Problem: The IRS—not eFile.com—rejected your Federal Income Tax Return because your SSN is already on another Tax Return and that return has been accepted by the IRS.
Solution: Let us help you turn this into an IRS acceptance. Please sign into your eFile.com account and click Name and Address on the left side menu in your account, and correct the SSN on that screen. Click the green "Save" button at the bottom to save your changes.
If you entered your SSN correctly, please PRINT your return from your account, sign it, and MAIL it to the IRS. See printing and mailing instructions plus addresses based on your resident state. You may need to print, sign, and mail your State Tax Return to the State Tax Agency. After that, contact the IRS at 1-800-829-1040 and discuss your tax return in more detail.
Contact us with questions: https://www.efile.com/tax-service/contact/efile-contact/