Insurance terms, translated.

These are the terms you’ll meet in policies, applications, and client contracts. For how the coverages fit together, see our coverage guides; for your profession’s specifics, start with the profession guides.

Additional insured

A person or business added to your policy by endorsement so they receive protection under it — typically a client, landlord, or venue that requires it by contract. Being named as additional insured gives them defense rights for claims arising from your work; it does not give them your full coverage.

Admitted carrier

An insurer licensed by the state insurance department and backed by the state guaranty fund. Non-admitted (surplus lines) carriers write risks admitted markets decline, with more rate and form flexibility but no guaranty-fund backstop.

Aggregate limit

The maximum a policy will pay for all claims combined during the policy period. A $1M/$2M policy pays up to $1M per claim and $2M total per year.

A-rated carrier

An insurer graded “A” or better for financial strength by AM Best. The rating measures ability to pay claims — the reason contracts often specify “carriers rated A- VII or better.”

Breach of professional duty

Failure to perform services with the skill and care a reasonably competent member of your profession would use — the negligence standard at the core of most E&O claims.

Certificate of insurance (COI)

The one-page proof-of-coverage document listing your policies, limits, and effective dates. A certificate informs; it does not itself change coverage — endorsements do that.

Claims-made policy

Coverage triggered by when a claim is made against you (and reported), not when the work occurred. Nearly all E&O is claims-made — which is why continuity, retroactive dates, and tail coverage dominate professional liability decisions.

Consent to settle

A policy provision requiring the carrier to get your agreement before settling a claim. Some forms include a “hammer clause” capping the carrier’s exposure if you refuse a settlement it recommends.

Cyber liability

Coverage for data breaches and security events — first-party (your response costs: forensics, notification, restoration) and third-party (claims and regulatory actions from exposed data).

Deductible / retention

The amount you pay before coverage responds. E&O typically uses a self-insured retention (SIR) applying to defense and damages; small-firm retentions commonly run $0–$5,000.

Defense costs

Attorney fees, expert costs, and litigation expenses the policy pays. On most E&O forms, defense spending erodes the limit (“defense inside limits”); some professions can buy defense outside limits.

Duty to defend

The carrier’s obligation to provide and pay for your defense when a claim alleges covered conduct — broader than the duty to pay damages, and for most insureds the most valuable promise in the policy.

Endorsement

A written amendment that changes policy terms — adding an insured, a coverage, a state, or a service. If a promise about your coverage matters, it should exist as an endorsement, not an email.

Errors & omissions (E&O)

The common name for professional liability insurance — coverage for claims that your professional services, advice, or deliverables caused financial loss.

Extended reporting period (tail)

Added time after a claims-made policy ends during which claims from past work can still be reported and covered. Purchased at retirement, sale, or carrier changes without prior-acts coverage; often priced as a multiple of annual premium.

First-party coverage

Insurance that pays your own losses (your data restoration, your lost income), as opposed to third-party coverage, which pays claims others bring against you.

Hammer clause

A consent-to-settle provision limiting the carrier’s payout to what a claim could have settled for if you refuse the recommended settlement — you keep control, but you own the excess risk.

Hold harmless / indemnification

A contract promise to cover another party’s losses from claims connected to your work. Indemnities shift risk on paper; insurance is what funds the promise. Have both reviewed together.

Incident / circumstance reporting

Notifying your carrier of events that could become claims before any demand arrives. Reporting a circumstance locks coverage to the current policy even if the formal claim comes years later — a claims-made survival skill.

Limit of liability

The maximum the policy pays — expressed per claim and in aggregate. Contracts specify the limits you must carry; your risk determines the limits you should.

Media liability

Coverage for content torts — defamation, invasion of privacy, copyright and trademark infringement — arising from material you create or publish. The professional coverage for agencies, creators, and publishers.

Misrepresentation (application)

Inaccurate statements on your insurance application. Material misrepresentation can void coverage entirely — the reason accuracy about services, revenue, and claims history matters more than any premium optimization.

Negligence

Failing to use the care a reasonable professional would in the circumstances. Professional negligence is the central covered allegation in E&O; intent is not required — that is precisely why insurance works for it.

Occurrence policy

Coverage triggered by when an incident happens, regardless of when the claim arrives — the standard architecture for general liability, in contrast to claims-made E&O.

Per-claim limit

The maximum payable for any single claim, including (on most forms) its defense costs.

Policy period

The dates coverage is in force. In claims-made insurance, both the claim and its reporting generally must fall within the policy period (or its extended reporting period).

Prior acts coverage

Coverage for work performed before the current policy began, back to your retroactive date. What makes switching carriers safe when done correctly — and dangerous when it is not.

Professional services (definition)

The policy’s description of the activities it covers — the most important paragraph in an E&O form. Work outside the definition is work outside the coverage; keep it aligned with what you actually do.

Retroactive date

The earliest work date the policy covers. Claims from services performed before it are excluded. Maintaining one continuous retroactive date across renewals and carrier moves is the discipline of claims-made insurance.

Self-insured retention (SIR)

The amount you pay on a claim before the carrier’s obligations begin — E&O’s version of a deductible, typically applying to defense and damages alike.

Severability

A provision treating each insured separately, so one person’s misconduct or misstatement does not automatically void coverage for innocent insureds — important in multi-owner firms.

Subrogation (and waivers)

The carrier’s right to recover a paid claim from the party responsible. Contracts often require you to waive subrogation in favor of clients — done by endorsement, and your carrier needs to agree.

Sublimit

A smaller limit inside the policy for specific costs — regulatory defense, disciplinary proceedings, social-engineering fraud. Sublimits are where coverage surprises live; read them before you need them.

Surplus lines

Insurance placed with non-admitted carriers for risks the standard market declines — common for unusual professions, new ventures, and claim-scarred accounts. Flexible, legitimate, and outside the state guaranty fund.

Tail coverage

See extended reporting period — the coverage that keeps past work protected after a claims-made policy ends.

Third-party coverage

Insurance for claims others bring against you — the liability side of any policy, as opposed to first-party coverage for your own losses.

Umbrella / excess liability

Additional limits sitting above underlying policies (GL, auto, employers liability). Note that standard umbrellas usually do not extend professional liability — higher E&O limits require excess E&O.

Underwriting

The carrier’s evaluation of your risk — services, revenue, claims history, controls — that determines eligibility, terms, and price. Applications are underwriting documents; treat them with contract-level care.

Vicarious liability

Legal responsibility for another’s acts — the principle that puts a firm on the hook for its people and its subcontractors, and a reason certificates from subs matter.

Waiver of subrogation

An endorsement in which your carrier gives up recovery rights against a named party (usually your client) — a standard contract requirement in commercial work.

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