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House Deposit Calculator

The deposit decides two things at once: whether you can buy at a given price, and what rate you will pay on the mortgage behind it. Moving from a 5% to a 10% deposit changes both, and the difference is usually larger than people expect.

Enter a target price and the deposit percentage you are aiming for to see the cash required, the mortgage it leaves and how far your current savings get you.

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House Deposit Calculator

Common choices are 5, 10, 15, 20 or 25 per cent. Any figure can be entered.

Deposit required

£25,000.00

Mortgage required£225,000.00
Resulting loan to value90%
Still to save£10,000.00
Deposit at 5%£12,500.00 — mortgage £237,500.00
Deposit at 10%£25,000.00 — mortgage £225,000.00
Deposit at 15%£37,500.00 — mortgage £212,500.00
Deposit at 20%£50,000.00 — mortgage £200,000.00
Deposit at 25%£62,500.00 — mortgage £187,500.00

A higher deposit usually unlocks better rates. Small-deposit mortgages exist but are not available to everyone or on every property.

Reading the result

The deposit required is the cash you need for the purchase itself. Buying costs such as Stamp Duty, Land and Buildings Transaction Tax, Land Transaction Tax, surveys, legal fees and moving costs sit on top and are not included.

The comparison rows show the same property price at five common deposit levels so you can see what another few thousand pounds of saving would do to the loan and the band.

How it works

The deposit is the price multiplied by the deposit percentage. The mortgage required is the price minus that deposit, and the loan to value is 100 minus the deposit percentage.

Your savings are compared with the deposit required to show either the shortfall still to save or the surplus available for other buying costs.

Worked examples

A 10% deposit on a £250,000 home

A buyer with £15,000 saved is targeting a £250,000 property.

  1. Multiply £250,000 by 10% to get a £25,000 deposit.
  2. Subtract the deposit from the price for a £225,000 mortgage at 90% LTV.
  3. Compare £15,000 of savings with the £25,000 required.

A £25,000 deposit, a £225,000 mortgage at 90% LTV, and £10,000 still to save.

The default scenario on this page

Target property price (£): 250000; Target deposit (%): 10; Savings you have now (£): 15000

  1. The deposit is the price multiplied by the deposit percentage. The mortgage required is the price minus that deposit, and the loan to value is 100 minus the deposit percentage.
  2. Mortgage required: £225,000.00
  3. Resulting loan to value: 90%
  4. Still to save: £10,000.00
  5. Deposit at 5%: £12,500.00 — mortgage £237,500.00
  6. Deposit at 10%: £25,000.00 — mortgage £225,000.00
  7. Deposit at 15%: £37,500.00 — mortgage £212,500.00
  8. Deposit at 20%: £50,000.00 — mortgage £200,000.00
  9. Deposit at 25%: £62,500.00 — mortgage £187,500.00

Deposit required: £25,000.00

Assumptions

The result depends on the following. If any of them do not match your situation, treat the figure as indicative only.

  • The deposit comes from your own savings or a gift already available, not from borrowing.
  • The purchase price is the agreed price, and the lender’s valuation matches it.

What this calculator does not do

  • Purchase taxes, legal fees, surveys, broker fees and moving costs are excluded. Budget for these separately.
  • A 5% deposit does not guarantee a 95% mortgage. Availability depends on the lender, the property type and your circumstances.
  • New-build, shared ownership and leasehold purchases can carry different deposit requirements.

Methodology

Straightforward percentage arithmetic, with the comparison table generated at fixed 5, 10, 15, 20 and 25 per cent levels for the price entered. Nothing is rounded before the final display.

Frequently asked questions

How much deposit do I actually need?

Five per cent is the usual minimum where a lender offers it, ten per cent widens the choice considerably, and rates typically keep improving up to around forty per cent.

Do I need extra money beyond the deposit?

Yes. Expect legal fees, a survey, possible purchase tax and moving costs. Many buyers set aside a few thousand pounds on top of the deposit.

Does a bigger deposit reduce my monthly payment?

Twice over: the loan is smaller, and the lower loan to value usually attracts a lower interest rate. Use the mortgage repayment calculator with each scenario to compare.

Please note: Results are estimates for general information only and are not financial, tax or legal advice. Figures depend on the assumptions listed on each page and on your personal circumstances.