The Policy Type That’s Quietly Disappearing
A monoline commercial auto policy, coverage written on its own rather than bundled with property, general liability, or another line, used to be a straightforward ask for a business that only needed vehicle coverage. That is getting harder to find, and the reason is not a mystery once the loss data behind the line is laid out.
What follows is the same underlying data behind a carrier’s growing reluctance to write the line alone, read as a market-structure story rather than a raw statistics table.
Fourteen Straight Years of Losses Is the Whole Story
Commercial auto is reported to have posted a $4.9 billion underwriting loss in 2024, its 14th consecutive year of losses. Claim severity on the line is reported to have risen 93.5% between 2015 and 2024, even as claim frequency has fallen since the pandemic, and AM Best is reported to project the line remains under-reserved industry wide by $4 billion to $5 billion.
Fourteen consecutive years rules out a single bad year or a temporary catastrophe spike as the explanation. Whatever is driving carrier behavior on this line, it is a sustained pattern, not a blip pricing will simply correct on its own next renewal cycle.
The Only Two Lines Still Underwater Industry Wide
Triple-I’s own January 2026 analysis states that general liability and commercial auto are the only two major commercial lines forecast to stay above a 100 net combined ratio for 2025, the threshold marking an underwriting loss before investment income. Every other major commercial line, property included, is forecast to sit below that line for the same period.
Commercial auto is not just having a rough year relative to itself, it is one of exactly two major lines still losing money on an underwriting basis while the rest of the commercial market has largely returned to profitability.
What Bundling Buys a Carrier
This is reasoning, not a separately cited statistic: a monoline auto account gives a carrier zero diversification against a line that has run structurally negative for fourteen years straight. Bundling that same auto exposure with property, general liability, or another line lets the carrier underwrite a blended account, where a profitable line can offset the persistent loss on auto, instead of taking a bet purely on the line that has lost money every year since before most current underwriters started their careers.
From the carrier’s side, that is not a punitive decision, it is a rational response to fourteen years of data pointing the same direction.
This Isn’t the Same Thing as Cross-Selling an Existing Account
VA Horizon’s own guide on cross-selling and account rounding covers a related but distinct idea in its Monoline Audit section, reviewing an existing client’s account at renewal to identify coverage gaps worth rounding out. That is a producer-driven, existing-account exercise. What this piece describes is different: a carrier’s underwriting appetite for a brand-new, standalone auto submission, decided before the account exists on the agency’s book at all.
Both point toward the same practical outcome, an account that carries more than just auto coverage tends to be an easier account to place and keep, but they are answering different questions from different sides of the desk.
What This Means for a Producer Pitching a Monoline Auto Prospect
Practitioner guidance, not a cited statistic: a producer working a prospect who only wants auto coverage should expect fewer standalone quotes to come back and more markets asking for at least one additional line attached before they will bind. Setting that expectation with the prospect early, rather than after two or three markets have already declined the monoline submission, keeps the conversation from stalling on a surprise.
Framing the ask as “let’s see what else we can round into this” from the first conversation, rather than as a late pivot after a decline, tends to land better with a prospect who came in expecting a single, simple auto quote.
Sources
The external data in this article draws on the sources below. Figures described in the text as estimates or industry triangulations are directional and are not attributed to a single dataset.
- Risk and Insurance, Commercial Auto Insurance Losses Hit $4.9 Billion as Legal System Abuse Drives Severity Beyond Pricing Gains
- Triple-I (Insurance Information Institute), Resilient U.S. P/C Market Performance Sets Stage for a Complex 2026