If someone fraudulently filed a tax return, then you have to report it to the IRS. This is illegal, and a person can be criminally charged for it. No one is allowed to file a tax return for someone else without their consent. However, since this was 11 years ago, as to whether or not something would be done is unknown since you have known about it for many years and did not report it to the IRS.
Report a tax scam or fraud
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