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- Sixteenth Amendment--Income Tax ] SIXTEENTH AMENDMENT __________ INCOME TAX __________ CONTENTS Page Income Tax................................................ 1953 History and Purpose of the Amendment...................... 1953 Income Subject to Taxation................................ 1954 Corporate Dividends: When Taxable................. 1955 Corporate Earnings: When Taxable..................www.access.gpo.gov/congress/senate/constitution/amdt16.html