Cal. Revenue and Taxation Code § 2270

A local agency may levy, or have levied on its behalf, a rate in addition to the maximum property tax rate established pursuant to this chapter (commencing with Section 2201) to pay the cost of: (1) interest and redemption charges on bonded or other indebtedness authorized prior to the effective date of this section, together with any reserve or sinking funds required in connection therewith; (2) interest and redemption charges on bonded or other indebtedness authorized after the effective date of this section by the voters of such agency, together with any reserve or sinking funds required in connection therewith; (3) interest charges on notes of a local agency issued in anticipation of bonds, if such bonds were authorized prior to the effective date of this section or were authorized by the voters of such agency after the effective date of this section, and if the principal amount of any such notes is payable only from proceeds of the sale of such bonds; (4) interest and redemption charges on refunding bonds or on bonds issued pursuant to Section 53541 of the Government Code or Section 71960 of the Water Code, together with any reserve or sinking funds required in connection therewith; (5) retirement and pension benefits or plans which are being provided pursuant to provisions of a city or county charter or which have been specifically approved by the voters of a local agency; and (6) payments or contributions which are required to be made to a special fund by specific provision of a city or county charter; provided, however, that this subdivision shall not apply to any city or county whose charter contains a provision permitting the governing body to suspend or defer such payments or contributions upon making a finding that statutory limitations on ad valorem property taxation limit the ability of the city or county to make such payments or contributions.