National Casualty Company’s average rate increase by +5.97% — effective 9/1/2026
09/16/2026
National Casualty Company has filed new California workers’ compensation base rates with the California Department of Insurance for policies effective September 1, 2026.
How are average rates changing?
| Issuing Company | Average Rate
9/1/2025 | Average Rate
9/1/2026 | % Change |
|---|
| National Casualty Company | 8.37 | 8.87 | +5.97% |
*Average rate calculation does not include per capita or per race rates (7707 – Firefighters – volunteers, 7722 – Police, Sheriffs – volunteers, or 8278 – Jockeys).
Does the average change apply to every policy?
Not necessarily. A carrier’s average rate change provides useful context, but individual class rates may move differently. The effect on a specific policy depends on the classifications and exposures involved.
The examples below show how some of National Casualty Company’s individual advisory rates are changing compared with the prior policy period.
| Class – Description | Advisory Rate
9/1/2025 | Advisory Rate
9/1/2026 | % Change |
|---|
| 8389 - Auto/Truck Repair Facilities | 5.70 | 6.32 | +10.88% |
| 9080 - Restaurants – full service | 4.94 | 5.43 | +9.92% |
| 8834 - Physicians’ Practices/Outpatient Clinics | 1.79 | 1.88 | +5.03% |
| 3632 - Machine Shops | 5.17 | 5.07 | -1.93% |
| 40 - Vineyards | 7.32 | 7.14 | -2.46% |
| 8391 - Auto/Truck Dealers | 4.72 | 4.40 | -6.78% |
What does this mean for an individual account?
The average rate increase is only a starting point. To understand the potential effect on a specific policy, review the applicable classifications and compare how those rates changed.
With WorkCompare, users can generate a Pre-Quote Estimate to evaluate how current rate changes may affect potential pricing before formal quotes arrive.