Updated for 2026/27
Monthly payment on a £420,000 mortgage
Quick answer
A £420,000 repayment mortgage over 25 years at 5% costs about £2,455 a month. Over the full term you'd repay £736,583 in total, including £316,583 of interest.
Reviewed by TaxFly Editorial Team
How we calculate
- Mortgage amount
- £420,000
- Interest rate
- 5%
- Term
- 25 years
- Total interest
- £316,583
- Monthly payment
- £2,455
What are the monthly repayments on a £420,000 mortgage?
A £420,000 repayment mortgage at 5% over 25 years works out to roughly £2,455 a month. The rate you're offered makes a big difference, so here's how the monthly payment changes:
| Rate | 25-yr monthly | 30-yr monthly |
|---|---|---|
| 4.0% | £2,217 | £2,005 |
| 4.5% | £2,334 | £2,128 |
| 5.0% | £2,455 | £2,255 |
| 5.5% | £2,579 | £2,385 |
| 6.0% | £2,706 | £2,518 |
How much interest will you pay?
Over the 25-year term you'd pay about £316,583 in interest on top of the £420,000 borrowed — a total of £736,583. Overpaying even a small amount each month can cut years off the term and save thousands. Model overpayments and compare deals on the mortgage calculator.
Other mortgage amounts
Frequently asked questions
About £2,455 a month on a 25-year repayment mortgage at 5%. A different rate or term changes this — see the table above.
Around £316,583 over 25 years at 5%, making £736,583 repaid in total.
Lenders typically cap borrowing at about 4.5× income, so roughly £93,333 household income — though this varies. Check affordability on our mortgage tools.
