Mortgage overpayment calculators
Regular overpayments are the single most powerful way to cut lifetime mortgage cost. Model how much interest and time you'd save at your rate — before ERCs are triggered.
Mortgage overpayment calculator
Enter your figures, then add your name and phone to reveal the result. Free, no credit check.
More overpayments calculators
Lump sum overpayment calculator
One-off overpayment (e.g. bonus, inheritance) — impact on term and interest.
Monthly overpayment calculator
Same-amount, every-month view — the most common setup.
Mortgage payoff calculator
Total months to clear the balance under a chosen overpayment strategy.
Time saved calculator
How many months/years the overpayment removes from the term.
Interest saved calculator
Cash interest saved over the remaining term.
Every scenario above depends on lender-specific criteria (income multiples, ICR, stress rates, credit profile). A vetted FCA-regulated broker will run the exact numbers for your situation in one working day.
Frequently asked questions
Can I overpay a UK fixed-rate mortgage?
Yes — most UK lenders allow 10% of the balance per calendar year during a fix without triggering an early repayment charge (ERC). Over that, ERC of 1–5% typically applies.
Is it better to overpay my UK mortgage or invest?
Rule of thumb: overpay if your mortgage rate is higher than your after-tax investment return. In a high-rate environment, overpaying is often the mathematically strongest risk-free option.
Should I overpay my mortgage or my pension?
Pension wins for higher-rate taxpayers because of 40% relief; overpaying wins if you're basic-rate and the mortgage rate is above ~4%. Do both if you can.
Does overpaying reduce my UK mortgage term or payment?
It reduces the term by default with most lenders (bigger interest saving). Ask to reduce the monthly payment instead if cashflow is tight — either is available on request.
What's the early repayment charge on a UK mortgage?
Usually 1–5% of the balance repaid over the allowance, tapering by year (5% year 1, 4% year 2, etc.). It's set out on page 3 of your mortgage offer.
Can I overpay a Help to Buy Equity Loan?
Yes — you can partially staircase from year 1 in blocks of 10% (min £2,500). Each staircase needs a fresh RICS valuation and repays a % of current property value, not original loan.
Do UK lenders let me set up regular monthly overpayments?
Yes — nearly all offer standing-order monthly overpayments online with no fee. Lump sums usually go via bank transfer with a reference number.