PSA from the Federal Trade Commission:
The Federal Trade Commission has a new tool for victims of identity theft. Now, people can report tax-related identity theft directly to the IRS online at IdentityTheft.gov.
Tax-related identity theft happens when someone steals your Social Security number, files a tax return, and claims your refund. You might find out about it when you try to e-file — and learn that someone already submitted a return — or when the IRS sends you a letter saying it received a suspicious tax return with your Social Security number. If that happens, you need to file an IRS Identity Theft Affidavit, which you can do at IdentityTheft.gov.