How Employers Report a Workplace Injury: The First 24 Hours to Claim Closure

8/28/2026

Most guidance on filing a workers' comp claim is written for the injured worker. This guide is for the other side of the desk: the HR, payroll and operations people who have to get the employer's part right.

The employer's part matters more than it looks. The employer usually controls how fast the carrier hears about an injury, what facts are captured while they are fresh, whether federal OSHA obligations are met, what wage figure the benefit is calculated from and whether anyone is watching the claim after it is filed. Each of those affects the cost of the claim, and through the experience modification, the cost of premium for years afterward.

What follows is the employer-side workflow from the moment of injury to claim closure. State deadlines and forms vary, and this article does not give day counts for them; your state's workers' comp agency publishes the rules, and our state pages (for example California, Florida and Ohio) are a starting point.

Before anything happens: the setup that makes reporting work

The reporting process that works in the first hour is the one built before the injury.

Know your carrier's reporting channel. Phone line, online portal, agent, or third-party administrator. Write it down where supervisors can find it.
Know your state's employer forms and deadlines. Most states use a first report of injury form or require the carrier to file one electronically, and set deadlines for employers and carriers.
Post the required notices. Most states require a workers' comp notice to employees, often naming the carrier and how to report an injury.
Tell employees how to report. OSHA's recordkeeping rule requires covered employers to inform each employee how to report a work-related injury or illness, and to have a reasonable procedure for doing so that does not deter reporting.
Choose medical providers in advance. In states where the employer may direct initial care, have the designated clinic and its after-hours option on file.
Assign a claims coordinator. One person (often in HR) who owns every claim from first report to closure.

The first hour: care first, then facts

1. Get the employee medical care

Medical care comes first, ahead of any paperwork. Call emergency services for anything serious. For non-emergency injuries, follow your state's rules on provider choice.

The standard workers' compensation policy lists the employer's duties if an injury occurs. The first is to "provide for immediate medical and other services required by the workers compensation law."

2. Secure the scene and preserve evidence

Photograph the location, equipment and conditions. Keep any equipment involved out of service if it may have contributed. Note who was present.

3. Get the basic facts down

Before the end of the shift, the supervisor should record:

Who was injured, when and where
What the employee was doing
What happened, in the employee's own words
Body part and nature of the injury
Witnesses and their contact details
Treatment given and where the employee went

Record facts, not conclusions. "Employee was careless" helps nobody; "employee was carrying a 40 lb box down the stairs without the handrail free" helps everyone.

The first 8 to 24 hours: OSHA reporting

Separate from workers' comp, federal OSHA requires covered employers to report the most serious events directly to OSHA. Under 29 CFR 1904.39:

Event	Deadline to report to OSHA
Work-related fatality	Within 8 hours after the death
In-patient hospitalization of one or more employees	Within 24 hours
Amputation	Within 24 hours
Loss of an eye	Within 24 hours

The clock rules matter. A fatality must be reported if the death occurs within 30 days of the work-related incident. A hospitalization, amputation or loss of an eye must be reported if it occurs within 24 hours of the incident. Reports can be made by phone or in person to the nearest OSHA Area Office, through OSHA's toll-free number or online.

This obligation applies to all employers covered by the OSH Act, including small employers that are exempt from keeping OSHA injury logs. States that run their own OSHA-approved plans can have their own reporting requirements, which may be stricter, so check your state plan.

Note that the OSHA report does not replace the workers' comp report. They go to different agencies for different purposes.

Within days: the first report of injury to the carrier

What the policy requires

The standard policy (NCCI's WC 00 00 00) says the employer must "tell us at once if injury occurs that may be covered by this policy." The listed duties include giving the insurer the names and addresses of injured persons and witnesses and other information needed, promptly passing along all notices, demands and legal papers, cooperating in the investigation, doing nothing that would interfere with the insurer's right to recover from others, and not voluntarily making payments or assuming obligations except at your own cost.

What the state requires

Each state sets its own requirements for the first report of injury (sometimes called the employer's first report, FROI or a state-numbered form): which injuries must be reported, the deadline, whether the employer files with the carrier or the state, and whether the carrier then files electronically with the state. Many states report through electronic data interchange from the carrier, but the employer still has to get the information to the carrier on time. Late reporting can carry state penalties.

Report even when you doubt the claim

Report every injury that may be covered, even if you think it is minor, not work-related or exaggerated. The carrier, not the employer, decides compensability, and a late report weakens the carrier's ability to investigate. If you suspect the claim, say so to the adjuster with the facts that support it; our article on workers' comp fraud red flags covers what to look for.

