For many first-time buyers, affordability is the biggest hurdle. Even with a healthy deposit, lender income assessments can block access to the right property. A joint borrower sole proprietor mortgage (JBSP) can be a solution. It allows another person (often a parent) to boost the application without being on the property deeds.
What is a JBSP mortgage?
A JBSP mortgage is a product where multiple people (often up to four) are named on the mortgage but only one—the “sole proprietor”—is listed on the property title. All borrowers share responsibility for the repayments, but only the proprietor owns the home. This structure helps first-time buyers maximise affordability while parents avoid second-home ownership and related stamp duty surcharges.
How does it work?
1) All borrowers’ incomes are considered to assess affordability.
2) The sole proprietor is the only legal owner; additional borrowers have no ownership.
3) Everyone on the mortgage is jointly and severally liable for the payments.
4) When affordability improves, the additional borrowers can usually be removed through a remortgage or product transfer (subject to lender criteria).
Example
Emma earns £25,000 and wants a £200,000 flat. Alone she might borrow ~£112,500 at 4.5× income. With her parents added as joint borrowers, the combined income rises to £70,000, lifting potential borrowing to ~£315,000—enough to buy in her own name while parents help on the mortgage but not the deeds.
Benefits of JBSP
- Boosted borrowing power by adding family income.
- First-time buyer stamp duty relief maintained for the proprietor.
- Parents avoid second-home stamp duty surcharge.
- Exit flexibility once the proprietor’s income rises.
Risks & considerations
- Joint liability: missed payments affect all borrowers’ credit files.
- Age/term limits: parents’ ages can constrain mortgage length.
- Removal requires a remortgage and fresh affordability checks.
- Family dynamics: all parties must be comfortable with the commitment.
Who can use JBSP?
First-time buyers needing affordability support, parents assisting children, and some couples where one partner does not wish to be an owner yet (for tax or legal reasons).
Alternatives
- Guarantor mortgages (family guarantees repayments without joining the loan).
- Family springboard/savings-pledge mortgages (family funds held as security).
- Joint mortgage with co-ownership (all on deeds).
- Gifted deposits (no ongoing liability).
Why Everest Mortgages?
We work with lenders that offer JBSP products, explain the legal/tax implications clearly, structure applications to maximise affordability responsibly, and plan the exit strategy to remove supporting borrowers later.
Final thoughts
JBSP can unlock the property ladder for buyers who are close but not quite there on affordability. It’s powerful, but because all borrowers carry liability, professional advice is essential.
Considering a JBSP mortgage to boost affordability without adding co-owners? Speak to Everest Mortgages for a free, no-obligation consultation at Everest-Mortgages.co.uk.
