Cal. Gov. Code § 53715

As used in Article XIIIB of the California Constitution, the term “proceeds of taxes” does not include the proceeds from the sale of bonds, notes, warrants or other obligations required for the purpose of financing or refinancing the acquisition, construction, or completion of public improvements or projects or any rents, charges, assessments, or levies, other than tax levies, made pursuant to law, the proceeds of which are required for the payment of principal and interest, or to otherwise secure such obligations, and to pay the costs and expenses associated therewith.