How Much Does Workers’ Comp Cost for a Small Contractor?
6 min read · Updated June 20, 2026
“How much is workers’ comp going to cost me?” has no single answer — but it does have a formula. Once you know the four things that drive it, you can ballpark your own cost and, more importantly, see the part that catches small contractors off guard.
The formula, quickly
Cost is roughly (payroll ÷ 100) × class rate × experience mod, plus small fees. Full breakdown here → Four inputs move it:
1. Your trade (class code)
This is the biggest single driver. A low-risk trade might run a few dollars per $100 of payroll; high-risk work like roofing can be many times that. Same payroll, very different bill. How class codes work →
2. Your state
Rates vary up to roughly 5× across states for the same work. If you operate in a high-cost state, everything above is multiplied. Why the same sub costs 5× more in one state →
3. Your payroll
More payroll, more premium — and remember “payroll” includes bonuses and straight-time overtime, not just base wages. What counts as payroll →
4. Your claims history (experience mod)
Once you’re established, your experience mod can swing your cost 15–25% in either direction.
The hidden cost small contractors miss
Your quoted premium isn’t the final number. At audit, every subcontractor who can’t prove their own coverage gets added to your payroll — which can turn a modest policy into a five-figure bill. For small contractors who lean on subs, this is the cost that hurts most. Check your subs →
Get a real number for your situation
Plug in your trade, state, and sub payments to see an estimate tuned to where you operate. Try the free audit exposure calculator →
General information for contractors, not a quote. Actual rates are set by your state bureau and carrier — confirm yours.
Frequently asked questions
How is workers’ comp cost calculated for a contractor?
Premium is roughly payroll divided by 100, times your class rate, times your experience mod, plus small fees. Your trade and state drive most of the difference.
Why is workers’ comp so expensive for contractors?
Construction trades carry high-risk class codes with high rates per $100 of payroll. The higher the injury risk of the work, the higher the rate.
Can my workers’ comp bill go up after the policy ends?
Yes. The year-end audit reconciles actual payroll, and uninsured subcontractors added to your payroll can raise the bill well above the original estimate.
See your own exposure — free
Two free tools, no signup: estimate your audit surprise, and check whether your subs’ COIs actually protect you.
Related guides
How Much Does a Claim Raise Your Workers’ Comp Premium?
A single claim can raise your workers’ comp premium for years through your experience mod. Here’s how the impact works and why frequency hurts more than size.
5 min read · Read →Workers’ Comp Class Codes for Contractors: How They Work and Why They Matter So Much
Class codes decide your workers’ comp rate, and contractor trades span a huge range. Here’s how class codes work, why the “governing” class matters, and how miscoding costs you.
6 min read · Read →Workers’ Comp Exemption Certificates: When a Sub Without Coverage Still Won’t Cost You
In many states a sole-proprietor sub can legally skip workers’ comp with an exemption certificate. Here’s how exemptions work and how to keep them from becoming your audit bill.
6 min read · Read →