£340,000 mortgage: monthly payments

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

Borrowing £340,000? At 4.5% over 25 years you would pay £1,889.83 a month. Every rate and term is compared below.

At 4.5% over 25 years
£1,890 a month
Total interest
£226,949
Income needed (4.5x)
£75,556
Overpay £170 a month
save £35,941
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Monthly payment£1,889.83a month

Borrowing £340,000 (89% loan to value). Total repaid £566,949, of which £226,949 is interest.

A £340,000 repayment mortgage at 4.5% over 25 years costs £1,889.83 a month. You would repay £566,949 in total, of which £226,949 is interest.

Monthly payments on £340,000 by rate and term

Rate 20 years 25 years 30 years 35 years
3.5% £1,972 £1,702 £1,527 £1,405
4% £2,060 £1,795 £1,623 £1,505
4.5% £2,151 £1,890 £1,723 £1,609
5% £2,244 £1,988 £1,825 £1,716
5.5% £2,339 £2,088 £1,930 £1,826
6% £2,436 £2,191 £2,038 £1,939

How £340,000 is paid off over 25 years

£0k£50k£100k£150k£200k£250k£300k£350k0y5y10y15y20y25y
  • 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 £340,000 by term

  1. 20 years£176,242 (£2,151 a month)
  2. 25 years£226,949 (£1,890 a month)
  3. 30 years£280,183 (£1,723 a month)
  4. 35 years£335,809 (£1,609 a month)

A longer term lowers the monthly payment but adds interest. Stretching from 25 to 35 years saves £281 a month and costs £108,860 more overall.

Keep going

Questions people ask

What are the monthly payments on a £340,000 mortgage?

£1,889.83 a month on a 25 year repayment mortgage at 4.5%. At 4% it is £1,794.65 and at 5% it is £1,987.61. Interest only at 4.5% would be £1,275.00.

What salary do I need for a £340,000 mortgage?

At the usual 4.5 times income, about £75,556 for a single buyer or a joint household income. Some lenders go to 5 or 5.5 times, which would need around £61,818.

How much does overpaying a £340,000 mortgage save?

Paying £170 extra a month at 4.5% clears it about 3 years 6 months early and saves roughly £35,941 in interest. Check your lender's overpayment limit, often 10% a year on fixed deals.