What it means
Insurance is traditionally split into two broad families. Property insurance pays for damage to assets you own, while casualty insurance responds to your legal liability towards other people.
General liability, employers liability, professional indemnity, motor liability and workers compensation all sit inside the casualty branch. It matters commercially because liability claims are the ones that can outgrow the business itself.
A warehouse fire has a natural ceiling, being the value of the building and its contents, but an injury claim can run to millions and arrive years after the incident that caused it. That long, open-ended tail is exactly the exposure casualty cover is designed to absorb.
In practice you buy a policy with a per-occurrence limit, an aggregate limit for the whole policy year, and a deductible or excess that you pay yourself on every claim. The insurer usually also takes on the cost of defending you, which in a contested claim can rival the settlement figure.
Whether defence costs sit inside or outside the limit matters far more than a small difference in premium. Two variants catch people out.
An occurrence-based policy responds to incidents that happened during the policy period even if the claim is notified a decade later, whereas a claims-made policy only responds if the claim is reported while that policy is live. Switching between the two, or letting a claims-made policy lapse without buying run-off cover, creates a gap that no insurer will fill after the fact.
Underwriters price casualty cover from payroll, revenue, industry and claims history rather than from the value of your assets. That is why a consultancy with no premises can still face a significant premium: the exposure follows the advice it gives, not the desks it owns.
In practice
Real-world examples.
Example
A regional coach operator renews its motor liability cover and raises the per-vehicle limit after a near-miss on a motorway. Six months later one of its coaches is involved in a multi-car collision, and the casualty policy funds both the injury settlements and the defence lawyers. The finance director's only cash outlay is the $10,000 excess per claim.
Example
A software consultancy wins a contract with a hospital group, and the contract requires $5,000,000 of professional indemnity cover, a casualty line. The consultancy's existing policy stops at $2,000,000, so it buys an excess layer for an extra $14,000 a year rather than lose a $900,000 engagement.
Example
A craft brewery recalls a batch after a bottling fault causes several minor injuries. Its product liability cover, another casualty line, pays the medical settlements and the associated legal fees, while the cost of the destroyed stock falls under a separate property and stock policy.
Formula
Calculation
Insurer payment = the lower of (assessed loss, policy limit), minus the deductible.
A commercial cleaning firm carries general liability cover with a $1,000,000 per-occurrence limit and a $25,000 deductible. A client's timber flooring is ruined during a job and the assessed loss, including the client's legal costs, comes to $340,000.
Step one, compare the loss with the limit: $340,000 is below $1,000,000, so the whole loss falls within cover.
Step two, subtract the deductible: $340,000 - $25,000 = $315,000 paid by the insurer.
Step three, the firm funds the remaining $25,000 from its own cash.
Now take a worse version of the same incident, an assessed loss of $1,400,000. The insurer pays $1,000,000 - $25,000 = $975,000, and the firm is left carrying $1,400,000 - $975,000 = $425,000. The difference between the two outcomes, $400,000, is the price of choosing a $1,000,000 limit rather than a higher one.Case study
Seen in the real world.
The following is an illustrative, entirely fictional example. Harborline Scaffolding, a mid-sized contractor with $18,000,000 of annual revenue, had carried the same $1,000,000 general liability limit for eleven years without reviewing it. Its broker described the cover as adequate, and nobody in the finance team had reason to look further.
A section of temporary walkway failed at a retail site, injuring two members of the public. The combined settlement and defence costs reached $1,650,000. The insurer paid $975,000 after the $25,000 deductible, and Harborline had to fund $675,000 from its overdraft, wiping out most of a year of profit.
In the review that followed, the company found that raising the limit to $5,000,000 would have cost roughly $9,000 more a year. Eleven years of that premium would have totalled about $99,000, against a $675,000 loss. The board now sets liability limits against a worst-case scenario rather than against last year's renewal notice.
Watch out
Common mistakes.
- Assuming a general business insurance package automatically includes every casualty line, when professional indemnity, product liability and employers liability are frequently sold separately.
- Comparing quotes on premium alone and missing that one policy pays defence costs inside the limit, which quietly reduces the money available to settle a claim.
- Cancelling a claims-made policy when a business closes or a service line is retired, leaving no cover for claims that surface afterwards.
Questions
People also ask.
What is the difference between casualty and property insurance?
Property insurance pays for damage to assets you own, while casualty insurance pays for your legal liability to other people.
Does casualty insurance cover deliberate acts?
No, insurers exclude intentional harm and criminal conduct, because the whole idea rests on covering accidents rather than choices.
How is the premium worked out?
Underwriters use revenue, payroll, industry risk and your claims record over the past three to five years, then adjust for the limits and deductible you choose.
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