Industry
What affects commercial coverage premiums
Commercial coverage premiums reflect exposure bases, class codes, claims history, state loss costs, deductibles, limits, coinsurance, and coverage timing.
What to take away
- Commercial coverage premiums come from three inputsan exposure base, a class code rate, and modifiers tied to your claims record and your state.
- Payroll drives workers compensation and employment practices liability; revenue, square footage, and replacement cost drive general liability and property.
- Workers compensation is the one line where state-approved loss costs set the base, so identical shops pay different amounts in Ohio and Texas.
- Deductible, limit, and coinsurance choices move the price faster than switching carriers.
- Loss runs are the only driver that compounds year after year.
The exposure bases behind every quote
Underwriting starts with a number you already report to someone. Payroll drives workers compensation, employment practices liability, and general liability for trades that work at customer premises. Revenue drives general liability for retail, restaurants, and products. Property lines use replacement cost, square footage, or inventory value.
Exposure bases by coverage line
Coverage line
- Workers compensation
- Payroll by class code
- General liability
- Revenue, payroll, square footage
- Commercial property
- Replacement cost, coinsurance %
- Employment practices liability
- Employee count and payroll
- Management liability
- Revenue and total assets
Exposure base
- Workers compensation
- State loss costs, experience mod
- General liability
- Class code, subcontractors, territory
- Commercial property
- Construction, age, protection class
- Employment practices liability
- Turnover, prior claims, state
- Management liability
- Sector, ownership, claims history
Fastest moving factor
- Workers compensation
- General liability
- Commercial property
- Employment practices liability
- Management liability
A 25 employee restaurant and a 6 person consultancy with the same revenue do not price alike, because their exposure bases differ.
| Coverage line | Exposure base | Fastest moving factor |
|---|---|---|
| Workers compensation | Payroll by class code | State loss costs, experience modification |
| General liability | Revenue, payroll, or square footage | Class code, subcontractors, territory |
| Commercial property | Replacement cost and coinsurance percentage | Construction, age, protection class |
| Employment practices liability | Employee count and payroll | Turnover, prior claims, state |
| Management liability | Revenue and total assets | Sector, ownership structure, claims history |
Employment practices liability insurance (EPLI) is rated on headcount and payroll, and claims can allege discrimination, harassment, or wrongful termination. See the employment practices liability overview.
For private companies, management liability factors can include revenue, sector, and claims history, as the directors and officers entry explains.
Class codes and the experience modification
Class codes are assigned by what employees actually do, not by job titles. A supervisor who climbs ladders is rated differently from one who only drives between sites. Wrong codes are a common source of mid-term audit charges.
The experience modification compares your losses with the average for your class. It follows the business rather than the carrier, so changing insurers does not reset it.
General liability rates follow the class code, and the coverage addresses harm to other people and their property. See what counts as third party for the distinction.
State rate filings and the geographic gap
Workers compensation is where state regulation touches price most directly. A rating bureau files loss costs, the state insurance department reviews them, and each carrier applies its own loss cost multiplier. North Dakota, Ohio, Washington, and Wyoming run monopolistic state funds, so no private carrier competes for the base coverage.
Commercial premium by state also reflects litigation climate and catastrophe exposure. In coastal counties, percentage wind deductibles can affect property pricing alongside building characteristics.
That is how commercial coverage rate changes arrive: through filed loss costs and territory factors, not a single national average.
Deductibles, limits, and coinsurance
The deductible is the most direct lever. Moving a property deductible from $1,000 to $10,000 changes the rate on the spot, and a self-insured retention does similar work on liability lines.
Limits behave differently. The price curve between $1M and $2M per occurrence is flat for many small general liability accounts. Property limits are stricter. If insured property values fall short of the policy's coinsurance requirement, a claim payment may be reduced by a coinsurance penalty.
Fix the exposure data first. Shop the rate second.
Loss runs and the claims record
Loss runs are the three to five year claims history your carrier pulls at renewal. For small accounts, frequency hurts more than severity. Three small slip claims suggest a housekeeping problem that one large claim does not.
Request your loss runs before you start comparing quotes. Errors in them are correctable, and a corrected loss run can change what you are offered.
Claims-made timing
Professional liability is written on a claims-made basis. The retroactive date, not the incident date, decides whether a claim is covered. Changing carriers without negotiating prior acts coverage resets your protection.
Before paying the first premium, confirm the retroactive date in writing. Getting professional liability right the first time means protecting the prior acts coverage you need.
Example: one shop, two states
Two machine shops, each with 12 employees and $1.4M in revenue, one in Ohio and one in Texas. The Ohio shop buys workers compensation from the state fund. The Texas shop buys from a private carrier using a filed loss cost multiplier.
Same shop, two states
Ohio shop
- Employees
- 12
- Revenue
- $1.4M
- Workers comp source
- State fund
- Experience modification
- 1.15
- Premium effect
- Higher
Texas shop
- Employees
- 12
- Revenue
- $1.4M
- Workers comp source
- Private carrier
- Experience modification
- 0.85
- Premium effect
- Lower
The Ohio shop's 1.15 experience modification and the Texas shop's 0.85 show how a rating input can differ. Without payroll by class code and the applicable rates, this example does not establish either shop's premium.
