Workers' Compensation Cost by Trade
How workers' comp premiums are priced — and why a welder costs far more to insure than a bookkeeper.
Workers' compensation insurance pays for medical care and lost wages when an employee is injured on the job. In almost every state it is legally required once you have employees, and it is one of the biggest reasons the true cost of a tradesperson is far higher than that of an office worker. Unlike payroll taxes, workers' comp is priced on the risk of the work — so a roofer costs dramatically more to insure than a bookkeeper earning the same wage.
This guide explains how workers' comp is priced, what drives your rate, and roughly what different trades pay. Plug your own class-code rate into the Employee Cost Calculator to see it in your fully-loaded number.
How workers' comp premiums are calculated
The core formula is simple:
Premiums are quoted as a dollar amount per $100 of payroll. So a rate of $3.00 means you pay $3.00 in premium for every $100 you pay that employee — or 3% of payroll. On a $52,000 wage, that is about $1,560 per year.
Class codes: the biggest driver
Every job is assigned a class code (most states use the NCCI system) that reflects its injury risk. Clerical and professional codes carry very low rates — often well under $0.50 per $100. Manual trades carry much higher rates. Your insurer assigns codes based on the actual duties performed, not job titles, so accurate descriptions matter.
Experience modifier
Established employers receive an experience modification factor ("mod") that adjusts the base rate up or down based on their claims history versus similar businesses. A mod of 1.0 is average; below 1.0 lowers your premium (good safety record), above 1.0 raises it. New businesses start at 1.0 until they have enough history.
Typical workers' comp rates by trade
These are broad, illustrative ranges (as a percent of payroll). Your actual rate depends on your state, carrier, class code, and mod — always get a real quote.
| Type of work | Typical rate (% of payroll) |
|---|---|
| Office / clerical / IT | ~0.2% – 0.4% |
| Retail / sales | ~1% – 1.5% |
| Manufacturing / machinist | ~2.5% – 3.5% |
| Automotive / mechanic | ~3% – 4% |
| Warehouse / logistics | ~3.5% – 4.5% |
| Welding / fabrication | ~3.5% – 5% |
| Construction / trades | ~5% – 8%+ |
| Trucking / transportation | ~6% – 9%+ |
Why it matters for pricing
Two employees earning the same $30/hour can cost very different amounts once workers' comp is included. A machinist at 3% adds about $1,870 a year on a $62,400 wage; a construction worker at 7% adds about $4,370 on the same wage. If you bill both out at the same rate, you are quietly losing money on the higher-risk role. That is exactly why our calculator auto-fills a workers' comp default based on the trade you select — including dedicated entries for machinists and welders — and lets you replace it with your real rate.
How to reduce your workers' comp cost
- Run a safety program. Fewer claims lower your experience mod over time, which compounds year after year.
- Verify your class codes. Being placed in a higher-risk code than your work warrants is a common and costly error.
- Return-to-work programs that bring injured employees back on light duty reduce claim costs.
- Shop your policy. Rates for the same class code vary between carriers; get multiple quotes.
- Audit your payroll basis. Premiums are trued-up against actual payroll at year end; keep clean records so you are not overcharged.