A JBSP mortgage lets a family member be named on the mortgage to boost your borrowing without appearing on the property title. No stamp duty surcharge. The buyer remains the sole legal owner. Woodhall Mortgages is a whole-of-market broker providing regulated JBSP mortgage advice across the UK.
Initial discussion free. A broker fee of £299 is payable if you choose to proceed following a formal mortgage offer.
Get JBSP Mortgage AdviceA JBSP mortgage allows a family member to be included on the mortgage for affordability purposes without owning the property. Their income boosts your borrowing. Your name alone appears on the title deeds.
A Joint Borrower Sole Proprietor mortgage is a mortgage where two or more people are named on the mortgage agreement but only one person is named on the property title deeds. The additional borrower, typically a parent or family member, is included because their income allows the lender to offer a larger loan than the buyer could obtain alone.
The sole proprietor is the legal owner of the property. The joint borrower has no legal ownership rights but is equally responsible for ensuring the mortgage is repaid. Because the joint borrower does not appear on the title deeds, they are not treated as a property owner for stamp duty purposes, which avoids the higher rate surcharge that would apply to someone purchasing a second or subsequent property.
JBSP mortgages are most commonly used when first time buyers cannot borrow enough on their income alone to buy the property they need. They are particularly common in London, the South East and other areas where property prices significantly exceed what a single income can support at standard income multiples. They are also used by buyers returning to the market after a relationship breakdown and by older borrowers whose limited mortgage term restricts their borrowing capacity.
Both JBSP and guarantor mortgages involve a family member supporting a purchase. They work differently and suit different situations. Understanding the distinction is important before applying.
| Feature | JBSP Mortgage | Guarantor Mortgage |
|---|---|---|
| Named on mortgage? | Yes: income included | No |
| Named on title deeds? | No | No |
| Increases borrowing? | Yes: income boosting | No: security only |
| Family property at risk? | No | Potentially yes |
| Stamp duty surcharge? | No surcharge | No surcharge |
| Affects family member credit? | Yes | Yes |
| Exit mechanism | Remortgage when income allows | Release when LTV falls to 80% |
Adding a joint borrower can dramatically increase what you can buy. A parent on £45,000 alongside a buyer on £35,000 could unlock over £225,000 in extra buying power.
This example uses a 4.5x income multiple and is illustrative only. Actual borrowing depends on both applicants' full financial circumstances, credit histories, outgoings and individual lender criteria. Some lenders offer higher income multiples for JBSP applications.
One of the most important reasons buyers choose JBSP over a standard joint mortgage is the stamp duty treatment. Because the joint borrower is not on the title deeds, they are not treated as a buyer.
In a standard joint mortgage, all parties are typically named on the title deeds. If any party already owns a property, the higher rate surcharge applies to the entire purchase. In a JBSP mortgage, the joint borrower is not on the title deeds and is not considered a purchaser. The surcharge does not apply, even if the joint borrower already owns their own home.
This distinction makes JBSP particularly valuable when a parent who owns their own home wants to help their child buy. A standard joint mortgage would trigger the additional stamp duty rate on the full purchase price. A JBSP mortgage avoids this entirely.
The sole proprietor pays stamp duty based on their own status. A first time buyer purchasing their first home pays standard first time buyer stamp duty rates with the available relief. Stamp duty rules and thresholds change periodically. A broker or solicitor can confirm the current position before you exchange contracts.
A whole-of-market broker compares JBSP products from across the market, identifies which lenders will include the joint borrower's income and confirms the maximum borrowing available for your specific circumstances.
Initial discussion free. A broker fee of £299 is payable if you choose to proceed following a formal mortgage offer. This fee is non-refundable once charged.
Get JBSP Mortgage AdviceFrom application to removing the joint borrower, here is how a JBSP mortgage works at each stage.
Both the sole proprietor and the joint borrower apply together. The lender assesses both incomes combined against their affordability criteria. The joint borrower's existing mortgage, outgoings and credit history are all included in the assessment.
On completion, the property is registered at the Land Registry in the sole proprietor's name only. The joint borrower has no legal ownership of the property. This is confirmed in the mortgage documentation and the conveyancing.
Both the sole proprietor and the joint borrower are equally responsible for ensuring the mortgage is repaid. The mortgage appears on both credit files. If repayments are missed, both parties' credit profiles are affected.
Most lenders require the joint borrower to take independent legal advice from a solicitor who is not acting for the buyer. This confirms they understand the extent of their financial commitment before they sign.
When the sole proprietor's income has grown sufficiently to service the full mortgage alone, a remortgage application is made in the sole proprietor's name only. The joint borrower is removed and is no longer financially connected to the property.
JBSP mortgages are available from a number of high street and specialist lenders but not all lenders offer this product. Lender criteria, maximum ages for the joint borrower, income multiples and affordability requirements vary significantly between lenders. A whole-of-market broker identifies which lenders will consider your specific combination of incomes and circumstances before any application is submitted.
Lender criteria for the joint borrower vary but typically require a close family member who can pass affordability and credit checks alongside their own financial commitments.
Most lenders require the joint borrower to be a close family member, typically a parent, stepparent or grandparent. Siblings and other family members are accepted by some lenders. The joint borrower must:
The joint borrower's income is assessed using the same criteria as any other mortgage applicant. PAYE income is the simplest to assess. Self-employed income from the joint borrower may be assessed differently by different lenders. A broker can identify which lenders accept the joint borrower's specific income type and employment status.
JBSP mortgages are also used when the sole proprietor is approaching or past the standard working age and their mortgage term is therefore limited, restricting the amount they can borrow. Adding a younger joint borrower can extend the effective term available to the lender's affordability model, increasing the amount that can be borrowed. A broker can confirm whether this structure is available for your circumstances.
JBSP mortgages are available from a number of high street and specialist lenders but not all lenders offer this product. Criteria, income multiples and maximum borrower ages vary significantly.
The lender landscape for JBSP mortgages includes high street banks, building societies and specialist lenders. Key differences between lenders include the maximum age of the joint borrower at the end of the mortgage term (typically 70 to 80), the income multiples applied to the combined income, and how they assess different income types for the joint borrower.
Some lenders applying standard 4.5x income multiples to a JBSP application will allow a higher multiple for applicants in certain professions or with higher combined incomes. The range of available products changes as lenders enter and exit the JBSP market.
As a whole-of-market broker, we compare current JBSP products from available lenders, identify which lenders will accept both applicants' income types and age profiles, and submit to the right lender first time. We do not limit our search to a preferred panel of lenders.
A lender that accepts a PAYE parent as joint borrower may not accept a self-employed parent using the same income multiple. A lender that accepts a parent aged 62 may not accept one aged 68. Identifying the right lender for your specific combination of applicants before submitting saves time and protects both credit files from unnecessary hard searches.
We compare JBSP mortgages from across the market, assess whether the joint borrower's income can be included and identify the maximum borrowing available for your circumstances, subject to individual lender criteria.
A broker fee of £299 is payable if you choose to proceed following a formal mortgage offer. This fee is non-refundable once charged. We may also receive commission from the lender. Your home may be repossessed if you do not keep up repayments on your mortgage.
Get JBSP Mortgage AdviceWoodhall Mortgages is authorised and regulated by the Financial Conduct Authority. Firm reference number 762513. Woodhall Mortgages is a whole-of-market mortgage broker. We consider a comprehensive range of mortgages from across the market, but not all lenders or products may be included.
A broker fee of £299 is payable if you choose to proceed following a formal mortgage offer. This fee is non-refundable once charged. We may also receive commission from the lender. Your home may be repossessed if you do not keep up repayments on your mortgage.
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