CHICAGO - NOVEMBER 1: Current federal tax forms are distributed at the offices of the Internal Revenue Service November 1, 2005 in Chicago, Illinois. A presidential panel today recommended a complete overhaul of virtually every tax law for individuals and businesses. (Photo Illustration by Scott Olson/Getty Images)
The dreaded tax day has finally arrived. You had a few extra days this year to file, but if you still put things off, here's what you need to know before the clock strikes midnight.
Your taxes must be postmarked April 18, 2011 in order to avoid a penalty. Same for that extension if you're filing one.
If you're cutting it close, here's a list of post offices that are open late tonight:
To find the hours of your local post office, click here.
For information on e-filing, visit irs.gov.