What tax year was this for?
Your teenager has to amend his return and pay that money back. He cannot keep it---even if he shrieks. Was this for tax year 2020 or 2021? If he did this for 2021, you are not going to be able to e-file. Your own return that claims him for 2021 will be rejected when you try to e-file and you will have to file by mail. That will mean you wait longer for you own refund since it takes the backlogged IRS much longer to process mailed returns.
To return the stimulus:
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-i-r...
And some further information for your child:
https://ttlc.intuit.com/community/dependents/help/when-do-i-have-to-answer-yes-to-being-claimed-as-a...
**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.**
