Cal. Sts. & High. Code § 8782

The legislative body may provide in its order levying the supplemental assessment that the supplemental assessments may be collected in annual installments during the remaining term of years during which the bonds run, an equal proportion of principal coming due in each of the remaining years. However, any property owner may pay the whole of the supplemental assessment subsequent to the order of the legislative body and before the amount has been extended on the tax roll, whereupon interest shall cease on such assessment.