Cohabiting Partner Inheritance UK — Your Legal Rights, In Full

Written by: SL · Last updated: May 2026

The legal definition of a cohabiting partner

The UK does not have a single statutory definition of "cohabiting partner". Different statutes use different tests. The most important, for inheritance purposes, is the test in section 1(1A) of the Inheritance (Provision for Family and Dependants) Act 1975: a person who, during the two years immediately before the deceased's death, "was living in the same household as the deceased, and as the husband or wife or civil partner of the deceased".

That test exists only for the purpose of giving the cohabiting partner the right to bring a court claim against the estate. It is not a test that creates automatic inheritance rights. Cohabitation under any UK statute does not produce the equivalent of marriage. The Office for National Statistics estimates that around 3.6 million UK couples cohabit without being married, and survey work consistently finds that close to half of them believe — wrongly — that they have the same legal rights as married couples. They do not. (See our companion piece on the common law marriage myth for why the misconception is so widespread.)

What a cohabiting partner does not inherit by default

If a UK partner dies without a will, the intestacy rules in the Administration of Estates Act 1925 apply. The estate passes through a strict hierarchy of blood relatives. A cohabiting partner appears nowhere in the hierarchy. In priority order:

1. Spouse or civil partner
2. Children (then grandchildren, then great-grandchildren — "per stirpes")
3. Parents
4. Brothers and sisters of the whole blood (or their descendants)
5. Brothers and sisters of the half blood (or their descendants)
6. Grandparents
7. Aunts and uncles of the whole blood (or their descendants)
8. Aunts and uncles of the half blood (or their descendants)
9. The Crown — known as bona vacantia

The point worth dwelling on: in the absence of any traceable relative, the Crown takes the estate before a cohabiting partner does. There is no length-of-cohabitation override. There is no "shared mortgage" override. There is no "we had children together" override. The intestacy rules are arithmetic, and the cohabiting partner is not in the calculation.

The three routes by which a cohabiting partner can inherit

Route 1 — A valid will

This is the route worth optimising for. A will is the single document that names a cohabiting partner as a beneficiary of the estate, with no court process and no contest. The Wills Act 1837 (still the primary statute governing wills in England and Wales) requires only that the will is in writing, signed by the testator, and witnessed by two adult witnesses who are not beneficiaries. The whole document is rarely more than four pages.

For most cohabiting couples, the right structure is a pair of mirror wills — two separate wills with matching terms, each partner leaving the residuary estate to the other, with substitute beneficiaries (typically children, or named relatives) in case the partner predeceases or both partners die in the same event.

Route 2 — Jointly-held assets and nominations

Several common assets fall outside the estate altogether, provided the paperwork is right:

• Property held as joint tenants. The deceased's interest passes automatically to the surviving co-owner under the doctrine of survivorship. The will is irrelevant; the intestacy rules are irrelevant. The asset is transferred by lodging a copy of the death certificate with HM Land Registry. You can confirm whether you hold the property as joint tenants by ordering an Official Copy of Register from HM Land Registry for £3.
• Jointly-held bank and building society accounts. Also pass automatically by survivorship. The bank usually requires only a death certificate to update the account holder.
• Pensions with a current nomination of beneficiaries form. Most UK workplace and personal pensions are held in trust and pass according to the nomination form, not the will. If your partner nominated you on that form, the death benefit comes to you directly, free of inheritance tax in most cases.
• Life insurance written in trust. The payout goes to the named beneficiary directly, outside the estate.

Two practical actions for cohabiting couples this week, regardless of whether you have a will:

1. Order an Official Copy of Register to confirm whether the home is held as joint tenants or tenants in common.
2. Contact every pension provider you use and check your nomination form names your partner.

Route 3 — An Inheritance Act 1975 claim

If your partner dies without a will (or with a will that leaves you out), and you cohabited as if a spouse for the two years immediately before death, you can apply to court under the Inheritance Act 1975 for "reasonable financial provision". This route should be understood for what it is: a backstop, not a substitute for a will. The realities of a 1975 Act claim are:

• Filed in the County Court or the Chancery Division of the High Court
• Must be filed within six months of probate or Letters of Administration being granted
• Legal fees typically £15,000 to £50,000 (and sometimes higher in contested estates)
• Takes 12 to 24 months to conclude
• Awards "reasonable maintenance" only — the court cannot give you the whole estate, only what it judges sufficient to meet your needs
• Can be opposed by the deceased's blood relatives, who are the default beneficiaries under intestacy

For a step-by-step walk-through of what to do if you are in this situation now, see our companion guide: what to do if your partner dies without a will.

Inheritance Tax for cohabiting partners

This is the area where the law treats cohabiting couples most harshly. Each partner has their own basic allowances:

• Nil-rate band: £325,000 per person (frozen by HMRC until April 2030).
• Residence nil-rate band: £175,000, but only available if the main home is left to a "direct descendant" — a child, grandchild, or great-grandchild. A cohabiting partner is not a direct descendant.

What cohabiting partners cannot do:

Above the threshold, IHT is charged at 40% (or 36% if at least 10% of the estate is left to charity). For cohabiting partners with estates approaching the threshold, the typical mitigations are: life insurance written in trust to cover the projected IHT, planned lifetime gifting (the seven-year rule), trusts for children so the residence nil-rate band can be used, and pension structures that keep death benefits outside the estate. None of these are off-the-shelf. For estates close to or above £325,000, an estate-planning conversation is usually worth the cost.

