Quick answer: Complete only the employee section of California's DWC 1 workers' compensation claim form, sign and date it, keep a copy, and give the remaining copies to the employer promptly. The employer completes its section, returns a dated copy, and sends the form to the claims administrator.
This guide explains the federal or state rule in practical filing terms. It uses the latest official material available on August 15, 2026; always use the form and instructions for the tax year you are filing because line numbers, limits and procedures can change.
At a glance
| Question | Practical answer |
|---|---|
| Who this applies to | California employees claiming a work-related injury or illness |
| What it does not cover | An Application for Adjudication at the Workers' Compensation Appeals Board or a substitute for emergency medical care |
| Where it is handled | Deliver to the employer; the employer forwards it to the workers' compensation claims administrator |
How the rule works
Start with the legal character of the payment, transaction, benefit or form—not the label used in an advertisement or summary. Tax results can differ when ownership, timing, filing status, residency, basis, participation or documentation changes. The controlling return instructions should be reconciled with all information statements before filing.
- Enter identity, address and the date the claim form was provided to the employee.
- State the date and location of injury and describe every affected body part clearly and factually.
- Describe how the injury or illness occurred without speculation or exaggeration.
- Sign and date the employee declaration and preserve a copy showing delivery.
- After filing, the employer must complete its section within one working day and provide the employee a dated copy.
Practical example
A warehouse worker strains a shoulder while lifting a crate. The worker identifies the shoulder, date, worksite and lifting event in plain language, signs the employee section, copies the form and hand-delivers it to a supervisor. The worker does not complete the employer or insurer fields.
The example isolates the main rule and is not a tax calculation for every fact pattern. Other income, deductions, state conformity, related-party rules and prior-year carryovers can change the final result.
Step-by-step checklist
- Seek urgent care first when necessary and notify the employer.
- Obtain the official DWC 1 form.
- Complete and review the employee section.
- Copy the form and document hand delivery or certified mailing.
- Save the employer-completed copy and all claim correspondence.
Keep copies of the filed return, schedules, source documents, calculations and submission confirmation. If an issuer or agency document is wrong, request a correction instead of silently changing a number without an explanatory record.
Common mistakes to avoid
- Writing only 'injured at work' without body parts or mechanism.
- Completing fields reserved for the employer.
- Failing to keep proof of when the claim was delivered.
A tax software interview can help transfer information, but it cannot verify an uncertain legal classification or recreate missing evidence. Pause and obtain advice from a credentialed tax professional or the responsible agency when the dollars are material or the facts are unusual.
Related NavajoTax guides
For connected planning and reporting issues, see document management and compliance, financial research process. Read related pages as a topic cluster, but follow the year-specific official form for the return you actually file.
Frequently asked questions
How fast should DWC 1 be filed?
Complete and return it promptly; delay can create benefit and proof problems even though claim deadlines involve additional rules.
What treatment is available while a claim is investigated?
The official notice states that up to $10,000 of treatment must generally be authorized within one working day after filing, consistent with applicable guidelines.
Is DWC 1 filed directly with WCAB?
No. It is first given to the employer. A disputed case may later require separate WCAB forms.
Sources reviewed
Last reviewed: August 15, 2026. This article provides general educational information, not individualized tax, legal, investment or benefits advice.