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Simple Daily Interest Calculator

The following on-line calculator allows you to automatically determine the amount of simple daily interest owed on payments made after the payment due date. To use this calculator you must enter the numbers of days late, the amount of the invoice in which payment was made late, and the Prompt Payment interest rate, which is pre-populated in the box. If your payment is over 30 days late, please use the monthly compounding interest calculator.


Please do not enter commas.

Please enter the principal amount:   
Please enter the number of days late:   

Please enter the Prompt Payment interest rate:   %


   Last Updated:  Wednesday March 04, 2009

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