How can I check to ensure that a dependent's SSN has not been included on someone else's return prior to signing an 8332?

[xmasbaby0 · Accepted solution]

You cannot check on that.  The iRS will not tell you if anyone claimed your dependent on a tax return or who it was if it happens.  If you did not sign an 8332, and someone claimed your dependent:

Someone else claimed my dependent and my return was rejected

If someone else claimed your dependent already, then your e-filed return will be rejected.  Print, sign and mail your own return which claims your dependent.  Mailed returns are processed differently by the IRS.  It will take some time (maybe even up to a year) but eventually the IRS will contact both parties and sort out who could rightfully claim the dependent.  The person who wrongfully claimed the dependent may face repayment of refund $, plus penalties.