We are using Sage Timeslips Premium, Build 30.0.6.110. We currently have the interest type set to "Compound". If we switch it to "Simple" how will this affect clients that already have past due invoices with accumulated compound interest? Per a previous online chat I had with Sage, I understand the old past due invoices that were compound will have that incurred interest amount owed as a previous balance and any new interest that is incurred will be calculated as simple interest. Does that mean that going forward interest on the old past due invoices will be calculated only on the fees & costs that are past due, not the past due interest that is included in the entire previous balance?