Marrying a Partner Who Is Not Long-Term UK Resident

Not always. The inheritance tax spouse exemption — the rule that lets you leave everything to a husband or wife with no tax to pay — is unlimited only where the person inheriting is long-term UK resident. Where your spouse is not, the exemption is capped, and anything you leave them above that cap is treated like any other part of a taxable estate. The assumption that marriage makes the whole estate pass tax-free between you can be wrong, and it is wrong in exactly the situation people least expect: a genuine, loving, legally married couple.

This catches couples where one partner has recently moved to the UK, or spends significant time abroad, or has only lived here for a few years. The exemption was not designed to police the marriage; it was designed to stop assets leaving the UK tax net by being handed to a spouse who is not within that net. But the effect on an ordinary couple is the same either way — a bill can fall on the first death that a couple assumed could never arise.

Since 6 April 2025 the test for who counts as being inside the net changed. It used to turn on domicile, a slippery concept about where a person truly belongs. It now turns on long-term UK residence, which is measured in tax years and is far easier to check. Knowing which side of that line your spouse falls is the whole question.

The short answer: the exemption is unlimited only if the survivor is long-term UK resident

Start from the general rule, because it is genuinely generous and applies to most couples. When one spouse or civil partner dies and leaves everything to the other, there is normally no inheritance tax on that transfer, however large the estate. Assets simply pass across, and any tax question is deferred until the survivor dies. That is the spouse exemption, and for a couple both settled in the UK it does what everyone expects.

The exception is narrow but sharp. The full, unlimited exemption depends on the spouse who inherits being long-term UK resident. Where they are not, the exemption still exists but is limited to a capped amount. Leave them more than the cap and the surplus is added to the taxable estate, set against the available nil-rate band, and taxed if it exceeds it. The marriage does not fix this; the residence status of the receiving spouse is what matters.

What the spouse exemption normally does

It is worth being clear about how much the ordinary exemption removes from the equation, so you can see what is at stake when it is capped. For a settled couple, the first death is usually a non-event for tax: the estate passes to the survivor exempt, and the couple's allowances are preserved for later. Unused nil-rate band can transfer to the survivor, and the residence nil-rate band works similarly, so the tax is dealt with once, on the second death, rather than twice.

Contrast that with couples who never had the exemption at all. An unmarried couple get no spouse exemption whatsoever, because it is a benefit of marriage or civil partnership, and their position is set out in unmarried partners and inheritance tax, where there is no exemption. A married couple where one spouse is not long-term resident sit in between: they have the exemption, but a limited version of it.

When the exemption is capped

Where the surviving spouse is not long-term UK resident, the exemption on transfers to them is limited to an amount equal to the nil-rate band. In practical terms, that means a fixed slice can pass to them exempt, and the survivor also has their own nil-rate band to set against anything above it, but beyond those allowances the transfer is chargeable at the standard rate.

Source: HM Revenue & Customs, Inheritance Tax (gov.uk). The nil-rate band is £325,000 and the standard inheritance tax rate on the amount above available allowances is 40 per cent; both are set out in HMRC's published rates and thresholds.

One point that trips couples up is that the capped exemption is not renewed transfer by transfer. It works as a single running total: gifts you make to that spouse during your lifetime use it up, and whatever is left is what applies on death. You cannot reset it by handing assets across in stages over the years, because each transfer draws on the same limited pot. That matters for couples who assume they can quietly move things into the non-resident spouse's name ahead of time and sidestep the issue; the allowance those transfers use is the very allowance that would otherwise have sheltered the estate on death.

The consequence is that a couple with a valuable home and one non-resident spouse can face a real bill on the first death, at the very moment they assumed the exemption would carry the whole estate across untouched. If the wealth is concentrated in the house, that is doubly awkward, because the asset that generates the tax is the one nobody wants to sell in the year of a bereavement. This is the same cash-flow problem that arises whenever tax lands before the estate can be freed up, and it is worth reading alongside how gifts made in life can produce an unexpected charge, in a gift within seven years and who pays the tax.

What "long-term UK resident" replaced domicile means

The reform that took effect on 6 April 2025 matters because it changed the test from something vague to something countable. Inheritance tax used to hang on domicile — essentially the country a person regarded as their permanent home — which could be argued about for years. It now hangs on long-term UK residence, defined by how many tax years someone has actually been resident here.

