Hi Sandra,
Perhaps you need to change the interest calculation method in the Company Profile from Overdue Balance to Overdue Invoices?
For example, customer BSC01 in sample data has a balance of 7077.44 and if I change the interest rate to 10%, the interest invoice is 4741.80 based on Overdue Invoices. Based on Overdue Balance, it's only 58.15.
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Regards,
Softrak Tech Support