The Federal Tax Deadline is looming. As long as your Federal Tax return is postmarked no later than April 17, you will be in the clear with the Internal Revenue Service. If youre filing late, keep in mind that most post offices in the area are now closed. Exceptions will be made for those filing at all-night automated postal centers. For those who choose to do that, you might want to keep in mind that you must use a debit or credit card, and it must be postmarked before midnight.