Treatment by the Internal Revenue Service.

Prior to the Internal Revenue Service Restructuring and Reform Act of 1998 (the "1998 Act"), the Internal Revenue Service had defined a tax-protester scheme as "any scheme without basis in law or fact for the ostensible purpose of expressing dissatisfaction with the substance, form, or administration of the tax laws be either interfering with tax administration or attempting to illegally avoid or reduce tax liabilities."

The IRS has not released records indicating whom the agency defined as "illegal tax protesters" (coded as TC-148). In testimony before Congress in 1997, former IRS historian Shelley L. Davis contended that the IRS kept lists of citizens "for no reason other than that their political activities might have offended someone at the IRS " and she charged that "anyone who offers even legitimate criticism of the tax collector is  a tax protester "

After the 1997 congressional hearings, Congress responded with the 1998 Act. Subsection (a) of section 3707 of the 1998 Act now prohibits "officers and employees of the Internal Revenue Service" from designating a taxpayer as an "illegal tax protester" or using any similar designation for a taxpayer. By contrast, subsection (b) of section 3707 provides: "An officer or employee of the Internal Revenue Service may designate any appropriate taxpayer as a nonfiler, but shall remove such designation once the taxpayer has filed income tax returns for 2 consecutive taxable years and paid all taxes shown on such returns."

The IRS has prescribed procedures for its personnel to handle frivolous returns (whether considered valid returns or not) in the "Frivolous Return Program" section of the Internal Revenue Manual. The IRS has concluded, in Service Center Advice 200107034 dated November 15, 2000, that the statutory prohibition on the use of the term "illegal tax protester" by IRS personnel does not prohibit the IRS from maintaining a database of frivolous tax return filers as part of its Frivolous Return Program. IRS Advice 200107034 states (in part).