In Dupont v. Dupont (2001) 88 Cal.App.4th 192, the arrearage judgment required the obligor to pay the County a monthly amount and did not address postjudgment interest. The court assumed the arrearage total included interest as of the date of judgment because there was no evidence that it reflected principal only. (Id. at p. 201.) The court concluded that the arrearage money judgment was payable in installments and thus fell squarely under subdivision (b) of section 685.020. Because the judgment did not otherwise provide for a different rate of interest accrual, it was an installment judgment that was subject to accruing interest as to each installment as each became due. (Ibid.)