In this article, we will provide you with a detailed guide on the steps involved in writing a letter to the IRS. Send a typewritten letter to the IRS office that sent the notice.Use the format in the sample letter below. You can find the CP or LTR number on the right corner of the letter. Complete a Residency Correction Form. Sending an IRS audit reconsideration request? The Arizona transaction privilege tax (TPT) is actually a tax on a vendor for the privilege of doing business in the state. Located in the United States? If not, complete line 10. x. 10. See A.R.S. 42-11154(1) .