Wills for Unmarried Couples UK: Why Cohabiting Partners Must Have a Will

If you're living with your partner but not married, there is one legal fact that overrides everything else: in the UK, you have zero automatic inheritance rights. It doesn't matter if you've lived together for 30 years, share a home, have children together, or are each other's next of kin in every practical sense. Without a will, your partner could legally inherit nothing when you die. This is not a technicality. It is the law — and it catches millions of cohabiting couples by surprise every year.

There are approximately 4.5 million cohabiting couples in the UK (ONS 2023). It is the fastest-growing family structure. And it is the group most systematically underprotected by a legal system that still organises inheritance around marriage.

Unmarried Partners Have No Automatic Inheritance Rights — Full Stop

The intestacy rules in England and Wales (the Intestacy Rules 2014) set out exactly who inherits when someone dies without a will. Unmarried partners are not mentioned. The estate passes in this strict order:

1. Children (in equal shares)
2. Parents
3. Full siblings (or their children if they have predeceased)
4. Half-siblings
5. Grandparents
6. Aunts and uncles (full blood)
7. Aunts and uncles (half blood)
8. The Crown (bona vacantia) — if no qualifying relatives exist

Notice who is missing. Your partner of 15 years, with whom you share a mortgage and raised children, is not on this list. If you die without a will, your estate goes to your children (if you have them), then to your parents, then to siblings you may not have spoken to in a decade. Your partner gets nothing — unless they can prove it in court, at significant cost and with no guaranteed outcome.

The one exception: jointly owned property held as joint tenants. If you and your partner own your home as joint tenants (rather than tenants in common), the property passes automatically to the surviving co-owner by the right of survivorship — outside the will and outside the intestacy rules entirely. However, your remaining estate — savings, investments, personal possessions, and any jointly held assets held as tenants in common — is still subject to the intestacy rules. Survivorship on the property does not protect your partner from inheriting nothing from the rest of the estate.

For a full explanation of how intestacy rules work across all UK jurisdictions, see our guide: What Happens If You Die Without a Will in the UK — Intestacy Rules Explained.

The "Common Law Marriage" Myth — Why It's Dangerous

Around half of UK adults believe that cohabiting couples acquire automatic legal rights after a certain period of time — often cited as two years or five years of living together. This belief is not just wrong. It is actively dangerous, because it causes people to delay or skip making a will on the basis of rights they do not have.

Common law marriage does not exist in England, Wales, or Northern Ireland. No length of cohabitation — two years, ten years, forty years — creates any automatic inheritance rights between unmarried partners. The concept is a persistent cultural myth with no foundation in English law. You can live with someone your entire adult life, raise children together, share finances completely, and be entirely devoted to each other — and still have no legal claim on their estate.

This myth persists in part because of terminology. When people hear "common law partner," they assume it means something legally recognised. It doesn't. It is an informal description of a cohabiting relationship with no legal definition and no legal consequences for inheritance purposes.

Scotland is different — but not by much. The Family Law (Scotland) Act 2006 gives cohabiting partners limited rights to claim from the estate of a deceased partner. However, these rights must be actively claimed in court within six months of the date of death (not the date of confirmation). The court has discretion and is not obliged to award anything. Claims are expensive and uncertain. The Act provides a last resort — not a substitute for making a will.

The Inheritance Act 1975: A Safety Net With a High Toll

The Inheritance (Provision for Family and Dependants) Act 1975 was amended in 1995 to allow cohabiting partners to make a claim against the estate — provided they lived together in the same household for at least two years immediately before the date of death, as husband and wife or as civil partners.

This sounds like protection. In practice, it is an expensive, uncertain, and emotionally gruelling alternative to having a will.

• Cost: Claims typically cost between £10,000 and £50,000+ in legal fees. If the estate is contested by the deceased's family, costs on both sides escalate significantly.
• Time: Claims can take one to three years to resolve. During this period, estate assets may be frozen.
• Standard of provision: The court awards "reasonable financial provision" on a maintenance standard for cohabiting partners — not full inheritance. The claimant must prove both eligibility and financial need.
• Uncertainty: Courts have complete discretion. There is no guaranteed outcome. The deceased's family can and often does contest the claim.
• The two-year rule: If the couple lived together for less than two years immediately before the death, there is no claim under the Act at all. Periods of separation can break the qualifying period.

