Tax Professional Training and Communication Tools IRS Pronouncements Internal Revenue Bulletins The Internal Revenue Bulletin (IRB) is the authoritative instrument of the IRS for announcing all substantive ruling necessary to promote a uniform application of tax law. Internal Revenue Code Procedures, Regs, Rulings FAQs Tax Code, Treasury Regulations, and Other Official Guidance A one-stop spot for researching publicly available versions of the Internal Revenue Code (IRC), Treasury (Federal tax) Regulations, or other types of official IRS guidance published in the Internal Revenue Bulletin (IRB). Also included is a link to the list of proposed regulations and treasury decisions issued since 1995, with plain language summaries and a method for commenting on proposed regulations still open for public comment. Tax Law Issues, Nibbles & Bytes Here's the beef! We've linked to all of the most technical references on our site and will add new items as soon as available. Check out our Advance Notices for Tax Professional. State Law Guides Federal and State Court Opinions Government Sites Freedom of Information Act (FOIA) Guidance for requesting or electronically accessing information made available to the public pursuant to FOIA. Practitioner Priority Service866-860-4259 Centralized Authorization File (CAF) A computerized system of records which houses authorization information from: Powers of Attorney (POA); Tax Information Authorizations (TIA), and Estate Tax Returns. Contact the Return Preparer Program Names, numbers, lists and other information that will help you work with IRS more effectively.