The only way to inform the IRS that you are a victim of identity theft is to report it with Form 14039. You can fax the completed form to the IRS – download with the following link:
https://www.irs.gov/pub/irs-pdf/f14039.pdf
Or
Use this online submission form: https://www.irs.gov/dmaf/form/f14039
The IRS automatically issues a PIN that is needed in the future to submit any e-file returns. This prevents unauthorized use of your social security number in e-filing your tax return.