I am married but never bothered to send a modified W4 to my employer stating a change of marital status from S to M. So, my withholding on my paycheck is based on S (obviously). When I file my return I file it as Married filing Jointly. Now my question is, Is it fine to leave my marital status as S in my pay stub? or should I immediately change it? What are the repercussions since I should have changed it at least a year back? Thanks