1. Short title This Act may be cited as the Susan Muffley Act . 2. Guaranteed benefit calculation for certain plans (a) In general (1) Increase to full vested plan benefit (A) In general For purposes of determining what benefits are guaranteed under section 4022 of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1322 ) with respect to an eligible participant or beneficiary under a covered plan specified in paragraph (4) in connection with the termination of such plan, the amount of monthly benefits shall be equal to the full vested plan benefit with respect to the participant. (B) No effect on previous determinations Nothing in this Act shall be construed to change the allocation of assets and recoveries under sections 4044(a) and 4022(c) of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1344(a)