40 ILCS 5/17-134.2
Any educational staff of a contract school operating pursuant to an agreement with the Board of Education who is employed in a position requiring certification or licensure under the School Code on or after the effective date of this amendatory Act of the 102nd General Assembly (excluding all managerial, supervisory, and confidential employees) shall participate as a member beginning on January 1, 2022, unless the person began employment with the contract school before the effective date of this amendatory Act of the 102nd General Assembly.
Any educational staff employed in a contract school operating pursuant to an agreement with the Board of Education who began employment in a position requiring certification or licensure under the School Code before the effective date of this amendatory Act of the 102nd General Assembly (excluding all managerial, supervisory, and confidential employees) may irrevocably elect, in a manner prescribed by the Board, to participate as a member for service accrued after January 1, 2022 with the contract school, another contract school, a charter school, or the Board of Education. In no event shall a person accrue service for employment with a contract school that occurred before January 1, 2022.
40 ILCS 5/17-134.2