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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 require, and when does the one-year clock start?
Section 5405 sets a one-year filing deadline starting on the date of injury, missing it without a recognized exception usually ends the claim entirely.
Section 5405 is the one-year filing deadline, the clock starts on the date of injury and runs until the Application for Adjudication is filed at the WCAB. Missing it is usually fatal, but it extends when the employer failed to provide the claim form, failed to post the required notice, or paid any benefit. Certified Specialist Eman Yazdchi (California Board of Legal Specialization, State Bar of California) calendars section 5405 deadlines on every file.
Under California Labor Code §5405, a California injured worker generally has one year from the date of injury to file the application for adjudication of claim with the WCAB. For a specific injury, the clock starts on the date of the accident; for a cumulative-trauma injury under California Labor Code §3208.1, California's specific-versus-cumulative injury definition, the clock starts on the date the worker knew or should have known the condition was work-related.
What are the recognized California exceptions to the §5405 one-year deadline?
The filing deadline extends when the employer failed to provide the claim form, failed to post the required notice, or voluntarily paid any benefit during the year.
California Labor Code §5405 can be extended in several recognized circumstances: when the employer failed to provide the DWC-1 claim form within one working day of learning of the injury under California Labor Code §5401; when the employer failed to post the required workers' compensation notice at the workplace; when the worker received any compensation (medical care paid by the insurer, indemnity payments, or wage continuation) within the one-year window; or when the worker was a minor without a guardian ad litem. Each exception independently extends the California statute of limitations.
How does §5405 work for a cumulative-trauma California workers' compensation claim?
For cumulative trauma, the section 5405 clock starts at the section 5412 discovery date, the date the worker knew the condition was caused by work.
For a cumulative-trauma injury under California Labor Code §3208.1, the §5405 one-year clock starts on the date of medical-occupational discovery, the date the California worker knew or should have known the condition was work-related. A warehouse worker whose back pain develops over years of lifting or a construction worker whose knees fail after a decade of crawling face cumulative-trauma deadlines that start at the date a doctor first attributes the injury to the job, not at the first day of symptoms.
How does §5405 interact with the §5410 five-year reopening window?
Section 5405 interacts with the section 5410 five-year reopening window: the reopening deadline is five years from injury date, not five years from the original filing.
California Labor Code §5405 is the deadline to file the original claim. California Labor Code §5410 is the separate five-year window within which a California injured worker may petition to reopen the claim for new and further disability, a worsening of the same industrial injury, after a permanent disability award has been entered. The two clocks run on different events. Missing §5405 forfeits the original claim; California Labor Code §5410 only applies after a claim has been adjudicated.
What about a death benefits claim, does §5405 apply the same way?
Death-benefit claims under the related statute have a one-year deadline from the date of death or the date the dependent knew work caused the death.
California Labor Code §5405 sets the one-year filing deadline for an indemnity claim. A separate one-year deadline applies to dependents seeking death benefits, measured from the date of death rather than the date of injury, when death results from an industrial injury or occupational disease. The death-benefit clock is independent of the underlying §5405 clock, so a dependent may have a timely death-benefit claim even when the original §5405 clock ran.
The DIR's 2025 Workers' Compensation indicators put California's average permanent-disability rating at 24% across all closed indemnity claims (CHSWC 2024 Closed-Claim Study), with about 7% of cases reaching the 70%+ band that triggers life-pension entitlement under California Labor Code §4659.
Related reading: California pillar guide · §5410 explainer.
Related on yazdchilaw.com: California workers' compensation lawyer pillar · California Labor Code §5400.30 explained · California Labor Code §3700.6 explained · what to do if you can't go back to work after a workers' comp injury.
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Tap to call →Frequently Asked Questions
When does the California §5405 one-year clock actually start?
Under California Labor Code §5405, the one-year California statute of limitations starts on the date of injury for a specific traumatic injury, the date of the accident. For a cumulative-trauma injury under California Labor Code §3208.1, the clock starts on the date the worker knew or should have known the condition was work-related, typically the date a treating physician first attributes the injury to the job. The clock does not start at the first day of symptoms, which protects workers whose bodies break down over months or years.
What if the employer never gave the worker a DWC-1, does §5405 still apply?
California Labor Code §5405 can be extended where the California employer failed to provide the DWC-1 claim form within one working day of learning of the injury under California Labor Code §5401. The failure to provide the form is one of several recognized excuses to the one-year filing deadline, and the extension protects workers from forfeiture caused by employer non-compliance. The WCAB also recognizes equitable estoppel where the employer's conduct misled the worker.
What if the worker received some medical treatment during the year, does that extend §5405?
Yes, under California Labor Code §5405, the one-year clock can be extended when the California worker received any compensation within the window. "Compensation" includes medical care paid under California Labor Code §4600, temporary disability indemnity payments under California Labor Code §4653, or wage continuation paid by the employer in lieu of temporary disability. The clock then runs from the last date of compensation, which can extend the §5405 deadline well past the original date of injury.
Does §5405 apply to undocumented California workers?
Yes, California Labor Code §5405 applies to every California employee regardless of immigration status. Under California Labor Code §3351, California workers' compensation coverage extends to every worker regardless of immigration status. Under California Labor Code §244, the employer cannot threaten immigration-status reporting in retaliation for filing a claim. An undocumented California worker has the same one-year filing window under §5405, and the same recognized extensions apply.
What happens if a California worker files after the §5405 one-year deadline?
A California workers' compensation claim filed after the §5405 one-year deadline without a recognized exception is barred. The WCAB will dismiss it on the insurer's motion. A worker who believes a recognized extension applies, employer failure to provide the DWC-1, failure to post the workplace notice, receipt of compensation within the year, or cumulative-trauma discovery date, should file the application and plead the extension. The §5405 question is then litigated before the WCAB judge.
Last reviewed by Eman Yazdchi, Esq., June 2026.
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