California Workers' Comp Statute of Limitations — Filing Deadlines That Decide Claims

What are the two main deadlines?

There are two. Report your injury to your employer within 30 days. Then file your formal claim within one year of the injury date.

Two clocks start the moment you get hurt. Miss either one, and the insurer gets an easy way to fight you. The good part: both deadlines are simple to meet.

First, tell your employer fast. The law asks you to report within 30 days under Labor Code 5400. A text, an email, or a written note all count. Just say you got hurt at work and give the date. Keep a copy for yourself.

Second, file your formal claim. You have one year from the injury under Labor Code 5405. Filing is more than telling your boss. It means putting your claim on the official record with the right form. That form is the DWC-1. We can fill it out and file it for you.

Picture a forklift driver who tweaks his shoulder on a Monday. He tells his lead that day. That covers the 30 day report. But he still must file the DWC-1 within the year. Telling the boss alone is not enough. Here are the key dates.

When does the clock start for a build-up injury?

It starts later than you would guess. The clock begins once you learn the harm is real. You must also know your job caused it.

Not every injury happens on one bad day. Many build up slowly. They come from doing the same hard thing over and over. Think of a sore back from years of lifting boxes. Or a numb, aching wrist from a scanner gun. Or bad knees from miles on a hard warehouse floor.

These are called cumulative injuries. For them, the clock does not start at some random past date. Under Labor Code 5412, it starts when two things meet. First, you feel the disability. Second, you know, or should know, that work caused it.

What does "should know" mean here? It usually means the day a doctor tells you. That is when your job gets tied to your pain in writing. Before that, you were just hurting and guessing. The law does not punish you for not knowing sooner.

So a slow injury often gives you more time than you feared. Say a grocery clerk has wrist pain for two years. She does not file. Then a doctor says the scanning caused it. Her one year clock starts on that day, not two years back.

What can give you more time to file?

Several things can. A paid benefit can push your deadline back. So can a missing claim form. A build-up injury or later flare-up does too.

The one year limit is not always firm. The law adds time in fair cases. Do not assume your case is dead. Here are the most common ways you get more time.

The insurer already paid something. Did they cover a doctor visit? Did they send any benefit check? If so, your clock runs from that last payment, not from the injury. Each new benefit can push the date forward. Many workers have far more time than they think for this reason.

You never got a claim form. Your employer must give you a DWC-1 form and explain your rights. That duty is on them, not you. If they never did it, the clock can pause until they do. Their silence should never cost you your benefits.

Your injury got worse later. Maybe your case closed, then your back flared up again. You can reopen it under Labor Code 5410. You have up to five years from the injury date. This covers new or worsening disability from the same injury.

One warning. These rules are real, but they are also fact-heavy. The insurer will read them as narrowly as it can. If you can still meet the basic deadline, do that. Do not rely on an exception. When in doubt, file early and call us.

What happens after you file on time?

The pressure shifts to the insurer. They get 90 days to accept or deny. If they miss it, your injury is presumed covered.

Filing on time does more than save your claim. It flips the clock onto the insurer. Now they face the deadlines, not you.

Under Labor Code 5402, the insurer gets 90 days to act. They must accept or deny your claim in that time. If they blow past 90 days, the law presumes your injury is covered. That presumption is hard for them to undo.

You are also protected while they investigate. They cannot freeze your medical care during those 90 days. The law makes them pay for treatment right away, up to a set cap. So your care starts even before they decide. You should never sit in pain waiting on paperwork.

This is why filing fast helps twice. It locks in your deadline. And it forces the insurer onto a clock of its own. Here is what they owe once your claim is in.