W-2 - An Employer must mail to the Employee their W-2 form by January 31st

W-3 - A Transmittal to the W-2. Employer must mail a W-3 with a copy of the W-2(s) to the Federal by March 15th

W-3N - A Transmittal to the W-2. Employer must mail a W-3N with a copy of the W-2(s) to the State by March 15th.