Do not pay small claims out of pocket to protect the mod. The policy says voluntary payments are at your own cost, and in states that apply NCCI's Experience Rating Adjustment, medical-only claims enter the mod calculation at only 30% of their value. The incentive to hide them is smaller than many employers think, and the risk of a small claim becoming a large, late-reported one is real.

Within 7 days: OSHA recordkeeping

Employers required to keep OSHA injury and illness records must enter each recordable case on the OSHA 300 Log and complete an OSHA 301 Incident Report (or an equivalent form) within seven calendar days of receiving information that a recordable injury or illness occurred.

Key rules from 29 CFR Part 1904:

Small employer exemption. A company with 10 or fewer employees at all times during the last calendar year does not need to keep the logs unless OSHA or the Bureau of Labor Statistics tells it to in writing. Certain low-hazard industries are also partially exempt. Both still must report fatalities and serious injuries.
Privacy cases. For privacy concern cases (including injuries to intimate body parts, sexual assault, mental illnesses, and certain infections and needlesticks) you enter "privacy case" instead of the employee's name and keep a separate confidential list.
Annual summary. The Form 300A summary must be posted from February 1 to April 30 of the year after the year it covers.
Keep the records for five years after the end of the calendar year they cover.
Electronic submission. Establishments with 250 or more employees, and establishments with 20 to 249 employees in designated industries, must submit Form 300A data electronically; establishments with 100 or more employees in a separate list of designated industries must also submit Form 300 and 301 data. The deadline is March 2 of the following year.
Anti-retaliation. Employers may not discharge or in any manner discriminate against an employee for reporting a work-related injury or illness.

OSHA recordability and workers' comp compensability are different tests. A case can be recordable but not compensable, or compensable but not recordable. Make each decision under its own rules.

The first two weeks: investigation and the wage statement

Investigate for prevention, not blame

Interview the employee, witnesses and supervisor. Identify the root cause and the corrective action, and document both. Share the investigation with the adjuster. A thorough, prompt investigation also supports subrogation where a third party (an equipment manufacturer, another contractor, a driver) caused the injury.

Get the wage statement right

This is the payroll department's main contribution to the claim, and it directly determines what the injured employee is paid.

Indemnity (wage replacement) benefits are calculated from the employee's average weekly wage, under a formula set by each state. The adjuster will ask payroll for a wage statement covering a defined period before the injury. The state decides:

How many weeks of earnings are used, and what happens if the employee has worked less than that
Whether overtime, bonuses, commissions and tips are included
Whether the value of employer-paid benefits, meals or lodging is included
How concurrent employment with another employer is handled

Common payroll errors: reporting only base pay when the state includes overtime, using the wrong look-back period, omitting the value of housing or meals provided as part of pay, and sending gross pay without the breakdown the adjuster needs. An understated wage leads to an underpayment that the employee, or the state agency, will eventually challenge. An overstated one costs money directly.

Once benefits start, payroll also has to handle how they interact with regular pay: whether the employee receives salary continuation, how PTO is used during a waiting period, and how benefit deductions continue while the employee is off. Our post on processing workers' comp payments through payroll covers taxability and setup.

Coordinate leave

A work injury that keeps someone off work is often also an FMLA-qualifying serious health condition, and may raise ADA accommodation questions. FMLA leave can run concurrently with workers' comp absence if you designate it properly. See Integrating FMLA, ADA and Workers' Comp.

While the claim is open: tracking and managing

Filing the report is not the end of the employer's job. The claims that cost the most are usually the ones nobody on the employer side was watching.

Stay in contact with the employee

Regular, supportive contact from someone at the employer is one of the most effective cost controls available. Employees who hear nothing from their employer after an injury are more likely to involve an attorney. Ask how they are, what they need and when they see the doctor next. Do not discuss the merits of the claim.

Bring them back as soon as it is medically safe

Lost time drives indemnity cost. A modified-duty assignment that fits the treating provider's restrictions shortens the claim and, in most states, reduces or ends temporary total disability benefits. It works best when transitional roles exist before the injury. See Return-to-Work Programs: Reducing Workers' Comp Costs.

