How Much Mortgage Deposit Do You Really Need in the UK?

The deposit is the single biggest barrier to buying a home in the UK. This guide explains how much you really need, where to get it, and how to maximise the government help available.

How Much Deposit Do You Need?

The minimum deposit for a UK mortgage is 5% of the purchase price. But the minimum isn't the optimum — the bigger your deposit, the better your mortgage rate. Here's how LTV bands affect rates in 2026:

• 95% LTV (5% deposit): Highest rates, fewest lenders, strictest criteria.
• 90% LTV (10% deposit): Slightly better rates, more lenders available.
• 85% LTV (15% deposit): Competitive rates, most first-time buyers aim here.
• 80% LTV (20% deposit): Good rates, more flexibility.
• 75% LTV (25% deposit): Excellent rates.
• 60% LTV (40% deposit): Best rates available.

On a £250,000 property, the difference between a 95% LTV mortgage (5.8% rate) and an 85% LTV mortgage (5.0% rate) is about £100/month — £30,000 over a 25-year term. A bigger deposit doesn't just reduce the loan; it reduces the rate on the loan you do take.

The Lifetime ISA: Free Government Money

If you're 18-39 and saving for your first home, a Lifetime ISA (LISA) is the best savings vehicle available. You can contribute up to £4,000 per year (which counts towards your £20,000 ISA limit), and the government adds a 25% bonus — so £4,000 becomes £5,000. That's free money.

Over 5 years of maxing out a LISA, you'd contribute £20,000 and receive £5,000 in government bonuses. If the LISA is invested in a Stocks & Shares LISA earning 5% per year, the total after 5 years would be about £29,000 — £4,000 in growth on top of the contributions and bonus. The LISA can be used for a first home up to £450,000.

How Long Will It Take to Save?

Saving £37,500 (15% of £250,000) on a take-home salary of £2,500/month, saving £500/month, takes about 6 years and 3 months. Saving £750/month takes about 4 years and 2 months. Saving £1,000/month takes about 3 years and 2 months. The faster you save, the sooner you buy — and the less time house prices have to rise ahead of you. Use our Budget Calculator to find how much you can afford to save each month.

Where Deposits Come From

Savings are the classic route, but they're far from the only one. A large share of UK first-time buyers receive family help — a gifted deposit. Lenders accept gifted deposits, but they will ask for a gifted deposit letter signed by the giver, confirming the money is a genuine gift with no repayment expected and no stake in the property. That letter matters: if the “gift” is really a loan, it changes your affordability assessment and can void the mortgage offer if discovered later. Inheritance, bonuses, and proceeds from selling a previous property are also accepted sources with a clear paper trail.

What lenders won't accept is a deposit funded by new borrowing. Taking a personal loan or maxing credit cards to fund a deposit fails affordability checks — the lender sees the new debt payments and recalculates what you can afford, and the mortgage typically gets declined. If you're short of the deposit you want, the honest answers are to save longer, buy cheaper, or use a LISA to let the government bonus close some of the gap.

Deposit vs Stamp Duty: Don't Confuse the Two

Many first-time buyers budget for the deposit and forget Stamp Duty Land Tax (SDLT) — a separate cost, paid on completion, on top of the deposit. For 2026/27 in England and Northern Ireland, first-time buyer relief means you pay 0% SDLT on the first £300,000 of a property and 5% on the portion from £300,001 to £500,000 — so on a £250,000 home, a first-time buyer pays nothing. But the relief has a cliff edge: at £500,001 you lose it entirely and pay standard rates (0% on the first £250,000, then 5%, as a standard buyer would). A property just over the threshold can cost several thousand pounds more in SDLT than one just under it — worth knowing before you make an offer. Scotland and Wales run their own systems (LBTT and LTT) with different bands.

The Other Costs on Top of the Deposit

The deposit is the biggest number, but not the only one. Between having an offer accepted and getting the keys, a realistic budget for conveyancing and legal fees, a survey, valuation, mortgage arrangement fees, and removals is roughly £2,500 to £5,000 depending on the property and the lender's fee structure. Two practical rules: don't drain your savings to zero to hit a rounder deposit figure — a 9% deposit with £3,000 left over is usually healthier than a 10% deposit with nothing; and check whether arrangement fees can be added to the loan, remembering that adding fees increases the balance and the interest you pay on it.