I am worried about usury. In our state, we cannot charge compound interest (interest on interest). Is there a way to have a one-time charge that will not have interest charged against it on future invoices, although the same client is charged interest on fees and cost? Or, is there a way to reverse out a credit that was given shown on the client invoice more than three invoices ago, for which, $2,000 was credited from the interest charged and $18,000 was for fees. The total is $20,000.

I have a client whom I gave a temporary credit to that was to become permanent if the client did something. The temporary credit was for $20,000. We continued working for the client and invoicing him monthly. As it turned out, the client did not do what they were supposed to do, and I will reverse the credit; however, the credit is made up of $18,000 in fees and $2,000 in interest. I can add a transaction invoice using the prior date for the $18,000 but how do I add the $2,000 for interest to Timeslips, so Timeslips knows not to charge interest on the $2,000? Is there some kind of “special charge?”