One working day. That’s how long a California employer has, under Labor Code section 5401, to give an injured worker a claim form once it learns of an injury that needs more than first aid or costs time beyond the shift. Knowledge counts even if the worker never reports it formally. Once the form comes back, the employer’s carrier has 90 days to reject the claim or the injury is presumed compensable. Slow handling here creates exposure in the comp case and in any later employment lawsuit.
When does the one-working-day clock start?
When the employer has notice or knowledge of an injury that goes beyond first aid. Section 5401(a) covers any injury “which results in lost time beyond the employee’s work shift at the time of injury or which results in medical treatment beyond first aid.” For those, “the employer shall provide, personally or by first-class mail, a claim form and a notice of potential eligibility for benefits” to the worker.
The form is the Division of Workers’ Compensation’s DWC-1, which combines the claim form and the benefits notice. Subdivision (b) says that, insofar as practicable, the two “shall be a single document.”
First aid has a narrow meaning. The statute defines it as “any one-time treatment, and any followup visit for the purpose of observation of minor scratches, cuts, burns, splinters, or other minor industrial injury.” A second visit for treatment, prescription care, or physical therapy is past first aid. Serious exposure to a hazardous substance never counts as a minor injury.
Does a supervisor’s knowledge count as the company’s?
Yes. Labor Code section 5402(a) says knowledge of an injury “obtained from any source, on the part of an employer, the employer’s managing agent, superintendent, foreman, or other person in authority” is equivalent to formal notice.
That’s the part companies get wrong. A shift lead who hears an employee mention a sore back from lifting, or who sees someone limping after a fall, may have given the company knowledge. If that supervisor doesn’t pass it on, the claim form goes out late, and the record will show the company knew. Training frontline supervisors to report injuries to HR the same day is the single most useful fix.
The statute also covers “knowledge of the assertion of a claim of injury sufficient to afford opportunity to the employer to make an investigation.” An employee doesn’t need to use the words “workers’ comp.” Saying an injury happened at work is usually enough.
What happens after the worker returns the form?
Two clocks start. Under section 5402(c), “Within one working day after an employee files a claim form under Section 5401, the employer shall authorize the provision of all treatment” for the alleged injury, and must continue until the claim is accepted or rejected. Until then, “liability for medical treatment shall be limited to ten thousand dollars ($10,000).”
Paying for that treatment isn’t an admission. Subdivision (d) says treatment provided under subdivision (c) “does not give rise to a presumption of liability on the part of the employer.”
The second clock is the decision. Section 5402(b)(1) says that if liability “is not rejected within 90 days after the date the claim form is filed,” the injury “shall be presumed compensable.” The presumption “is rebuttable only by evidence discovered subsequent to the 90-day period.” For certain presumptive injuries listed in the statute, mostly involving public safety workers, the period is 75 days.
The employer also owes paperwork to others. Section 5401(c) says “A dated copy of the completed form shall be provided by the employer to the employer’s insurer and to the employee” or whoever filed it.
Why does the claim form matter in an employment lawsuit?
Because the comp claim often becomes part of a later retaliation or disability case. Labor Code section 132a bars discriminating against an employee “because he or she has filed or made known his or her intention to file a claim for compensation.” The DWC-1’s date often marks the start of the protected activity a plaintiff points to.
A late form looks bad in that context. If a manager discouraged the worker from filing, or the form went out only after the employee pushed for it, a plaintiff will argue the company was hostile to the claim from the start. A prompt, documented handoff of the form is the employer’s best evidence that it treated the injury as routine.
The same facts can feed a FEHA disability claim. A work injury that limits the employee’s duties may also trigger the duty to accommodate and engage in the interactive process, which runs separately from the comp system. The comp claim doesn’t replace those obligations.
Claim form duties and the rule behind each
| Duty | Deadline or limit | Rule |
|---|---|---|
| Give the claim form and benefits notice | One working day after notice or knowledge | Lab. Code 5401(a) |
| Supervisor’s knowledge of injury | Counts as the employer’s knowledge | Lab. Code 5402(a) |
| Send dated copies of the filed form | To the insurer and the employee | Lab. Code 5401(c) |
| Authorize treatment after filing | One working day, up to $10,000 until decided | Lab. Code 5402(c) |
| Accept or reject liability | 90 days, or the injury is presumed compensable | Lab. Code 5402(b) |
When an employee reports a work injury
- Preserve the incident report, witness statements, video, the DWC-1 with its delivery date, and any emails or texts about the injury.
- Calendar the one-working-day deadline for the form and the 90-day decision date, and report the claim to the carrier and, if a related demand or charge arrives, the EPLI carrier.
- Identify the supervisor who first learned of the injury and the witnesses, and make sure no one discourages the claim or changes the worker’s schedule or duties without a documented reason.
- Pull the job description, the work restrictions from the treating doctor, and any accommodation requests the injury produces.
- Talk to a lawyer before disciplining, reassigning, or terminating an employee with an open claim.
The firm’s page for California employer defense lawyers explains how it handles employment claims that grow out of workplace injuries. A related post covers workers’ comp retaliation claims under section 132a.
DWC-1 questions from employers
Do we have to give the form if we think the injury isn’t work-related?
Yes, if the injury goes past first aid and the company knows the worker is claiming it happened at work. The form starts the process. It doesn’t concede liability. The carrier investigates and decides, and the employer’s doubts belong in that investigation rather than in a refusal to hand over the form.
Can we mail the claim form instead of handing it over?
Yes. Section 5401(a) allows the employer to provide it “personally or by first-class mail.” Keep proof of the date it went out, such as a signed receipt or a mailing log. That date may matter later in the comp case or in a lawsuit.
What if the employee refuses to fill out the form?
Document the offer. The duty is to provide the form, and the worker decides whether to file it. Note the date, who gave it, and the response. Never pressure an employee either way, since a record of discouraging the claim can support a retaliation theory.
Does the 90-day presumption affect our employment case?
Not directly. It’s a workers’ comp rule about whether the injury is compensable. But an accepted or presumed claim can shape the facts in a later lawsuit, such as whether the injury was real and when the employer knew of it. Coordinate with the comp carrier’s defense counsel when both cases are open.
If a work injury has turned into an employment claim
If an injured employee has sued or filed a charge alleging retaliation or disability discrimination after a comp claim, the claim form’s timing and the supervisor’s response usually frame the defense. Rosenberger + Kawabata represents employers defending employment lawsuits and claims through its business litigation practice, including claims involving workplace injuries and retaliation. Contact Rosenberger + Kawabata online for a confidential consultation, or call (310) 894-6921.
Sources
The statutes are Labor Code sections 132a, 5401, and 5402. The form is the Division of Workers’ Compensation’s DWC-1.
This post is general information about California and federal employment law as of November 7, 2026. It is not legal advice, and reading it does not create an attorney-client relationship. Employment statutes, regulations, and court decisions change often, and the outcome of any claim depends on its facts. Past results do not guarantee future outcomes.