Buying a House With a Partner in the UK: The Debt You Both Take On

A joint mortgage is the biggest secured debt most UK adults ever sign for, and it is signed with the person they least expect the debt to matter with. In law, though, the lender does not see two half-borrowers. It sees one account with two names, and each of you is legally liable for the whole balance.

The romance of buying a house together sits on top of a hard piece of financial machinery. Joint and several liability, joint tenants versus tenants in common, and the absence of "common law marriage" in England and Wales all shape what happens if income drops, the relationship ends, or one of you dies. This article covers what that machinery does, so you can go in with your eyes open.

This is general UK information about joint mortgage debt and the legal position of co-owners. It is not personal financial advice, regulated debt advice, or legal advice. For advice on your specific circumstances, use a qualified solicitor or an FCA authorised organisation.

Joint and several liability, in plain English

Every joint mortgage in the UK is built on the same legal principle: joint and several liability. It means each borrower is liable for the whole debt, not just their share of it.

Say you and your partner take out a £250,000 mortgage together and split repayments 50/50 by informal agreement. If your partner stops paying their half, your bank does not knock on their door for £625 a month and yours for the other £625. It knocks on both doors for the full £1,250, and it can go after either of you for the whole missed amount, plus arrears, plus fees.

This is not a lender being unreasonable. It is how the mortgage contract is written. The bank lent to both of you as a single borrower unit, and each of you agreed to be responsible for the full sum. That does not change because you have a private understanding about who pays what.

The same principle runs through most jointly signed credit: joint bank overdrafts, joint credit cards, joint loans. It is more visible on a mortgage because the sums are larger and the debt runs longer, but the underlying rule is identical.

What a missed payment does to both credit files

On a joint mortgage, missed payments are recorded on both borrowers' credit files, not just the one who was meant to pay that month. Under UK reciprocal credit reporting principles used by the main credit reference agencies (Experian, Equifax and TransUnion), a joint account behaves as one account with two data-holders.

In practice that means:

• One missed payment shows on both files as a status 1 arrears marker.
• Three or more missed payments can lead to a default marker on both files.
• Arrears and default markers usually stay on a credit file for six years from the date of the missed payment or the default.
• If the lender applies for a charging order or, in serious cases, court possession proceedings, both borrowers appear in those records.

The uncomfortable version: if your partner disappears mid-mortgage and you cannot cover their share on your own for even one month, your credit file gets the same damage theirs does. That is the point where a lot of relationship-ending disputes turn into long-term borrowing problems for the person who stayed.

The "common law marriage" myth

The single biggest legal misunderstanding among unmarried couples buying a home together is the belief that after enough years of living together, or after having children, the law treats you as if you were married. It does not.

The House of Commons Library briefing "Common law marriage" and cohabitation (SN03372) states plainly: "A couple living together in a stable intimate relationship are sometimes referred to as common law spouses, but this is incorrect in law in England and Wales. Although cohabitants do have some legal protection in several areas, cohabitation gives no general legal status to a couple, unlike marriage and civil partnership from which many legal rights and responsibilities flow."

The Women and Equalities Committee reached the same conclusion in its 2022 report on the rights of cohabiting partners: "Notwithstanding the legal reality, many people believe in the so-called 'common law marriage myth', which is the erroneous belief that after a certain amount of time of living together, the law treats cohabitants as if they were married."

Cohabiting-couple families are also not a minority group. According to the ONS Families and Households bulletin 2022, cohabiting-couple families accounted for 19% of all UK families in 2022, and opposite-sex cohabiting-couple families were the fastest growing family type over the previous decade (3.6 million families, up from 2.9 million in 2012).

That matters for debt because unmarried co-owners do not get the automatic legal protections that married couples and civil partners have on separation or death. On separation, the courts have no power to divide the property "fairly" as they might on divorce. Ownership is decided strictly by what the title deeds say and what the trust of land rules produce (Commons Library SN03372, property rights section). On death, an unmarried surviving partner has no automatic right to inherit their partner's estate.

Joint tenants vs tenants in common

When you buy a property with someone else in England or Wales, you have to choose how you hold it. GOV.UK sets out the two options on its joint property ownership overview:

Joint tenants

• You have equal rights to the whole property.
• The property automatically goes to the other owners if you die.
• You cannot pass on your ownership of the property in your will.

Tenants in common

• You can own different shares of the property.
• Your share of the property does not automatically go to the other owners if you die.
• You can pass on your share of the property in your will.

What this choice actually decides

Neither structure changes the mortgage debt itself. Both borrowers remain jointly and severally liable for the whole loan whichever ownership type you choose. What changes is what happens to the property share on death, and how the courts view contribution in a dispute.

