How long do I have to report a work injury and file a claim in California?

In California, a work injury must be reported to the employer in writing within 30 days (Labor Code 5400). Proceedings for benefits generally must start within one year, counted from the date of injury, the end of a period covered by a disability payment, or the last date medical treatment was furnished (Labor Code 5405). For cumulative trauma (an injury that builds up from repeated activity over time) and occupational disease, the date of injury is not the first day of symptoms. Labor Code 5412 sets it at the point the worker first had disability from the condition and knew, or should have known, that work caused it. A worker whose condition gets worse can seek more benefits for new and further disability within five years of the date of injury (Labor Code 5410).

How long do I have to tell my employer about a work injury?

Labor Code 5400 requires written notice to the employer within 30 days after the injury, signed by the worker or someone acting for the worker. The section is subject to sections 5402 and 5403. Under section 5402(a), knowledge of the injury counts as notice when it reaches the employer, a managing agent, a superintendent, a foreman or another person in authority.

The Division of Workers’ Compensation (DWC) says in its FAQ for employees that a worker could lose the right to benefits if the employer does not learn of the injury within 30 days and that keeps the employer from fully investigating it. The rule behind that is Labor Code 5403: missing or defective notice is not a bar to recovery if it is found that the employer was not in fact misled or prejudiced by it.

How long do I have to file the DWC 1 claim form?

The DWC 1 claim form’s own instructions say to file it right away. The DWC’s Fact Sheet C warns that a worker who does not file the claim form within a year of the injury may not be able to get benefits.

The employer must give the worker the form, in person or by first-class mail, within one working day of learning of the injury. That duty applies when the injury causes lost time beyond the work shift or needs treatment beyond first aid (Labor Code 5401(a); DWC guidebook, chapter 2).

Filing the form also starts two protections in Labor Code 5402. Treatment must be authorized within one working day, with the employer’s liability limited to $10,000 while the claim is investigated. If the claim is not rejected within 90 days, the injury is presumed compensable, or covered (75 days for the injuries listed in sections 3212 to 3212.85 and 3212.9 to 3213.2). The full first-week sequence is in what to do after a work injury.

What is the one-year deadline in Labor Code 5405?

Section 5405 gives one year to start proceedings to collect medical benefits (the article of the Labor Code that begins with section 4600) or disability payments (the article that begins with section 4650). The year can run from any of three dates: the date of injury, the end of any period covered by a disability payment, or the last date medical treatment was furnished.

The DWC ties this deadline to the Application for Adjudication of Claim, the form that opens a case at the Workers’ Compensation Appeals Board (WCAB). Its Fact Sheet G says the application generally must be filed “within one year from the date of injury or from the last date on which benefits were provided,” and that other special time limits apply in certain situations.

For injuries on or after January 1, 1994, Labor Code 5401(d) tolls, or pauses, the section 5405 limit once the DWC 1 claim form is filed. The pause lasts until the claim is denied or the injury becomes presumed compensable under section 5402.

When does the clock start for a cumulative trauma injury?

For a cumulative injury, Labor Code 5412 sets the date of injury as the date the worker first suffered disability from it and either knew, or with reasonable diligence should have known, that the disability was caused by present or prior employment. The same rule applies to occupational diseases. A date picked any other way, such as the first ache, may not match the statute.

A cumulative injury, under Labor Code 3208.1, comes from repetitive mentally or physically traumatic activities over a period of time whose combined effect causes disability or a need for medical treatment. Repetitive strain claims are covered in cumulative trauma and workers’ comp.

What is the five-year rule in Labor Code 5410?

Section 5410 lets an injured worker start proceedings for more compensation within five years after the date of injury, on the ground that the original injury has caused new and further disability. Within that period the appeals board keeps continuing jurisdiction over the case.

The DWC’s I&A Guide 11, on the petition to reopen a case after a judge has issued an award, gives the same window: five years from the date of injury to file the petition.

Which deadlines apply, and which section sets each one?

What	Time limit	Counted from	Section
Written notice to the employer	30 days	The injury	LC 5400; employer knowledge counts under 5402(a)
Claim form given to the worker	1 working day	Employer notice or knowledge of an injury needing more than first aid or causing lost time beyond the shift	LC 5401(a)
Treatment authorized, liability up to $10,000	1 working day	Filing of the claim form	LC 5402(c)
First temporary disability payment, if owed	14 days	Employer knowledge of the injury and disability	LC 4650(a)
Accept or deny the claim	90 days (75 for the listed presumption injuries)	Filing of the claim form	LC 5402(b)
Written objection to a treating doctor’s report on issues such as work status (not treatment)	20 days with an attorney, 30 without	Receipt of the report	LC 4062(a)
Request for independent medical review of a utilization review denial	30 days (10 for MTUS Drug List drugs)	Service of the UR decision	LC 4610.5(h)
Start proceedings at the WCAB	1 year, paused from the filing of the claim form until a denial	The injury, the end of the last disability payment period, or the last treatment furnished	LC 5405; LC 5401(d)
New and further disability	5 years	The date of injury	LC 5410
Date of injury for cumulative trauma and occupational disease	Sets the start date	First disability plus knowledge that work caused it	LC 5412

Sources: Labor Code 5400, 5401, 5402, 4650, 4062, 4610.5, 5405, 5410 and 5412; the DWC Guidebook for Injured Workers, chapter 2. Read October 8, 2026.

What do people get wrong about these deadlines?

• Counting a cumulative trauma deadline from the first symptom. Labor Code 5412 sets the date of injury at disability plus knowledge that work caused it.
• Reading the five-year rule as five years from a settlement. Section 5410 counts from the date of injury.
• Assuming that a missing written notice ends the claim. Section 5402(a) treats an employer’s knowledge as notice. Late notice can still cause problems, but under section 5403 it bars recovery only if the employer was misled or prejudiced by it.
• Treating the one-year limit as a single fixed date. Under section 5405 it can run from the injury, the end of the last disability payment period or the last medical treatment furnished. Section 5401(d) pauses it from the filing of the claim form until a denial or the 90-day presumption.

What should I read next?

• Repetitive strain and the date-of-injury rule: cumulative trauma injuries and workers’ comp.
• The first week after an injury: what to do after a work injury.
• A denial letter: my workers’ comp claim was denied.
• What a denied-claim case involves: denied workers’ comp claims.

Which date controls in one particular claim is a question for a lawyer who has the documents, not for this page.

Where does the Law Office of Jesse Melendrez fit?

Deadline questions turn on paper: the date on the claim form, the last temporary disability check, the last treatment visit, the first medical record that tied a condition to work. Those are the documents a lawyer reads before saying which date applies.

The Law Office of Jesse Melendrez is in Newport Beach. We limit our practice to California workers’ compensation and represent injured workers only, with cases at the WCAB district offices in Santa Ana, Anaheim, Los Angeles, Riverside and San Diego. Attorney Jesse Melendrez (State Bar of California #263751) has represented injured workers since 2009.

This page explains the deadlines in general. It is not legal advice about your claim. If you would like us to look at the dates in yours, tell us what happened.