Comparison · Family Finance · 2026
Cohabitation Agreement vs Marriage UK 2026: Legal and Financial Protection
Despite the popular myth of "common law marriage", unmarried couples in England and Wales have almost no automatic legal or financial protection from each other. A cohabitation agreement can fill some of that gap by contract, but it cannot replicate every right that marriage confers automatically. Here is how they compare for 2026.
TL;DR - 30-Second Summary
- - Cohabitation agreement: a contract that can set out property, finance and separation terms — but confers no automatic pension, inheritance or IHT rights
- - Marriage: gives automatic spousal IHT exemption, intestacy inheritance rights, and court discretion to divide pensions and assets fairly on divorce
- - "Common law marriage" is a myth — cohabiting couples have no automatic claim on each other regardless of relationship length
Side by Side: Cohabitation Agreement vs Marriage
| Feature | Cohabitation Agreement | Marriage |
|---|---|---|
| Property division terms | Set by contract in advance | Determined by court discretion on divorce |
| Automatic pension claim on separation | None | Court can order pension sharing/offsetting |
| Intestacy inheritance rights | None — need a will | Automatic under intestacy rules |
| Spousal Inheritance Tax exemption | Not available | Unlimited exemption between spouses |
| Spousal maintenance on separation | Not available | Court can order maintenance |
| Legal cost to set up | £500-£1,500 per person | Wedding cost + optional prenup |
| Enforceability | Binding contract if properly drafted | Subject to court discretion (statutory framework) |
The "Common Law Marriage" Myth
Surveys repeatedly find a large proportion of UK adults mistakenly believe that living together for a certain number of years creates "common law" marital rights. It does not, and never has, in England and Wales. Regardless of how long a couple lives together, or how many children they have, cohabiting partners have no automatic right to maintenance, no automatic share of each other's pension, and no automatic inheritance if their partner dies without a will.
What a Cohabitation Agreement Can (and Cannot) Do
A cohabitation agreement can set out, in advance, how jointly owned or single-name property should be divided if the relationship ends, how household bills and mortgage payments are shared, and what happens to joint savings or debts. This gives unmarried couples a level of certainty and protection that would otherwise depend on complex and expensive trust law litigation.
However, a cohabitation agreement cannot create rights that only exist through marriage in law — it cannot give a partner an automatic intestacy inheritance, spousal Inheritance Tax exemption, or a statutory right to spousal maintenance. Those protections require marriage or civil partnership, or separate planning tools like a will, trust or life insurance written in trust.
What Should Cohabiting Couples Do?
A cohabitation agreement helps if...
- - You are not planning to marry but want clarity on property and finances
- - One partner contributed more to a jointly owned home
- - You want to avoid costly trust law disputes if you separate
Consider marriage (or a will alongside it) if...
- - You want automatic inheritance and Inheritance Tax protection
- - You want the court's discretionary powers to divide pensions/assets available
- - You want the strongest possible legal recognition of your relationship
Frequently Asked Questions
Is "common law marriage" a real legal status in the UK?
No — this is one of the most persistent myths in UK family law. There is no such thing as "common law marriage" in England and Wales, no matter how long a couple has lived together. Cohabiting partners have no automatic right to each other's property, pension, or financial support simply by virtue of living together, even after decades and children.
What is a cohabitation agreement?
A cohabitation agreement (sometimes called a "living together agreement") is a legal contract between an unmarried couple setting out how property, finances, debts and possessions should be divided if the relationship ends. Because cohabiting couples have no automatic financial claims on each other under family law, this agreement is often the only way to secure fair treatment without going to court.
What happens to jointly owned property without a cohabitation agreement?
Without an agreement, a cohabiting couple's jointly owned property is generally divided according to strict property and trust law (the Trusts of Land and Appointment of Trustees Act 1996), which can be complex, expensive and slow to resolve compared with the more flexible discretionary approach courts take on divorce. If only one partner is on the property title, the other may have no claim at all unless they can prove a financial contribution or common intention through litigation.
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Does marriage automatically give a spouse rights to the other's pension?
Not automatically during the marriage, but on divorce, a spouse's pension becomes a matrimonial asset the court can divide through pension sharing, attachment or offsetting. A cohabiting partner has no equivalent right on separation — whatever pension each partner has built up stays entirely their own, regardless of relationship length.
What happens if a cohabiting partner dies without a will?
Under the intestacy rules, a surviving cohabiting partner has no automatic right to inherit anything from their partner's estate, no matter how long they lived together — the estate passes to blood relatives (children, parents, siblings) according to a strict legal order. A surviving spouse, by contrast, automatically inherits under intestacy rules even without a will. Cohabiting couples need a will to protect each other, and may still need to consider a possible claim under the Inheritance (Provision for Family and Dependants) Act 1975 if excluded.
Does marriage give automatic Inheritance Tax advantages a cohabitation agreement cannot replicate?
Yes. Transfers between spouses (and civil partners) are exempt from Inheritance Tax regardless of amount, and a surviving spouse can inherit the deceased's unused nil-rate band. Cohabiting couples get none of this — gifts or inheritances between unmarried partners above the £325,000 nil-rate band can be taxed at 40%, and no cohabitation agreement can create a spousal IHT exemption; only marriage or civil partnership does.
How much does a cohabitation agreement cost compared to the cost of a divorce settlement dispute?
A properly drafted cohabitation agreement with independent legal advice for each partner typically costs from around £500-£1,500 per person for straightforward cases. This is usually far less than the cost of contested litigation if an unmarried couple separates without any agreement and has to resolve property or financial disputes through the courts, which can run into many thousands of pounds.
Is a cohabitation agreement legally binding?
Yes, provided it is properly drafted as a deed, both parties received independent legal advice, there was full financial disclosure, and neither party was under duress — a cohabitation agreement is a straightforward contract and, unlike a prenuptial agreement, is not subject to the same family court discretion, making it generally more reliably enforceable.
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Disclaimer: This is educational information, not legal advice. Family law and inheritance rules for cohabiting couples are complex and highly fact-specific. Seek advice from a family law solicitor and consider making a will regardless of your relationship status. For official guidance see gov.uk/living-together-marriage-civil-partnership.
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