When a co-owner stops paying their share of the mortgage, you remain fully liable for the entire debt, not just your half. Contact your lender within 24 hours, keep making payments if you can, and seek legal advice immediately. Both names on the mortgage mean both parties are responsible, regardless of who lives in the property or who agreed informally to pay what.
Here is what to do in the next 24–72 hours:
- Contact your lender and explain the situation before a missed payment is recorded
- Keep paying the full mortgage if you can afford to, even temporarily
- Request a payment arrangement, mortgage holiday, or interest-only period from the lender
- Document every communication with your co-owner and the lender in writing
- Contact a solicitor and ask about mediation as a first step
Pro Tip: Lenders treat all names on a mortgage as a single unit when reporting to credit agencies. A missed payment harms every named borrower's credit file, not just the person who stopped paying. Acting before the payment date is always better than acting after.
Key takeaways
Both co-owners remain fully liable for the entire mortgage debt the moment one stops paying, and protecting your credit file and the property must come before any other action.
| Point | Details |
|---|---|
| Joint and several liability | The lender can pursue either borrower for the full mortgage debt, regardless of private payment agreements. |
| Act within 72 hours | Contact your lender, keep paying if you can, and document everything before a missed payment is recorded. |
| Mediation before court | Mediation resolves many disputes faster and at a fraction of the cost of TOLATA proceedings. |
| Evidence is decisive | Bank statements, deposit records, and written agreements are essential for any TOLATA claim or equitable accounting. |
| Cohaus reduces this risk | Cohaus co-buyers agree legal protections and exit terms before purchase, turning a potential crisis into a managed process. |
Table of Contents
- What does UK law say about joint mortgage liability?
- What to do in the first 72 hours after a co-owner stops paying
- What your lender can and will do
- What are your longer-term options for resolving the situation?
- Should you try mediation before going to court?
- What documents do you need to gather now?
- How to reduce risk before you co-own: agreements and safeguards
- Tax and financial implications of removing a co-owner or selling
- How does divorce or separation affect your mortgage responsibilities?
- Insurance considerations when a co-owner stops paying
- The part of this that most guides understate
- Co-buying with built-in protections: how Cohaus approaches this
- Sources
What does UK law say about joint mortgage liability?
Under UK law, joint mortgagors are jointly and severally liable for the full mortgage debt.
Many co-owners mistakenly believe they are only responsible for their percentage share. According to Ashworths Solicitors, the mortgage contract typically makes each borrower fully liable for the entire debt. A private split-the-bill arrangement does not bind the lender at all.
The key statute here is the Trusts of Land and Appointment of Trustees Act 1996 (TOLATA), which governs how courts handle disputes over jointly owned property. Under TOLATA, a court can :
- Declare each party's beneficial interest in the property
- Order a sale, or delay a sale, depending on the circumstances
- Account for unequal mortgage payments through equitable accounting
- Award occupation rent where one party has excluded the other
It is worth being clear about the distinction between legal title and the mortgage contract. Your name on the title deeds determines ownership; your name on the mortgage determines liability to the lender. These can differ, particularly in joint borrower, sole proprietor arrangements. Shelter England confirms that names on the mortgage are decisive for liability, not who occupies the property.
Where there is a joint mortgage, the lender can require the remaining co-owner to cover all payments. Liability follows the mortgage contract, not the living arrangements.
If you have been covering payments on behalf of a co-owner who has stopped paying, you may have a right of indemnity or a beneficial claim for those overpayments. Securing that claim, however, usually requires a court declaration if the other party disputes it.
What to do in the first 72 hours after a co-owner stops paying
Speed matters here. Every day without action increases the risk of arrears, credit damage, and a lender escalating to formal proceedings.
- Contact your lender today. Explain that your co-owner has stopped contributing. Ask specifically about payment arrangements, a temporary interest-only period, a mortgage holiday, or a term extension. Lenders have a duty under FCA rules to treat borrowers fairly, and most will offer options before pursuing possession.
- Confirm the arrears status. Ask the lender to confirm in writing whether any payment has been missed and what the current balance is.
