You can find the CP or LTR number on the right corner of the letter. In this article, we will provide you with a detailed guide on the steps involved in writing a letter to the IRS.Does anyone have sample letters to the IRS for different situations? Maybe one with code numbers and explainations. Household members who do not file a Federal Tax Return: They will need to obtain a written "Verification of NonFiling" letter from the IRS by. Steps in the grant-seeking process. How to draft a proposal. An Information Letter provides general statements of well-defined law without applying them to a specific set of facts. The following is a list of interactive forms. These forms should be downloaded and completed on your device and printed.