Workers comp 101for contractors.

1. What workers comp actually is

Workers compensation insurance is a state-regulated policy that covers two things when an employee gets hurt on the job: the medical bills, and the lost wages while they recover. It also covers death benefits in the worst cases, and legal defense costs if an injury claim turns into a lawsuit.

Every US state runs its own workers comp system, with its own rules about who's required to carry it, how rates get set, and which body regulates the market. A few examples from states we work in often:

Each state has its own regulator. Some states call it a State Board of Workers' Compensation, some call it the Bureau of Workers' Compensation, and some run it through their Department of Labor or Industrial Commission. The names vary; the function is the same — they set the rules, license the agents, and oversee disputes.

The system protects your employees. It also protects you. Without workers comp, an injured employee can sue you directly for medical costs, lost wages, pain and suffering — and the awards can wipe out small businesses. With workers comp in force, those claims go through the insurance system instead of through you personally.

2. Who's required to have it

The threshold that triggers the requirement varies state-by-state, and it's usually based on employee count. Most states fall into three buckets:

1-employee threshold (strictest)

A handful of states — most notably for construction-industry businesses — require workers comp from your very first employee. Subcontractors usually count as employees for comp purposes unless they carry their own policy and show you a valid certificate of insurance. If you're a trade contractor, assume you need it from day one until we tell you otherwise for your specific state.

3-employee threshold (common)

A number of states require workers comp once you have 3 or more regular employees — full-time, part-time, or seasonal. This is the most common floor for non-construction businesses.

5-employee threshold (lighter)

Some states use a 5-employee threshold across most industries. Sole proprietors, partners, and LLC members can often elect out of coverage on themselves, which means their wages don't factor into premium — but they also have no comp benefits if they personally get hurt on the job.

Tell us your stateand we'll give you the specific threshold, the regulator, and the realistic options. Don't guess on this — the wrong answer can mean an uncovered injury or a regulatory penalty.

Do I need it if I'm a one-person operation?

Legally, no — in most cases a true solo operation doesn't hit the threshold. Practically, often yes: any commercial GC hiring you will almost always require a current certificate of insurance (your "cert") regardless of your crew size. Many solo contractors buy a minimum policy specifically to have that cert available for bids.

3. How your premium actually gets calculated

Your annual premium isn't a mystery — it's math. The base formula looks like this:

Let's walk it through with real numbers. Say you're a plumber with $500,000 in annual payroll, classified under NCCI code 5183 (Plumbing) with an approximate base rate of $5.25 per $100 of payroll:

• Payroll: $500,000 ÷ 100 = 5,000 "payroll units"
• Class rate: $5.25 per unit
• State modifier: 1.00 (baseline — varies by state)
• Experience mod: 1.00 (standard, no claims history)
• Result: 5,000 × 5.25 × 1.00 × 1.00 = $26,250 annual premium

Every variable is a lever. Payroll is what it is. Class rate depends on how your business is classified (more on that below). State modifier is fixed for the state. But experience modifier is where your own safety record and claims history move the number — sometimes dramatically.

4. Class codes, explained

A class code is a 4-digit number that classifies the work your business does. It's set by NCCI (the National Council on Compensation Insurance), which publishes base rates for every code nationally. Your state then modifies those rates with its own factor.

The major trade classes look like this:

Notice the huge gap between roofing ($22) and electrical ($4.75). That 4x spread isn't bias — it reflects decades of NCCI loss data. Roofers fall off roofs; electricians generally don't.

Split classifications

Here's where it gets strategic. If you're a GC who spends 60% of your week supervising rather than swinging a hammer, your wages can often split between class 5645 (field labor, $8.50 rate) and class 5606(supervisor, $2.10 rate). Same total payroll, dramatically different premium — because you're classifying your actual work correctly rather than defaulting everything to the highest rate.

Split classifications require legitimate role documentation. Carriers will question whether the split is real. But when it's justified, it's meaningful money.

5. Experience modifier — the biggest lever

Your experience modifier ("mod") is a multiplier applied to your base premium based on your last 3 years of claims data. It's the single biggest variable in your premium after payroll itself.

• 1.00 — industry average. No impact.
• Below 1.00 — clean history. Your premium gets discounted. A 0.80 mod means you pay 20% less than average.
• Above 1.00 — worse-than-average claims. Premium gets surcharged. A 1.30 mod means you pay 30% more.

