£400,000 Mortgage Monthly Payments

At 4.5% over 25 years, you would pay approximately £2,224 per month on a £400,000 mortgage, with total interest of around £267,000 over the full term.

At this balance, even small rate differences matter. A 0.5% lower rate (4.0%) saves you roughly £120/month and £36,000 over the term.

A monthly overpayment of £300 could save approximately £65,000 in interest and knock 6 years off your mortgage. Consider whether overpaying beats investing — read our mortgage vs ISA guide for a comparison.