If you actually hit the transmit button.....You can't.
You effectively put it in the mailbox at the Post Office.
Now you wait until the IRS "starts" processing the week of 27 January. (no guarantee how many days later they will actually pull yours. sometimes they pull some test files earlier).
1) IF..if the IRS rejects your efile, then you can just EDIT your tax file and resubmit. DO NOT Amend in this situation. (IF the IRS rejects, the state forms don't go to the state either).
2) IF...if...the IRS "Accepts" what you filed, then you will be stuck going thru the Amend process to correct everything. And you have to print and paper-mail in the amended forms yourself at the Post office . Don't amend until you get your refund, or pay the balance due form the first filing....and don't do anything to amend until the end of February.
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We repeat this many times...NEVER file before mid February....1 March is safer. (Unless you are a victim if ID theft...but even then 1 Feb is better)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
