Hey, late tax filers, the James A. Farley Main Post Office (Eighth Avenue between 31 and 33 Streets) is open until midnight tonight. The USPS also tells us, "For additional convenience mobile postal retail units will also be parked in front of the Post Office on Eighth Avenue with postal employees selling stamps and accepting mail. Many New York City Post Offices throughout the five boroughs are regularly open until 7:00 p.m. or 8:00 p.m. on weeknights like April 15. Consumers can call toll free 1-800-ASK-USPS (1-800-275-8777) or go on-line to usps.com for the business hours and Post Office locations closest to their ZIP Code." And more tips for last minute tax filers after the jump:

- Make sure you have proper postage, especially if you have extra forms or schedules. The Internal Revenue Service (IRS) will not accept tax filings without postage or with insufficient postage. The IRS returns all tax filings with insufficient postage to the sender, who is then charged with late-payment penalties. It costs 44-cents for a one ounce letter and 17-cents for each additional ounce. One ounce is about four pages.

- If you use a non-IRS labeled envelope, make sure you have the proper IRS address. Also, put your return address in the upper left-hand corner.

- Mail early in the day if you can, so you can save yourself a trip to the late collection locations and avoid traffic and the last-minute rush.

- Don’t use an office postage meter. The IRS doesn’t accept private postmarks as proof of timely filing.

- If you are depositing a tax return on April 15th in a blue Post Office Collection Box, be sure to mail it before the last collection time posted on the box.

- The Postal Service recommends getting the security of proof-of-mailing and proof-of-delivery of your tax returns -- use Certified Mail service ($2.80) with a Return Receipt ($2.30), plus the applicable postage.

- Tax forms are no longer available at Post Offices. Check at local libraries or online at http://www.irs.gov/ (Federal forms) or http://www.tax.state.ny.us/forms/ (NYS forms).

- Stamped packages weighing more than 13 ounces must be presented in person to a Post Office clerk to comply with FAA regulations.