Many business tax forms offer extension forms that businesses can file in order to put off their tax filing for a later date. There's a catch, though you'll need to file the extension prior to the same deadline that you would have needed to file the initial form on. If you've blown that deadline entirely, you're officially late on your taxes.
The solution: File them anyway. You'll face an annoying penalty fee, but it's better than not filing at all, as you'll eventually get the IRS knocking on your door otherwise.