He will have to amend it then. If he filed his taxes using TurboTax, since his return has already processed, he can now amend his return on TurboTax. And that can be done be selecting "Amend My Tax Return" and following the prompts. It will walk you through.
To amend if he did not use TurboTax, he will have to send a copy of his his original tax return and Form 1040X. He will have to indicate that that box should be unchecked. I am including some helpful links on amending your tax return. He may have to repay some of his refund as his standard deduction will change. He may also have to amend his state return.
Your tax return will be rejected if you claim him, and you will now have to mail in your tax returns in order to claim him as a dependent.
If you can be claimed as a dependent by another taxpayer, your standard deduction for 2022 is limited to the greater of: (1) $1,150, or (2) your earned income plus $400 (but the total can't be more than the basic standard deduction for your filing status).
Click here for instructions to Form 1040X.
Click here for How to Correct Federal Taxes.
Click here for additional information on dependents.
Click here for additional information on amending your tax return.
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