Guides
Part of Workers compensation policy parts and premium drivers
5 details of workers compensation rules people miss
Five workers compensation rules that catch employers out, from owner elections to experience modification, and where each one is actually written.
Workers compensation is not one rulebook. It is fifty state systems, each with its own statute, its own board, and its own forms.
Five details catch employers again and again. None of them is obscure. All of them are easy to miss because nobody sends you a notice when they change.
What to take away
- Owners, officers and partners are often excluded from cover by default, and you have to file a form to change that.
- The experience modification factor follows your payroll record, not your policy year, and it is calculated by a rating bureau rather than your insurer.
- A subcontractor without its own cover can have its payroll added to yours at audit.
- Reporting an injury to OSHA and reporting it into the comp system are two separate obligations with different deadlines.
- Your class codes are audited against actual payroll, so a year of quiet underreporting becomes a bill.
1. Owner and officer elections
Most states include corporate officers in cover automatically. Sole proprietors, partners and LLC members are usually excluded unless they elect in.
The election is a filing, not a conversation. It goes to the board or the carrier on a state form, and it stays in force until you withdraw it. An owner who draws a salary but was never elected in has no cover for their own injury, and the medical bills land on the business.
Ask your board what the default is for your entity type, then check the form on file.
Who sets the default differs by state, and the offices have names. The New York State Workers' Compensation Board, the California Division of Workers' Compensation, the Texas Department of Insurance's Division of Workers' Compensation and the Florida Division of Workers' Compensation each publish their own rules on which owners and officers are covered. In New York, corporate officers are covered automatically and the Board publishes the filing that takes an officer back out. In most states the change is made on a numbered election or exclusion form, and a copy belongs in your file, not only with the carrier.
2. The experience modification factor
Your experience modification factor, or mod, is a multiplier applied to your manual premium. A mod of 0.85 means you pay 85 percent of the manual figure. A mod of 1.20 means you pay 120 percent.
It is built from your payroll by class code and your loss history over several policy years, not just the one you are renewing. A single serious claim can sit in the calculation for three years.
The worksheet comes from a rating or advisory bureau, and the bureaus have names. The National Council on Compensation Insurance, or NCCI, files loss costs and experience rating plans in most states. California uses the Workers' Compensation Insurance Rating Bureau of California and New York uses the New York Compensation Insurance Rating Board. North Dakota, Ohio, Washington and Wyoming are monopolistic states, where a state fund or state agency does the job. Ask your broker which bureau issued your experience rating worksheet, then read the worksheet itself before you accept the number.
3. Subcontractor payroll at audit
If you use subcontractors, the auditor will ask for certificates of insurance. Where a subcontractor has no cover of its own, its payroll is commonly added to yours for premium calculation.
That is not a penalty. It reflects that the uninsured worker was, for comp purposes, yours to cover. It is also the most common source of an audit bill that nobody budgeted for.
Collect certificates before work starts, check the dates, and keep them. The same logic runs through general liability, where an uninsured sub can pull you into someone else's claim.
The certificate you collect is normally the ACORD 25 Certificate of Liability Insurance. It shows the workers compensation and employers liability policy and its dates only if that policy was in force when the work was done. A certificate past its expiration date is worth nothing at audit, so keep the file, because the auditor will ask for it.
4. Two reporting systems, two deadlines
An injury that must be recorded under federal safety rules is not automatically reportable to OSHA, and a comp claim is not automatically an OSHA report.
Two systems, two clocks. OSHA's recordkeeping rule, 29 CFR 1904, has most employers with more than ten employees keeping Form 300, the log of work-related injuries and illnesses, recording each case on Form 301, and posting the annual summary, Form 300A, from February 1 to April 30. Separately, 29 CFR 1904.39 requires a fatality to be reported to OSHA within 8 hours, and an in-patient hospitalization, amputation or loss of an eye within 24 hours. The OSHA material on reporting severe injuries sets out those triggers.
Late notice to the carrier is one of the few things that can cost you coverage outright. Report first, argue about entitlement later.
