Rev. Proc. 2024-32, page 523.

This revenue procedure updates the procedures in Rev. Proc. 2017-55 to set forth the procedure by which the sponsor of a defined benefit plan that is subject to the funding requirements of § 430 may request approval from the IRS for the use of plan-specific substitute mortality tables in accordance with § 430(h)(3)(C) and § 1.430(h)(3)-2. This revenue procedure also specifies the date by which the use of a previously approved substitute mortality table must be terminated in conjunction with the replacement of the generally applicable mortality tables specified in § 430(h)(3)(A) and § 1.430(h) (3)-1.

T.D. 10005, page 510. These regulations update the requirements that a plan sponsor of a single-employer defined benefit plan must meet to obtain IRS approval to use mortality tables specific to the plan in calculating present value for minimum funding purposes (as a substitute for the generally applicable mortality tables).