AM Best, Fitch, and S&P Global have each published a 2026 US P&C outlook, and all three land on a combined ratio in the 96% to 98% range, up 2 to 4 points from 2025. The agencies use different methodologies and different samples. The interesting part is not that they agree on direction but what the 2025 baseline they are measuring against actually contained.

Key Takeaways

  • 96.9% at AM Best, 96% to 97% at Fitch, 96% to 98% at S&P, against a 2025 estimate ranging from 93.9% to 95.0% depending on the source.
  • $18 billion of favorable prior-year development through the first nine months of 2025, nearly double the roughly $9 billion released in all of 2024, concentrated in short-tail lines.
  • 30 consecutive quarters of double-digit personal auto rate increases ended in March 2025, and rate changes had reached flat by January 2026.
  • $62 billion of cumulative adverse development on commercial liability over the past decade, with $8.6 billion in other liability and $3.8 billion in commercial auto from 2024 reviews alone.
  • Portfolio yields rising to 4.2% in 2026 from 3.9% in 2024, which raises the combined ratio a carrier can tolerate before competitive pricing triggers correction.

Three Forecasts and the Baseline They Measure Against

Metric AM Best Fitch S&P Global
2025 Combined Ratio (est.) 95.0% ~94% 93.9% (9-month)
2026 Combined Ratio Forecast 96.9% 96%-97% 96%-98%
Year-over-Year Change +1.9 pts +2 to 3 pts +2 to 4 pts
2025 Premium Growth 6.1% ~5% ~5%
2026 Premium Growth Forecast 4.0% 3%-4% 5%-6%
Sector Outlook Cautious Neutral Stable

The direction is unanimous and the magnitude nearly so. Divergence sits in two places. On premium growth, S&P projects 5% to 6% against AM Best's 4.0% and Fitch's 3% to 4%, a gap that likely reflects a broader sample including smaller carriers where exposure rather than rate drives premium. On tone, AM Best is explicitly cautious, Fitch neutral, S&P stable, describing the same arithmetic.

What makes the deterioration arithmetic rather than forecast is the composition of 2025. Triple-I and Milliman put the full-year net combined ratio at 92.9%, the lowest in over a decade against 96.6% in 2024, with net underwriting income of $63 billion after $23 billion in 2024 and a $22 billion loss in 2023.

Three things produced it, and each reverses. Catastrophe losses contributed 7.6 points against 8.8 in 2024, on a hurricane season that largely spared the US coastline. Personal auto reached peak rate adequacy after 30 consecutive quarters of double-digit increases ending March 2025, taking the segment to roughly 92% from 95.3% in 2024 and 109.9% in 2023, and rate changes had reached flat by January 2026. And $18 billion of favorable prior-year development, nearly double the roughly $9 billion of 2024, reduced the reported ratio by about 2 points against accident-year performance.

The Gap Between Loss-Cost Trend and Earned Rate

Loss-cost trends across most P&C lines run 6% to 8%. Premium rate changes run 0% to 5%. That gap is the whole forecast, and it is composed of movements that operate independently of the pricing cycle.

Tariffs at 25% on imported vehicles from April 2025 and imported parts from May 2025 are reaching claims with a six to twelve month lag. With over 40% of US auto parts sourced from Mexico, the estimated effect is roughly 2.7% on auto repair claims costs, on top of motor vehicle repair prices already up 10% year over year and used car prices up 4%. Workers' compensation medical severity runs near 5% on physical therapy and specialty pharmacy.

Social inflation is the larger number. US insurers have added $62 billion of adverse development to commercial liability lines over the past decade, and 2024 reviews alone produced $8.6 billion in other liability and $3.8 billion in commercial auto. That is the cost of the 2015 to 2019 soft market emerging, and it is the reason the aggregate reserve picture reads better than the line-level one.

The bifurcation is what makes an aggregate reserve adequacy test unreliable here. The $18 billion of 2025 releases sits in property and auto physical damage, where claims closed faster and cheaper than expected. Casualty continues to develop the other way. An industry-level favorable position therefore coexists with adverse movement in exactly the lines that drive the tail of the reserve distribution, and netting the two produces a number that describes neither.

The same applies to rate indications. A carrier writing predominantly personal auto faces roughly 2 points of deterioration. A mid-market commercial writer concentrated in general liability and commercial auto faces 4 to 6. General liability posted the highest third-quarter direct incurred loss ratio in at least 25 years and a full-year combined ratio above 100%, while commercial property rates fell 25% to 30% on shared and layered placements. Anchoring a line indication to an aggregate industry forecast averages across cycles that are moving in opposite directions, which the social inflation development adjustment is one way to reflect on the reserving side.

Investment Income Raises the Threshold for Correction

Swiss Re Institute projects US P&C portfolio yields rising to 4.2% in 2026 from 3.9% in 2024 as bonds bought during the low-rate period reinvest. Q1 2026 results show the size of it: Travelers reported $833 million of after-tax net investment income, Chubb $1.71 billion pretax, AIG $915 million adjusted, each up 8% to 10%.

That cushion changes carrier behavior rather than carrier results. A portfolio returning above 4% lets a carrier run several points above a 100% combined ratio and still clear its cost of capital, which raises the combined ratio at which competitive pricing becomes intolerable. The correction mechanism that normally ends a soft phase is delayed by the same yields that make the current phase comfortable. Fitch has industry ROE falling from 10.1% in 2025 to 9.1% in 2026; Triple-I traces a longer path from 15% in 2025 to 12% in 2026 and 10% in 2027.

Capital supply extends it further. Policyholders' surplus reached $1.2 trillion as of September 2025, up 24% over three years, against a net written premium to surplus ratio of 0.8x. Total reinsurer capital stands at $785 billion with $136 billion of ILS capacity, and AmWins counts 6 new domestic carriers and MGAs, 7 new Lloyd's syndicates, and 6 new Bermuda operations slated for 2026. Prior hard-market turns were triggered by capital destruction. There is no mechanism here to destroy capital that is still arriving.

The exposure is that both supports depend on rates staying where they are. If the Federal Reserve continues cutting, new-money yields compress and the portfolio tailwind weakens on a lag, arriving at the point where competitive pressure is at its most intense and earned rate is at its furthest below loss-cost trend. The last comparable three-agency convergence, in 2015 and 2016, was followed within 18 to 24 months by casualty reserve development as soft-period rate inadequacy emerged. That cycle at least had a capital constraint waiting at the end of it.

Further Reading

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