Broadly, a person becomes long-term UK resident once they have been UK resident for at least ten of the previous twenty tax years, and they remain long-term resident for a period after they leave. The detail matters and there are transitional rules, so this is a place to read the guidance rather than rely on a rule of thumb. HMRC publishes the definition and worked examples, and the starting point is the government's inheritance tax guidance on gov.uk. The reason it is worth checking precisely is that a spouse who has been here nine years and a spouse who has been here eleven can be on opposite sides of the exemption.

Because this is a UK-wide tax, the residence test and the exemption cap apply identically in England, Wales, Scotland and Northern Ireland — inheritance tax does not vary by nation. What does differ north of the border is the machinery of administering the estate: Scotland uses confirmation rather than a grant of probate, but the tax itself, and the deadline for paying it, are the same throughout the UK.

The election, and the trade-off it carries

There is a way for a non-long-term-resident spouse to obtain the unlimited exemption: they can elect to be treated as if they were long-term UK resident for inheritance tax purposes. Making the election removes the cap, so a transfer between the spouses becomes fully exempt just as it would be for a settled couple.

It is not a free option, and it should not be made without advice. The price of being treated as long-term resident for the exemption is being treated as long-term resident more generally, which brings the electing spouse's worldwide assets within the scope of UK inheritance tax, both going forward and for a period even if they later leave the UK. For a couple whose wealth is mostly in the UK anyway, that may cost little and solve the problem cleanly. For a couple with substantial assets abroad, it can pull far more into the UK net than it saves. This is a genuine trade-off, decided on the individual figures, which is why it is one for a solicitor or tax adviser rather than a rule of thumb.

If a bill lands on the first death: who pays, and when

Where a charge does arise on the first death, it falls on the estate, and the timing is unforgiving. Inheritance tax is generally due by the end of the sixth month after the month in which the person died, and on the taxable portion the tax has to be dealt with before probate is granted — which is to say, before the executors can get at much of the estate to pay it. That is the trap: the money is locked inside the estate, and the tax on it is due before the lock opens.

This is precisely the gap that life cover held in trust is used to fill. A policy written in trust does not form part of your estate and is not itself subject to inheritance tax; it pays the trustees, who can hand the funds to your spouse or executors quickly, in time to meet the deadline without selling the house or cashing in investments at a bad moment. The sum you would want is broadly the tax that could fall due on the first death, which a solicitor can estimate once the residence position is clear. Whether cover is offered, and on what terms, depends on age and health and is settled through underwriting, so it is better arranged while both of you are well.

Covering the gap

The order of things is worth keeping simple. First, establish whether the spouse who would inherit is long-term UK resident, because if they are, the unlimited exemption applies and there is no first-death bill to plan for. If they are not, work out the likely charge, consider whether the election makes sense on your particular assets, and decide whether to hold cover in trust to meet any tax that would still fall due. Updating the name on any existing policy after a marriage matters here too, so a claim is not held up by mismatched paperwork, which we cover in your new surname and the name on the policy.

If you want to see what cover to meet a potential bill would involve, you can get life insurance quotes and have an FCA-authorised broker set the amount against the figures your adviser works out. The wider set of questions that a marriage raises — wills, homes and who ends up providing for whom — runs through our hub on life events that change who depends on you, including what happens where a survivor can rewrite a mirror will after you die.

Frequently asked questions

Is the inheritance tax spouse exemption always unlimited?

No. Transfers to a spouse or civil partner are exempt without limit where the person receiving them is long-term UK resident. Where they are not, the exemption is capped at an amount equal to the nil-rate band, and anything above the cap is treated as chargeable in the usual way alongside the survivor's own nil-rate band. The couple being genuinely married does not remove the cap.

What is the long-term residence test?

Since 6 April 2025 inheritance tax follows long-term UK residence rather than domicile. Broadly, someone becomes long-term UK resident once they have been UK resident for at least ten of the previous twenty tax years, and they remain so for a period after leaving the UK. There are transitional and detailed rules, so HMRC's published guidance is the place to confirm an individual case rather than a rule of thumb.

What if a bill does arise on the first death?

It falls on the estate, and inheritance tax is generally due by the end of the sixth month after the month of death, before probate is granted on the taxable part. That deadline often arrives before the estate can be unlocked to pay it. Cover written in trust pays outside the estate, which is how families avoid selling the home or cashing in investments to meet the bill in time.