Problem: The IRS - not eFile.com - rejected your Federal Tax Return because your spouse's SSN has been used as the Spouse SSN on another previously e-Filed federal return for the same tax year with the IRS.
Solution: Sign into your eFile.com account: https://mytaxes.efile.com/1040/signin, click Name and Address information and enter verify your spouse's SSN. If the number is correct, did you or somebody else already file a return with your SSN? If the number is not correct, corrected it continue with your re-eFile process. You can re-eFile your return at no additional charge. If you are certain that your spouse's SSN is correct and that you or your spouse did not eFile another return with the same SSN you might have to mail in your return.
In some cases the IRS rejects incorrectly. In that case go to "My Account" in eFile.com and download, sign, print paper file your return via mail or call the IRS: 1-800-829-1040.
Contact us with questions: https://www.efile.com/tax-service/contact/efile-contact/