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MortgageMetrics

Deposit savings planner

See how long it'll take to save your deposit, allowing for interest, rising prices and the Lifetime ISA bonus, and what to save each month.

Free, no sign-up Last reviewed 3 October 2026

Your details

= — today

Your target rises as prices do.

Your savings year by year

YearSavedDeposit needed

How much deposit do you need?

A 5% deposit is the minimum for most mortgages, but rates fall at each 5% step of loan-to-value, with the biggest improvements at 10%, 15% and 25%. Remember to save for the costs of buying too: legal fees, survey and moving, plus stamp duty if your home costs more than the first-time buyer threshold.

Getting there faster

  • Lifetime ISA: the 25% bonus is the best guaranteed return available to most first-time buyers. You must open the account at least 12 months before you buy.
  • Shared ownership: you only need a deposit on the share you buy. See the shared ownership calculator.
  • Family help: a gifted deposit is accepted by most lenders with a signed gift letter.
  • See the government schemes guide for help in each UK nation.

Assumptions

  • Interest is added monthly and is tax-free, as in a cash ISA or Lifetime ISA.
  • The Lifetime ISA bonus is added as you save, on up to £4,000 of contributions each year. Anything above that goes into ordinary savings.
  • House prices rise steadily at the rate you choose.

Frequently asked questions

How much deposit do I need to buy a house?

Most lenders need at least 5% of the price, but 10% or 15% gives you access to noticeably better rates. You also need cash for stamp duty, legal fees and moving costs on top of the deposit.

How does the Lifetime ISA work?

If you're aged 18 to 39 you can open a Lifetime ISA and save up to £4,000 a year. The government adds a 25% bonus, up to £1,000 a year. You can use it towards your first home if it costs £450,000 or less and the account has been open for at least 12 months.

What happens if my home costs more than the Lifetime ISA limit?

Withdrawing for a home over £450,000 counts as an unauthorised withdrawal and carries a 25% charge, so you lose the bonus and some of your own money too.

Is the Lifetime ISA being replaced?

The government has said it plans a simpler first-time buyer ISA to replace the Lifetime ISA for new savers. Existing accounts are expected to keep working as they do now. Check GOV.UK for the latest position before opening one.

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