The financial strain on California’s workers’ compensation insurance market is deepening significantly, according to a newly released comprehensive study. The projected combined ratio for California workers’ compensation insurers reached an alarming 127% in 2025, marking the highest level recorded in more than two decades.

The alarming figure was detailed in the latest Quarterly Experience Report published by the Workers’ Compensation Insurance Rating Bureau of California (WCIRB), which provides a deep dive into insurer experience and market performance through June 30. This soaring combined ratio underscores a prolonged period of severe financial pressure for carriers operating within the state’s workers’ compensation sector.

The new data illustrates that combined ratios have now exceeded 110% for five consecutive years. This extended duration of elevated ratios reflects a persistent and troubling market trend characterized by higher claim frequencies, climbing medical service costs, and increasing loss and loss adjustment expense costs that continue to outpace premium growth.

Despite these compounding financial challenges, written premium figures for the first six months of 2026 showed a modest upward movement, registering 5% higher than the totals recorded during the same period in 2025. Concurrently, the estimated average charged rate for the first half of 2026 ticked upward to $1.64 per $100 of payroll, representing a slight increase from the $1.63 rate recorded across 2025.

To help stabilize the struggling market, California Insurance Commissioner Ricardo Lara took regulatory action in July, approving an average 8.7% increase in advisory pure premium rates that became effective on September 1, 2025. This was followed by an additional approved average increase of 6.6% that took effect on September 1, 2026.

Beneath the headline combined ratio figures, the WCIRB report sheds light on the underlying drivers of claims cost and frequency. The projected loss and allocated loss adjustment expense ratio for accident year 2025 stood at 95%, remaining virtually flat compared to the 94% ratio recorded for accident year 2024. Industry analysts note that these persistently high recent increases are closely associated with climbing average medical and allocated loss adjustment expense costs, compounded by an accelerating frequency of indemnity claims, with cumulative trauma claims playing a particularly prominent role.

The upward trajectory of indemnity claim frequency persisted into the first half of the year, rising to 3.6%. Cumulative trauma claims, in particular, have continued to serve as a primary catalyst for frequency increases across the state since 2022. According to WCIRB data, these specific types of claims have grown substantially, expanding from roughly 18% of all indemnity claims in 2022 to more than 25% in the more recent reporting periods.

When examining the overall financial impact per individual claim, the projected total loss and allocated loss adjustment expense severity for accident year 2025 was calculated at $81,460 per indemnity claim. While this specific severity figure remained unchanged from the levels observed in 2024, it represents an increase of more than 30% when compared to historical benchmarks from 2016. Furthermore, the report highlights that these recent severity figures may actually be understated at this stage because cumulative trauma claims notoriously develop at a much slower pace than traditional injury claims, with roughly 25% of them showing zero medical payments at the 18-month mark.

Additional pressures are visible within the administrative and legal categories associated with claims handling. Allocated loss adjustment expense severity, when calculated independently of medical cost containment program costs, rose by 11% in 2025 to reach $13,860 per indemnity claim. This particular cost category has charted a continuous upward path, increasing in each consecutive year since 2021.

Compounding these administrative and medical burdens, medical-legal costs per claim have experienced a sharp and sustained escalation since 2022. This surge reflects both an increased reliance on medical-legal services and higher average payments demanded per individual service. The report notes that these cost increases have not been distributed evenly across the state, proving to be notably more pronounced for operations and claims originating in Southern California.