Workers Compensation Insurance for Contractors 2026: Costs, State Requirements, Audit Rules
Workers comp costs for contractors in 2026, worked out from the loss costs and rates states actually publish. Class codes that decide your premium, which states require coverage and when, how your experience modifier (E-Mod) works, audit-proofing your books, ghost policy rules for solos, and what to do if a claim happens.
Workers compensation insurance is the biggest insurance cost most contractors will ever pay, and in 2026 it can be worked out from the figures states publish. A 3-person roofing crew in Missouri with $150,000 of payroll pays roughly $22,800 a year (class 5551 loss cost $10.136 per $100, effective January 1, 2026, times a typical carrier loss cost multiplier of about 1.5).
A one-employee electrical shop in Ohio with $55,000 of payroll pays about $600 at the 2026 Ohio BWC base rate for class 5190 ($1.0889 per $100), before assessments. A 10-person California HVAC company with $800,000 of payroll in class 5187 pays about $21,900 at the September 1, 2026 WCIRB pure premium of $2.732 per $100.
Coverage is required in almost every state, but many states start at 3, 4 or 5 employees and several drop to 1 for construction; Texas lets private employers opt out, and Wyoming requires coverage for construction through its monopolistic state fund. The core formula: premium equals payroll divided by 100, times the rate for your class code (in loss cost states, the loss cost times the carrier multiplier), times your experience modifier.
This 2026 guide explains how premiums are calculated, published 2026 loss costs for common contractor class codes, a state-by-state roofing cost comparison, coverage requirements and owner rules by state, how the experience modifier (E-Mod) works, how to survive the annual audit, ghost policy rules for solos, and what to do when a claim happens..