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What is the difference between Claims-made and Occurrence insurance for your business?
KEY FINDINGS
- Claims-made insurance covers claims reported during an active policy period.
- Occurrence insurance is used towards incidents that happen while the policy is in force.
- Occurrence policies continue protecting past incidents after the policy expires, whereas claims-made coverage can end if the policy lapses without purchased tail coverage.
- Claims-made policies typically start with lower premiums, but costs can rise over time and may include an additional tail coverage expense.
- Losing a retroactive date, missing a renewal, or failing to purchase tail coverage can create significant insurance gaps under a claims-made policy.
An Occurrence policy is triggered when an incident happens. A Claims-made policy is triggered when you report a claim. The type of commercial liability policy you hold, rather than the coverage amount, can determine whether your insurer covers your claim.
How much does a Claims-made or Occurrence policy cost in Canada?
Your industry, business size, and claims history typically determine the cost of business insurance. But the two structures have different cost patterns:
- Claims-made starts cheaper: Premiums rise each year as your window of past work grows, levelling off around year seven. Factor in tail coverage costs when you eventually cancel. More details below.
- Occurrence costs more upfront but doesn’t increase year-over-year: There's no exit cost when the policy expires.
Why is the difference important?
Imagine you're a management consultant in Toronto. A client claims your advice in 2022 leads to a $400,000 lawsuit filed in 2025.
- Occurrence policy active in 2022: that old policy responds, even if it expired.
- Claims-made policy active in 2025: your current policy responds as long as 2022 falls after your retroactive date.
- Claims-made policy that lapsed in 2024 with no tail coverage: no coverage available for work you were insured for at the time.
| Claims-made policy | Occurrence policy | |
|---|---|---|
| What triggers coverage | When claim is reported to your insurer | When incident happened |
| Does the policy need to be active when you claim? | Yes. If your policy has lapsed, you're not covered | No. Even an expired policy responds if incident happened when it was active |
| Retroactive date | Yes. Incidents before this date aren't covered | Not applicable |
| Tail coverage needed? | Yes. Required if you cancel or don't renew your policy | No, past incidents stay covered automatically |
| Which limits apply | Your current policy limits, across all past work | Limits from the year incident occurred |
| Typical starting cost | Lower premiums in early years | Higher at start, stable over time |
| Long-term cost | Premiums rise over ~7 years; tail coverage adds an exit cost when you cancel | Consistent year-over-year, no exit cost |
Source: Dolden Wallace Folick LLP, Healthcare Insurance Reciprocal of Canada, Canadian Lawyers insurance association (CLIA)
“Occurrence based is typically standard for all Commercial General liability policies. As long as the policy was in force at the time of the claim, your current insurance company would respond to it,” says Gordon Allen, licensed commercial insurance broker and Rates.ca expert.
Or, if you have no current insurance, the insurance company you had at that time of the incident would respond, he says.
Read more: 4 types of insurance you need as a general contractor
How does a Claims-made policy work?
Three conditions must all be true for a claim to be covered:
- The incident occurred on or after your retroactive date
- The claim is made against you during the active policy period (or within a purchased extension)
- You report the claim to your insurer within the required timeframe, typically within the same policy period
If a Claims-made policy ever lapses, and “a claim is made for something, for instance, the year before the current policy began, the policy won't respond to the claim,” warns Allen.
Related: Professional vs. general liability insurance: What coverage does your business need?
What is a retroactive date?
A retroactive date is the earliest date in the past from when your policy will cover any claim. Incidents before a retroactive date aren't covered, even if you're actively insured today.
Each time you renew with the same insurer, that retroactive date stays fixed, so your protected window grows. If you switch insurers and the new policy doesn't carry your original date forward, you can lose years of coverage overnight. Always confirm the retroactive date in writing before cancelling.
Learn more: Do I need business insurance if I already have WSIB in Ontario?
How do aggregate limits work across past and current claims?
Under a Claims-made policy, all past acts compete for your current aggregate limit. Two claims in one year: one for work done in 2022, one for 2024, both draw from the same pool. Occurrence policies give each policy year its own separate aggregate amount.
“Personally, I deal with smaller businesses, so the maximum limit I ever see is $10,000,000. But you could get more depending on what you're doing. Some policies will have a $2 million Occurrence and a 5 million aggregate [amount],” says Allen. More simply, this means that each claim would have up to $2 million to claim, and $5 million for the total policy term.
What is tail coverage and how much does it cost in Canada?
