Example. Information provided to the IRS by a whistleblower, under section 7623 and § 301.7623-1 , identifies a corporate taxpayer (Corporation), describes and documents specific facts relating to Corporation's activities, and, based on those facts, alleges that Corporation owed additional taxes. Based on the information provided by the whistleblower, the IRS proceeds with an examination of Corporation and determines adjustments that would result in an unpaid tax liability of $500,000. During the examination, Corporation informally claims a refund of $400,000 based on adjustments to items of income and expense that are wholly unrelated to the information provided by the whistleblower. The IRS agrees to the unrelated adjustments. The IRS nets the adjustments and determines a tax deficiency of $100,000. Thereafter, Corporation makes full payment of the $100,000 deficiency. For purposes of section 7623 and §§ 301.7623-1 through 301.7623-4 , the collected proceeds include the $400,000 informally claimed as a refund and netted against the adjustments attributable to the information provided, as well as the $100,000 paid by Corporation.
26 C.F.R. §301.7623-2