Joint Borrower Sole Proprietor (JBSP) ILA
Independent Legal Advice for JBSP mortgages — accepted by all major UK lenders, same-day video appointments
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Same-Day Video Appointments
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Lender-Accepted Certificate
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SRA Regulated
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Fixed Fee from £150 + VAT
✔ Online
Poppy LLB
Solicitor
✔ Online
Zain
Solicitor
✔ Online
Mohsin
Solicitor
How Can We Help You?
Please supply us with:
- Your JBSP form, Deed of Acknowledgement or equivalent lender document
- The mortgage offer or facility letter
- The names of all borrowers and all legal owners
- Contact details of the conveyancing solicitor
- Your preferred appointment time
A Joint Borrower Sole Proprietor (JBSP) mortgage is an arrangement where one or more people are jointly liable for the mortgage repayments but only one (or some) of them appear on the property's title deeds as legal owner. The most common situation is a parent or grandparent supporting an adult child onto the property ladder: the parent's income is added to the child's for affordability purposes, but only the child becomes a legal owner of the property.
This arrangement carries a particular legal risk for the supporting borrower: you take on full liability for the mortgage repayments while having no direct ownership of the property, no automatic right to its sale proceeds, and limited control over what happens to it. Because of these risks — and following the House of Lords decision in Royal Bank of Scotland v Etridge (No 2) [2001] — UK lenders require non-owner borrowers to obtain Independent Legal Advice before completion. We provide this service quickly, clearly and at a fixed fee.
JBSP, Springboard and Income Booster — What's the Difference?
Different lenders use different names for what are essentially similar arrangements. Whatever it's called, the legal substance is the same: you are taking on mortgage liability without becoming a legal owner of the property.
When You'll See JBSP Arrangements
- Parent helping a first-time-buyer child — the most common scenario
- Grandparent supporting a grandchild — increasingly common as house prices outpace incomes
- Family Springboard mortgages — Barclays and similar products combining JBSP with a family deposit
- Income Booster / Deposit Booster mortgages — different names for similar concepts
- Sibling supporting a sibling — particularly where one earns substantially more
- Divorce or separation settlements — where one party comes off the title but continues to fund the mortgage
- Property gifted but financed jointly — common with inheritance situations
What We Cover in Your ILA Appointment
1. Your Position as a Non-Owner Borrower
We will explain your specific legal position: full personal liability for the mortgage payments (including if the legal owner stops paying), no automatic right to occupy the property, no automatic right to any sale proceeds, and limited control over what the legal owner does with the property. This is critical to understand before you sign.
2. The Lender's Document — JBSP Form or Deed of Acknowledgement
We will walk through the specific document the lender has asked you to sign. Different lenders use different terms — JBSP Form, Deed of Acknowledgement, Non-Owner Borrower Declaration, Form of Acknowledgement — but the legal effect is similar. We are familiar with each major lender's documentation.
3. Impact on Your Own Borrowing Capacity
Once you've signed a JBSP mortgage, it counts as a financial commitment on your credit record. This will affect your own ability to borrow — for example if you later want to remortgage your own home, take out a buy-to-let mortgage, or borrow for any other purpose. We will explain this practical consequence clearly.
4. Stamp Duty and Other Tax Considerations
Because you are a borrower but not a legal owner, the property purchase is treated for SDLT purposes by reference to the legal owner only. This avoids the additional 3% surcharge that would apply if you were on the title and owned other property. We will outline the basic position and refer you for specialist tax advice where needed.
5. What Happens If the Owner Stops Paying
If the legal owner stops making mortgage payments, the lender will turn to you for the full amount — not just your 'share'. You will be liable for the entire monthly payment. Eventually this could affect your credit record, force you into making payments to protect the property, or trigger possession proceedings. We will walk through these scenarios.
6. Protecting Your Position with a Declaration of Trust
If you are concerned about your financial exposure, you may wish to consider a separate Declaration of Trust between you and the legal owner, recording any agreement about repayment, beneficial interest, or what happens on a sale. This is a separate document from the JBSP mortgage and not always necessary — we will discuss whether it is appropriate in your case.
7. Exit Strategy
Most JBSP arrangements are designed to be temporary — the supporting borrower comes off the mortgage once the primary borrower's income grows enough to refinance solo. We will discuss how this exit typically happens, what triggers it, and any potential blockers to look out for.
8. Undue Influence and Family Dynamics
Where the JBSP arrangement is between family members, the ILA process specifically checks for undue influence — pressure or persuasion to sign that goes beyond a normal family discussion. We will speak with you alone, in confidence, and confirm the decision to support the borrowing is genuinely yours.
