Employers are required to file their W-2 and W-3 copies to the Social Security Administration by January 31 in 2017.  In the past, employers had until the end of February to file W-2s if they were paper filing and until the end of March if they were electronically filing.  Extensions of time to file W-2s and W-3s is no longer automatic.  The SSA may grant one 30 day extension in extraordinary circumstances or catastrophe.