71 Pa.C.S. § 5505.1: Additional member contributions.

In addition to regular or joint coverage member contributions and social security integration contributions, contributions shall be made on behalf of each active member, regardless of class of service, at the rate of 1 1/4% of compensation until such time as the actuary certifies that all accrued liability contributions have been completed in accordance with the actuarial cost method provided in section 5508(b) (relating to actuarial cost method).