To change or check the Social Security number that you entered, open your tax return and go to My Info to see what number you entered. If it is correct, then keep reading for more information.
You used the words 'already claimed by someone else' which may mean that you were claimed as a dependent on someone else's tax return. If it is possible that a parent has claimed you, you should speak to them to be certain if that is the case. If it is the case, then you can still file your return but you will need to indicate that you are being claimed as a dependent in one of the questions in the My Info section.
If your error message indicated that a tax return had already been filed with your Social Security number, then that is another situation to consider.
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
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