You are required to pay quarterly. If you do it all in April, they will usually charge you some kind of penalty fee. (Somewhere in the $200 range) I know this because that is what we have to pay every year. : P Maybe one of these years we will get it together enough to do the quarterlies.

I despise paying taxes.

*Gets on her soapbox*

But, I think if everyone in America had to pay taxes like we do-- write a big check and actually see the money go away, they would have another tax revolt. Witholding just shields people from the enormity of our tax burden.

*Gets down off her soapbox*

Good luck on the taxes. : )