As we approach the new year, it is a good time think about your W-2 or 1099-R. Generally, an employer is required to give you a completed W-2 form for the calendar year by January 31 of the next year. However, if the 31st falls on a Saturday, Sunday, or legal holiday, the employer has until the next business day to send out the W-2. A 2011 W-2 must be given by Jan. 31, 2012, but since that falls on a Sunday, you should have it by Feb. 1, 2012.
For more information, see: http://www.irs.gov/taxtopics/tc154.html