On October 1, 2026, the Insurance Information Institute (Triple-I) and the Casualty Actuarial Society (CAS) published a joint analysis finding that motor vehicle tort filings reached their highest level in three decades in 2024: 6,809 federal filings, the most in a dataset stretching back to 1995. The report, Motor Vehicle Tort Litigation Continues to Outpace Claims Frequency, estimates $43.84 billion in excess litigation value embedded in U.S. auto liability costs from 2015 to 2024, equal to roughly 25.3% to 30.5% of the $143.6 billion to $173.1 billion in total auto liability cost inflation the two organizations previously estimated for the same period.
The number that should stop a finance leader reading past the headline is not the dollar figure. It is the divergence. From 2014 to 2024, federal motor vehicle tort filings grew at a compound annual growth rate of 5.0% while total federal civil case frequency declined at 0.9% per year from 2015 through 2024. Adjusted for the size of the economy, motor vehicle tort filing frequency rose 4.5% annually while the rest of the federal civil docket shrank. Litigation is growing five times faster than the court system around it, and the report’s central point is that this growth is not explained by crash frequency, which has generally declined.
Who it affects
Self-insured trucking and logistics fleets, delivery operations, transit authorities, and public-entity motor pools carry the exposure most directly, because they retain bodily injury (BI) liability at the layer where litigation costs actually land. Single-parent captives and group captives writing commercial auto, and any excess or umbrella program sitting above a self-insured retention (SIR), face the same pressure one layer up. The trend holds in both liability frameworks: from 2015 to 2024, federal motor vehicle tort filings grew at a 4.6% CAGR in no-fault states and 6.2% in tort states, so no fleet’s venue mix fully insulates it, though tort-state concentration is the sharper signal.
The reserve mechanism: severity decoupled from frequency
Most commercial auto severity assumptions are built, explicitly or implicitly, on a frequency base: crash counts, miles driven, or police-reported accident rates, with a severity trend layered on top. This report documents that the litigation layer is now moving independently of that base. When lawsuit volume grows 5% a year while underlying claims frequency is flat or falling, the average cost per closed claim rises for reasons a frequency-indexed model will never capture.
The prior joint CAS and Triple-I work quantified how large that wedge has become for commercial auto specifically: legal system abuse and related litigation trends contributed an estimated $52.0 billion to $70.8 billion to commercial auto liability losses over the past decade, or 22.6% to 30.8% of booked losses, the highest share of any line studied. That analysis also noted that loss development factors (LDFs), the actuarial measures of how claim costs evolve after the accident year closes, have generally increased since 2008.
The disposition data in the new report explains why the tail lengthens rather than just steepens. Approximately 52.4% of disposed motor vehicle tort cases from 2015 to 2024 settled, more than double the 24.2% settlement rate for civil cases overall, while only 7.1% ended in a judgment. The cost driver is not primarily verdicts; it is a larger volume of cases moving through a settlement process at rising values. Average plaintiff awards in federal motor vehicle tort judgments rose from $377,000 in 1995-2004 to $681,000 in 2015-2024, an increase of roughly 81% across the two decade windows. Cases that settle late and high develop differently from cases that settle early, which is precisely what a tail factor is supposed to capture. If your tail factor was selected before litigation volume decoupled from crash frequency, it is priced for a world that no longer exists.
For context on where the insured market sits: commercial auto posted a $4.9 billion underwriting loss in 2024, its 14th consecutive year of losses, with a commercial auto liability loss and loss adjustment expense ratio of 87.6, the highest in 11 years, according to AM Best figures cited in coverage of the report. Self-insureds do not book underwriting results, but they share the loss experience underneath them.
Where this shows up in your reserves
Open your most recent commercial auto reserve analysis and look at three places. First, the paid and incurred development triangles for commercial auto bodily injury: if accident years 2021 through 2024 are developing past where the selected age-to-age factors predicted, that is the litigation wedge surfacing, and it shows up as adverse development on recent years rather than as a trend error you can average away. Second, the tail factor on the BI triangle: compare the selected tail against one tested for a scenario where case duration keeps extending, since the settlement-heavy disposition mix means more claims stay open longer at higher values. Third, the severity trend assumption itself: ask whether your actuary’s trend selection separates a litigation-volume component from a pure claims-frequency component, or whether both are bundled into one factor. The report’s own estimate that litigation accounts for roughly a quarter to nearly a third of auto liability cost inflation suggests the bundled approach leaves real money on the table. If you run a captive, the same triangle sits behind your funding and confidence-level analysis, and an understated tail understates the capital the captive needs. Our commercial auto and fleet IBNR guide walks through the triangle mechanics, and our reserve diagnostic guide covers the leading indicators worth checking between formal studies.
We have flagged pieces of this pattern before: nuclear verdict data setting a new severity floor for reserving, and fleet tail factors drifting stale as verdict medians climb. What this report adds is the frequency side of the ledger, and the finding that litigation volume is outrunning claims themselves. That combination, more claims per claim, at higher values, settling later, is what distinguishes this cycle from ordinary severity trend.
What this means for your next review
Put three items on the agenda for your next reserve study or interim monitoring meeting. First, ask your actuary for a litigation-adjusted severity trend run alongside the standard selection, so the difference is visible rather than absorbed. Second, request a tail factor sensitivity test on the BI triangle under an extended-duration scenario. Third, ask whether your venue mix, no-fault versus tort states, is weighted explicitly in trend selection, given the 4.6% versus 6.2% growth gap the report documents. Watch next for the 2025 federal filing data from the Administrative Office of the U.S. Courts to confirm whether the divergence continued, and for state-level litigation funding disclosure rules, which several states have already moved on, to shift the venue math.
Decision-maker checklist
- Ask your actuary whether the BI severity trend separates litigation-volume growth from claims-frequency trend, and request a side-by-side run of both selections.
- Test the commercial auto tail factor against an extended case-duration scenario before the next funding decision.
- Review paid development on accident years 2021 through 2024 in the BI triangle for emergence beyond selected factors.
- Map your fleet’s claim geography against the no-fault versus tort state growth gap and confirm your TPA flags state of jurisdiction at the claim level.
- If you sit above an SIR or inside a captive, confirm the excess layer’s limit adequacy assumes the litigation wedge, not just CPI-indexed severity.
An independent reserve review brings a second pair of eyes that’s free of the TPA’s or fronting carrier’s incentive structure. We’re working on a directory of independent reviewing actuaries. If you’d like to be considered, get in touch.
Sources
- Triple-I/CAS Analysis Finds Motor Vehicle Tort Filings Reach 30-Year High (Business Wire, Oct. 1, 2026)
- Casualty Actuarial Society: New CAS and Triple-I Analysis Quantifies Impact of Legal System Abuse on Liability Insurance Losses
- Insurance Business: Motor vehicle tort filings hit 30-year high as lawsuits outpace accidents (Oct. 2, 2026)
- Triple-I: Behind the Wheel of Legal Inflation, More Than $42.8B in Excess Auto Tort Cases (Sept. 4, 2025)