It does not have to be an expensive mistake---just a mistake that will take longer. You can still claim him if he made less than $4300, but you cannot e-file. Your e-file will be rejected so you need to file by mail in order to claim your son. Print, sign and mail in your 2021 return.
Meanwhile after the IRS processes his return he will need to amend and change the way he answered the question in My Info as to whether he could be claimed as a dependent. And...if he gets the $1400 recovery rebate credit as part of his refund on that incorrect return he sent, he will have to pay it back.
Waiting for him to amend will not help you to e-file. Now that his SSN is in the system this year the only way you can claim him and file will be by mail.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