Making a will costs £99–£179 and takes 30 minutes. It is legally certain. The Inheritance Act is none of these things. It exists as a last resort for cases where a will was not made — it is not a reason to avoid making one.

What to Include in Your Will as an Unmarried Couple

Name your partner as primary beneficiary. This is the core purpose of making a will as a cohabiting couple. Your partner should inherit your residuary estate — everything after debts, taxes, and any specific gifts. Without this clause, they inherit nothing under intestacy.

Appoint your partner as executor. Name your partner as your primary executor — the person responsible for administering your estate, applying for probate, and distributing your assets. Name a backup executor in case your partner predeceases you or is unable to act.

Consider a life interest trust if you have children from a previous relationship. If you want to protect your partner while ensuring your children from a previous relationship ultimately inherit, a life interest trust allows your partner use of your estate (including the right to live in the family home) during their lifetime, with the capital passing to your children on their death. This prevents your estate from ultimately passing to your partner's family if they later remarry.

Name guardians for your children. If you have children under 18, your will should name a guardian to care for them if both you and the other parent die while they are minors. This is one of the most important clauses in any parent's will.

Update pension and life insurance nominations. Pensions, death-in-service benefits, and life insurance policies do not pass under your will — they are governed by separate nomination forms with your pension provider or insurer. If you have not updated these since your relationship began, your partner may not be the named beneficiary. Check and update these independently of your will.

Review your property ownership structure. Check whether you own your home as joint tenants (survivorship applies — partner inherits automatically) or tenants in common (your share enters the estate and passes per your will or intestacy). If you are tenants in common without a will, your partner does not automatically inherit your share of the property — your family does.

Mirror Wills for Unmarried Couples

Mirror wills are two independent wills made by a couple where each leaves their estate to the other, with the same backup beneficiaries. For unmarried couples, they are not just useful — they are the most efficient solution available.

Each will is a separate legal document signed independently. Either partner can update or revoke their will at any time without notifying the other — this is the key feature that distinguishes mirror wills from mutual wills (which create a binding agreement that neither party will change the distribution after the first death). For most couples, mirror wills are the right choice because they preserve flexibility.

ClearWill's mirror wills package is £179 for both wills, covering all three UK jurisdictions. For full detail on how mirror wills work, see our complete guide: Mirror Wills for Couples UK — What They Are, How They Work & Cost.

Inheritance Tax: The Hidden Penalty for Unmarried Couples

Married couples and civil partners benefit from the spousal IHT exemption — transfers between spouses are completely free of inheritance tax, in any amount, during lifetime and on death. There is also a transferable nil-rate band: when the first spouse dies, any unused nil-rate band transfers to the survivor, giving the combined estate a threshold of up to £1 million (including the residence nil-rate band).

None of this applies to unmarried partners.

Feature	Married Couples	Unmarried Couples
Spousal IHT exemption	✅ Unlimited tax-free transfers	❌ Does not apply
Nil-rate band (per person)	£325,000	£325,000
Transferable nil-rate band	✅ Unused band transfers on first death	❌ Does not apply
Residence nil-rate band transfer	✅ Transfers to survivor	❌ Does not transfer between partners
Effective combined IHT threshold	Up to £1,000,000	£325,000 per person only

This difference can be enormous. A married couple with a joint estate of £1 million might pay zero IHT. An unmarried couple with the same estate could pay hundreds of thousands of pounds in tax — on assets they want to pass to each other.

Planning strategies for unmarried couples include: life insurance policies written in trust (the payout falls outside the estate and passes directly to the named beneficiary, free of IHT); holding the family home as tenants in common with nil-rate band trusts in each will; and maximising annual gift allowances during lifetime. For full detail, see: Inheritance Tax UK 2026 — Thresholds, Nil-Rate Band & How to Plan.

Scotland: Cohabitation Rights Under the Family Law (Scotland) Act 2006

Scotland operates under entirely different succession law. Under section 29 of the Family Law (Scotland) Act 2006, a surviving cohabiting partner may apply to the court for a financial award from the deceased partner's estate. The application must be made within six months of the date of death — an absolute deadline, not subject to extension.

The court considers what the survivor would have received had they been married; the period and nature of the cohabitation; any financial benefit the survivor received from the deceased; and the extent to which the survivor contributed to the deceased's estate. The court has complete discretion and is not obliged to award anything. The award cannot exceed what the survivor would have received as a spouse under intestacy — it is a cap, not a floor.

