Helping Your Child Buy a Home: Five Routes, and Why One Often Wins

Rising prices and tighter affordability mean many first-time buyers cannot get onto the ladder on their own income, even when they can comfortably manage the monthly payments. If you want to help your child buy, there are several routes open to you. Each works differently, and each carries its own cost and its own catch.

Here is how the main options compare.

Gifting a deposit

The simplest form of help is a cash gift towards the deposit. A larger deposit means a smaller loan and often a better interest rate. It is clean and keeps you off the mortgage entirely. The limitation is that it does nothing for affordability: if your child still cannot borrow enough on their income, a bigger deposit alone will not close the gap. Gifts can also carry inheritance tax considerations depending on your circumstances.

A guarantor mortgage

With a guarantor mortgage, you agree to cover the repayments if your child cannot. It can reassure a lender, but guarantor products have become far less common, and the guarantor’s income is not usually added to boost how much can be borrowed in the same way as other routes. You take on liability without necessarily lifting the borrowing ceiling.

Becoming a joint owner

Going onto both the mortgage and the title as a joint owner solves affordability, because your income is combined with your child’s. The problem is tax. If you already own a home, buying a share of your child’s makes it an additional proper`ty, which triggers the 5% stamp duty surcharge on the whole purchase price. It also removes your child’s first-time buyer relief, because every buyer on the transaction must be a first-time buyer for the relief to apply. Between them, those two effects can add many thousands of pounds to the cost.

Related: How do joint mortgages work?

A Joint Borrower Sole Proprietor mortgage

This is the route that often wins, because it captures the benefit of joint ownership without the tax cost. Under a Joint Borrower Sole Proprietor (JBSP) mortgage, you go onto the mortgage so your income boosts affordability, but you stay off the property title. Your child is the sole legal owner of the home.

Because you are not a buyer of the property, the additional property surcharge does not apply, and your child keeps their first-time buyer relief. You take on real repayment liability, but gain no ownership, and once your child’s income can carry the mortgage alone, you can usually be removed by remortgaging into their sole name. It combines a meaningful boost to borrowing power with a clean tax position and a built-in exit.

A specialist family deposit or offset scheme

Some lenders offer schemes where you place savings with them as security instead of handing over a cash gift. Your money is held against the mortgage and returned to you later, often with interest, provided repayments are kept up. These can suit families who want to help without gifting capital outright, though availability and terms vary and the savings are tied up for a set period.

Why JBSP so often comes out ahead

For families where the child can afford the payments but cannot borrow enough alone, and where the parent already owns a home, JBSP tends to be the strongest fit. It lifts borrowing power like joint ownership, but sidesteps the surcharge and preserves first-time buyer relief, which the joint-ownership route sacrifices. The trade-off is that you take on genuine liability for a property you do not own, so it is worth taking independent legal advice before signing, and it will show on your own credit file when you next borrow.

Learn more: JBSP Mortgages Explained