If your tax return was rejected because someone else claimed your dependent, you cannot fix this right away because the IRS system already has the dependent’s information.
First, I suggest you ...
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If your tax return was rejected because someone else claimed your dependent, you cannot fix this right away because the IRS system already has the dependent’s information.
First, I suggest you make sure your dependent meets all the IRS criteria to be claimed by you. These include: Relationship (Be your son, daughter, or other). Age (be under 19 or under 24 if a full-time student). Residency (If they live with you for more than half the year), support (Get more than half their financial support from you).
Open here General rules for dependents to see more IRS qualifications.
If you are sure you are the one entitled to claim the dependent, you will need to file your return by mail.
Sign in to your TurboTax account, go to the My Info section, select Edit next to the dependent, and make sure their Social Security Number is correct.
Proceed to the File section. When asked how you want to file, select File by Mail instead of E-file.
Print, sign, and mail your tax return. You must also attach your documents, such as W-2s, 1099s, and any other documents.
Open the link below, to see more details.
How do I fix e-file reject IND-507-01?
Also, see the following link to learn how to handle when someone else claims your dependent:
What if somebody already claimed my dependent?