Late Payment Interest Calculator

How is it calculated?

1. Late interest applies for each month from the due date to the payment date; partial months are prorated by day (30 days = 1 month).
2. When the rate changes, each period uses its own rate.
3. Interest is simple and charged on the principal only.

Results are for information only and use 2026 parameters. Incentives, exemptions and personal circumstances may change the result; consult us for an exact figure.