IRS Whistleblower Office web site
Internal Revenue Service Manual - 25.2.2 Whistleblower Awards
IRS Summary of Abusive Tax Shelters and Transactions
GAO Report "Tax Whistleblowers: Incomplete Data Hinders IRS's Ability to Manage Claim Processing Time and Enhance External Communication"
The Treasury Inspector General for Tax Administration (TIGTA)
IRS “Dirty Dozen” Tax Scams