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Mortgage Overpayment Calculator (UK)

See how much time and interest you save by overpaying your UK mortgage each month.

Also try:🏡 Mortgage 🏦 Mortgage Refinance — Compare Old vs New Payment 🏡 Interest-Only Mortgage (UK)

💱 Amounts shown in selected currency. Rates are approximate — for exact rates check your bank.

About This Calculator

Simulates your mortgage payoff with a chosen monthly overpayment on top of your standard payment, showing the new payoff time and total interest saved versus the original term.

About This Calculator

Simulates your mortgage payoff with a chosen monthly overpayment on top of your standard payment, showing the new payoff time and total interest saved versus the original term.

Frequently Asked Questions

How much can I overpay without a penalty?

Most UK mortgage lenders allow overpayments of up to 10% of the outstanding balance per year without an Early Repayment Charge — check your specific mortgage terms.

Does overpaying reduce my monthly payment or my term?

This depends on your lender — most UK mortgages reduce the term by default while keeping the monthly payment the same, unless you request a recalculation.