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What Is California Labor Code §5405: the One-Year Filing Deadline?
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By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization · Cal Bar #285231
The period within which proceedings may be commenced for the collection of the benefits provided by Article 2 (commencing with Section 4600) or Article 3 (commencing with Section 4650), or both, of Chapter 2 of Part 2 is one year from any of the following: (a) The date of injury. (b) The expiration of any period covered by payment under Article 3 (commencing with Section 4650) of Chapter 2 of Part 2. (c) The last date on which any benefits provided for in Article 2 (commencing with Section 4600) of Chapter 2 of Part 2 were furnished.
What does California Labor Code 5405 do?
Labor Code 5405 is the main one-year filing rule for starting a California workers' compensation case at the WCAB.
Labor Code 5405 matters because reporting an injury is not always enough. A worker may tell a supervisor, get clinic care, and still need to file an Application for Adjudication with the Workers' Compensation Appeals Board. This statute sets the outside time for that filing in many claims.
The rule is short, but the date can be disputed. For a sudden accident, the safest calendar date is usually one year from the injury. For a claim with medical treatment or disability payments, the statute also looks at the last benefit furnished. For a slow-developing injury, a separate discovery rule may affect when the worker knew the condition was work related.
That is why the first review is factual. A lawyer looks for the DWC-1 claim form, benefit notices, clinic bills, wage-loss checks, and any doctor note that connects the condition to work. Eman Yazdchi is a Certified Specialist in workers' compensation law, certified by the California Board of Legal Specialization, State Bar of California.
When does the one-year clock start?
The safest start date is the injury date, but payments and medical benefits can give the worker a later date under the statute.
For a single accident, use the accident date unless a later statutory trigger clearly applies. If the insurer paid temporary disability, the period covered by those payments can matter. If the insurer furnished medical care, the last date of that care can matter too.
Do not rely on memory. Save appointment records, pharmacy records, benefit check stubs, denial letters, and mileage forms. A one-day difference can decide whether the case survives.
What can extend or change the deadline?
Employer notice problems, benefit payments, medical care, and delayed discovery can all become deadline evidence.
Labor Code 5405 should be read with the claim-form rule in Labor Code 5401 and the injury-date rules for cumulative trauma. If the employer knew about the injury but did not give the DWC-1 form, that failure can become part of the filing-deadline analysis. If the worker kept receiving authorized care, the last care date may be the key fact.
Cumulative trauma claims need extra care. A warehouse worker's back, a nurse's shoulder, or a mechanic's hands may worsen over months. The useful date may be when a doctor first tied the condition to job duties, not the first day the worker felt pain.
How is Labor Code 5405 different from notice to the employer?
Notice tells the employer about the injury. Labor Code 5405 concerns the formal WCAB case filing.
California has more than one clock. Notice to the employer, claim-form service, insurer acceptance or denial, and the WCAB filing are separate steps. A worker can satisfy one step and still have trouble with another.
The practical fix is simple: report the injury, request and return the DWC-1, get medical care, and file the WCAB application before the earliest possible deadline. If the insurer later argues late filing, the record is already protected.
How does this rule affect death claims or reopened claims?
Related claims can have different deadlines, so do not assume the original injury clock answers every later issue.
A dependent's death-benefit claim and a petition to reopen for new and further disability use different legal rules. Labor Code 5405 is about starting the original proceeding for benefits. A later worsening after an award may involve Labor Code 5410. A death claim may need its own timing review.
Bring every award, settlement paper, death certificate, medical report, and proof of service to the deadline review. The first question is not whether the case is strong. It is whether the WCAB still has power to hear it.
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Does Labor Code 5405 mean I only have one year to report an injury?
No. Reporting the injury and filing a WCAB case are different steps. Labor Code 5405 deals with starting proceedings for benefits. A worker should still report the injury right away, return the DWC-1 claim form, and file the WCAB application before the earliest possible deadline.
Can medical treatment extend the Labor Code 5405 deadline?
It can. The statute includes the last date medical benefits were furnished as one possible trigger. The details matter. The worker should save appointment records, billing records, authorization letters, and pharmacy records so the exact last benefit date can be proved.
What if I have a cumulative trauma injury?
A cumulative trauma injury often needs a discovery-date review. The key issue may be when the worker knew, or reasonably should have known, that work caused the condition. Doctor notes tying the condition to job duties are often the most important evidence.
What if my employer never gave me a DWC-1 form?
That fact can matter. California employers must provide the claim form after learning of an injury. If the employer failed to do that, the worker should still file promptly, but the failure may help answer a late-filing defense.
What records should I bring for a Labor Code 5405 review?
Bring the DWC-1 form, denial letters, benefit notices, wage-loss checks, medical records, appointment lists, prescriptions, and any proof of when you first learned the injury was work related. The deadline analysis is document driven.
Last reviewed by Eman Yazdchi, Esq., July 2026.
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