The child can only be claimed on one tax return. Duplicate use of the child's SSN would result in the IRS rejecting an e-file or investigating to see which parent was the custodial parent.
The IRS will not tell you if someone else tried to claim your dependent.
If the other parent claims the child and your e-file is rejected, then you can file by mail and let the IRS sort out who can claim the child.
**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.**
