRS and applies the treaty; the UK exemption does not carry across automatically.

A surviving spouse tax checklist for the US and UK

1. Register the death and use Tell Us Once in the UK; tell the SSA and any US pension or IRA custodian.
2. Collect your spouse's last returns in both countries, their pension statements and a list of assets with date-of-death values.
3. Decide the US filing status for the year of death, and whether qualifying surviving spouse applies for the next two years.
4. Claim inherited UK State Pension, Bereavement Support Payment if under State Pension age, and US survivors benefits.
5. Choose how to take each pension and IRA, with the tax in both countries worked out first.
6. With the executor, consider the Form 706 portability election, a QDOT if you are not a US citizen, and the UK spouse exemption cap and election.
7. Keep the first estate's papers for the transferable nil-rate band claim on your own death.

How we help

US/UK Cross Border Tax is a team of US CPAs and UK tax advisers working as one team, in London, Manchester, New York and San Francisco. We prepare the final joint return, advise on filing status, pensions and survivor benefits, and work with executors on the estate in both countries. Read about our surviving spouse tax US UK support for retirees and widowed clients, our estate and trust planning and our US/UK pensions service, or contact us for a fee quote.