Most of my work is done on the web, so I generally receive payment through Paypal. When a payment notice arrives, I simply print it out and stick it in my "income" drawer. If I am payed by check or direct deposit, I make a photocopy of the check, or of the deposit notice on my bank statement and stick that in the income drawer as well. At the end of the year, my accountant gets it all, more power to her!
I also have a "receipts" drawer for keeping track of deductions, of course.
It's not as sophisticated as Excel, but it's quick, easy, and doesn't require much brain power--in other words, exactly right for me!
