US property and casualty carriers are facing a complex transition as the 2026 ISO Commercial General Liability (GL) overhaul brings changes to classification, pricing and governance processes across the industry.
According to an Earnix analysis, the revised plan introduces more than 55 new classifications while consolidating more than 130 existing ones into approximately 60. Updated loss costs are also expected during 2026, alongside a multistate forms revision that will apply to policies written on or after 1 October 2026 in many jurisdictions.
For carriers managing large, multistate commercial books, the changes could affect the entire policy lifecycle. Existing policies must be mapped to the new classification structure, carrier-specific pricing strategies need to be carried forward accurately, and premium impacts must be understood and communicated while adhering to state-specific renewal timelines.
The existing book of business presents one of the biggest challenges. While some classification conversions map directly across, others require underwriter input or additional risk information. This means national carriers face a substantial migration exercise rather than a straightforward technical update.
Understanding premium movement before changes reach the market is also critical. Pricing teams need visibility into where and why premiums shift, whether because of reclassification, updated loss costs, revised exposure treatment or the carrier’s own pricing decisions. An account moving from $42,000 to $49,500 in premium, for example, requires a breakdown of the contributing factors rather than a single top-line figure to support actuarial and underwriting review.
Preserving each carrier’s proprietary pricing strategy, including loss-cost multipliers, tiering, schedule rating and credits or debits, adds another layer of complexity. Manual implementation processes can make it harder to distinguish ISO content from carrier-specific pricing logic over time.
State adoption dates add further pressure. With many existing policies remaining on legacy plans until renewal, carriers may need to run legacy and 2026 rating approaches in parallel. Effective-date management, version control and coordination between teams will therefore become increasingly important throughout the transition.
The GL update is also the first phase of a broader ISO modernisation effort, with Commercial Auto and Property changes expected to follow in 2027. The processes carriers establish for the GL transition could therefore influence how they manage subsequent regulatory and rating changes.
Earnix’s analysis highlights the scale of the transition and the importance of maintaining pricing logic while carriers move between legacy and revised rating structures. Earnix Price-It integrates ISO Electronic Rating Content to help carriers manage the transition, from assessing portfolio impact and preserving pricing logic through to testing and implementation.
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