Auto calculate finance charge percentage
I am a new user to QB and I want to be able to run the reports for late invoices and assess finance charges on those. I figured out how to do it with a flat fee, but is there a way to have QB auto calculate the fee based on a percentage of the balance? (ie 10% of the total due after 30 days)? I see an annual interest option but that doesnt seem to assess anything when i tell it to add the charges on overdue invoices. Thanks for the help in advance.