Helping your child onto the property ladder can backfire at the Land Registry. Put a parent on the title alongside their child, and HMRC treats the parent as buying a second home, adding a 5% stamp duty surcharge and cancelling any first-time buyer relief the child would otherwise get.
A Joint Borrower Sole Proprietor mortgage sidesteps both problems: the parent’s income counts towards affordability, but only the child goes on the title. No surcharge, relief intact.
A parent helping with a £270,000 flat could save their child £13,500 in stamp duty this way.
When parents help a child buy a home, a well-meant decision can quietly add thousands of pounds to the bill. The culprit is the additional property stamp duty surcharge, and it catches more families than you might expect.
Understanding how it works, and how a Joint Borrower Sole Proprietor mortgage avoids it, can make a real difference to the cost of getting a child onto the ladder.
The surcharge, and who it catches
In England and Northern Ireland, buying an additional residential property attracts a surcharge on top of the standard rates of stamp duty. It currently stands at 5% of the whole purchase price, and it applies whenever, at the end of the day of the purchase, you own more than one residential property and the new one is not simply replacing your main home.
The trap for families is this: if a parent who already owns their own home goes onto the title of their child’s purchase, the parent is treated as buying an additional property. The surcharge then lands on the entire price of the child’s home. On a £300,000 purchase, that is an extra £15,000, on top of any standard duty due.
Related: Stamp Duty Land Tax Explained
First-time buyer relief falls away too
There is a second cost. First-time buyer stamp duty relief only applies where every buyer on the transaction is a first-time buyer. A parent who has owned before does not qualify, so adding them as an owner removes the relief from the whole purchase. A child who would have paid little or no stamp duty as a sole first-time buyer can suddenly face a full bill plus the surcharge, purely because a parent joined them on the title to help with affordability.
Related: First Time Buyer Mortgage Guide
The key distinction: mortgage versus title
This is where a Joint Borrower Sole Proprietor (JBSP) mortgage changes the picture.
HMRC’s higher-rate test looks at property ownership, not at who is named on the mortgage. Those are two separate things, and a JBSP deliberately keeps them apart.
Under a JBSP scenario, the parent goes onto the mortgage, so their income counts towards affordability, but stays off the property title. The child alone is registered as the legal owner. Because the parent is not a buyer of the property, they are not acquiring an additional dwelling, so:
- the 5% additional property surcharge does not apply
- a genuine first-time buyer child keeps their first-time buyer relief in full
The family gets the affordability boost that comes from combining incomes, but the purchase is taxed as what it really is: a first-time buyer buying their own home.
Read more: JBSP Mortgages
What it can save
Take a first-time buyer purchasing a £270,000 flat with a parent’s support. Adding the parent to the title would bring a 5% surcharge of £13,500, and strip out first-time buyer relief on top. Structured as a JBSP, with the parent on the mortgage but not the title, the surcharge disappears and the relief is preserved. The saving on the surcharge alone is £13,500, and it scales with the price of the property.
Case Study: FTB Purchase with a Parents Income
Get the structure right from the start
The tax outcome is decided by how the purchase is structured, so it pays to get advice before you commit rather than after. A JBSP is not right for every family, it carries real liability for the supporting parent and its own criteria, but where the aim is to lift borrowing power without inflating the tax cost, it is often the most efficient route.
As a whole-of-market broker, Drake Mortgages assesses your position and identifies the structure and lender that fit your circumstances.
To find out whether a JBSP could work for your family, call us on 020 8301 7930
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