The best thing in my opinion you could ever do is start using accounting software. I use QuickBooks Pro and recommend it highly. It was a bit overwhelming at first so I had a guy help me set it up and I have gradually started using more of the features. I actually hired my mother to work for about 3-4 hours a week to enter every supply house bill, I mean every line of every bill. Then I go back and "tag" each item to the appropriate customer. I enter each employees time each day (takes about 5 min) and when I generate an invoice for a customer automatically all of the time and materials for that customer pops up on the screen. I wonder how the heck I ever ran a business without it!