- Keep paying if you can. Covering the full payment temporarily protects both your credit file and the property. You can pursue your co-owner for their share separately.
- Log every communication. Date-stamp emails, take screenshots of messages, and keep a written record of every phone call, including who you spoke to and what was agreed.
- Contact a solicitor. Even a single initial consultation clarifies your options quickly. Many solicitors offer a free or fixed-fee first call.
- Ask about mediation. A mediator can help you and your co-owner reach a practical agreement without going to court. Setfords' TOLATA guide notes that mediation resolves many co-ownership disputes more quickly and cheaply than contested proceedings.
Pro Tip: Ask your lender to note on the account that you contacted them proactively. This can be relevant if possession proceedings are ever considered, as courts take a borrower's conduct into account.
What your lender can and will do
Once a payment is missed, lenders follow a fairly predictable escalation path. Understanding it helps you stay ahead of it.
Your lender's likely sequence of actions:
- Send an arrears letter after the first missed payment
- Add default charges and administration fees to the account
- Report the missed payment to credit reference agencies (Experian, Equifax, TransUnion), affecting all named borrowers
- Offer a formal arrears management plan
- Instruct solicitors and begin possession proceedings if arrears persist, typically after three to six missed payments
- Apply to court for a possession order and, ultimately, repossession
MoneySavingExpert confirms that missed payments affect both parties' credit files and can lead to repossession, regardless of which borrower stopped paying.
When you speak to your lender, ask these specific questions:
- Can we switch to interest-only payments temporarily?
- Is a mortgage payment holiday available, and for how long?
- Can the term be extended to reduce monthly payments?
- What is the formal arrears process and at what point do you instruct solicitors?
Pro Tip: Put every lender conversation in writing afterwards. Send a brief email summarising what was discussed and agreed. This creates a paper trail that protects you if the lender's records differ from your recollection.
What are your longer-term options for resolving the situation?
Once the immediate crisis is managed, you need a longer-term solution. The main routes are below, with honest trade-offs for each.
Remortgage to sole name
You apply to take over the mortgage alone. The lender runs a fresh affordability assessment based on your income only. If you pass, your co-owner is released from the mortgage and the title is transferred. This is the cleanest solution but requires you to qualify on your own.
- Realistic timescale: 6–12 weeks
- Costs: Solicitor fees, valuation, possible early repayment charge
- When it works: You earn enough to service the mortgage alone and have sufficient equity
Transfer of equity or buy-out
Your co-owner transfers their share to you (or to a new co-buyer) in exchange for a payment. The lender must approve the transfer, and a solicitor handles the conveyancing. A formal valuation determines the buy-out figure.
- Realistic timescale: 8–16 weeks
- Costs: Valuation, solicitor fees, possible stamp duty if the transfer triggers a liability
- When it works: Both parties agree on the value and the terms
Selling the property
A mutual sale is often the most straightforward exit when neither party can or wants to take on the mortgage alone.
- Realistic timescale: 3–6 months
- Costs: Estate agent fees, solicitor fees, possible Capital Gains Tax
- When it works: Both parties agree to sell; or a court orders sale under TOLATA
Replacing a borrower
Some lenders allow a co-owner to be replaced by a new borrower, subject to affordability checks on the incoming party. This is less common than a full remortgage but can work where a new co-buyer is ready. See Cohaus's guide on joint mortgages with friends for lender criteria.
Court orders under TOLATA
If negotiation and mediation fail, TOLATA proceedings allow a court to declare beneficial interests, order a sale, and account for unequal contributions. This is the last resort, not the first.
- Realistic timescale: 12–24 months for a contested claim
- Costs: Solicitor and barrister fees, court fees; contested Part 7 claims can run to tens of thousands of pounds
- When it works: All other routes have failed or the other party is uncooperative
Pro Tip: If you have been paying more than your share, keep a running total with bank statement evidence. A court can order equitable accounting for those overpayments, but only if you can prove them.
Should you try mediation before going to court?
Yes, in almost every case. Mediation is faster, cheaper, and confidential. A skilled mediator helps both parties reach a workable agreement without the adversarial cost of litigation.
