Example audit letters from the IRS and state taxing agencies. During the audit process, a letter is sent requesting information, or clarification.Most letters request a response within 30 days from date of the letter. If you agree with the notice, fill out, sign and mail the response form to the IRS. Sending an IRS audit reconsideration request? Arizona tax audit attorney Shad M. Brown explains what to do. Don't be alarmed if you've received a letter from the IRS. Not every letter means an audit. If you've received an audit notice from the IRS, please fill out the form on the bottom of this page to receive a Free Consultation with our tax specialist. There may be other more appropriate forms specific to your complaint.