How a joint mortgage works
A joint mortgage is a single home loan in the names of two or more borrowers. The lender adds your incomes together when working out how much you can borrow, which is why couples and co-buyers can usually access a larger loan than either person could alone. Most lenders allow up to four people on the mortgage, but many only count the two highest incomes for affordability.
The crucial legal point is 'joint and several liability'. Each borrower is responsible not just for their share but for the entire debt. If one person stops paying, the lender can pursue any of the others for the full monthly payment, and a missed payment damages everyone's credit file, not just the person who fell behind.
Being named on a joint mortgage also creates a 'financial association' on your credit record. Lenders assessing your future applications can see the linked person, so their credit problems can indirectly affect your borrowing even after the link is no longer relevant.
Joint tenants vs tenants in common
How you hold the property legally is separate from the mortgage and matters most when someone dies or wants out.
| Joint tenants | Tenants in common | |
|---|---|---|
| Ownership shares | Always equal | Can be unequal (e.g. 70/30) |
| If one owner dies | Passes automatically to co-owner(s) | Passes via their will or intestacy |
| Best for | Married couples / civil partners | Friends, family, unequal deposits |
| Can sell or gift a share alone | No | Yes (subject to terms) |
| Declaration of trust useful? | Rarely needed | Strongly recommended |
You can switch between the two later by 'severing' or re-creating the joint tenancy.
Applying for a joint mortgage
Check combined affordability
Get a mortgage in principle using both incomes so you know your realistic budget before viewing.
Agree the deposit split
Decide who contributes what and whether unequal shares need recording in a deed of trust.
Choose your ownership type
Tell your conveyancer whether you want to hold as joint tenants or tenants in common.
Pass joint affordability and credit checks
Both applicants' debts, outgoings and credit histories are assessed together.
Complete and register
On completion the Land Registry records all named owners and any restriction protecting unequal shares.
You're liable for the whole loan
On a joint mortgage everyone is responsible for the full repayments, not just their share. Missed payments by one person affect everyone's credit and the lender can pursue any party for the full amount, even after a relationship ends.
Protect yourself when buying together
- Hold as tenants in common if deposits or contributions are unequal.
- Get a declaration (deed) of trust drawn up recording each share and what happens on sale.
- Agree in advance what happens if one person wants to sell, move out or buy the other out.
- Consider life or income protection insurance so a death or illness doesn't leave one party stranded.
- Remember you're financially linked, it can affect each other's future borrowing.
Coming off a joint mortgage
If you separate or want to remove someone, you'll need a 'transfer of equity', a legal process where one party is taken off the mortgage and title. The remaining borrower(s) must prove they can afford the loan alone, which often means re-applying to the lender or remortgaging.
If affordability doesn't stack up on a single income, the lender can refuse to release the departing party, leaving them liable even though they've moved out. This is one of the most common joint-mortgage pitfalls, so plan an exit route before you commit.