Court is appropriate when:
- Your co-owner refuses to engage with mediation or negotiation
- Beneficial ownership is genuinely disputed and cannot be resolved without a declaration
- Unequal contributions need to be settled formally
- The other party is taking steps that risk the property (e.g., allowing repossession)
On procedure: CPR Part 8 applies to straightforward TOLATA matters where facts are not in dispute. Where beneficial ownership or financial contributions are contested, CPR Part 7 is required, which involves full disclosure, witness statements, and significantly higher costs. A solicitor will advise which route applies to your situation.
Pro Tip: Courts now expect parties to have attempted mediation before issuing proceedings. Refusing mediation without good reason can affect how a judge views costs at the end of a case.
What documents do you need to gather now?
Strong evidence is the foundation of any negotiation, mediation, or court claim. Gather these as soon as possible:
- Mortgage statements showing payment history and current balance
- Bank statements evidencing your contributions to mortgage payments
- Deposit records: bank transfers, conveyancing completion statements, gifted deposit letters
- The original conveyancing file, including the transfer deed and any declaration of trust
- Written agreements, texts, emails, or messages about who would pay what
- Invoices or receipts for property improvements you funded
- Any correspondence with the lender about arrears or payment arrangements
Setfords advises that solicitors consider this documentary evidence essential for TOLATA claims and equitable accounting. Informal agreements rarely override the lender's contract, so the paper trail of actual payments carries the most weight.
Common gaps that weaken a claim include missing bank authorisation records, cash payments with no paper trail, and reliance on verbal agreements that the other party denies. Where gaps exist, corroborating witness statements from people who knew about the arrangement can help.
Pro Tip: Create a simple spreadsheet logging every mortgage payment: date, amount, who paid, and the bank account it came from. Update it monthly and keep it alongside your statements. This takes minutes now and can save hours in a dispute later.
How to reduce risk before you co-own: agreements and safeguards
The situations described above are far easier to avoid than to resolve. If you are planning to co-own property, or are already co-owning without formal agreements in place, these steps reduce your exposure significantly.
Legal agreements to put in place
- Declaration of trust: Records each party's beneficial share, how unequal deposits are treated, and what happens on sale or exit. Without one, courts often default to equal shares regardless of contributions.
- Cohabitation agreement: Covers living arrangements, financial contributions, and what happens if one party wants to leave or stops paying.
- Formal exit plan: Agreed in writing before purchase, covering the process for one party buying the other out, the valuation method, and timescales.
Financial safeguards
- Use a dedicated joint account for mortgage payments, funded by standing orders from each party's personal account
- Set up split mortgage payments so contributions are automated and traceable
- Hold adequate buildings insurance in both names and review it annually
- Consider life insurance linked to the mortgage so the debt is covered if one borrower dies
A declaration of trust costs a few hundred pounds to draft. A contested TOLATA claim can cost tens of thousands. The paperwork is not bureaucracy — it is the agreement that protects everyone.
Cohaus builds several of these safeguards into its co-buying process from the start: legal protections, transparent exit terms, and shared deposit management are part of the platform's structure, not optional extras. For co-buyers who want a structured process with less uncertainty, that framework matters.
Pro Tip: Even if you have already bought without a declaration of trust, you can still create one retrospectively. A solicitor can draft it to reflect the actual contributions made so far. It is not too late.
Tax and financial implications of removing a co-owner or selling
Removing a co-owner or selling the property can trigger tax liabilities that catch people off guard.
Capital Gains Tax (CGT): If the property is not your main residence, any gain on your share may be subject to CGT. For individuals, the annual exempt amount and applicable rate depend on your total taxable income in that tax year. Transfers between spouses or civil partners in the tax year of separation may qualify for relief, but this window closes. A tax adviser or accountant should review your position before any transfer completes.
Stamp Duty Land Tax (SDLT): A transfer of equity can trigger an SDLT liability if the incoming party takes on a share of the mortgage debt. Even a gift of equity may be caught if mortgage debt is assumed. GOV.UK's SDLT guidance sets out the current thresholds and rates.
Mortgage early repayment charges: If you remortgage or sell during a fixed-rate period, your lender may apply an early repayment charge. Check your mortgage offer document for the amount and when it applies.
