26 U.S.C. § 4999 Golden parachute payments
(a) Imposition of taxThere is hereby imposed on any person who receives an excess parachute payment a tax equal to 20 percent of the amount of such payment.
(b) Excess parachute payment definedFor purposes of this section, the term “excess parachute payment” has the meaning given to such term by section 280G(b).
(c) Administrative provisions(1) WithholdingIn the case of any excess parachute payment which is wages (within the meaning of section 3401) the amount deducted and withheld under section 3402 shall be increased by the amount of the tax imposed by this section on such payment. (2) Other administrative provisionsFor purposes of subtitle F, any tax imposed by this section shall be treated as a tax imposed by subtitle A.