Section 72 covers the taxation of annuities, certain proceeds of endowment, life insurance contracts and other issues related to distributions from retirement vehicles. The section does not include any anything related to the reduction of social security taxes.
http://www.taxalmanac.org/index.php/Sec._72._Annuities%3B_certain_proceeds_of_endowment_and_life_insurance_contracts#Statute
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