Home loans
Lump sum repayment calculator
Find out how much interest a one-off lump sum payment could save, and how much sooner you could own your home.
How this calculator works
- Assumes you keep making the same repayments after the lump sum.
- Uses the interest rate you enter for the whole loan.
- Some fixed-rate loans charge break costs for large extra payments.
This calculator gives estimates for general information only. It isn't a quote, an offer or an approval, and it doesn't consider your objectives, financial situation or needs. Results depend on the figures you enter and the assumptions above.
Want a real number?
Calculators are a starting point. In a 20-minute call we can tell you what lenders are likely to say about your situation.

