I use a spreadsheet to manage our files also, but it is rather different in some ways. We don't enter the clients in advance, instead we use it to log in work as it comes in the door. Then there are columns for the date it came in, the date we promised it back, who is working on it, etc. etc. When everything is completed, (we are paid, the e-file is accepted, and the client picked up their copy) we highlight it in yellow. I also have tabs for each month to keep up with information returns for bookkeeping clients such as tax deposits, sales tax, quarterly reports, etc. I like the easy way excel can sort information based on any column that you choose.