IF you already filed...then you can't touch anything until after the IRS processes that file on 12 Feb or sometime the week after. Once you file...and hit that Transmit button, you cannot get it back or stop it.
1) IF the IRS "Rejects" your original tax filing....you can edit that dependent in...correct any other reason for the rejection, adn then re-e-file. (you Do Not "amend" if they reject your original filing...you just correct and re-e-file)
2) IF the IRS "Accepts" your original filing...then you have to wait for your original refund from the original (or pay any extra taxes due if that was the case) ..... and then......several weeks later you can start the special Amendment process to amend your taxes to add in that missed dependent.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