Frequently Asked Questions
What exactly is a Joint Borrower Sole Proprietor mortgage?
It's a mortgage where two or more people are jointly liable for the repayments, but only one of them (or fewer than all of them) appears on the property's title deeds as a legal owner. The supporting borrower's income helps with affordability assessment, but they don't actually own the property.
Do I become a legal owner of the property by signing a JBSP mortgage?
No. Under a JBSP arrangement, only the named legal owner (the 'proprietor') is on the title deeds. You take on mortgage liability without acquiring any direct ownership of the property. If you want to be a legal owner — even a partial one — you need a different structure, such as joint tenancy or tenancy in common.
Will a JBSP mortgage trigger the 3% additional SDLT surcharge?
Generally not — because SDLT is assessed by reference to the legal owners only. If the named legal owner of the JBSP property does not own another residential property, the standard SDLT rates apply (not the 3% surcharge). This is one of the practical advantages of JBSP over straightforward joint ownership. Tax treatment can be complex though, and we recommend speaking with a specialist tax adviser if you are concerned.
If my child stops paying the mortgage, am I really liable for the whole amount?
Yes. JBSP mortgages create joint and several liability — the lender can pursue any one borrower for the full amount owed, not just their 'share'. If your child stops paying, the lender will turn to you for the full monthly payment, not 50%. This is why a clear understanding of the arrangement (and a contingency plan) matters so much.
How will a JBSP mortgage affect my own credit and borrowing?
It will count as a financial commitment on your credit profile. Future lenders assessing your borrowing capacity will see you have an existing mortgage liability — even though you don't own the property. This typically reduces what you can borrow for your own purposes (a remortgage, a second home, buy-to-let etc.).
Can I be removed from the JBSP mortgage later?
Yes, when the primary borrower's income grows enough to refinance the mortgage solo, you can be removed. This requires the legal owner to apply to remortgage in their sole name, and the new lender's affordability assessment must support the loan on the owner's income alone. We can explain the process during your ILA appointment.
Which UK lenders offer JBSP mortgages?
Many do, with varying product names. Barclays Family Springboard is the most well-known; others include Hinckley & Rugby, Tipton & Coseley, Family Building Society, Hanley Economic, Marsden, Buckinghamshire, Furness, Skipton, Newcastle, Leeds, Vernon, Mansfield, Bath, Cumberland and others. Each lender has slightly different criteria — your broker will identify the best fit.
Is a Declaration of Trust required for a JBSP arrangement?
Not by the lender — the JBSP mortgage itself is sufficient for them. But many families choose to enter into a Declaration of Trust separately, between the supporting borrower and the legal owner, recording any agreement about contribution, repayment, future ownership or what happens on a sale. We can advise on whether this is appropriate in your specific case.
What happens to the JBSP mortgage if I die before my child can refinance?
Your liability under the mortgage forms part of your estate. Practical options vary: life insurance can cover the liability; your estate can settle the debt; or the property may need to be sold. We strongly recommend reviewing your life cover and Will before entering into a JBSP arrangement — and we can refer you to a financial adviser if helpful.
What's the age limit for a parent acting as a JBSP supporting borrower?
It depends on the lender. Many lenders require the supporting borrower's age plus the mortgage term to fall within a maximum (commonly 75–85 years). Some specialist lenders accept supporting borrowers in their 70s with the mortgage term running into their 80s. Your broker will identify which lenders work for your specific situation.
Can I act as a JBSP supporting borrower if I already own property?
Yes — owning your own property doesn't prevent you from supporting a JBSP arrangement. In fact, it's usually a positive factor for the lender. But it does mean your overall mortgage commitments will be higher, which the lender will factor into their affordability assessment.
Is JBSP the same as a guarantor mortgage?
Similar in effect, but legally distinct. A guarantor mortgage makes you liable only if the primary borrower defaults — secondary liability. A JBSP mortgage makes you a primary borrower from day one, jointly and severally liable for every payment regardless of what the legal owner does. JBSP is the more common modern arrangement; pure guarantor mortgages have largely fallen out of fashion.
Areas we do not currently assist with
Please note that Lawyers Online is not currently able to provide Independent Legal Advice on the following matters:
- Equity Release & Lifetime Mortgages — including all Equity Release Council products
- Transfer of Equity — including transfers between spouses on marriage or divorce, and other change-of-ownership transactions
If your matter falls into one of these categories, we recommend contacting an SRA-regulated solicitor who specialises in that area, or your local Citizens Advice for a referral.
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Lenders & Companies We Work With