On a $26,000 base premium, the difference between a 0.85 mod and a 1.20 mod is about $9,100 per year. On a 10-year horizon, that's nearly $100,000. Experience mod is the place where safety programs and claims management actually pay for themselves in cash.

How to improve your mod

• Time. Three years of clean claims data rolls you toward 1.00 from above. There's no shortcut — you have to put time in the system without new claims.
• Safety programs. Documented training, written policies, PPE compliance. These don't directly lower mod, but they prevent the claims that raise it.
• Claims management. Report injuries within 24 hours. Get employees medical care promptly. Keep them engaged during recovery. Late-reported and mismanaged claims almost always settle higher and impact mod more.
• Audit your loss runs. Miscoded claims happen. We sometimes find claims incorrectly attributed to a business, inflating mod. Ask your current carrier for your loss runs and review them.

6. What a premium audit is and why it matters

Workers comp is priced on estimatedpayroll at policy start. At policy end, the carrier does a "premium audit" — reviews your actual payroll during the year and reconciles against what you estimated.

Three outcomes:

• You estimated high. Your actual payroll came in lower than projected. You get a refund.
• You estimated low. Your actual payroll came in higher. You owe the difference — and it's often a surprise bill contractors don't budget for.
• You estimated right. No adjustment.

The big mistake: contractors try to save money upfront by under-estimating payroll. It feels like a win in month one. It becomes an expensive, sometimes business-threatening, reconciliation bill in month twelve. Estimate honestly. Consider pay-as-you-go billing, which ties premium collection to actual pay periods in real time — no year-end surprise.

7. How to actually lower your rate

Five real levers, ranked by impact for most trade contractors:

1. Run a clean 3-year claims history.Nothing moves premium like experience mod. This is slow and cumulative but it's where the real money is.
2. Classify correctly. Make sure your class codes reflect your actual work. Split supervisors from field crew. Split low-voltage from power electrical. Small reclassifications compound.
3. Shop carriers. For lower-rated classes (plumbing, electrical), the difference between an average quote and a sharp one can be 15-20%. A broker with multiple carrier appointments can compare for you.
4. Document a safety program. OSHA compliance, documented training, toolbox talks, PPE checks. Some carriers give direct credits. All carriers view it positively at quote time.
5. Manage claims actively. Fast reporting. Early medical care. Light-duty programs where possible. Settled-quickly claims impact mod less than drawn-out cases.

8. What carriers actually look for

When a carrier decides whether to write you — and at what rate — they're looking at five things:

• Your loss history. 3-year claims runs. Clean = easy underwrite. Rough = hard conversations.
• Your safety program. Documented matters more than verbal. Written policies, training records, PPE compliance.
• Your payroll stability. Steady payroll is easier to underwrite than wild seasonal swings. Variable trades should use pay-as-you-go.
• Your business age + experience. New businesses without claim history get priced more cautiously. Established operations with a track record get priced sharper.
• Your classification accuracy. Carriers will verify that your stated class codes match the actual work. Misclassification caught at audit can trigger adjustments and non-renewals.

9. Mistakes contractors make most often

• Under-estimating payroll to save money on premium — then getting an unexpected audit bill 12 months later that blows up cash flow.
• Defaulting all payroll to the highest class code instead of splitting legitimately. Overpaying by 10-20% for the whole policy period.
• Ignoring experience mod until renewal season, then trying to fix something that needs 3 years to change.
• Hiding claims or discouraging employees from reporting. Claims come out at audit and carrier refresh anyway — and now you've added dishonesty to the underwriting file.
• Not shopping at renewal. Loyalty gets rewarded with complacency pricing. A market-shop every 2-3 years keeps pricing honest.
• Using 1099 subs without confirming their coverage. In construction states, uninsured subs count as your employees. That can invalidate your policy and leave you personally exposed on a claim.

10. Getting started

If you're shopping for workers comp, here's what to gather before you ask for a quote:

• Your state, trade, and estimated employee count
• Annual payroll (projection is fine for the quote — you'll firm it up at binding)
• Your current carrier, if any, and the current policy's expiration date
• Loss runs for the last 3 years, if available (ask your current carrier — it's a standard request)

None of this is mandatory to get started — we can quote with just your state, trade, employee count, and payroll estimate. Everything else firms up as we work together.

Figures on this page are illustrative. Your premium depends on your state, class codes, payroll, experience modifier, and carrier. Nothing here is a quote or a promise of rate.