Proof interest expenses were incurred in the taxable year. If you get a letter from the IRS that you feel might involve fraud, contact the IRS Identity Protection Specialized Unit at 800-908-4490.Learn what an IRS audit letter looks like and how to effectively respond to address any tax issues. Expert guidance on handling IRS correspondence. During the examination, I will review the information you provide. My goal is to complete your examination at the initial meeting. However,. You can find the CP or LTR number on the right corner of the letter. Locate the closest Taxpayer Assistance Center to you. In this article, we will provide you with a detailed guide on the steps involved in writing a letter to the IRS.