First-Time Buyer Guide to Mortgage Deposits

Why Your Deposit Matters More Than You Think

When you buy your first home, the deposit is the part of the purchase price you pay yourself. The rest comes from your mortgage. That single figure shapes almost everything else about your deal: the size of your loan, the interest rate you are offered, and how much you hand over each month for years to come.

Lenders talk about loan-to-value, or LTV. If you put down 10 per cent on a £250,000 home, you borrow £225,000 — a 90 per cent LTV mortgage. Stretch to a 95 per cent deal and you are borrowing £237,500 instead. The difference in monthly repayments can look modest at first, but over a 25 or 30 year term it adds up to thousands of pounds.

The reason is straightforward: the bigger your deposit, the less risk the lender is carrying, and the better the rate they will offer you. Crossing certain thresholds — 90, 85, 80, 75 and 60 per cent LTV — can unlock noticeably cheaper deals.

How Much Do You Actually Need?

Most UK lenders expect a minimum of 5 per cent, which is why 95 per cent mortgages still exist, though the choice is narrower and the rates higher. Here is what different deposits typically mean in practice:

• 5 per cent — the entry point. On a £250,000 home that is £12,500. Expect the highest rates and the strictest affordability checks.
• 10 per cent — a common sweet spot, with far more deals to choose from. £25,000 on a £250,000 property.
• 15 per cent — better rates again, though the improvement from 10 to 15 is usually smaller than the jump from 5 to 10.
• 20 per cent or more — where the keenest rates tend to sit. £50,000 on a £250,000 home, and often a more generous affordability assessment too.

There is no single "right" number. The honest answer is that your deposit should be as large as you can manage without emptying your savings entirely — you will need money left over for fees, furniture and the inevitable surprises.

Help With Building Your Deposit

You do not have to do this alone, and there are legitimate schemes designed to lend a hand.

• Lifetime ISA. If you are aged 18 to 39, you can open one and save up to £4,000 a year. The government adds a 25 per cent bonus — up to £1,000 annually — and you can use the pot towards a first home worth up to £450,000. Withdraw the money for anything else and you lose the bonus plus a little of your own cash.
• Shared ownership. You buy a share of a property, often between 25 and 75 per cent, and pay rent on the rest. Your deposit applies only to the share you buy, which can make the numbers far more manageable.
• Gifted deposits. Many lenders accept money from family. They will usually want a signed letter confirming it is a gift rather than a loan, so have that conversation early.
• Guarantor mortgages. A family member pledges their own savings or property as security, which can help if your deposit is modest but your income is solid.

Practical Ways to Grow Your Savings Faster

A deposit rarely appears overnight. It is built through a series of steady, unglamorous, effective habits.

• Treat saving like a bill. Set up a standing order that leaves your account the day after payday, before you have a chance to spend it.
• Use a dedicated account. Keep deposit money separate from everyday cash. A notice account or regular saver often pays a better rate, provided you can still access the funds when you need them.
• Target the big three. Housing, transport and food take the largest share of most budgets. Renegotiating a contract or cycling to work frees up far more than cancelling a streaming subscription.
• Know your protection. Money held with a bank or building society is protected up to £85,000 per person, per institution, so spreading large sums is worth considering.
• Add every windfall. Tax refunds, bonuses and birthday money all count. Send them straight to the deposit pot rather than your current account.

Don't Forget the Costs Beyond the Deposit

Your deposit is the headline figure, but it is not the only one. Budget for legal fees, a survey, a valuation, mortgage arrangement fees and removals. If you are buying in England or Northern Ireland, stamp duty may apply — first-time buyers currently pay nothing on the first £300,000, with 5 per cent on the portion up to £500,000. Scotland and Wales have their own equivalents with different thresholds, so check the rules where you are buying.

As a rough guide, set aside two to four thousand pounds for the process itself, plus a cushion for your first few months in the new home. A boiler that gives up in week three is not the moment to discover you have nothing left.

Before You Start Viewing

Get an Agreement in Principle from a lender. It is a free indication of how much they might lend, and estate agents take you more seriously when you have one. Check your credit report for errors, avoid applying for new credit cards or car finance in the months before you apply, and make sure you are registered on the electoral roll at your current address.

Above all, be patient with yourself. Saving a deposit while paying rent is genuinely hard, and progress can feel painfully slow. But every pound you put aside is doing two jobs at once: it is bringing the keys closer, and it is lowering the cost of the mortgage you will live with for decades.