Negative equity: If the property is worth less than the outstanding mortgage, a sale will not clear the debt. Both borrowers remain liable for any shortfall, even after the property is sold.
How does divorce or separation affect your mortgage responsibilities?
Separation does not change your legal obligations to the lender. Both names remain on the mortgage until a formal transfer, remortgage, or court order changes that. The lender is not a party to any separation agreement, so a private arrangement between you and your ex-partner has no effect on the mortgage contract.
During divorce proceedings, the family court can make property adjustment orders that direct how the property is dealt with. These orders can require a sale, a transfer, or a deferred settlement. However, the mortgage liability only changes when the lender formally releases one party, which requires a remortgage or transfer of equity that the lender approves.
If you are married or in a civil partnership, the Matrimonial Causes Act 1973 gives the court broader powers over property than TOLATA. Unmarried co-owners rely on TOLATA alone, which is why the distinction matters. John Charcol's guidance confirms that if one co-owner stops paying and you cannot cover the shortfall, both credit files are affected regardless of any separation agreement.
Insurance considerations when a co-owner stops paying
Two insurance policies become particularly important when a co-owner stops contributing.
Buildings insurance: Most mortgage lenders require buildings insurance as a condition of the mortgage. If your co-owner was managing the policy and stops paying the premium, the cover could lapse without your knowledge. Check who holds the policy, confirm it is in both names, and take over the direct debit if necessary. A lapse in cover is a breach of your mortgage conditions.
Life insurance linked to the mortgage: Many co-buyers take out a joint life policy to cover the mortgage if one borrower dies. If your co-owner stops paying their share of the premium, the policy may lapse or revert to single-life cover. Review the policy terms and, if needed, restructure it into two separate policies so each party controls their own cover.
Income protection: If the reason your co-owner has stopped paying is that they have lost their income, check whether either of you holds an income protection policy. Some policies cover mortgage payments directly during a period of incapacity or redundancy.
The part of this that most guides understate
Most articles on this topic focus on the legal mechanics, and they are right to. But the practical reality is that the first two weeks after a co-owner stops paying are when most of the damage happens or is prevented.
People delay calling the lender because they hope the situation will resolve itself. They avoid the solicitor because it feels like escalating a conflict. They stop paying the full mortgage because it feels unfair to cover someone else's share. Each of those instincts is understandable, and each one makes the situation harder to resolve.
The order of priority is straightforward: protect the mortgage payment and your credit file first. Then pursue a negotiated exit, whether that is a buy-out, a remortgage, or a sale. Use mediation before court. Reserve TOLATA proceedings for situations where every other route has genuinely failed.
Cohaus exists partly because informal co-buying arrangements leave too much to chance. When the legal protections, exit terms, and payment structures are agreed before purchase, a co-owner stopping payments becomes a managed process rather than a crisis. That is not a theoretical benefit; it is the difference between a difficult conversation and a contested court claim.
Co-buying with built-in protections: how Cohaus approaches this
The situations described in this article are exactly what Cohaus is designed to reduce. Rather than entering a joint mortgage on informal terms and hoping for the best, Cohaus co-buyers agree legal protections, transparent exit terms, and shared deposit management before the purchase completes.
If you are currently dealing with a co-owner who has stopped paying, the immediate steps in this article apply to you now. If you are planning a future co-purchase and want a structured process that reduces the risk of payment disputes, Cohaus offers a framework built around that goal. Visit Cohaus to learn more about how co-buying with legal safeguards works in practice, or browse the co-buying guides for further reading on declarations of trust, exit planning, and shared mortgage structures.
This article is general information only and does not constitute legal advice. For guidance specific to your situation, contact a qualified solicitor.
Sources
These are the sources most useful for your next steps, whether you are speaking to a solicitor, contacting your lender, or preparing for mediation.
- What happens to a joint mortgage after separating? - MoneySavingExpert
- Financial issues for cohabiting joint owners after separation - Shelter England
- TOLATA claims guide - Setfords
This article is general information, not a substitute for advice from a qualified lawyer. Consult a qualified legal professional about your own circumstances before acting on anything here.