The US P/C underwriting gain reached $60.9 billion in 2025, up sharply from $22.1 billion the year before and the strongest annual result the sector has posted in a decade, according to AM Best. The industry-wide combined ratio improved 3.7 points to 92.2, but the rebound is lopsided: personal lines profit nearly quadrupled while commercial auto booked its fourteenth consecutive year in the red, and reinsurance pricing is already retreating heading into 2026.
Homeowners and auto swing from red ink to record profit
Personal lines carried the 2025 turnaround almost single-handedly. AM Best’s July 2026 market segment report shows the segment’s underwriting profit nearly quadrupled to more than $45 billion for the year. Homeowners multiperil supplied the sharpest swing, moving to $16.8 billion of net underwriting income in 2025 after a $1.5 billion loss in 2024. Private passenger auto, the largest personal line by premium, roughly doubled its result to $28.9 billion in 2025 from $13.8 billion a year earlier.
AM Best’s David Blades credited the shift less to rate hikes alone than to insurers’ growing use of “technology and data analytics” across underwriting, claims handling and ratemaking on both personal auto and homeowners books. That mirrors a broader carrier trend toward in-house modeling capacity, echoed in how Travelers built its own proprietary underwriting model instead of buying one off the shelf, a bet that has coincided with sector-leading combined ratios well below the personal lines average.
Commercial auto’s losing streak grinds on
Commercial lines overall also improved, with underwriting income more than doubling to $19.2 billion in 2025. But that headline masks a persistent problem child: commercial auto stayed unprofitable for the year, narrowing its loss to about $1.9 billion from $4.9 billion in 2024. The line also absorbed roughly $2.0 billion of adverse reserve development in 2025, concentrated in the 2023 and 2024 accident years, meaning insurers are still discovering that older claims cost more than originally booked.
AM Best’s Christopher Graham singled out casualty lines, specifically commercial auto liability and other liability occurrence coverage, as remaining under pressure from reserve strengthening and rising claims severity. AM Best points to social inflation, aggressive plaintiff litigation tactics and the spread of third-party litigation funding as forces that are likely to keep weighing on casualty results into 2026. Specialty and commercial-lines carriers have responded partly through consolidation, a dynamic visible in Sompo’s move to acquire a US workers’ compensation specialist as insurers hunt for scale in lines where organic pricing power has limits.
The reinsurance tailwind is already fading
Behind the primary market’s 2025 result sits a reinsurance market that had hardened for several years and is now loosening its grip. Guy Carpenter data show US property-catastrophe reinsurance rates fell 12% at the January 1, 2026 renewal, as an influx of reinsurance capital drove an accelerated softening in pricing. Europe moved further and faster, with property-catastrophe rates there down 15% at the same January 2026 renewal, compared with the 12% decline seen across the US and Asia-Pacific.
Cheaper catastrophe reinsurance helped cut the 2025 cat load to 7.6 points of the combined ratio, down from an estimated 8.8 points in 2024, and it freed up capital that flowed straight into policyholders’ surplus, which climbed 11.4% to about $1.2 trillion by year-end. The softer renewal, detailed in Guy Carpenter’s January 2026 renewal commentary, is exactly the kind of pricing relief that historically flows back into primary rates within a few quarters, which is why underwriters are treating 2025 as a peak rather than a new baseline. Early 2026 activity has already tracked that shift, with carriers reporting a first-quarter underwriting gain that leaned on pricing discipline rather than catastrophe luck.
Two years erase three years of losses
Zoomed out, the scale of the reversal is striking. AM Best’s March 2026 “First Look” report pegged the 2025 combined ratio improvement at 3.7 points to 92.2 and the underwriting gain at $60.9 billion. AM Best’s follow-up July 2026 report frames that swing against the sector’s recent history: insurers generated a combined $84 billion in underwriting gains across 2024 and 2025, after absorbing $51 billion in underwriting losses from 2021 through 2023. Both documents, the March First Look on full-year 2025 results and the July report on the line-by-line breakdown, point to the same conclusion: rate increases taken during the hard market, combined with fewer catastrophe surprises and softer reinsurance costs, converged in the same twelve months. Whether that convergence repeats in 2026 is now the open question, given that two of its three tailwinds, cheap reinsurance and benign catastrophe experience, are already showing signs of reversing.
The next renewal season looks very different
For brokers and cedents, the practical takeaway is timing. A property-catastrophe reinsurance market that softened 12% in the US at the January 1, 2026 renewal, and 15% in Europe, gives primary carriers less cover for further rate increases on the personal lines that just produced most of the industry’s gain. If cheaper reinsurance and a lighter catastrophe load, 7.6 points of the 2025 combined ratio versus 8.8 points the year before, were two of the three engines behind the sector’s best year in a decade, only rate discipline on the underlying book is fully within an insurer’s control once reinsurance capacity turns.
Reinsurers, meanwhile, face the opposite calculus: a bigger capital base chasing the same risk pool tends to compress margins even as primary companies still book strong results on paper. Regulators and analysts tracking policyholder surplus, up 11.4% to about $1.2 trillion, will be watching whether that cushion gets deployed into further price competition on personal auto and homeowners, or held back given how exposed commercial auto and other liability lines remain to reserve deficiencies. Either way, the consensus emerging from AM Best’s own commentary is that 2025 should be read as a cyclical peak rather than a new floor for underwriting margins.
