£600,000 mortgage: monthly payments

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

Borrowing £600,000? At 4.5% over 25 years you would pay £3,334.99 a month. Every rate and term is compared below.

At 4.5% over 25 years
£3,335 a month
Total interest
£400,497
Income needed (4.5x)
£133,333
Overpay £300 a month
save £63,423
  • HMRC 2026/27 rates
  • Private: nothing leaves your device
  • Free, no sign-up

Monthly payment£3,334.99a month

Borrowing £600,000 (90% loan to value). Total repaid £1,000,497, of which £400,497 is interest.

A £600,000 repayment mortgage at 4.5% over 25 years costs £3,334.99 a month. You would repay £1,000,497 in total, of which £400,497 is interest.

Monthly payments on £600,000 by rate and term

Rate 20 years 25 years 30 years 35 years
3.5% £3,480 £3,004 £2,694 £2,480
4% £3,636 £3,167 £2,864 £2,657
4.5% £3,796 £3,335 £3,040 £2,840
5% £3,960 £3,508 £3,221 £3,028
5.5% £4,127 £3,685 £3,407 £3,222
6% £4,299 £3,866 £3,597 £3,421

How £600,000 is paid off over 25 years

£0k£50k£100k£150k£200k£250k£300k£350k£400k£450k£500k£550k£600k0y5y10y15y20y25y
  • 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 £600,000 by term

  1. 20 years£311,016 (£3,796 a month)
  2. 25 years£400,497 (£3,335 a month)
  3. 30 years£494,440 (£3,040 a month)
  4. 35 years£592,607 (£2,840 a month)

A longer term lowers the monthly payment but adds interest. Stretching from 25 to 35 years saves £495 a month and costs £192,110 more overall.

Keep going

Questions people ask

What are the monthly payments on a £600,000 mortgage?

£3,334.99 a month on a 25 year repayment mortgage at 4.5%. At 4% it is £3,167.02 and at 5% it is £3,507.54. Interest only at 4.5% would be £2,250.00.

What salary do I need for a £600,000 mortgage?

At the usual 4.5 times income, about £133,333 for a single buyer or a joint household income. Some lenders go to 5 or 5.5 times, which would need around £109,091.

How much does overpaying a £600,000 mortgage save?

Paying £300 extra a month at 4.5% clears it about 3 years 6 months early and saves roughly £63,423 in interest. Check your lender's overpayment limit, often 10% a year on fixed deals.