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Overpayment

Mortgage overpayment calculator

Enter a one-off or monthly overpayment — we show both scenarios and how much interest you actually save.

Save this result?

We'll send the PDF and let you know when market conditions change — e.g. after an NBP decision or when your bank cuts its margin.

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Frequently asked questions

Which is better — lower instalment or shorter term?

Shortening the term usually saves more interest; lowering the instalment gives budget flexibility. We show both without pushing either.

Is overpayment always allowed?

It depends on your contract — some loans restrict overpayment in the first 36 months. Check the terms.

Overpay or keep it in a deposit?

If your loan rate is higher than the real after-tax deposit rate, overpaying usually wins.

Estimates only; not investment advice. Terms depend on your contract.