More income on the application, one name on the deeds.
A Joint Borrower Sole Proprietor (JBSP) mortgage lets up to four people's incomes support the loan while only one person owns the property. It's how a parent can boost a child's borrowing without going on the title — a cleaner, often more tax-efficient alternative to a guarantor mortgage. As a whole-of-market, FCA-authorised brokerage, we place JBSP cases, including where the buyer's income is contractor or day-rate.
- Assessed onHousehold incomeSalary and other qualifying income
- Income multiple~4.5×Some lenders stretch higher
- Deposit from5%Low-deposit schemes available
- AdviceWhole-of-marketDirectly FCA authorised
How JBSP works
All borrowers are jointly liable for the mortgage, so their combined income raises affordability — but only the proprietor is named on the deeds and legally owns the home. The supporting borrower (often a parent) has no ownership share, which can avoid an additional-property stamp duty charge for them.
JBSP vs guarantor mortgage
A guarantor only steps in if you default; a JBSP borrower is on the mortgage from day one, so their income counts fully towards affordability. That usually means more borrowing than a guarantor arrangement. Compare with first-time buyer routes.
Who it suits
First-time buyers whose own income falls short, professionals early in a career, and contractors whose day rate is strong but whose accounts are short. Family affordability is assessed alongside yours — see IT contractors.
Things to weigh up
Supporting borrowers take on real liability and it may affect their own borrowing; and it usually counts as an additional mortgage for them. Independent legal advice is normally required. We explain the trade-offs clearly.
Talk it through
Speak to an adviser to see how much a JBSP arrangement could add to your borrowing.
Lenders offering JBSP — a selection
Lender guides: Halifax · Barclays · HSBC · NatWest · Nationwide · Accord · Clydesdale · Yorkshire BS · Kensington See how we place cases →
Joint Borrower Sole Proprietor (JBSP) Mortgages, answered
What is a JBSP mortgage?+
A Joint Borrower Sole Proprietor mortgage lets several people's incomes support the loan while only one person owns the property and is named on the deeds.
How is JBSP different from a guarantor mortgage?+
A JBSP borrower is on the mortgage from the outset, so their income counts fully towards affordability; a guarantor only becomes liable if you fall behind.
Does the supporting borrower pay extra stamp duty?+
Because they don't own the property, they can usually avoid an additional-property stamp duty charge — but their own borrowing may be affected. Take advice.
Can I use JBSP as a contractor?+
Yes. Your day-rate income is assessed the specialist way and combined with the supporting borrower's income.
How many people can be on a JBSP mortgage?+
Typically up to four borrowers, though only one is the legal owner. Lender rules vary.