In 2007 I collected $712.02 in sales taxes, but i paid $1208.33 to the state comtproller. Did I overpay?? No! I under-collected! Aaarrgghh!!! I FORGOT to charge sales tax on 8 invoices to my second-biggest client. So, what do i do now--send 8 revised invoices to collect the sales tax retroactively? How emabarrasing! I think I'd rather not have my client think I am that flaky! Maybe I should just eat the $496 diiference and chalk it up as yet another very expensive "learing experience"?!?!?