This is a question of "How much do you trust your clients?" Usually this is not a good idea. The recalculate button is designed for them to run diff scenarios while they are on their 7 day trial. Once they have been activated, if they run their plan for 4 months and then recalculate, their "To-date savings" total will be lost and will start back at 0. Have your clients contact you if they need to restart the program. It will be easier since you know what you are doing.