What the result means
It is an informational estimate based on your entries and eligibility assumption, not advice or a determination of entitlement.
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Estimate late-payment interest with the working shown.
Enter the invoice amount, due date, calculation date and annual rate. The tool shows the day count, daily rate and rounded estimate without saving anonymous inputs to a case.
When to create a case
If the invoice remains unpaid, a saved case keeps the calculation beside the messages, evidence and next actions.