The Bayside at 5p.m. on the nose today, tax day.
If you're keen on using USPS, the Flushing location at 4165 Main Street is open until 8p.m. It's a good option perhaps if you're taking the LIRR from Manhattan, and can stop in Flushing on the way home.
, at 4206a Bell Blvd., is open until 7p.m., which are their regular hours.
There's also a FedEx drop-off location at the S, which is open until 7p.m.
FedEx has several other drop-off locations in the area, but those two locations are opened the latest.
Or you can file your Federal, New York State or taxes online. New York City income tax is collected from New York State.