How can I find out who else claimed my child as a dependent?
Contact the IRS. If you believe that you're the person who should claim your child, go ahead and do so. If someone else has already filed and claimed your child, the IRS will reject your e-filed return. You should instead file a paper return, claiming your child.
The IRS will follow up to resolve the dependency issue. Keep any documents proving you were entitled to claim the dependent for the year.
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This advice is for general information purposes only and may not apply to you. Every tax situation is different. This is not intended to be legal advice. Taxpayers should consult an H&R Block Tax Professional regarding their individual tax situation.