Mortgage rate change calculator
Mortgage rate change
See how a different rate could change repayments.
Compare a mortgage rate change
IllustrativePayment after rate change
£1,598
Monthly change+£143
Annual change+£1,712
Payment change+9.8%
Lifetime interest: +£39,376Balance at the change date: £250,000. The remaining term is unchanged.
Assumptions and limits⌄
Illustrative repayment-mortgage calculation only, not personalised advice or a mortgage offer. It excludes product fees, early repayment charges (ERCs), overpayments and lender affordability checks.
Dates use a whole-calendar-month convention. A selected date on or before today is modelled as immediate; a later day within a calendar month counts the next whole monthly payment before the change.
Scheduled payments and balances retain full precision during amortisation and are rounded only for display. The remaining term does not restart when the new rate begins.
Rate-change comparison
Payment and interest
| Scenario | Monthly payment | Total interest from today |
|---|---|---|
| Stay at 4.50% | £1,456 | £151,732 |
| Move to 5.50% now | £1,598 | £191,108 |
| Difference | +£143 | +£39,376 |