Insurance Terms Glossary:
Plain-English Definitions for Buyers
This glossary defines the insurance terms business and personal buyers actually encounter — from "additional insured" to "waiver of subrogation" — in plain English. Each entry gives a short, practical definition and, where we have one, a link to a fuller explainer, so you can look up an unfamiliar term without wading through a full article.
Actual Cash Value to Conditions
Fourteen terms buyers run into early — how claims get valued, who else a policy protects, and the building blocks every policy is made of.
Actual Cash Value (ACV)
Actual cash value (ACV) is a claim payout method that pays what damaged or stolen property was worth at the time of loss — replacement cost minus depreciation for age and wear. It's common in commercial auto total-loss settlements and in some property policies, and it typically pays less than replacement cost value would for the same item.
Additional Insured
An additional insured is a person or business added to someone else's liability policy so they share in that policy's protection for claims arising from the named insured's work or property — commonly a landlord added to a tenant's policy, or a general contractor added to a subcontractor's. It extends a layer of protection tied to a specific relationship or contract; it doesn't replace the additional insured's own coverage.
Admitted Carrier
An admitted carrier is an insurance company licensed by a state's department of insurance to sell coverage there, which means its rates and forms are filed with the state and its policies are backed by the state's guaranty fund if the carrier becomes insolvent. Most standard business and personal policies — homeowners, standard auto, most commercial lines — come from admitted carriers.
Aggregate Limit
An aggregate limit is the maximum amount a policy will pay for all covered claims combined during the policy period, as opposed to a per-occurrence limit, which caps a single claim. Once claims exhaust the aggregate, no more money is available under that policy for the rest of the term — worth checking across every coverage you carry, not just liability.
Binder
A binder is a temporary, short-term proof of insurance confirming coverage is in effect before the full policy is issued — commonly needed to close on a home, register a vehicle, or start a commercial lease while the paperwork catches up. It's a real, enforceable contract of insurance, just not the final formal policy document.
Broker of Record (BOR)
A broker of record (BOR) letter is a signed document that transfers servicing and commission on an existing policy from one agent or broker to another, without necessarily changing the carrier or policy terms. It's how a business or individual switches who represents them — see our guide on independent vs. captive agents vs. buying direct for how that representation actually works.
Business Owner's Policy (BOP)
A business owner's policy (BOP) bundles general liability and commercial property coverage into a single policy at a lower combined premium than buying each separately, typically for small to mid-size businesses.
Cancellation
Cancellation ends a policy before its scheduled expiration date, initiated by either the carrier (for reasons like nonpayment or misrepresentation) or the policyholder. Carrier-initiated cancellation outside the first weeks of a new policy is usually restricted by state law and requires advance written notice — for both personal and commercial policies.
Certificate of Insurance (COI)
A certificate of insurance (COI) is a summary document showing what coverage a policyholder has in force — carrier, policy number, coverage types, and limits — issued to a third party such as a landlord, client, or general contractor as proof of insurance. A COI reflects coverage as of the date it's issued; it isn't a policy itself and doesn't guarantee the coverage stays in force.
Claim
A claim is a formal request to an insurance carrier for payment or other action under a policy after a covered loss occurs. Filing a claim starts the carrier's investigation and, if the loss is covered, its obligation to pay according to the policy's limits, deductible, and terms.
Coinsurance
In property insurance, coinsurance is a clause requiring you to insure your property to a set percentage of its full value (often 80% or more); insure for less, and the carrier reduces a claim payout proportionally, even on a partial loss. In health insurance, "coinsurance" instead means the percentage of a covered cost you pay after your deductible — the same word means two different things depending on the policy type.
Commercial General Liability
Commercial general liability is the insurance industry's full, formal name for standard general liability (GL) coverage — it isn't a separate line, just the complete name behind the standardized policy forms most carriers build their GL policies from.
Completed Operations
Completed operations coverage, part of a general liability policy, covers claims arising from work you've already finished and left the job site — for example, a contractor sued after tenants report a problem with the work months later. It picks up where "ongoing operations" coverage, for claims during the work itself, leaves off.
Conditions
Conditions are the section of a policy that spells out the duties and procedures both you and the carrier must follow for coverage to apply — how and when to report a claim, cooperate with an investigation, and provide proof of loss. Failing to meet a condition can jeopardize an otherwise-covered claim, even when the loss itself is covered.
Declarations Page to First-Party vs. Third-Party Claim
Nine terms about what's written into the policy itself — and what happens when a risk doesn't fit the standard market.
Declarations Page
The declarations page ("dec page") is the summary page at the front of a policy listing the named insured, policy period, coverages, limits, deductibles, and premium at a glance. It's the fastest way to compare two quotes apples-to-apples — see our guide on how to shop for insurance for what else to line up before comparing.