Your own state sets the comp deadline, and it lives in that state's workers compensation statute and in the board's rules rather than in the policy. California requires the employer to give an injured worker the claim form, the DWC-1, within one working day of learning of the injury. Most states also give you only a short window from the date you learn of the injury to notify your carrier, and the board's own reporting page states the number.
5. Class codes and payroll drift
Every employee sits in a class code that carries a rate per hundred dollars of payroll. The codes are assigned from what your people actually do, not from what you call them.
Payroll drifts during the year. Overtime, a new crew, a shift in what a role involves. At audit the carrier reconciles the estimate against the real figure and bills or credits the difference.
The code descriptions come from the rating bureau's classification manual, the NCCI Basic Manual for Workers Compensation and Employers Liability Insurance in NCCI states, and each description follows the work rather than the job title. Move a crew into different work and the code, and the rate, can move with it.
The fix is boring and effective: review your classifications with your broker at renewal, and keep payroll records by class code as you go rather than rebuilding them in a panic. The full structure of the policy and how premium is assembled is in the main guide.
Where each rule is written
| Detail | Written by | Where you check it |
|---|---|---|
| Owner and officer elections | State statute and board rules | Your state board's guidance and the election form |
| Experience modification | Rating or advisory bureau filing | The bureau worksheet, via your broker |
| Subcontractor payroll | Policy wording and rating rules | Your policy's audit and classification conditions |
| Injury reporting | Federal safety rules and state board rules | OSHA and your state board, separately |
| Class codes and rates | Bureau filings approved by the state | Your policy declarations and the bureau's manual |
Every row is filled in differently in each state, because the whole system is a creature of state law rather than a federal program.
Who Sets Each Rule
The rule
- Cover required
- State legislature
- Injured worker benefits
- State statute
- Forms and deadlines
- Board or commission
- Disputes
- State statute and rules
- Classification and rating
- Rating organization
- Policy contract mechanics
- Insurer
Who sets it
- Cover required
- Board guidance
- Injured worker benefits
- Board schedule
- Forms and deadlines
- Board's current forms
- Disputes
- Board hearings section
- Classification and rating
- Your broker
- Policy contract mechanics
- Your policy documents
Where you look
- Cover required
- Injured worker benefits
- Forms and deadlines
- Disputes
- Classification and rating
- Policy contract mechanics
Three lookups fill the table for your own state. The state board's site gives the election and exclusion rules and the claim reporting deadline; the rating bureau gives your experience rating worksheet and the classification manual; and OSHA gives 29 CFR 1904 with Forms 300, 300A and 301.
A worked example of the mod
Take a business with manual premium of 40,000 dollars and a mod of 1.15. The modified premium is 46,000 dollars. The 6,000 dollar difference is not a fee and not a surcharge. It is the arithmetic of past claims.
Now suppose the same business runs two clean years. The claims drop out of the calculation window and the mod falls toward 1.00. At 0.90, the same manual premium costs 36,000 dollars.
Substitute your own manual premium and your own mod. The formula is manual premium multiplied by the mod, and nothing else in the calculation is yours to negotiate. What you can influence is the loss history feeding it.
Common questions
Is there a national rulebook I can read instead?
No. There are federal programs for particular groups of workers, and federal safety rules that run alongside, but the system covering most private employees is a state system with fifty variations. Start with your own state board.
My neighbor in the next state told me what applies. Is that useful?
As background only. Rules differ across state lines in ways that are not obvious, and acting on another state's answer is one of the more expensive mistakes available here. The obligations that follow from your own state's answers are set out in the requirements guide.
How would I know if the law changed?
You generally would not be told directly. That is why an annual look at the board's own material, and a written question to your broker at renewal, are worth the time. How much varies by sector is covered in the industry guide.
Do I need a lawyer for any of this?
For a disputed claim, a penalty notice, or a genuine question about whether someone is an employee, yes, and one who practices employment law in your state. For the routine reading of your own documents, the habit is described in the renewal reading guide.
