<prompt> Human: We are getting our marriage license in May 2013. However, we are planning to file our 2013 taxes together as married. My question is whether we can put married on our W-4 as of January 2013?EDIT: Thank you, everyone for responding and giving your advices. I have to clarify that I we are planning to file our 2013 taxes in 2014. I apologize for the confusion.  <response>: yes and you should so as not to give the government an interest free loan. 