Two liability policies can have the same limits and the same price and still protect you very differently — because of one word on the declarations page: occurrence or claims-made. The difference is about *which claims trigger coverage*, and it's one of the most consequential distinctions in insurance that business owners never get explained. Here it is.
What's the difference between occurrence and claims-made?
It comes down to when the event happened vs. when the claim is filed:
- Occurrence policies cover claims arising from an incident that happened during the policy period — regardless of when the claim is actually made. If something goes wrong this year, this year's policy covers it even if the lawsuit shows up five years from now, long after the policy expired.
- Claims-made policies cover claims that are first made during the policy period — and only for incidents that happened after a set retroactive date. What matters is when the claim is *reported*, not just when the event occurred.
A quick example: a mistake happens in 2026 but the lawsuit isn't filed until 2029. An occurrence policy from 2026 responds (the incident was in its period). A claims-made policy responds only if a claims-made policy is still in force in 2029 *and* its retroactive date reaches back to 2026.
Why does this distinction matter?
Because it decides whether you're covered for the long tail between when something goes wrong and when someone sues over it — and in many fields that gap is years. It also changes what happens when you switch carriers, cancel, retire, or sell: an occurrence policy's past years stay covered forever, while a claims-made policy can leave a gap unless you manage it carefully.
Which lines use which?
- Occurrence is typical for general liability, most property, and commercial auto. If your GL is occurrence-based, each year you carry it is locked in once it expires.
- Claims-made is common — and sometimes the only option — for professional liability / E&O, directors & officers, employment practices, cyber, and medical malpractice. These lines deal with claims that can surface long after the work was done, so carriers write them claims-made and manage the exposure with retroactive dates. (For how E&O and GL differ in what they cover, see professional liability vs. general liability.)
Retroactive date and tail coverage: the claims-made fine print
If you carry a claims-made policy, two features control whether it actually protects you:
- The retroactive date is the earliest incident date the policy will cover. Anything before it is excluded. Protecting this date as you renew or switch carriers is essential — if it resets to today, you lose coverage for everything that happened in prior years, even though you were insured the whole time.
- Tail coverage (an extended reporting period, or ERP) lets you report claims *after* the policy ends, for incidents that happened while it was in force. You need it when you cancel, change carriers, retire, or sell the business — otherwise there's a window where an old incident can surface with no policy to report it to. The reverse, "nose" coverage, is when a new carrier agrees to pick up your prior retroactive date instead.
Mismanaging either one is how a business that was "always insured" ends up with an uncovered claim.
How do I know which I have — and which I want?
Check your declarations page; it states whether each policy is occurrence or claims-made. As a rule of thumb:
- For GL and property, you'll usually have (and want) occurrence — it's cleaner and locks in each year.
- For E&O, D&O, cyber, and similar, claims-made is normal and often unavoidable — the key is continuity: keep the coverage in force, protect the retroactive date, and plan for tail coverage before you ever cancel or switch.
Our approach
At Cory Washington & Co., we make sure you know which basis each of your policies is written on and what that means for you — especially on claims-made lines, where we protect your retroactive date through renewals and carrier changes and plan tail coverage *before* you cancel, retire, or sell, not after a claim exposes the gap. The goal is simple: no claim falls into the space between "when it happened" and "when it was reported."
Not sure whether your policies are occurrence or claims-made? Request a quote or a policy review and we'll check the basis and the dates with you.
Frequently Asked
What is the difference between occurrence and claims-made insurance?
An occurrence policy covers claims arising from incidents that happened during the policy period — no matter when the claim is actually filed, even years after the policy ends. A claims-made policy covers claims that are first made during the policy period, and only for incidents after a set retroactive date. In short: occurrence locks in coverage based on when the event happened; claims-made is based on when the claim is reported.
Which is better, occurrence or claims-made?
Occurrence is generally simpler and safer for the policyholder because coverage for that year is locked in permanently once the policy expires. Claims-made is common (and sometimes the only option) for professional liability, D&O, and some other lines, and can cost less up front — but it requires you to maintain continuous coverage, protect your retroactive date, and buy a tail if you cancel or switch. Neither is universally better; it depends on the line of coverage and how you manage it.
What is a retroactive date and tail coverage?
On a claims-made policy, the retroactive date is the earliest incident date the policy will cover — anything before it is excluded. Keeping that date intact as you renew is critical; if it resets, you lose coverage for prior years. Tail coverage (an extended reporting period) lets you report claims after the policy ends for incidents that happened while it was in force — essential when you cancel, switch carriers, retire, or sell the business.
This article is general information for business owners, not insurance or legal advice, and does not bind or alter coverage. Policy terms, eligibility, and pricing vary by carrier and state — confirm specifics with our licensed team before making decisions.