If you put your child's W-2 income on your own tax return that was a mistake. You are not supposed to do that. If you did that, you need to amend your own incorrect tax return and remove that income that your son earned.
Your Form 1040 does not show individual W-2's, but the worksheets that are part of the pdf will show the W-2's you entered. So print out the worksheets and look to see if you put your son's W-2 on your return by mistake.
If your son had a W-2 that showed tax withheld in boxes 2 or 17 then he could have filed his OWN tax return to seek a tax refund. On that return he would have to say that he can be claimed as someone else's dependent. He can still do that, in fact, but he cannot use the online program now. You could get the paper forms and complete them by hand to mail in.
2019
2019 Instructions
https://www.irs.gov/pub/irs-prior/i1040gi--2019.pdf
1040 https://www.irs.gov/pub/irs-prior/f1040--2019.pdf
1040SR https://www.irs.gov/pub/irs-prior/f1040s--2019.pdf
2019 Schedules 1-3
https://www.irs.gov/pub/irs-prior/f1040s1--2019.pdf
https://www.irs.gov/pub/irs-prior/f1040s2--2019.pdf
https://www.irs.gov/pub/irs-prior/f1040s3--2019.pdf
**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.**
