Why your business insurance premium went up

A premium goes up for one of three reasons, or a mix: you gave the insurer more to insure (exposure), the insurer raised its price per unit of exposure (rate), or your own record changed how it prices you (experience and underwriting). Most owners see only the final number. Splitting it into these three pieces tells you what is negotiable and what is not.

Start with the arithmetic: exposure times rate

Commercial premiums are built on exposure bases, such as payroll for workers' compensation, sales for general liability, vehicles for auto and values for property, multiplied by a rate. When the premium changes, ask the underwriter or broker for the change in each piece, line by line.

Say, hypothetically, a restaurant group pays $40,000 for its package and workers' compensation. At renewal the quote is $46,000, a 15% increase. The owner is annoyed, until the broker shows the pieces: sales and payroll grew 10% because a second location opened, and the rate per unit rose 4.5%. Ten percent more exposure at 4.5% higher rates is 1.10 x 1.045, or about 15%. Only 4.5 points of that increase is a pricing decision the carrier made. The rest is the business growing, and the premium audit would have charged it anyway.

The things on your side of the table

• Growth and inflation in the base. More payroll, higher sales, new vehicles and higher property values all raise premium even at unchanged rates. Values matter most in property: Turner Construction's building cost index rose 8.0% in 2022, 6.0% in 2023, 3.9% in 2024 and 4.1% in 2025 (Turner Building Cost Index). If your carrier trends your building values to keep insurance to value, the premium rises even with a falling rate. Compare that with the real replacement cost; see insurance to value: setting the right building limit.
• A changed class. A change in what you do, or a reclassification at audit, can move you into a higher-rated class code. In workers' compensation, class and state drive most of the price.
• Claims. A large or frequent claim feeds your loss ratio with general liability, auto and property carriers, and your experience mod in workers' compensation. The effect on a mod persists for three policy years in the standard NCCI plan. do claims raise business insurance premiums? covers when a claim moves the premium and when it doesn't.
• Lost credits. Carriers use schedule rating to give discretionary credits and debits within limits set by their filings. A credit for a safety program, a new location layout or good management can vanish if the underwriter no longer sees evidence of it, so keep the documentation current.
• Coverage you added. A higher umbrella limit, a lower deductible, a new additional insured requirement or a cyber endorsement all cost money. An increase caused by your own change is not a rate increase.
• Inaccurate prior estimates. If you underestimated payroll last year, the audit billed the difference, and the new estimate corrects upward. Underreporting does not save money; see premium audits: how they work and how to prepare and insurance applications: why accuracy matters and what misrepresentation costs.

The things on the carrier's side

Pricing is set by line, not by market in general, and 2026 shows it clearly. According to the Council of Insurance Agents & Brokers' second-quarter 2026 survey, commercial property premiums fell an average 6.3% and workers' compensation and cyber each fell 3.2%, but commercial auto rose 4.5% and umbrella rose 5.3%, the 35th consecutive quarterly increase (Insurance Journal, Aug. 20, 2026). Marsh's Global Insurance Market Index reported U.S. casualty rates up 7% and property rates down 13% in the second quarter of 2026 (Marsh). Why the lines diverge:

• Liability severity. Large verdicts, higher medical costs and litigation funding have pushed up claim costs for general liability, auto and umbrella. Marathon Strategies counted 190 corporate verdicts of $10 million or more in 2025, up 40.7% from 135 in 2024 and totaling over $25.6 billion (Marathon Strategies, Aug. 2026). Umbrella and excess carriers bear that severity first, which is why the umbrella line keeps rising while property softens. See nuclear verdicts and social inflation: why liability costs keep rising.
• Commercial auto. AM Best's data, reported in the trade press, showed an underwriting loss of $4.9 billion in 2024, the 14th straight year, and about $1.9 billion in 2025. That history keeps rates and underwriting standards tight. See why commercial auto insurance keeps getting more expensive.
• Workers' compensation. NCCI's 2026 State of the Line report put the private carrier combined ratio at 91 for 2025, up from 86 in 2024, with medical and indemnity severity each up 4% (Insurance Journal, May 14, 2026). That is still profitable, but the cushion is thinner, so rate decreases are shrinking. Your mod and your state's filed loss costs matter more than the national trend.
• Property and reinsurance. Property is getting cheaper because reinsurance capacity is abundant. Guy Carpenter's U.S. property catastrophe rate-on-line index fell 16% over the 2026 renewals through July and sits about 22% below its 2024 peak, per Artemis. A property buyer with a clean record should see that in the quote, unless its location carries wind, hail or wildfire exposure that the carrier is repricing locally. See how reinsurance pricing flows into business insurance premiums.
• Carrier changes of strategy. An insurer that has had poor results in a class, taken reserve charges, been downgraded, merged or changed its appetite will reprice or exit accounts regardless of your record. Nothing you did caused it. Shopping the account is the cure.

How to find out which one hit you

Ask your broker for a written breakdown before you negotiate:

1. Expiring versus renewal premium by line and by location or class.
2. Change in each exposure base, with the underwriter's source for the new figure.
3. Rate change per unit of exposure, and whether it is the carrier's base rate, a filed loss cost change or a schedule rating change.
4. Any credits removed or debits added, and what documentation would restore them.
5. Differences in limits, deductibles, retentions, sublimits, exclusions and conditions.
6. For workers' compensation, the experience mod on the new worksheet and the effect of each ratable claim; the workers' comp premium calculator shows how mod, class and payroll interact.

If the increase is all exposure, there is no case to make beyond checking the numbers. If it is rate with no explanation, you have leverage, and how to negotiate a business insurance renewal covers how to use it. If the underwriter says the market is hard for your class, check that against the broader picture in hard and soft insurance markets: what the cycle means for buyers; "the market" is rarely the same for property and for auto.

What you can do

• Fix the exposure data. Check payroll classifications, subcontractor costs treated as payroll, vehicle lists with sold units still on, and property values that were trended automatically.
• Show the risk improvements. Safety committee minutes, driver monitoring, sprinkler upgrades, new roofs, multi-factor authentication and backup tests all support credits.
• Review the loss runs for errors. Reserves left open on closed claims inflate your loss ratio.
• Move deductibles deliberately. A higher retention can offset a rate increase if your cash can absorb the losses; compare the options with the Total cost of risk (TCOR) calculator.
• Market the account. A carrier that is repricing an entire class may be the outlier. Carriers still quoting your class aggressively will let you see that.

Key takeaways

• Premium change equals exposure change times rate change, plus any shift in your experience credits or coverage; separate them before reacting.
• In 2026 the lines move differently: property, cyber and workers' compensation are falling on average, while commercial auto and umbrella are rising.
• Liability severity and litigation, not your behavior, explain most auto, GL and umbrella increases; your claims and class explain the rest.
• Ask for the breakdown in writing, check the exposure figures for errors, and document risk improvements to win back credits.
• If the carrier is repricing a whole class or changing strategy, the remedy is a marketed renewal, not a better argument.