£170,000 mortgage: monthly payments

By The PocketSums team. Updated 30 September 2026. How we calculate

Borrowing £170,000? At 4.5% over 25 years you would pay £944.92 a month. Every rate and term is compared below.

At 4.5% over 25 years
£945 a month
Total interest
£113,476
Income needed (4.5x)
£37,778
Overpay £90 a month
save £18,845
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Monthly payment£944.92a month

Borrowing £170,000 (89% loan to value). Total repaid £283,476, of which £113,476 is interest.

A £170,000 repayment mortgage at 4.5% over 25 years costs £944.92 a month. You would repay £283,476 in total, of which £113,476 is interest.

Monthly payments on £170,000 by rate and term

Rate 20 years 25 years 30 years 35 years
3.5% £986 £851 £763 £703
4% £1,030 £897 £812 £753
4.5% £1,076 £945 £861 £805
5% £1,122 £994 £913 £858
5.5% £1,169 £1,044 £965 £913
6% £1,218 £1,095 £1,019 £969

How £170,000 is paid off over 25 years

£0k£50k£100k£150k£200k0y5y10y15y20y25y
  • Balance still owed
  • Interest paid so far
At 4.5%. Interest is heaviest in the early years, when the balance is highest.

Total interest on £170,000 by term

  1. 20 years£88,120 (£1,076 a month)
  2. 25 years£113,476 (£945 a month)
  3. 30 years£140,093 (£861 a month)
  4. 35 years£167,907 (£805 a month)

A longer term lowers the monthly payment but adds interest. Stretching from 25 to 35 years saves £140 a month and costs £54,431 more overall.

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Questions people ask

What are the monthly payments on a £170,000 mortgage?

£944.92 a month on a 25 year repayment mortgage at 4.5%. At 4% it is £897.32 and at 5% it is £993.80. Interest only at 4.5% would be £637.50.

What salary do I need for a £170,000 mortgage?

At the usual 4.5 times income, about £37,778 for a single buyer or a joint household income. Some lenders go to 5 or 5.5 times, which would need around £30,909.

How much does overpaying a £170,000 mortgage save?

Paying £90 extra a month at 4.5% clears it about 3 years 8 months early and saves roughly £18,845 in interest. Check your lender's overpayment limit, often 10% a year on fixed deals.