Scotland's "legal rights" system (prior rights and legal rights that give spouses and children automatic claims on the estate) does not apply to unmarried partners. The six-month window is unforgiving. And even a successful claim is expensive and uncertain. For cohabiting couples in Scotland, making a will is as urgent — arguably more urgent — than anywhere else in the UK.

Northern Ireland

Northern Ireland follows rules closely analogous to England and Wales. There is no common law marriage recognition. The Inheritance (Provision for Family & Dependants) (NI) Order 1979 allows cohabiting partners to claim from the estate after at least two years of cohabitation immediately before death — with the same limitations as the 1975 Act: expensive, uncertain, maintenance-standard only, and not a substitute for a will.

The intestacy rules in Northern Ireland differ slightly from England and Wales — the statutory legacy for a surviving spouse is £450,000 (higher than England), and administration proceeds through the Probate and Matrimonial Office rather than the Probate Registry. But for unmarried partners, the position is identical: no will means no inheritance.

Practical Steps to Protect Your Partner Today

1. Make your will. This is the single most important action. A will naming your partner as primary beneficiary is the only reliable way to ensure they inherit your estate. See: How to Write a Will UK — Complete 2026 Guide.
2. Update pension and death-in-service nominations. Log in to your pension portal and check who is nominated. If it is a former partner or no one — update it immediately. These assets pass entirely outside your will.
3. Check your property ownership structure. Confirm whether you own as joint tenants or tenants in common. If tenants in common, your share must be addressed in your will or your family will inherit it instead of your partner.
4. Consider life insurance written in trust. A policy in trust pays directly to your partner without probate delay and without forming part of your taxable estate.
5. Take the free assessment. ClearWill's Will Readiness Assessment takes under two minutes, identifies your specific gaps, and gives you a personalised action plan.

If you have an existing will that does not name your current partner, review it now. An out-of-date will is as dangerous as no will at all. For guidance on updating, see: How to Update or Change Your Will — Codicils & Revocation.

Frequently Asked Questions

Do unmarried couples have automatic inheritance rights in the UK?

No. Cohabiting partners have zero automatic inheritance rights under the intestacy rules in England, Wales, or Northern Ireland, regardless of the length of the relationship. Without a will, a surviving partner can inherit nothing. Scotland has limited cohabitation rights under the Family Law (Scotland) Act 2006, but these must be actively claimed in court within six months of death.

Is common law marriage recognised in the UK?

No. Common law marriage does not exist as a legal status in England, Wales, or Northern Ireland. No cohabitation period — 2 years, 5 years, 20 years — automatically creates inheritance rights. The term "common law partner" is informal and has no legal meaning for succession purposes in these jurisdictions.

What happens to an unmarried partner's estate if they die without a will?

The estate passes under the intestacy rules: children first, then parents, then siblings, then grandparents, then aunts and uncles, and finally to the Crown. An unmarried partner inherits nothing. The only exception is property held as joint tenants, which passes by survivorship to the co-owner automatically — outside the estate and outside the intestacy rules.

Can an unmarried partner claim under the Inheritance Act?

Yes, if they lived with the deceased for 2+ years immediately before death. But claims cost £10,000–£50,000+ in legal fees, take years, offer no guarantee of success, and provide only maintenance-standard provision. A will costs £99–£179 and is legally certain. See our full guide: Contesting a Will UK — Grounds, Process & How to Protect Your Estate.

Do cohabiting couples need mirror wills?

Yes — they need them more urgently than married couples. Without wills, a cohabiting partner inherits nothing under UK intestacy rules. Mirror wills are two independent documents where each partner leaves their estate to the other. ClearWill offers mirror wills at £179 for both, covering all three UK jurisdictions.

Does the spousal inheritance tax exemption apply to unmarried couples?

No. The spousal IHT exemption (unlimited tax-free transfers between spouses) and the transferable nil-rate band do not apply to unmarried partners. Each partner uses only the standard £325,000 nil-rate band, with no transfer on first death. Unmarried couples with combined assets above this threshold face significantly higher IHT bills than equivalent married couples. See: Inheritance Tax UK 2026 — Thresholds, Nil-Rate Band & How to Plan.

Related: What Happens If You Die Without a Will — Intestacy Rules | Mirror Wills for Couples UK — Complete Guide | Inheritance Tax UK 2026 — Thresholds & Planning | Contesting a Will UK