<prompt> Human: Hey guys. So Im really confused by this whole w-2 stuff. Im hearing all two different answers from lots of sources and I just want to know whats what for sure. So are W-2s just supposed to be postmarked by January 31st, or must they be received by the employee by the 31st?? If its the first case and it just has to be sent by the 31st, is the 31st being a Sunday a valid excuse for a company to wait till February 1st to send it?? Links to actual government websites would be awesome!!!  <response>: 1312016 is a Sunday, so Forms W-2 must be issued Internal Revenue Manual 21.3.6.4.7.1 no later than 212016.IRS cant initiate a formal W-2 complaint until 2162016, since the 14th is a Sunday and the 15th is a Federal holiday. 