<prompt> Human: I plan on claiming my future son on my return when I file at end of the year. He will be born in August, but Ive already adjusted my W-4. Is this okay or do I adjust it after he is born?  <response>: You can do pretty much whatever you want with your w-4. Its for estimation purposes and the IRS doesnt really care what you do with it. Just keep in mind that come 2014, when you file your return, thats when your real tax load is calculated and depending on what you put on the w-4, you will get a big return, break even, or a big bill. 