California Code, Public Utilities Code - PUC § 150208

(a) A ballot proposition to approve an ordinance for the imposition of a retail transactions and use tax, shall seek authorization to issue bonds payable from the proceeds of the tax and establish the appropriations limit of the authority.

(b) The maximum bonded indebtedness which may be outstanding at any one time shall be an amount equal to the sum of the principal of, and interest on, the bonds, but not to exceed the estimated proceeds of the tax for a period of not more than the number of years for which the tax authorized by this chapter is to be imposed.