
Originally Posted by
Norellicus
No, and they'll still penalize you for filing late without an extension and/or waiver to penalty.
They could care less if you under-claim and leave extra money in their pockets, but they're damn sure to get it from you anytime they can prove it's due :D
OP: There's not really a good way to tell how much you actually owe without your forms, unless your paystub shows the cumulative 2009 tax withholdings as well (some do, some don't). That's the important part, how much you made is only relevant to the total tax you owe.