# Late Payment Interest Calculator

Calculate simple daily interest and total late charges on an overdue invoice using an annual rate, grace period, and day-count basis.

Canonical: https://finamodel.com/tools/late-payment-interest-calculator

## How to use it

Open the interactive calculator, enter your assumptions, and review the calculated outputs. Inputs stay in your browser.

## Related resources

- [Financial model templates](https://finamodel.com/templates)
- [Financial modelling guides](https://finamodel.com/blog)