Occurrence vs. Claims-Made Insurance: What's the Difference?

The policy trigger is one of the most misunderstood concepts in business insurance. Get it wrong and you could have zero coverage for a claim from a project you completed years ago. Updated October 2026.

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At a Glance: Occurrence vs. Claims-Made

FactorOccurrence PolicyClaims-Made Policy
Coverage triggerIncident happens during policy periodClaim filed during active policy period
Coverage after policy ends✅ Yes — for incidents during policy period❌ No — claim must be filed while active
Tail coverage needed?❌ Not required✅ Essential when changing carriers or retiring
Retroactive date?❌ N/A✅ Yes — limits prior acts coverage
Typical cost10–30% more expensiveLower initial premium
Common for GL?✅ Yes — standard⚠️ Less common for GL
Common for E&O / D&O?❌ Rarely available✅ Standard for professional liability
Best forContractors, trades, most small businessesProfessionals, consultants, tech firms

How Occurrence Policies Work

An occurrence policy responds based on when the incident happened — not when the claim is filed. This is the simpler and more protective form of coverage for most businesses.

EXAMPLE — Occurrence GL for a Contractor

A general contractor installs a deck in June 2023 during an active occurrence GL policy year. In August 2026, the homeowner files a lawsuit claiming the deck was improperly built and collapsed. The 2023 occurrence policy responds — even though that policy year ended years ago — because the incident (the construction) occurred during that policy period.

  • ✅No tail coverage needed when you retire, switch carriers, or let the policy lapse
  • ✅Simpler to manage — prior years' policies provide ongoing protection automatically
  • →Typically costs 10–30% more than equivalent claims-made coverage

How Claims-Made Policies Work

A claims-made policy requires both the incident AND the claim to fall within the coverage window. This requires active management — especially when switching carriers or ending a business.

EXAMPLE — Claims-Made E&O for a Consultant

A management consultant provides advice on a project in 2023 under a claims-made E&O policy. She lets the policy lapse in 2024. In 2026, the client files a lawsuit over the 2023 advice. She has zero E&O coverage — the policy that was active during the incident (2023) has lapsed, and the claim is filed after the policy ended without tail coverage purchased.

Critical: Three key dates on every claims-made policy:

  • 1.Retroactive date: Earliest date of covered incidents. Prior acts are excluded.
  • 2.Policy period: The window when claims must be reported to trigger coverage.
  • 3.Extended reporting period (tail): Optional extension to report after the policy ends.

What is Tail Coverage and When Do You Need It?

Tail coverage (Extended Reporting Period / ERP) extends the reporting window after a claims-made policy ends. Without it, any claim filed after the policy ends — even for an incident during the active period — receives zero coverage.

You need tail coverage when:

  • ⚠️You are retiring or closing your business (claims can arrive years after operations end)
  • ⚠️You are switching carriers and the new carrier will not honor your original retroactive date
  • ⚠️You are cancelling your policy mid-year for any reason
  • ⚠️Your policy is being non-renewed by the carrier

Tail Coverage Cost:

Typically 100–300% of the final annual premium for a 1–5 year extension. A $2,000/year E&O policy might cost $2,000–$6,000 for a 3-year tail. This is a one-time purchase, not an ongoing premium.

Which Policies Use Which Form?

Coverage TypeOccurrence or Claims-Made?Notes
General Liability (GL)Occurrence (standard)Occurrence GL is the norm for contractors and most businesses
Professional Liability (E&O)Claims-Made (standard)Occurrence E&O is rare — tail coverage is essential
Directors & Officers (D&O)Claims-Made (standard)Retroactive date management is critical for D&O
Employment Practices (EPLI)Claims-Made (standard)Tail coverage important if HR exposure continues post-cancellation
Cyber LiabilityUsually Claims-MadeSome occurrence-equivalent products emerging but rare
Product LiabilityOccurrence (standard)Claims can arrive years after product sale — occurrence form preferred
Workers CompensationOccurrencePolicy in force when injury occurs governs — occurrence always
Commercial PropertyOccurrenceClaim filed when the loss occurs

Bottom Line: Know Your Policy Form Before You Buy

Occurrence is simpler and provides longer-term protection for contractors and businesses with long-tail liability exposure. Claims-made is standard for professional liability and requires active management of retroactive dates and tail coverage. When comparing quotes, always confirm the policy form — a cheaper claims-made quote without tail coverage can cost far more in an uncovered claim than the premium savings.

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Frequently Asked Questions

What is the difference between occurrence and claims-made insurance?+
An occurrence policy covers incidents that happen during the policy period, regardless of when the claim is filed. A claims-made policy only covers claims filed during the active policy period — both the incident AND the claim must fall within specified dates. This distinction matters most when a business switches carriers, lets a policy lapse, or retires. With claims-made, you can face a lawsuit five years after a project is complete and have no coverage if the policy has lapsed — with occurrence, you are covered as long as the incident happened during an active policy year.
What is tail coverage (extended reporting period)?+
Tail coverage (formally called an Extended Reporting Period, or ERP) is an add-on to a claims-made policy that extends the window in which claims can be reported after the policy ends or is cancelled. Without tail coverage, a claims-made policyholder who retires, switches carriers, or lets a policy lapse has zero coverage for incidents that occurred during the active policy period but were claimed afterward. Tail coverage costs typically run 1–3x the final annual premium and is often purchased for 1, 3, or 5 years of extended reporting.
Which is better: occurrence or claims-made?+
Occurrence is generally simpler and more protective for most businesses — you don't have to worry about tail coverage, policy continuity, or retroactive dates. However, occurrence policies can cost 10–30% more than equivalent claims-made coverage, and some professional liability coverages (E&O, D&O, EPLI) are almost exclusively available as claims-made. For general liability, occurrence is usually preferred. For professional liability, claims-made is often your only option — understanding tail coverage becomes essential.
What is a retroactive date on a claims-made policy?+
A retroactive date is the earliest date from which your claims-made policy will cover incidents. If your retroactive date is January 1, 2023, the policy will not cover claims for incidents that occurred before that date — even if they are first reported during the active policy period. When you renew a claims-made policy with the same carrier, they typically maintain your original retroactive date, providing continuous prior acts coverage. When you switch carriers, the new policy's retroactive date may be set at the switch date, creating a gap for prior acts unless the new carrier agrees to honor your original retroactive date.
Do contractors need occurrence or claims-made policies?+
General contractors and trade contractors almost always purchase occurrence-form general liability policies. Occurrence GL is standard in construction because the actual incident (the work performed) may result in claims years or decades later — a roof installed in 2023 that leaks in 2027. With an occurrence GL, the 2023 policy responds to that 2027 claim. A claims-made GL would require an active policy or tail coverage in 2027 to respond — creating ongoing premium obligations long after the project is complete.