What is the case auto assignment rule?

A Case Assignment Rule auto-routes incoming Cases to the right user or queue based on criteria you define — region, product, severity, channel, account tier. It’s the standard Service Cloud routing layer that runs on Case create or update.

How it works

• One active Case Assignment Rule per org at a time
• Many rule entries ordered by priority
• Each entry has criteria + a destination (user or queue) + an optional email template
• The first entry whose criteria match wins

Example rule

Case Assignment Rule: "Standard Routing"

Entry 1 (order 1):
  Criteria: Case.Priority = 'High' AND Case.Account.Tier__c = 'Platinum'
  Assigned: Premium Escalation Queue
  Notification: "New Premium Case" email template

Entry 2 (order 2):
  Criteria: Case.Origin = 'Phone'
  Assigned: Phone Support Queue

Entry 3 (order 3):
  Criteria: Case.Type = 'Technical'
  Assigned: Tier 2 Tech Queue

Default (last):
  Assigned: Tier 1 Triage Queue

When the rule fires

Case Assignment Rules fire on:

• Web-to-Case form submissions
• Email-to-Case auto-created cases
• API inserts that include the AssignmentRuleHeader
• Manual creates where the user ticks “Assign using active assignment rule”
• Apex inserts that set Database.DMLOptions.assignmentRuleHeader.useDefaultRule = true

Important: assignment rules do not fire on every Case save by default — the caller has to opt in.

Queue vs User assignment

Most production setups route to queues, then layer Omni-Channel on top for skills-based assignment to individual agents.

How Omni-Channel fits in

Modern Service Cloud usually uses:

Case Created → Case Assignment Rule (routes to queue)
                    ↓
            Omni-Channel (pushes to available agent based on skills, capacity, presence)
                    ↓
              Agent works the case

The Assignment Rule does the coarse routing (which team handles this); Omni-Channel does the fine routing (which specific agent on that team takes it next).

Round-robin within a queue

The platform doesn’t natively round-robin within a queue. Options:

1. Reps pull cases from the queue manually
2. Omni-Channel with skills + capacity for true push-routing
3. AppExchange tools (Distribution Engine, LeanData) for advanced round-robin
4. Custom Flow / Apex that round-robins on the assignment trigger

Difference vs Lead Assignment Rule

Same mechanism, different object:

Common follow-ups

• Multiple active rules? — No, one active Case Assignment Rule per org.
• Why didn’t my Apex insert fire the rule? — Apex needs Database.DMLOptions.assignmentRuleHeader.useDefaultRule = true set before insert.
• Can the rule send an email to the new owner? — Yes, each rule entry can specify an email template.

Verified against: Salesforce Help — Case Assignment Rules. Last reviewed 2026-05-17 for Spring ‘26.