In 2006, Congress passed the Tax Relief and Health Care Act. Prior to the Act's passage, rewards to individuals who provided information to the IRS regarding tax fraud were capped at $10 million. The Tax Relief and Health Care Act authorized the IRS to create a Whistleblower Office dedicated to investigating, processing and recovering claims concerning the underpayment of taxes. Under the IRS' new program, whistleblowers may recover 15 to 30 percent of the amount collected provided the taxes and amounts in dispute exceed $2 million. If the whistleblower's claim does not meet these criteria, the IRS may still consider granting an award under its pre-2006 Tax Relief Act discretionary authority. Given the rapid growth of this program, practitioners should have a basic understanding of the procedure and content for IRS Whistleblower claims, both from the perspective of a claimant's potential to recover and a taxpayer's exposure to liability.