Tail coverage (also called an Extended Reporting Period or ERP) is a one-time payment that keeps your past work protected after a Claims-made policy ends. It doesn't extend your policy or increase your limits. It only keeps the reporting window open for past incidents when the policy was in effect.
| Tail duration | Typical cost |
|---|---|
| 2–3 years | 100–200% of your final annual premium |
| 6 years / unlimited | 300%+ |
Source: SmartSMSSolutions Canada
Many Canadian insurers waive or reduce the tail for long-tenured policyholders who fully retire.
What is nose coverage?
Nose coverage (prior-acts coverage) is an alternative to buying ‘tail’ when you're switching insurers rather than retiring. Your new insurer covers your prior acts and spreads the cost into future premiums instead of a lump sum.
In which scenario would you use Claims vs. Occurrence policy coverage in Canada?
| Coverage type | Most appropriate coverage | Reason |
|---|---|---|
| Errors & omissions (E&O) / professional liability | Claims-made | Advice-related claims can surface years after work done |
| Medical and healthcare malpractice | Claims-made | Injuries or misdiagnoses may not be discovered for years |
| Lawyers' professional liability (LPLI) | Claims-made | Standard across virtually all Canadian law firms |
| Directors & officers (D&O) | Claims-made | Shareholder and regulatory claims are typically delayed |
| Employment practices liability (EPLI) | Claims-made | Harassment and discrimination allegations often surface long after the fact |
| Cyber liability | Claims-made | Data breaches are frequently discovered months after they occur |
| Commercial general liability (CGL) | Occurrence | Slip-and-falls and property damage are discovered quickly |
| Commercial auto insurance | Occurrence | Accidents and injuries are reported promptly |
| Commercial property insurance | Occurrence | Losses are immediate and visible |
| General contractor insurance | Occurrence | Physical damage on job sites surfaces close to incident (note: contractor E&O is claims-made) |
Sources: Sharp Insurance, HIROC, Insurance training center
Note: Canadian Lawyers insurance association’s (CLIA) mandatory $1M professional liability policy for lawyers is a hybrid. This means Claims-made for active members, but occurrence-like for those who retire, resign, or pass away.
Related: How to get insurance for your company vehicle?
What are situations that catch businesses off guard?
Claims-made policies have more moving parts than Occurrence policies, which means more ways coverage can quietly disappear. These are the most common pitfalls Canadian professionals run into, and how to avoid them.
| Situation | What happens | How to avoid it |
|---|---|---|
| Retroactive date reset | You switch insurers and lose years of coverage for past incident potential claims | Confirm new retroactive date in writing before cancelling |
| New employer policy | Your new employer's policy may not cover your past work | Before leaving, get written confirmation of who handles tail and whether your retroactive date carries forward |
| Policy lapses (without tail coverage) | A missed payment negates claims for past work | Buy tail before policy ends, not after |
| Tail window closes | Insurers typically give only 30–60 days after cancellation to buy tail coverage | Decide on tail before your policy ends |
| CGL is not the same as E&O | A CGL policy covers bodily injury and property damage, but not professional errors or bad advice | If your work involves advice or professional services, you need a separate E&O policy |
Source: CLIA, Smart SMS solutions
Which policy is better for you?
Commercial sales broker, Allen says "Occurrence, if it's available, is always the best option... If a contractor let his [Claims-made] policy lapse, he would have no coverage for a lawsuit. However, the insurance company would then get a lawsuit for not providing Occurrence-based coverage."
Occurrence is simpler: once the policy year ends, it's done. On the other hand, Claims-made takes more active management. If you're on a Claims-made policy, keep in mind:
- Your retroactive date: Whether moved at renewal
- Your exit plan: Tail or nose coverage whenever your situation changes
- Your aggregate limit: Past acts and current-year claims all share total coverage amount
A licensed commercial insurance broker familiar with Canadian regulations is the best person to review your specific situation.
Read next: Insuring your summer business, from food trucks to ice cream stands
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Arshi Hossain, Associate editor
Arshi Hossain is the associate editor at Rates.ca. She has 4+ years of experience in delivering strategy-backed digital content through various mediums. Her expertise lies in breaking down complex information, meeting people where they are, and in the moments that matter.
Prior to joining Rates.ca, she worked in the editorial and digital content space at Wealthsimple, supported digital strategies, and UX writing for payment products and solutions at Bank of Montreal. She has also worked with startups to support editorial, content writing, communications, copywriting, and marketing needs.
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