You have to use a Form 1040X which will be available late in February. You do not just prepare a new 1040. Do not mail that. Un do the changes you made and wait for the Form 1040X. You have to be able to work from the return exactly as it appeared when it was sent to the IRS. And...mailed returns take longer to be processed. You do not want to confuse the IRS by sending in two mailed returns at the same time......the delay that causes will take months to unravel.
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