71 Pa. C.S. § 5941
Notwithstanding any other law to the contrary, the board shall establish and serve as trustee of a retirement benefit plan within the meaning of, in conformity with and then only to the extent and so long as permitted by IRC § 415(m) for the purpose of providing such retirement benefits as would otherwise have been payable under this part to annuitants of the system on or after July 2, 2001, but for the application of the limitations on benefits of IRC § 415. The board may, in its sole discretion and within the limits of IRC § 415(m) and this section, determine all terms and provisions of the plan, including, but not limited to, the cost of and procedures for funding the plan as provided in this section. The Commonwealth and other employers whose employees are members of the system shall make contributions to the plan on behalf of all members in such amounts as shall be certified by the board.
71 Pa.C.S. § 5941