A joint mortgage is a home loan taken out by two or more people (up to four) who share responsibility for the repayments. Joint mortgages combine incomes to increase borrowing power and are most common among couples, friends, or family members buying together.
What Is a Joint Mortgage?
A joint mortgage allows two or more people (up to four) to buy a property together. It's most common between partners, but friends, family members, or even business partners can take out joint mortgages too.
The main advantage is combined income — two incomes allow you to borrow significantly more than one person alone, making homeownership accessible at a lower individual cost. See our affordability guide for how lenders calculate borrowing power.
Joint Tenancy vs Tenants in Common
When buying jointly, you must choose between two legal ownership structures:
Joint Tenancy:
- Both parties own the whole property equally
- If one person dies, their share automatically passes to the other (right of survivorship)
- Most common for married couples
Tenants in Common:
- Each person owns a specific share (can be unequal, e.g., 60/40)
- Each share can be left to anyone in a will
- Better for unequal contributions, friends buying together, or complex financial situations
How Joint Mortgage Affordability Works
With a joint mortgage, lenders combine both applicants' incomes for affordability. If Person A earns £35,000 and Person B earns £30,000, the combined income of £65,000 at a 4.5x multiple could allow borrowing up to £292,500 — compared to £157,500 or £135,000 individually.
Both applicants' credit histories are assessed. If one person has poor credit, it can limit options for both. In some cases, it may be worth exploring whether one person applying solo with a guarantor might yield better results.
Joint Borrower Sole Proprietor (JBSP) Mortgages
A newer option gaining popularity is the JBSP mortgage. This allows a parent (or other family member) to be on the mortgage for affordability purposes, but not on the property's title deed. This means:
- The child benefits from the parent's income for borrowing more
- The parent doesn't own the property, so avoids the 3% stamp duty surcharge
- The child is still classed as a first-time buyer for stamp duty relief
Protecting Your Joint Mortgage
With a joint mortgage, it's especially important to have the right protection in place. If one person dies or becomes seriously ill, the surviving partner still needs to cover the full mortgage payment.
- Life insurance — two single policies often provide better protection than one joint policy
- Critical illness cover — pays a lump sum if diagnosed with a serious illness
- Income protection — replaces your salary if you can't work
Frequently Asked Questions
- Can more than two people be on a mortgage?
- Yes, up to 4 people can be named on a mortgage. However, most lenders will only use the 2 highest incomes for affordability calculations.
- What happens to a joint mortgage if we separate?
- Options include: one person buying the other out, selling the property and splitting proceeds, or (less commonly) continuing to co-own. A solicitor can advise on the best approach.
- What is a JBSP mortgage?
- A Joint Borrower Sole Proprietor mortgage allows a parent or family member to be on the mortgage for affordability, but not on the title deed. The child benefits from higher borrowing without the parent owning the property or paying the 3% stamp duty surcharge.
- Do both applicants need good credit for a joint mortgage?
- Both applicants' credit histories are assessed. If one person has poor credit, it can limit options for both. In some cases, it may be worth one person applying solo with a guarantor instead.
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