How workers comp premiums are calculated in 2026
Workers compensation insurance premiums are calculated per $100 of annual payroll, using class code rates set by NCCI (National Council on Compensation Insurance) or state-specific rating bureaus. The formula is: (Annual Payroll ÷ 100) × Rate × E-Mod = Premium.
Rates vary enormously by risk level. A $250,000 clerical payroll costs roughly $450/year in workers comp; a $250,000 construction payroll costs roughly $21,250/year at the same base rates. High-risk industries like roofing, logging, and demolition can exceed $20–$30 per $100 payroll.
For total employer payroll costs including FICA match, FUTA, and SUTA, see the Employer Tax Calculator. For employee take-home calculations, see the Payroll Tax Calculator.