High Quality Content by WIKIPEDIA articles! Tax protester constitutional arguments are assertions that the imposition of the federal income tax violates the United States Constitution. These kinds of tax protester arguments are distinguished from related statutory arguments and conspiracy arguments, which presuppose the constitutionality of the income tax. Although the most frequent Constitutional arguments are directed towards the validity and effect of the Sixteenth Amendment, arguments exist that the income tax violates some other provision of the Constitution; or that some other provision, that would prevent the assessment of the income tax, was ratified but wrongfully excluded from the Constitution.