California Code, Streets and Highways Code - SHC § 5628.1

The legislative body shall have the power, in its discretion, to determine that the payment of assessments of one hundred dollars ($100) or more may be made in annual installments, not to exceed five, and that the payment of assessments so deferred shall bear interest on the unpaid balance at a rate to be determined by the legislative body, not to exceed the rate permitted for bonds by Section 53531 of the Government Code. Interest shall begin to run on the 31st day after the confirmation of the assessments by the legislative body.Determinations of the legislative body shall be expressed by resolution at any time prior to the confirmation of the assessments.