£300,000 Mortgage Repayments (2026)
A £300,000 repayment mortgage at 5% over 25 years costs £1,754 a month. The table below covers rates from 3.5% to 6% and terms from 15 to 35 years.
| Rate | 15 yrs | 20 yrs | 25 yrs | 30 yrs | 35 yrs |
|---|---|---|---|---|---|
| 3.5% | £2,145 | £1,740 | £1,502 | £1,347 | £1,240 |
| 4% | £2,219 | £1,818 | £1,584 | £1,432 | £1,328 |
| 4.5% | £2,295 | £1,898 | £1,667 | £1,520 | £1,420 |
| 5% | £2,372 | £1,980 | £1,754 | £1,610 | £1,514 |
| 5.5% | £2,451 | £2,064 | £1,842 | £1,703 | £1,611 |
| 6% | £2,532 | £2,149 | £1,933 | £1,799 | £1,711 |
Different amount or rate? Use the mortgage repayment calculator.
How it's worked out
Figures use the standard repayment-mortgage formula (capital and interest, equal monthly payments): payment = loan × monthly rate ÷ (1 − (1 + monthly rate)−months). They assume the rate stays the same for the whole term — in practice you'll re-fix every few years. Product fees, valuation fees and overpayments are not included.
FAQ
What are the monthly repayments on a £300,000 mortgage?
At a 5% interest rate over 25 years, a £300,000 repayment mortgage costs £1,754 a month — £526,131 repaid in total over the term. At 4% the same mortgage is £1,584 a month, and stretching to 30 years at 5% lowers the payment to £1,610.
How does the term length change the cost?
Longer terms cut the monthly payment but increase the total interest dramatically. On £300,000 at 5%, a 15-year term costs £2,372 a month (£427,029 total), while a 35-year term costs £1,514 a month but £635,906 in total — the longer term repays far more interest for the same loan.
Are these figures exact quotes?
No — they are standard repayment-mortgage arithmetic (capital and interest, fixed rate for the whole term) to help you budget. A real offer depends on your deal period, fees, loan-to-value and credit profile, and rates change when a fixed deal ends. Interest-only mortgages cost less per month but repay none of the capital.