The 'Common Law Marriage' Myth: Financial Risks for Cohabiting Couples in 2026
There is no such thing as 'common law marriage' in England and Wales — living together for any number of years gives you none of the automatic financial protections married couples get. Here's exactly what that means for money, property and inheritance.
The Myth, and Why It Persists
Surveys consistently find that a large proportion of people in England and Wales believe "common law marriage" is a real legal status that grants automatic rights to unmarried couples who live together for a sufficient period. It is not, and never has been, part of UK law. There is no length of cohabitation — not 2 years, not 7 years, not 20 years — that automatically grants a cohabiting partner the legal protections a marriage or civil partnership provides.
This matters because the financial consequences of the myth are real: couples who believe they're protected often don't take the practical steps (wills, cohabitation agreements, clear property ownership documentation) that would actually protect them.
Property: What Actually Happens on Separation
| Ownership Situation | What Happens If the Couple Splits |
|---|---|
| Property in joint names, no Declaration of Trust | Usually split 50/50 by default (as "joint tenants"), regardless of who paid more |
| Property in joint names, with a Declaration of Trust specifying shares | Split according to the recorded shares (e.g. 70/30) |
| Property in one partner's sole name | The other partner generally has no automatic claim, even after years of contributing to the mortgage, bills or renovations, unless they can establish a "constructive" or "resulting" trust through court action — a difficult, costly and uncertain legal process |
This is fundamentally different from divorce, where a court has wide discretion to divide matrimonial assets fairly regardless of whose name is on the title, based on needs, contributions and other factors. Cohabiting couples get none of that discretion — ownership and provable contribution are what matter, assessed under property and trust law.
Inheritance: No Automatic Entitlement
If a cohabiting partner dies without a valid will (dying "intestate"), the intestacy rules distribute the estate to specified relatives in a fixed legal order: spouse/civil partner first (if applicable), then children, then parents, then siblings, and so on. An unmarried partner is not included anywhere in this order, regardless of relationship length or how financially interdependent the couple was.
A surviving cohabiting partner may be able to bring a claim under the Inheritance (Provision for Family and Dependants) Act 1975 if they were financially dependent on the deceased, but this requires:
- Court action, which is costly and stressful, often at an already difficult time.
- No guarantee of success — the court has discretion, not an obligation, to make an award.
- Proof of dependency or cohabitation status, which can be contested by other relatives.
The single most effective protection: both partners making a valid, up-to-date will that explicitly provides for each other. Without one, the surviving partner's financial security depends entirely on the goodwill (or absence of dispute) of the deceased's blood relatives.
Tax and Benefit Differences From Married Couples
| Benefit | Available to Married/Civil Partners | Available to Cohabiting Couples |
|---|---|---|
| Marriage Allowance (10% Personal Allowance transfer) | Yes | No |
| Spousal exemption from Inheritance Tax on transfers | Yes — unlimited, tax-free | No — gifts between cohabiting partners are subject to normal IHT gifting rules (Potentially Exempt Transfers, 7-year rule) |
| No gain/no loss CGT transfers between partners | Yes | No — a transfer of an asset between cohabiting partners can trigger a real CGT liability |
| Automatic pension survivor benefits | Often yes, scheme-dependent | Sometimes, only if scheme rules allow and nomination made — never automatic |
| Intestacy inheritance rights | Yes | No |
The CGT point often surprises couples: transferring, say, a share portfolio or a share of a rental property between spouses is CGT-neutral, but the same transfer between cohabiting partners is a normal disposal, potentially triggering a real tax bill.
Practical Steps Cohabiting Couples Can Take
- Make wills — the single most important step, ensuring each partner is explicitly provided for.
- Consider a cohabitation agreement — sets out property ownership, contribution splits, and what happens on separation; carries real weight with courts if properly drafted with independent legal advice for each partner.
- Use a Declaration of Trust for jointly owned property — records the actual ownership split, especially important if contributions were unequal.
- Check pension scheme nomination forms — complete an "expression of wishes" form naming your partner, as many schemes won't pay survivor benefits to a cohabiting partner without one.
- Understand the CGT and IHT gifting implications before transferring significant assets between each other, since the spousal exemptions simply don't apply.
- Consider marriage or civil partnership if the couple wants the full suite of automatic legal and tax protections — it remains the only way to access them in full.
The financial risks of assuming "common law marriage" protection are significant and entirely avoidable with a small amount of proactive paperwork — the gap between assumed and actual legal protection is one of the more consequential misunderstandings in UK personal finance.
Frequently asked questions
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