The amendments made by this section shall apply to distributions made after the date of the enactment of this Act. 305. Deferral agreements (a) In general Paragraph (4) of section 457(b) of the Internal Revenue Code of 1986 is amended by inserting , or, in the case of a plan of an eligible employer described in subsection (e)(1)(A), before the date on which the compensation is (but for the deferral) available before the comma at the end. (b) Effective date The amendment made by this section shall apply to years beginning after December 31, 2018. 306. Simplifying 402 (f) notices Not later than December 31, 2018, the Secretary of the Treasury, in consultation with the Secretary of Labor and the Director of the Pension Benefit Guaranty Corporation, shall simplify the model notices issued under section 402(f) of the Internal Revenue Code of 1986 so as to facilitate better understanding by recipients of different distribution options and corresponding tax consequences. Such model notices shall include an explanation of the effect of elections on spousal rights. 307. Guidance related to certain overpayment recoupment practices (a) Overpayments under Internal Revenue Code of 1986 Not later than December 31, 2018, the Secretary of the Treasury shall further modify the Employee Plans Compliance Resolution System (as described in Revenue Procedure 2018–52 or any successor guidance, and modified by section 118 of this Act)— (1) to clarify that in no case shall any person be required to seek recoupment of an inadvertent overpayment (as defined in such System) from a participant or beneficiary