First, you must determine if you qualify as a dependent on that person's return. For tax purposes, a dependent is someone “other than the taxpayer or spouse” who qualifies to be claimed by someone else on a tax return. More generally speaking, a dependent relies on another person for financial support, such as housing, food, clothing, necessities, and more. Typically, this includes your children or other relatives, but it can also include people who aren’t directly related to you, such as a domestic partner.
If you are considered a dependent, you can still file your return, but it will indicate you were claimed as a dependent on someone else's return.
If you are not a dependent and should not have been claimed on the return, you can still file your return but will need to mail the return to the IRS. The IRS will process the return, and you and the other filler will receive a notice requesting documentation on why you are allowed to be claimed as a dependent or not.
If you feel the return filed was a form of identity theft, you will want to include the Identity Theft Affidavit, Form 14039, as suggested by Mike9241.
For more information, see the link below:
Rules for claiming a dependent
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