Let the IRS know of a disputed notice. Sample Letter to the IRS.Send a typewritten letter to the IRS office that sent the notice. Use the format in the sample letter below. How do I fill this out? To fill out this form, you need to provide the old and new company names, your federal identification number, and contact details. Account Number: Tax Year: Instructions. This document provides a template for churches to notify the IRS of a name change. It includes guidance on how to complete and submit the letter. Account Number: Tax Year: Instructions.