Cal. Fam. Code § 3603 : CALIFORNIA FAMILY CODE — SUPPORT — DEFINITIONS AND GENERAL PROVISIONS — SPOUSAL AND CHILD SUPPORT DURING PENDENCY OF PROCEEDING — Modification or termination of order

An order made pursuant to this chapter may be modified or terminated at any time except as to an amount that accrued before the date of the filing of the notice of motion or order to show cause to modify or terminate.