In this article, we will provide you with a detailed guide on the steps involved in writing a letter to the IRS. You may fill out the change of address form or simply make the request in writing.Let the IRS know of a disputed notice. Send a typewritten letter to the IRS office that sent the notice. Use the format in the sample letter below. To register with Bexar County, verify your eligibility. Sending an IRS audit reconsideration request? Most letters from the IRS contain specific instructions to help complete your tax return. 7 New business location (no. , street, room or suite no.