13/05/2026
A Guarantor / Joint Borrower Sole Proprietor (JBSP) mortgage allows you to add up to three additional people to a mortgage without making them legal owners of the property. The lender factors in all incomes during the application, meaning your client can borrow more than if they were taking out a mortgage on their own. This structure is often used by parents or other family members helping first-time buyers onto the property ladder.
No Difference to First-Time Buyer Stamp Duty Relief
Your supporting borrowers won’t be listed on your home’s deeds, so any eligible first-time buyer stamp duty relief won’t be affected. Neither will your mortgage’s tax position.
Retired Parents with Reduced Income Can Still Help
This structure is often used by parents or other family members helping first-time buyers onto the property ladder. We often use this structure for clients of wealth managers who have retired or have reduced income. We can use SIPP, ISA, or other UK portfolios instead of income. No charge is taken on the investments. This structure can be used up to age 80 for the guarantor.
Commonly Used for Divorcing Clients
This can also be used for divorcing clients if one party wishes to remain in the marital home and the other wishes to buy another property. By the higher earner acting as guarantor and not being named on the deeds, they are free to purchase another property without incurring the additional 5% stamp duty surcharge.
If you would like to discuss anything mentioned in this post, please contact Steve Padgham by calling him on 020 8614 4782.
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