When does a California layoff require Cal-WARN notice?
September 20, 2026
At a site with 75 or more employees, laying off 50 in 30 days, closing or moving 100 miles takes 60 days' notice. Since 2026 the notice must say more.
By McKinley Malbrough III, J.D., MS-HRM
Published November 4, 2026.

Short answer
Using AI alone does not trigger a new notice. But when a covered Cal-WARN layoff is caused in whole or substantial part by AI or automation, the 60-day notice must add the number, classification and location of affected workers, the job functions automated, the type of technology, and the header “This notice is for a technology displacement.”
Using artificial intelligence at work does not, by itself, create a new notice duty in California. But when a layoff that already requires a Cal-WARN notice is caused in whole or in substantial part by AI or automation, the notice has to say so, and it has to say it in a specific way. SB 951 adds those requirements to the Labor Code, and the new rules take effect January 1, 2027. This guide covers what the notice must contain, what employees should check when they receive one, and how HR can draft it.
I am Mac Malbrough. I hold a J.D. and an MS-HRM, I am not an attorney, and this is general information, not legal advice. I read SB 951, Chapter 860 of the Statutes of 2026, on the California Legislative Information site on November 4, 2026. For a specific layoff, an employment attorney should review the facts and the notice itself.
SB 951 amends Labor Code Sections 1400.5 and 1401, which are part of the California Worker Adjustment and Retraining Notification Act, usually called Cal-WARN. It does not create a separate AI layoff notice. It adds required content to the notice an employer already has to give. If a covered event is not caused in whole or in substantial part by AI or automation, the notice is the same notice employers send today. My guide to California WARN and layoffs covers who is covered and when the 60 days start.

The bill also asks the Employment Development Department to report to the Legislature by January 1, 2028, including recommendations on whether employers should give notice about “technological cessation in hiring,” meaning a decision to stop hiring because technology does the work. That is a recommendation, not a requirement. Nothing in the text I read creates a duty for an employer that quietly stops backfilling roles.
It applies when an employer gives a Cal-WARN notice for a covered event and the event is caused in whole or in substantial part by the employer’s use of artificial intelligence or other automating technology. The words that decide it are “substantial part.” The bill does not define them. In my reading, that leaves employers with a judgment call and no safe harbor, and it leaves workers with a question to ask directly.
For an employer, the practical approach is to ask this before every covered layoff: did a tool or automation change the work so that these roles are no longer needed? If the honest answer is yes or partly, the added content belongs in the notice. Leaving it out invites a fight about whether the cause was “substantial.” My piece on the cost of AI layoffs and rehiring explains why the decision deserves more than a quick call.
The standard notice contents stay. The employer still gives 60 days’ notice to affected employees, the Employment Development Department, the local workforce development board and the chief elected official of each affected city and county. It still includes the elements the statute already requires, such as the statement about services for dislocated workers, the CalFresh information and a contact email and telephone number.
For a technology displacement, the bill adds four items:
The header is the easiest requirement to check and the easiest to miss. The statute calls for it at the top, so it should not sit in paragraph six.
The bill directs EDD to publish a summary of each technology displacement notice it receives, and a quarterly statewide summary of those notices. For an employer, that means the information in the notice becomes public in some form. Write it with that audience in mind.

SB 951 does not change the thresholds that decide whether Cal-WARN applies. A small layoff may not require a notice, with or without AI involved. The existing law covers a mass layoff, relocation or termination at a covered establishment, and an employer with questions about whether its facts meet the definitions should have an employment attorney confirm before choosing not to send one. The statute keeps its existing exception for a physical calamity or an act of war.
If you receive a layoff notice that mentions technology, automation or AI, use this checklist before you do anything else:
Then ask in writing about severance, accrued paid time off and health coverage, and about any rehire or recall process. Do not sign a release before you understand what you are giving up. The steps in my guide to the first 48 hours after a layoff work the same way when software was involved. If the facts suggest your layoff was a cover for something else, such as retaliation or discrimination, that is a matter for an employment attorney, not for HR.
If your handbook or layoff procedure does not mention the new content, add it. My California employee handbook template is $149 and includes layoff and separation language you can adapt.
A layoff notice is read by the people losing work, by state agencies and, now, by anyone who reads EDD’s summaries. An overstated notice tells the public your business replaced people with software when it did not. An understated one invites the question of why a tool rollout and a layoff landed in the same quarter. Either way, the safest notice is the one that matches the internal record: who decided, when, and on what evidence. That is also why the first item in the drafting checklist is a written cause. Employers that write the decision down first rarely struggle with the notice that follows.
For workers, the same logic runs the other way. A specific notice gives you something to compare with what you were told in meetings, emails and performance conversations. If the story changes between those documents, keep copies of all of them.
If you are an employee, keep every message about your role, any tool rollout you were told about and your performance before the notice. If you are an employer, list the tools that have changed how work is done in the last year, and mark any role where headcount might change. If a 2027 layoff is possible, run your notice template against the checklist above now. The HR compliance check-up is built for that review, and the free live sessions include a quarterly California law update.
For the steps around the notice, see a California offboarding checklist.
McKinley holds a J.D. but is not a licensed attorney. Articles here are general information, not legal advice. For your specific situation, talk with an employment attorney.
Data current as of November 2026. Sources are linked where each figure appears.
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This article is general information, not legal advice. Laws change and every situation is different; for advice on yours, talk with an employment attorney.
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