GOV.UK also confirms you can change from joint tenants to tenants in common later, for example if the relationship changes or if you want to leave your share to someone else. There is no fee to sever the joint tenancy. This is worth knowing: a lot of couples buy as joint tenants by default and only think about tenants in common much later.

What happens to the debt if you split up

Ending the relationship does not end the mortgage. The bank still has a contract with both of you. Until the loan is settled or one of you is legally removed, both names remain on the debt.

There are only a handful of options once you separate:

• Sell the property. Pay off the mortgage from the sale proceeds. If the sale does not clear the balance, both of you remain jointly and severally liable for the shortfall as an unsecured debt.
• One of you remortgages solo. The staying partner applies for a new mortgage on their own, and if they meet the affordability criteria the departing partner is removed from the title through a transfer of equity. The lender has to agree, based on the sole borrower's income and credit file.
• Keep the joint mortgage running. Some couples do this temporarily while children are young or the market is bad. Legally, both stay liable, both stay on the credit file, and any missed payment still hits both credit files.
• Court application under TOLATA. Under the Trusts of Land and Appointment of Trustees Act 1996, either co-owner can apply to the court to decide what happens to a jointly owned property when the co-owners cannot agree. See our article on what an order for sale in the UK is and how it works.

The rough part is that none of these routes closes down joint and several liability by itself. Until the lender formally releases one borrower, or the mortgage is cleared, both credit files are still exposed to what the other person does or does not pay.

Before you sign, check five things

Because the mortgage locks you into 25 or more years of joint financial exposure, the useful work happens before completion, not after. Five checks worth making, honestly, before you sign:

1. Both credit files, side by side

Mortgage lenders will pull both credit reports and look at defaults, CCJs, IVAs, bankruptcy and payment history from the past six years. Ask your partner to pull their statutory report from all three credit reference agencies (Experian, Equifax, TransUnion). Look at it together. A default on one file affects the rate and loan-to-value ratio you both get offered, not just the file it sits on.

2. Existing debt on both sides

Debts in your sole name stay yours. But they count in the lender's affordability calculation for the joint mortgage. A partner with £15,000 of credit card debt on 22% APR is spending money each month that then cannot service a mortgage payment. That reduces what you can borrow together and, more importantly, the cushion you have if one income drops.

3. Whether either income is stable

The mortgage payment has to fit around your joint income today and around the risk that either of you loses your job, changes career, or takes parental leave for months at a time. Ask the harder question: if only one of us was earning for six months, could we still pay the mortgage without falling into arrears? If the honest answer is no, the loan is too big.

4. Ownership type, chosen deliberately

Do not accept the default. If you are contributing unequal deposits, if either of you has children from a previous relationship, or if you want the ability to leave your share to someone other than the other owner, tenants in common is usually the sensible structure. If you specifically want automatic survivorship, joint tenants makes sense. This is a decision worth having before completion, not after.

5. Whether a written record of your intentions exists

For unmarried couples, a cohabitation agreement or a Declaration of Trust records what each of you contributed and what should happen in various scenarios. It is not a substitute for how the property is registered at HM Land Registry, but it can help evidence intentions if the relationship breaks down and there is a dispute. A solicitor can draft one at the same time as the conveyancing. The House of Commons Library briefing on cohabitation notes that cohabitants may enter into a cohabitation agreement, and this can act as evidence of what the parties intended.

If it is already going wrong on a joint mortgage

If you already own the property and things are shifting, the first step is stop making it worse. Joint mortgage debt does not resolve itself by hoping the other person pays their share.

• Do not stop paying to force a decision. Missed payments hurt both of you equally on the credit file. The problem you are trying to solve is a legal or relationship problem, not a mortgage problem.
• Talk to the lender before arrears build. Most UK mortgage lenders have forbearance options: payment holidays, term extensions, temporary interest-only. Use them before a default marker appears rather than after.
• Get the ownership structure clear. If you are joint tenants and the relationship is over, seriously consider severing to tenants in common (there is no fee, per GOV.UK) so that your share can pass under your will rather than automatically to the other person if you die.
• See a solicitor before making any final property decision. If you are separating, the property split, any Declaration of Trust and the mortgage removal all interact. This is not a DIY area.

If arrears letters have already started, our article on whether you should call or write to a debt collector covers why written contact is safer than phone contact, and our guide on how to complain about a bank or debt collection agency walks through the process if the lender is not treating you fairly. If a charging order has been mentioned or applied for, see what a charging order is and how to stop it and what an order for sale is and can I stop it.

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