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Mortgage Overpayment Calculator

Enter your mortgage and a monthly overpayment to see the interest and time saved.

Estimate for general information only — not financial, mortgage, tax or legal advice. Confirm figures with GOV.UK, your lender or a qualified adviser before you commit.

Overpaying your mortgage — even by a small amount each month — cuts the balance faster, so you pay interest for less time. This shows the interest you would save and how many years you would knock off. Most lenders let you overpay up to 10 percent of the balance each year without a penalty; check yours first.

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Frequently asked questions

Is it better to overpay or save?

If your mortgage rate is higher than the interest on savings (after tax), overpaying usually wins. Keep an emergency fund first, though.

Will I be charged for overpaying?

Many fixed deals allow overpayments up to 10 percent of the balance a year penalty-free. Beyond that, an early repayment charge may apply.