An abusive scheme toolkit for external stakeholdersTable of contentsIntroductionFactsLaw and arguments - The voluntary nature of the federal income tax systemThe meaning of income: taxable income and gross incomeThe meaning of certain terms used in the Internal Revenue CodeConstitutional amendment claimsFictional legal basesThe truth about frivolous tax argumentsTalking pointsQuestions and answersReferrals/contactsReport tax fraud, a scam or law violation