Overpaying your mortgage: shorter term or lower installment?

Extra payments save interest – but you usually have to choose what they reduce. Which option saves more?

Kready · 2026-08-14

If you have spare money, you can overpay your mortgage – repay part of the principal earlier.

Option 1: shorten the term

  • The installment stays roughly the same.
  • The loan ends earlier.
  • Maximum interest saving.

Option 2: lower the installment

  • The term stays the same.
  • Each monthly payment becomes smaller.
  • More flexibility in your monthly budget, smaller saving than option 1.

Which to choose?

  • Stable income and a financial cushion? Shorter term saves the most.
  • Want security in case of worse months? Lower installment.
  • Planning a refinance or new loan? A lower installment can improve creditworthiness.

Check the fees

Overpayments may be subject to a fee in the first 3 years of a variable-rate loan or during a fixed-rate period. Many banks allow free overpayments online.

Overpay or invest?

If your savings earn less than your mortgage rate, overpaying is usually a safe, guaranteed "return". Keep an emergency fund first.

See exactly how much you would save – and how the installment and end date change – in our overpayment calculator.

Want to know how your current loan compares with today's offers? Try the refinance option in the calculator.

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