§ 410.50.Jurisdiction From Time Summons Served; General Appearance Equivalent to Personal Service; Continued Jurisdiction

Section 410.50 marks the moment a California court’s power over a defendant attaches. Subdivision (a) provides that, except as otherwise provided by statute, the court gains jurisdiction over a party from the time summons is served as provided by Chapter 4 of this Title (§ 413.10 and following). A general appearance by the party is treated as equivalent to personal service of summons, so a defendant who appears in the action without being served is nonetheless subject to the court’s jurisdiction from that point.

Subdivision (b) makes that jurisdiction durable. Once the court has jurisdiction over the parties and the subject matter, that jurisdiction continues throughout all subsequent proceedings in the action — through amended pleadings, added claims, and post-judgment matters — without needing to be re-established at each stage.

This section is the hinge between the mechanics of service in Chapter 4 and the substantive jurisdictional grant in § 410.10. Section 410.10 defines how far California’s jurisdiction can reach; § 410.50 defines the specific moment that jurisdiction takes hold over a given defendant in a given case.