I received a lock in letter stating that i'm to be locked in for "single zero allowances". Now I'm married and also had a child this year. I'm not sure what prompted the IRS to tell my employer this but I let my CPA know and he says that I should just wait it out since there's not much paychecks left this year. I'll take a hit for the first couple months next year but then when I get my tax return - where we will file "married and an exemption for a child" and receive our refund, I will go to our payroll and show them. Then I can request to file a new W-4 because as my CPA states legally we can change our W-4 at any time. Does this sound correct to you?