The property trap most cohabiting couples don't know about

When two cohabiting partners buy a home together, they hold it as either joint tenants or tenants in common. Most couples assume joint tenants — and many are wrong. If the conveyancing solicitor titled the property as tenants in common (sometimes the default when partners contributed unequal deposits, or when one partner has children from an earlier relationship), each partner owns a defined share. On death, that share passes under the will — or, with no will, under intestacy to blood relatives.

The practical result: a surviving cohabiting partner can find themselves co-owning their family home with the late partner's parents, siblings, or — worst case — estranged adult children from a previous relationship. The survivor may have to buy them out, take out a new mortgage, or sell the property to settle the inherited shares.

If you discover you are tenants in common when you assumed joint tenants, the fix is either: (a) a "deed of severance" / change of register at HM Land Registry to convert to joint tenants; or (b) a will leaving the share to your partner explicitly. For most cohabiting couples, the will is the simpler step.

Pensions, life insurance, and ISAs — the quick audit

Pensions

Most UK workplace pensions, SIPPs, and personal pensions are written under discretionary trusts and sit outside the estate for IHT purposes. They pass according to the nomination of beneficiaries form (sometimes called an "expression of wish"). If you nominated your partner, they receive the death benefit — typically tax-free if the deceased was under 75, taxable as income if over 75. If the form has never been filled in, or names a previous partner, the scheme trustees decide — and they usually default to spouse or blood relatives.

Life insurance

If the policy is "written in trust" for the cohabiting partner, the payout goes directly to them, bypasses the estate, and is not subject to IHT. If the policy is not written in trust, the payout falls into the estate, is subject to intestacy, and can be subject to IHT if the estate is over the threshold. Writing an existing policy in trust takes a single form and no money — most insurers provide the trust deed for free.

ISAs

ISAs belong to the deceased's estate. The Additional Permitted Subscription — a HMRC concession that lets a surviving spouse or civil partner inherit the ISA's tax-free wrapper — is not available to cohabiting partners (HMRC rules on inherited ISAs). Without a will leaving the ISA value to the partner, the funds pass to blood relatives.

Cohabitation in Scotland and Northern Ireland

The UK is not a single legal system. The position differs slightly across the four jurisdictions:

• England and Wales: No cohabitation inheritance rights. 1975 Act available after two years.
• Scotland: Under the Family Law (Scotland) Act 2006, a surviving cohabitant can apply to court within six months for a discretionary award from the estate. The court has wide discretion; there is no fixed entitlement. Still no automatic right; still a will-shaped fix.
• Northern Ireland: Largely follows the England and Wales position. The Inheritance (Provision for Family and Dependants) (Northern Ireland) Order 1979 provides the equivalent court route for cohabitees of at least two years.

Across all four UK jurisdictions, the single common feature is this: a will eliminates the ambiguity. Statutory routes exist as backstops, but they are slower, more expensive, and less generous than a will.

The order of operations for cohabiting couples

If you take only one thing from this page, take this sequence:

1. Write a will — or a pair of mirror wills — naming your partner as beneficiary and executor. This is the single highest-leverage document for a cohabiting UK couple.
2. Confirm property ownership at HM Land Registry. Convert tenants in common to joint tenants if that fits your intentions, or write the will accordingly.
3. Update every pension nomination form to name your partner.
4. Put life insurance in trust for the partner.
5. Review every 3–5 years, or after any major life event (house move, child, separation, new job, inheritance received).

Frequently asked questions

Does a cohabiting partner inherit anything automatically in the UK?

No. The UK intestacy rules do not recognise cohabiting partners. The estate passes to the deceased's blood relatives. Only a will, jointly-held assets, or a nominated pension or life-insurance policy transfers assets to a cohabiting partner without going to court.

How many years do you have to live together to inherit in the UK?

There is no length of cohabitation that creates automatic inheritance rights. Two years gives a partner standing to apply under the Inheritance Act 1975, but that is a contested court claim, not an automatic right.

Is "cohabiting partner" the same as "common law spouse"?

No. "Common law spouse" has no legal meaning in modern UK law. "Cohabiting partner" appears in some statutes (such as the Inheritance Act 1975) to describe a factual living arrangement, but does not confer the rights of a spouse or civil partner.

Can a cohabiting partner inherit a house?

Yes, but only via: (1) joint tenancy (automatic survivorship); (2) a will leaving the property or share to them; or (3) a successful Inheritance Act 1975 court claim. Without one of these, the deceased's share passes to blood relatives under intestacy.

Do cohabiting partners pay inheritance tax to each other?

Yes. The spousal IHT exemption does not apply to cohabiting partners. Each has a £325,000 nil-rate band, but the transferable nil-rate band and unlimited spousal exemption are not available.

Can a cohabiting partner be the executor of the estate?

Only if named in a valid will. Without a will, the right to apply for Letters of Administration follows the intestacy hierarchy, which does not include cohabiting partners.

What is the Inheritance Act 1975?

A statute that allows certain people, including cohabitees of at least two years, to apply to court for reasonable financial provision from the estate. Litigated in court; legal fees typically £15,000–£50,000; conclusion takes 12–24 months. It is a backstop, not an automatic right.

Does Scottish law treat cohabiting partners differently?

Yes — modestly. Under the Family Law (Scotland) Act 2006, a surviving cohabitant can apply to court within six months for a discretionary award. There is still no automatic entitlement, and a will is still the cleanest solution.

What is the single most important document for a cohabiting UK couple?

A will. For two-partner households, a pair of mirror wills. It is the only document that creates inheritance rights between cohabiting partners under UK law.