Deductible
A deductible is the amount you pay out of pocket on a covered claim before the carrier pays the rest, up to the policy limit. Deductibles apply to personal policies (a homeowners or auto claim) and commercial policies alike; a higher deductible generally lowers your premium in exchange for taking on more risk yourself.
Endorsement
An endorsement is a written amendment attached to a policy that changes its original terms — adding a coverage, an additional insured, a new location, or a higher limit mid-term. Endorsements become part of the policy contract and should be reviewed alongside the declarations page, not filed away unread.
Errors and Omissions (E&O)
Errors and omissions (E&O) insurance is another name for professional liability insurance — coverage for claims that your professional advice, service, or work product caused a client financial harm, as opposed to physical injury or property damage. See professional liability below for how it differs from general liability.
Exclusion
An exclusion is a specific cause of loss, activity, or type of damage a policy explicitly does not cover, listed in the policy form. Reading exclusions matters as much as reading what's covered — a policy that looks broad on the declarations page can still carve out exactly the risk you were worried about.
Excess and Surplus Lines (E&S)
Excess and surplus (E&S) lines insurance, also called the non-admitted market, is coverage written by carriers a state permits — but doesn't license — specifically for risks the standard admitted market won't take. Our full guide on admitted vs. excess & surplus insurance covers the guaranty-fund trade-off and when buyers end up here.
Experience Modification Factor (E-Mod)
The experience modification factor (e-mod) is a number, centered on 1.0, that adjusts a business's workers' compensation premium up or down based on its actual claims history compared with similar businesses in its class. An e-mod below 1.0 lowers premium and above 1.0 raises it — one of the few rating factors an employer can influence directly through safety and claims management.
FAIR Plan
A FAIR Plan (Fair Access to Insurance Requirements plan) is a state-created insurer of last resort that provides basic property coverage to homeowners and businesses who can't find a policy in the standard or E&S market — typically because of wildfire, coastal, or other catastrophe exposure. FAIR Plan coverage is usually more limited and more expensive than standard property insurance, and is meant as a backstop, not a first choice.
First-Party vs. Third-Party Claim
A first-party claim is one you file against your own policy for your own loss — your car, your building, your business income. A third-party claim is one someone else files against your liability coverage because your business or activity allegedly caused them harm. The distinction determines which part of your policy responds, and who the carrier is actually protecting.
General Liability to Loss History / Loss Run
Eight terms about coverage structure, market cycles, and the paperwork underwriters actually price a risk on.
General Liability (GL)
General liability (GL) insurance covers third-party claims of bodily injury, property damage, and advertising injury against a business — typically the first commercial policy any business carries, and often required by leases, contracts, and lenders.
Guaranty Fund
A guaranty fund is a state-run backstop, funded by assessments on admitted carriers, that pays covered claims (up to statutory limits) if a licensed insurer becomes insolvent. Guaranty fund protection applies to admitted policies only — it does not extend to excess and surplus lines coverage.
Hard Market / Soft Market
A hard market is a period when carriers raise prices, tighten underwriting standards, and pull back from certain classes or exposures — often after heavy industry-wide losses. A soft market is the opposite: more competition, more available capacity, and flatter or falling prices. These cycles move industry-wide, largely independent of any one policyholder's own claims history.
Inland Marine
Inland marine insurance covers property that moves — goods in transit, contractors' tools and equipment, or specialized property that doesn't fit standard property forms — despite the nautical-sounding name, a holdover from when the coverage extended ocean marine insurance onto land.
Insuring Agreement
The insuring agreement is the section of a policy stating, in broad terms, what the carrier promises to cover and under what conditions — the foundation the rest of the policy (definitions, exclusions, conditions) narrows and clarifies. It's the starting point for reading any policy, regardless of which coverage type it's written on.
Lapse
A lapse is a gap in coverage that occurs when a policy ends — usually from nonpayment or a missed renewal — and isn't replaced before the next loss. Beyond the immediate risk of being uninsured, a lapse can make coverage harder or more expensive to obtain afterward, since carriers often ask about prior lapses on new applications.
Limit
A limit is the maximum amount a policy will pay for a covered loss, whether stated per occurrence, per claim, or as an aggregate across the policy period. Limits are chosen when you buy the policy and directly cap what you can recover, regardless of how large the actual loss turns out to be.
Loss History / Loss Run
Loss history is a policyholder's record of past claims; a loss run is the formal report — usually covering five years — that a current or prior carrier provides showing those claims by date, cause, and amount. Underwriters use loss runs to price a risk and decide whether to offer coverage at all, which is why gathering them early is one of the first steps in shopping for a new policy.
Named Insured to Rider
Twelve terms about who a policy protects, how coverage triggers, and what drives what you pay.
Named Insured
The named insured is the person or business specifically identified on the declarations page as the policyholder — the party with full rights under the policy, including the ability to make changes, cancel, and receive claim payment. Other parties, like an additional insured, may share in the policy's protection without holding these rights.
