R0000-902 - Taxpayer TIN in the Return Header must not be the same as a TIN of a previously accepted electronic return for the return type and tax period indicated in the tax return. Does that mean someone is trying to use one of my dependents?

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    A duplicate ssn means that a social security number in your return is on your return twice or it has already been used on another return already filed probably by mistake. Check under personal info and make sure each ssn is only used one time. Maybe you entered one twice.   If you don't find it in your return you will have to mail your return and let the IRS sort it out and determine who is entitled to claim that ssn.  They will send you both letters.

    Someone else may have typed your number by mistake.  It's a common error.  

    See this for error 0507 Dependent's SSN can not be used twice…….
    http://turbotax.intuit.com/support/iq/Efile-status/Error-0507---The-dependent-s-social-security-number------When-Checking-E-filing-Status/SLN12029.html

    See this for error 0515 Your SSN can not be used twice…….
    http://turbotax.intuit.com/support/iq/Efile-status/Error-0515---Your-Social-Security-number-cannot-be-used-more-than-once-in-the-return----/SLN44952.html?_requestid=234550
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