GSA_Buchhalter - Version 2011 The GSA Buchhalter is a software for all self-employed persons and small firms, who do not need a double entry bookkeeping. The program is easy to use and is not overloaded with unnecessary functions.The GSA Buchhalter is a software for all self-employed persons and small companies who do not need a double entry bookkeeping. The program is easy to use and is not overloaded with unnecessary functions.The application can manage unlimited entries of your customers and their in- and outcomes. The booking accounts are freely configurable and each of them can be changed at every time. You get an immediate overview of all bookings in a graphical diagram. The time period in this overview is changeable to monthly, yearly or to a free date.