Hello, when I try to finalize my tax return, it denied me because it said someone with a duplicate Social Security number had already filed

[AnnetteB6 · Accepted solution]

First, double check to be sure you entered the right number.  Typographical errors can happen sometimes.  

Then, if you are married, be sure that your spouse has not already filed a joint return including your information.  

If neither of the above situations applies to you, you may be a victim of identity theft.  Take a look at the TurboTax article below for some advice about what to do next.  There is also a link for further information from the IRS.

Identity Theft: What to Do if Someone Has Already Filed Taxes Using Your Social Security Number

When to file an Identity Theft Affidavit