Finance Tools
Late Payment Interest Calculator
Calculate interest charges on overdue payments using principal amount, interest rate, and number of late days.
Calculate interest charged on overdue payments.
How to use this late payment interest calculator
- Enter the principal amount owed.
- Enter the annual interest rate applied to late payments.
- Enter how many days the payment is overdue.
- Click Calculate to see the late interest amount and total owed.
Example
For example, if someone owes $1,200 at a 12% annual late payment rate and is 40 days late, this calculator will show:
- Interest charged for the overdue period.
- Total amount owed including interest.
- Effective daily interest rate impact.
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