Notice vs. claim: the two clocks every injured worker has to track

The two-clock problem

In almost every US state, the workers' compensation statute imposes a sequence of two deadlines. The first is short and measured in days: you have to tell your employer that you were hurt. The second is longer and measured in years: you have to file a formal claim with the state board or commission.

These clocks are not the same clock. They run in parallel, from different starting points sometimes, and missing the first does not stop the second from running. In several states, missing the notice clock can void your filing rights even if you file the formal claim well before the years-long filing deadline would have expired.

Clock 1: the notice deadline (days)

The notice deadline is the window in which you must inform your employer about the injury. The form of notice required varies by state — written, oral, or whatever the statute calls “reasonable” — but the direction is consistent: you are putting the employer on record that an injury happened on the job.

Common notice windows in the US:

• 30 days— the most common window. California Cal. Lab. Code §5400, New York NY WCL §18, and many others.
• 45 days — Illinois 820 ILCS 305/6(c).
• 90 days — Michigan MCL §418.381, Iowa Iowa Code §85.23.
• 21 days (with a 120-day absolute bar) — Pennsylvania 77 P.S. §631.
• As soon as practicable — Massachusetts M.G.L. c. 152 §41, Kentucky KRS §342.185, Connecticut Conn. Gen. Stat. §31-294b, Nebraska, Vermont. These are litigation-heavy because reasonableness is fact-dependent.
• 5 days (90-day absolute bar) — Alabama Ala. Code §25-5-78.
• 3 days / 72 hours— Wyoming Wyo. Stat. §27-14-502, the shortest notice window in the country.

Pull your state's exact rule from the 50-state reference before you act — the difference between 30 days and 5 days is the difference between “you have time” and “tell your foreman today.”

Clock 2: the filing deadline (years)

The filing deadline is the window for filing a formal claim with the state agency that administers workers' compensation: the WCAB in California, the WCB in New York, the OJCC in Florida, the BWC in Ohio, and so on.

Filing windows vary far more than notice windows. The shortest in the country is West Virginia's 6 months for accidental injury W. Va. Code §23-4-15. The longest is Wisconsin's 6 years for traumatic injury and 12 years for occupational disease Wis. Stat. §102.17(4). Most states fall between 1 and 3 years.

Two important wrinkles affect the filing clock:

• Last-payment-of-benefits triggers. Several states restart the clock from the date of the last indemnity payment or last medical benefit furnished, not the date of injury. California Cal. Lab. Code §5405 is the paradigm: 1 year from the later of injury, expiration of indemnity payments, or last medical benefit.
• Suspension regimes (post-Estes). Florida, after the 1st DCA's en banc ruling in Estes v. Palm Beach County School District (March 23, 2026), now treats §440.19's 2-year period as a clock that suspends while benefits flow and restarts 1 year after the last payment. Pre-Estes guidance is now obsolete.

What counts as “notice”

Most states will accept written notice in any reasonable form: an injury report on a company-issued form, an email to your supervisor, or a letter. Several states require it be written for the deadline to be formally satisfied, even if the employer otherwise had actual knowledge.

Actual knowledgeis the second route. If your foreman saw the accident happen, or your employer's safety officer was on scene, or the supervisor signed off on a workplace incident report — your state may treat that as putting the employer on notice even without a separate written statement from you. California Cal. Lab. Code §5400 and many other statutes contain an explicit knowledge exception.

When the clock starts also matters. For an acute injury, the clock starts on the date of injury. For occupational disease and cumulative trauma, most states use a discovery rule: the clock starts when the worker knew or should have known the condition was work-related. We treat that in the discovery-rule pillar.

What happens if you miss notice

In most states, missing the statutory notice window does not automatically bar the claim. The defenses available to the employer typically include some combination of:

• Prejudice to the employer. Several statutes excuse late notice unless the delay actually prejudiced the employer's ability to investigate or treat the injury.
• Actual knowledge. If the employer knew about the injury independently — a supervisor saw it, a safety officer logged it — the notice requirement may be excused.
• Incapacity.Some statutes excuse notice during periods of physical or mental incapacity. Alabama's §25-5-78, for example, expressly excuses notice during incapacity, fraud, or “equal good reason.”
• Employer failure to post statutory notices. A handful of states, California among them, toll the deadline if the employer failed to post the notice that informs employees of their workers' comp rights, or failed to provide a claim form on demand.

States that impose absolute bars are a different category. Alabama's §25-5-78 caps the outer notice window at 90 days. Pennsylvania 77 P.S. §631 imposes a 120-day absolute bar. New Jersey N.J.S.A. §34:15-17imposes a 90-day absolute bar. Inside the absolute window the equitable exceptions can apply; outside it, they typically don't.

Two short examples

Example 1. A warehouse worker in California slips on a wet floor and sprains an ankle. The injury happens on July 1. The worker tells the shift supervisor verbally on July 3 and again on July 10. They submit a written incident report on July 18. California requires written notice within 30 days Cal. Lab. Code §5400; the July 18 report falls inside that window. The 1-year filing clock under Cal. Lab. Code §5405runs from the later of the injury date, the end of indemnity, or the last medical benefit furnished — so the clock is paused as long as treatment continues.

Example 2. A construction worker in Wyoming slips off a scaffold on a Friday evening and is taken to the ER. Wyoming requires notice within 72 hours Wyo. Stat. §27-14-502— the shortest in the country. By Monday afternoon the worker is still on opioid pain medication and has not formally notified the foreman. The hospital sent the employer a workplace injury report on Saturday; whether that counts as putting the employer on actual knowledge is fact-specific. Wyoming's 1-year filing window for the formal claim is comparatively generous, but the notice question is open.

Example 3. A nurse in Ohio with a back injury from lifting a patient on December 15, 2018 has 1 year from injury to file under the post-2017 amendment to Ohio Rev. Code §4123.84. The nurse had been operating under the pre-2017 2-year assumption from a law firm's outdated blog post and missed the 1-year window. The 2017 amendment cut the SOL in half for traumatic injury and is the kind of change a stale web result will not tell you about.