Review the claim with the adjuster

Ask for a regular claim review, more often for lost-time claims. Cover:

Status: current treatment, restrictions and expected return-to-work date
Reserves: the amount the carrier expects to pay, by medical and indemnity
Next steps: independent medical exams, nurse case management, settlement prospects
Subrogation: whether a third party may be responsible

Why reserves matter to the employer

Open claims enter the experience modification at their incurred value, which includes reserves. An open claim reserved well above what it will likely cost inflates the mod until it is reduced or closed. Ask the adjuster how each reserve was set, provide information that supports a lower figure (an early return to work, for example) and ask for reserves to be reviewed before the date your carrier reports loss data for the next rating. You cannot negotiate a reserve down without facts, but you can make sure the facts are in the file.

Closing the claim

A claim closes when the employee has finished treatment and all benefits are paid, or when it is settled under the state's procedures. Before closure:

Confirm the employee's work status and any permanent restrictions, and handle any ADA accommodation obligations
Confirm that payroll has stopped any salary continuation and restored normal deductions
Confirm the claim shows as closed, with the correct paid amount, on the next loss run
Complete the corrective actions from the investigation
Keep the file, including the OSHA records, for the required retention periods

A simple employer claim log

Keep one log of every injury, whether or not it became a claim:

Field	Why it matters
Date of injury and date reported to carrier	Reporting lag is a cost driver and a compliance issue
OSHA recordable? Reportable?	Separate federal obligations
Claim number and adjuster	Contact and follow-up
Lost time? Days away / restricted	Indemnity exposure and OSHA log
Return-to-work date	Measures program effectiveness
Current reserves (medical / indemnity)	Experience mod impact
Next review date	Keeps the claim from going quiet

Training for claims coordinators

Most employers spread claims work across HR, payroll, safety and supervisors, and the claims that go wrong usually fall into the gaps between them. Our webinar Tips For Tracking, Monitoring and Managing Your Workers' Comp Claims is aimed at the person who owns the claim after the first report is filed. For teams building a broader program, Practical Tips That Strengthen Your Workers' Comp Program and Your Bottom Line covers the wider set of controls.

Frequently Asked Questions

How does an employer file a workers' comp claim?

The employer reports the injury to its workers' comp carrier (or third-party administrator, or the state fund in monopolistic states) using the carrier's reporting channel, providing the employee's details, what happened, witnesses and the treatment given. The carrier assigns an adjuster and, in most states, files the first report of injury with the state electronically. Some states require the employer to file a form directly. Separately, the employer must report fatalities and serious injuries to OSHA and record recordable cases on the OSHA 300 Log if it is required to keep one.

What is a first report of injury?

A first report of injury is the initial notice of a work-related injury or illness, sent by the employer to the insurer and passed on to the state workers' comp agency. It records who was hurt, when, where and how, the nature of the injury, treatment, and employment and wage information. States set their own form, the injuries that must be reported and the deadline. Many states now receive these reports from carriers by electronic data interchange, which means the employer's job is to give the carrier complete information quickly.

How soon must an employer report a work injury?

There are two separate clocks. For workers' comp, the standard policy requires you to tell the insurer at once, and each state sets its own deadline for the first report of injury, which you should confirm with your state agency. For OSHA, a work-related fatality must be reported within 8 hours, and an in-patient hospitalization, amputation or loss of an eye within 24 hours. Recordable cases must be entered on the OSHA 300 Log within seven calendar days if you are required to keep one.

Does every workplace injury need to be reported to the insurance carrier?

Report every injury that may be covered by the policy, even minor ones and ones you doubt. The standard policy requires prompt notice, and voluntary payments you make without the insurer's consent are at your own cost. Late reporting weakens the carrier's investigation and can carry state penalties. Paying small medical bills directly to protect the experience mod rarely pays off: in states that apply NCCI's Experience Rating Adjustment, medical-only claims count at only 30% of their value in the mod calculation.

What is the difference between an OSHA recordable injury and a workers' comp claim?

They are separate systems with separate tests. OSHA recordkeeping uses federal criteria (such as days away, restricted work, medical treatment beyond first aid) to decide whether a case goes on the OSHA 300 Log, and requires certain serious events to be reported to OSHA directly. Workers' comp compensability is decided by the carrier and state law based on whether the injury arose out of and in the course of employment. A case can be recordable but not compensable, or the reverse, so decide each one under its own rules.

What does payroll need to provide on a workers' comp claim?

Mainly the wage statement used to calculate the employee's average weekly wage, which drives indemnity benefits. The state sets the look-back period and whether overtime, bonuses, tips and the value of meals, lodging or other benefits are included. Payroll also manages how benefits interact with regular pay: salary continuation, PTO use during any waiting period, continued benefit deductions and the tax treatment of payments. Accurate, prompt wage information prevents underpayments that lead to disputes and overpayments that raise claim cost.