What it means
Liability insurance comes in several distinct forms, each aimed at a different way a business can end up owing someone money. Public liability covers injury or property damage to third parties, employers' liability covers staff injured at work, product liability covers harm caused by what you sell, and professional indemnity covers financial loss caused by your advice or services.
It matters because a single liability claim can be larger than a small business is worth. Legal defence costs alone can run into six figures even when a claim eventually fails, and the insurer's obligation to fund that defence is often more valuable in practice than the payout itself.
The commercial mechanics revolve around three numbers: the premium you pay, the limit of indemnity, which is the most the insurer will pay, and the excess or deductible, which is the first slice of any claim you fund yourself. Raising the excess lowers the premium, which is a genuine trade between certain small cost and uncertain large cost.
Cover is usually written on one of two triggers, and the difference matters more than most buyers realise. An occurrence policy responds to incidents that happened during the policy period whenever the claim is made, while a claims-made policy responds only to claims notified during the policy period, which is why professionals who switch insurers often need run-off cover.
Two nuances repeatedly cause problems. First, limits may apply per claim or in the aggregate for the whole year, and a policy with a $2,000,000 aggregate can be exhausted by two large claims.
Second, many contracts and landlords specify minimum cover levels, so the amount you buy is often a commercial requirement rather than a purely risk-based choice.
In practice
Real-world examples.
Example
A scaffolding contractor drops a clamp onto a parked car. Public liability cover pays the $9,000 repair bill less the $1,000 excess, and more importantly funds the legal response when the owner claims for a neck injury as well.
Example
An architecture practice is sued after a specification error causes a client to rebuild a roof. Professional indemnity cover meets the $340,000 remedial cost and the defence fees, which alone reached $70,000.
Example
A drinks brand recalls a batch after a bottling fault causes glass fragments. Product liability responds to the injury claims, while the cost of the recall itself falls to a separate product recall policy the company had not bought.
Think of it
“Liability insurance pays when you're responsible for harm-protection from lawsuits.
Formula
Calculation
Insurer Pays = Minimum of (Covered Loss - Deductible) and Policy Limit
Business Pays = Total Loss - Insurer Pays
A catering company holds public liability cover with a $1,000,000 limit per occurrence and a $25,000 deductible. A guest is injured when a serving unit collapses, and the settled claim plus legal costs totals $850,000.
Insurer Pays = $850,000 - $25,000 = $825,000, which is below the $1,000,000 limit
Business Pays = $850,000 - $825,000 = $25,000
Now take a worse outcome. If the total claim were $1,400,000, the insurer would pay its $1,000,000 limit and the business would fund $1,400,000 - $1,000,000 = $400,000 from its own resources, which is exactly the gap that excess liability cover is designed to fill.
On pricing, if the insurer rates this class at $2.50 per $1,000 of turnover and the caterer's revenue is $6,000,000, the base premium is ($6,000,000 / $1,000) x $2.50 = $15,000 a year.Case study
Seen in the real world.
Ashcombe Play Centres is an invented company used only as an illustrative example. It ran three indoor play venues and carried $1,000,000 of public liability cover because that was the minimum its first landlord had demanded eight years earlier, and nobody had revisited the figure since.
A serious injury on a slide led to a claim that settled, with legal costs, at $1,650,000. The insurer paid its $1,000,000 limit and Ashcombe faced a $650,000 shortfall, which it could only meet by selling one of its three sites.
After the event the business restructured its cover: it raised its primary limit to $5,000,000, added an excess layer, and increased its deductible from $5,000 to $25,000 to offset part of the extra premium. In this fictional case the total premium rose by roughly a third while the worst-case exposure fell by an order of magnitude.
Watch out
Common mistakes.
- Choosing a cover limit based on what a contract demands rather than on the worst realistic claim the business could face.
- Assuming liability cover pays for damage to your own premises, stock or equipment, which needs separate property insurance.
- Switching from one claims-made policy to another without arranging run-off or retroactive cover, leaving a gap for past work.
Questions
People also ask.
Does liability insurance cover legal defence costs?
Usually yes, and defence costs are often the larger part of a claim, though check whether they sit inside or on top of the limit.
Is employers' liability optional?
In many jurisdictions it is a legal requirement for any business with employees, with penalties for trading without it.
Will a claim always increase the premium?
Not automatically, but claims history is a major rating factor, so a pattern of claims will usually raise premiums or tighten terms at renewal.
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