Cal. Const. art. IV, § 4.5

Notwithstanding any other provision of this Constitution or existing law, a person elected to or serving in the Legislature on or after November 1, 1990, shall participate in the Federal Social Security (Retirement, Disability, Health Insurance) Program and the State shall pay only the employer’s share of the contribution necessary to such participation. No other pension or retirement benefit shall accrue as a result of service in the Legislature, such service not being intended as a career occupation. This Section shall not be construed to abrogate or diminish any vested pension or retirement benefit which may have accrued under an existing law to a person holding or having held office in the Legislature, but upon adoption of this Act no further entitlement to nor vesting in any existing program shall accrue to any such person, other than Social Security to the extent herein provided.