Mortgage Overpayment Calculator
See how a monthly overpayment reduces the interest you pay and shortens your mortgage term.
£
%
yrs
£
Interest saved
£36,280.39
Term saved6y 1m
Scheduled monthly£1,111.66
New monthly (with overpay)£1,311.66
New term18y 11m
Assumptions
- Nominal annual rate compounded monthly (rate ÷ 12) held constant for the remaining term.
- The overpayment starts this month and continues every month until the loan is cleared.
- No product fees, arrangement fees or early-repayment charges are modelled.
- Many UK lenders cap penalty-free overpayments (a 10% annual allowance is common on fixed deals, but limits vary) — check your product terms before increasing payments.