What this notice is about We're verifying your income, income tax withholding, tax credits and/or business income. If you filed a return You don't need to take any action. Please do not call us until 60 days after the notice date and only if you haven't received your refund or heard from us by then. If you didn't file a return Someone else may have used your personal information to file this return. Please complete and sign Form 14039, Identity Theft AffidavitPDF, and mail it to us along with the requested documents. You can find this form online at www.irs.gov. You can also refer to the IRS Identity Theft resource page for more information. Frequently asked questions Why is my return being reviewed? We select some returns to examine so we can determine whether income, expenses, and credits are reported correctly. This doesn't mean you made an error or were dishonest. Helpful information The IRS Identity Protection PIN can help prevent misuse of your taxpayer identification number on fraudulent federal income tax returns. Learn more at IRS.gov/ippin. Publication 3498-A, The Examination ProcessPDF Herramientas de referencia Publicación 1(SP), Derechos del Contribuyente Publicación 17(SP), El Impuesto Federal sobre los Ingresos Lista completa de formularios e instrucciones contributivos, en inglés ¿Necesita ayuda? Puede autorizar a alguien para comunicarse con el IRS en su nombre. Vea si califica para recibir ayuda de una Clínicas para Contribuyentes de Bajos Ingresos . Si no puede encontrar lo que necesita en línea, llame al número del IRS que se indica en la parte superior de su carta o aviso.