How can you find out what your tax liability is if you haven't done your taxes yet?

Java

Obviously, you can't.

I assume you are asking this because you want to file an extension.

Take your best guess or use last year's liability if nothing significant has changed.

Do a rough estimate, this calculator might help:

Java/Tax10402008.html">http://www.dinkytown.net/Java/Tax10402008.html

Or if your income went up by 10% since last year, add 10% to last year's taxes (you just need a rough estimate).