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 guidance 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.

Borrowing Calculator

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This is an estimate only. Lenders use their own affordability models, income treatment, credit checks, property checks and stress tests.

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Frequently asked questions

Can JBSP avoid the additional-property Stamp Duty surcharge? +

It may help where the supporting borrower is not on the deeds, but SDLT depends on the full transaction details. If the buyer is a first-time buyer, first-time buyer relief may still apply.

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 guidance for the helping party is essential.

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