This site matches the common notices — CP2000, CP14, the CP500-series, the Notice of Deficiency, LT11 levy and lien notices, identity checks and audits — to a clear, copy-paste response letter, the right IRS form (843, 9465, 12153…), and what to attach.
Every letter is a starting template. The notice number, deadline, and form come from your own notice, and rules change. Nothing here is legal or tax advice, this site is not affiliated with or endorsed by the IRS, and using a template creates no professional relationship. For help, call the number on your notice or see the Taxpayer Advocate Service and Low Income Taxpayer Clinics.