Joint Borrower Sole Proprietor (JBSP) Mortgages
A JBSP mortgage lets up to 4 people's incomes count toward affordability while only one person — usually the buyer — is on the property deeds. It's a popular route for parents helping adult children buy without becoming legal owners.
Your home may be repossessed if you do not keep up repayments on your mortgage.
Quick summary
- Up to 4 borrowers — typically the buyer plus 1–3 family members.
- Only the buyer is on the deeds, so there's no SDLT issue around the helping party owning two properties.
- All borrowers are jointly liable for the full mortgage debt.
- The non-owning party is usually expected to come off the mortgage within 5–10 years (often via remortgage in the buyer's sole name).
- Lender pool is narrower than standard residential — a handful of specialists like Skipton, Furness, Tipton & Coseley, Beverley BS.
What lenders may look at
- Combined affordability across all parties
- Age of older borrowers (often capped at 75–80 at end of term)
- Buyer's own credit profile and income
- Helping party's pension/retirement plan
- Exit strategy — how the non-owner comes off
Documents you may need
- Standard pack for all borrowers (ID, payslips/accounts, bank statements)
- Independent legal advice declaration for the non-owning party (some lenders)
- Solicitor's confirmation of the deed structure
Common issues
- Older helping party — age cap can force a shorter term.
- Helping party has their own mortgage — affordability stress test counts that commitment.
- Exit plan unclear — lenders may decline without a credible 5-year plan.
Frequently asked questions
Does JBSP avoid the 3% Stamp Duty surcharge? +
Yes — because the helping party isn't on the deeds, the buyer is treated as a single owner. If the buyer is a first-time buyer, FTB relief still applies.
Can my parents come off the mortgage later? +
Yes — usually via a remortgage in the buyer's sole name once their income has grown enough to qualify alone. Most lenders expect this within 5–10 years.
Are JBSP mortgage rates higher? +
Slightly — JBSP is a niche product. Expect a small premium over standard residential rates.
Which UK lenders offer JBSP? +
Skipton, Furness, Tipton & Coseley, Beverley BS, Buckinghamshire BS, Marsden BS and a few others. A specialist broker is the fastest route in.
Is the helping party liable if the buyer defaults? +
Yes — all named borrowers are jointly and severally liable. Independent legal advice for the helping party is essential.
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