Non-Admitted Carrier
A non-admitted carrier is an insurance company permitted, but not licensed, to write coverage in a given state — another name for an excess and surplus (E&S) lines insurer. Non-admitted carriers can price and write coverage more flexibly than admitted ones, but their policies aren't backed by the state guaranty fund.
Non-Renewal
Non-renewal is a carrier's decision not to offer a new policy term when the current one expires, as distinct from cancellation, which ends a policy mid-term. Non-renewal is common after a change in a carrier's appetite — a wildfire rescore, a claim, or a broader pullback from a class of business — and most states require advance written notice, for homeowners and commercial policies alike.
Occurrence vs. Claims-Made
An occurrence policy covers claims based on when the injury or damage happened, even if the claim is filed years later, as long as the policy was in force at the time of the loss. A claims-made policy instead covers claims based on when they're reported, which must happen while the policy (or an extended reporting period) is active — a distinction that matters most for liability lines like professional liability, where claims can surface long after the work was done.
Per-Occurrence Limit
A per-occurrence limit caps how much a policy will pay for damages arising from a single covered incident, regardless of how many claims or claimants result from it. It works alongside the aggregate limit, which caps total payouts across the whole policy period.
Policy Period
The policy period is the span of time — typically 12 months — during which a policy provides coverage, shown on the declarations page as the effective and expiration dates. Coverage generally applies only to losses (or, for claims-made policies, claims) that occur within this window.
Premium
The premium is the amount a policyholder pays, usually annually or in installments, in exchange for the coverage a policy provides. It's driven by the risk being insured, the limits and deductible chosen, and the carrier's own underwriting and pricing — the cost side of the coverage-versus-cost comparison at the center of shopping for any policy.
Primary and Non-Contributory
A primary and non-contributory endorsement means the endorsed party's policy pays first on a covered claim, without seeking contribution from any other policy that might also apply — even one that would otherwise share the loss. It's commonly required in contracts between general contractors and subcontractors, or landlords and tenants, so the protected party isn't dragged into a dispute over which policy pays.
Professional Liability
Professional liability insurance, also called errors and omissions (E&O), covers claims that your professional advice, service, or work product caused a client financial harm — distinct from general liability, which covers physical injury and property damage.
Replacement Cost Value (RCV)
Replacement cost value (RCV) is a claim payout method that pays what it costs to repair or replace damaged property with new property of similar kind and quality, with no deduction for depreciation. It generally pays more than actual cash value for the same loss and is common in commercial property and homeowners policies, though it usually costs more in premium.
Retention
Retention is the amount of a loss a policyholder agrees to absorb before insurance responds — functionally similar to a deductible, but the term shows up more often on larger commercial policies, especially self-insured retentions (SIRs), where the policyholder, not the carrier, handles claims up to that amount.
Rider
A rider is another name for an endorsement — an attachment that adds, removes, or modifies coverage on an existing policy. The term shows up most often on personal lines, such as adding a rider to a homeowners policy to cover a specific piece of jewelry or other valuable item above the policy's standard limit.
Subrogation to Workers' Compensation
Six terms about recovering losses, accessing the specialty market, and how a carrier decides what to write.
Subrogation
Subrogation is a carrier's right, after paying a claim, to pursue the at-fault third party (or their insurer) to recover what it paid out. It's how, for example, your auto carrier gets reimbursed after paying for your damage in an accident that was clearly the other driver's fault.
Surplus Lines Broker
A surplus lines broker is a specially licensed broker or wholesaler authorized to place coverage with non-admitted (E&S) carriers — standard retail agents generally can't access this market directly. Working through a surplus lines broker is a required step, not an option, whenever a risk lands in the E&S market.
Umbrella/Excess Liability
Umbrella and excess liability insurance adds liability limits above your underlying general liability, commercial auto, or employers' liability policies, paying the difference when a serious claim exceeds those primary limits.
Underwriting
Underwriting is the process by which a carrier evaluates a risk — its exposures, loss history, and other factors — to decide whether to offer coverage, on what terms, and at what price. Every policy you're offered has gone through underwriting, whether that review took seconds (personal lines, largely automated) or weeks (complex commercial or E&S risks).
Waiver of Subrogation
A waiver of subrogation is an endorsement in which a carrier gives up its right to pursue a third party for reimbursement after paying a claim — usually because that third party is protected under a contract, like a lease or a construction agreement. It's commonly required between contractors and subcontractors, or landlords and tenants, so one party's insurer can't turn around and sue the other after paying a loss.
Workers' Compensation
Workers' compensation insurance covers medical expenses, lost wages, and rehabilitation costs when an employee is injured or becomes ill because of their job, and is legally required in nearly every state for businesses with employees.
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