No Invoicing software would be complete with tracking your income from transactions. This is one of the three transaction screens available, this screen shows cash transactions for the day. Other screens show transactions by Technician and cash transactions on completed work orders. A full end of day and monthly/yearly record is kept.
Work Order Transactions Screen
This is the end of day screen.
Once a day you should print the summary or detailed report and purge and copy cash file.
This will give you the reports for cash history showing income and taxes for any time period you choose.