Are you saying that you tried to e-file your return and it was rejected because someone else already filed using your social security number? If so, then you are not filing 2 tax returns in the same year. It just means that you are not able to e-file your return. You will have to paper file your return. You will most likely get a letter from the IRS asking you to confirm your identity before the processing of your return is completed. Just be prepared that this can take longer to process. Remember the IRS is only protecting you during this process.
Tax-related identity theft occurs when someone uses your stolen personal information, including your Social Security number, to file a tax return claiming a fraudulent refund. If you suspect you are a victim of identity theft, continue to pay your taxes and file your tax return, even if you must file a paper return. Taxpayers Guide to Identity Theft
