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Part of our UK mortgage rates guide. See the main pillar for the full lender comparison, FRN-verified best buys by LTV band and worked-example payments: Best Mortgage Rates UK 2026. |
Should you overpay your mortgage?Overpaying your mortgage means paying more than your required monthly amount, reducing your outstanding balance faster. This saves interest over the life of the mortgage and shortens the term. Whether overpaying is the right move depends on your mortgage interest rate versus the returns available on savings — and whether you have more expensive debt elsewhere. On a 4.5% mortgage, overpaying is equivalent to earning a guaranteed 4.5% return on savings — tax-free. If your savings account pays less than your mortgage rate, overpaying is almost always the better financial decision. How much can mortgage overpayments save?
Overpayment limits on fixed rate mortgagesMost fixed-rate mortgages allow overpayments of up to 10% of the outstanding balance per calendar year without incurring an early repayment charge (ERC). Exceeding this limit typically triggers an ERC of 1 to 5% on the excess amount. Tracker and variable rate mortgages usually allow unlimited overpayments.
Overpaying vs saving: which is better?
Does overpaying reduce my monthly payment or term?This depends on your lender. Some automatically reduce the monthly payment when you overpay; others keep payments the same but shorten the term. Shortening the term saves significantly more interest over time. Specify your preference when making overpayments — most lenders offer both options. How to make a mortgage overpayment
Verdict Overpay if your mortgage rate exceeds your savings rate With mortgage rates at 4 to 5% and savings rates at 4.5 to 5%, the decision is currently marginal for many borrowers. If your mortgage rate exceeds your best available savings rate (especially in an ISA), overpaying is the clear winner. Always ensure you have an emergency fund before overpaying. Frequently asked questionsCan I overpay my mortgage without penalty? On most fixed-rate mortgages, yes — up to 10% of the outstanding balance per year without penalty. Check your mortgage terms for your specific allowance. Tracker and variable mortgages typically allow unlimited overpayments. Is it better to overpay mortgage or put money in ISA? If your mortgage rate is higher than your best ISA rate, overpay. If your ISA rate is higher (e.g. a 5% Cash ISA versus a 4% mortgage), save in the ISA — the return beats the interest you would save by overpaying. Do mortgage overpayments affect my credit score? Positively — reducing your outstanding mortgage balance improves your LTV, which can give you access to better rates at remortgage. Overpayments themselves do not directly affect your credit score. What happens to overpayments if I remortgage? Overpayments reduce your outstanding balance, so when you remortgage, you have a lower loan amount — potentially moving you into a better LTV band and rate. Any unused 10% overpayment allowance from the current year does not carry forward to a new mortgage deal. |
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