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What Are Per Occurrence and Aggregate Limits?
When you purchase car insurance, your policy assigns dollar limits to how much your insurer will pay when a covered claim occurs. Two of the most important — and most misunderstood — terms you'll encounter are per occurrence limit and aggregate limit. Knowing the difference between the two can be the deciding factor in whether you're fully protected after a serious accident or left paying out of pocket.
A per occurrence limit (sometimes called a per accident limit) is the maximum amount your insurance company will pay for all damages and injuries stemming from a single incident. Whether one person or five people are injured in that accident, the per occurrence limit is the total ceiling your insurer will cover for that one event.
An aggregate limit, on the other hand, is the maximum total amount your insurer will pay across all claims filed within your policy period — typically one year. Think of it as a shared pool of money that gets drawn down each time a claim is paid out. Once that pool is empty, no further claims are covered until the policy resets.
| Term | Definition | Applies To |
|---|---|---|
| Per Occurrence Limit | Max payout per single accident/event | Each individual incident |
| Aggregate Limit | Max total payout for all claims in a policy period | All incidents combined within the policy year |
| Policy Period | The time frame your coverage is active (typically 6 or 12 months) | Resets at renewal |
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How These Limits Apply to Liability Coverage
Liability coverage is where per occurrence and aggregate limits are most relevant in an auto insurance policy. Your liability coverage is split into two components:
- Bodily Injury Liability (BI): Covers injuries to other people when you're at fault
- Property Damage Liability (PD): Covers damage to other people's vehicles or property
Most personal auto policies express bodily injury liability limits using a split limit format — for example, 100/300/100. Here's what that means:
- $100,000 – Maximum paid per injured person in a single accident
- $300,000 – Maximum paid for all bodily injuries in a single accident (this is your per occurrence BI limit)
- $100,000 – Maximum paid for property damage per accident
In this structure, the middle number is your per occurrence limit for bodily injury. If three people are injured and each has $150,000 in medical bills, your insurer won't pay $450,000 — they'll pay a maximum of $300,000 total for that one accident, divided among the injured parties.
Real-World Example: Multiple Accidents in One Policy Year
Let's say your policy has a $300,000 per occurrence / $600,000 aggregate liability limit:
- Accident #1 (March): You rear-end two vehicles; total damages and injuries = $280,000. Your insurer pays $280,000. Remaining aggregate: $320,000.
- Accident #2 (August): You run a red light; total damages = $350,000. Your insurer can only pay $320,000 (the remaining aggregate). You are personally responsible for the remaining $30,000.
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Per Occurrence vs. Aggregate: Personal Auto vs. Commercial Policies
This is where things get critically different depending on your policy type.
Personal Auto Insurance
In standard personal auto policies, aggregate limits are rarely used. Your liability protection typically resets with each accident — there's no running total that depletes across multiple incidents within the year. Each accident is evaluated against your per occurrence (per accident) limits independently. This makes personal auto insurance simpler and more forgiving for everyday drivers.
Commercial Auto Insurance
Commercial auto policies — used for business vehicles, delivery fleets, rideshare operations, and company cars — commonly include both per occurrence AND aggregate limits. This is because commercial vehicles face much higher claim frequency and severity.
Typical commercial auto limits are $1,000,000 per occurrence / $2,000,000 aggregate for many businesses, with higher requirements for vehicles transporting passengers or hazardous materials. High-risk drivers — such as those with multiple at-fault accidents or DUI history — may also find that non-standard insurers apply tighter aggregate structures to manage their exposure.
How Limits Reset and How to Choose the Right Amounts
How Policy Limits Reset
For personal auto insurance, your limits refresh automatically at the start of each new policy period — typically every 6 or 12 months upon renewal. There is no rollover of unused coverage; each policy period stands alone. If you file a $50,000 claim in one period and had $300,000 in coverage, you don't "lose" $250,000 — your full limits are restored at renewal.
For commercial policies with aggregate limits, the same renewal reset applies. Once a policy period ends, the aggregate resets to its full amount for the next term. This is why timing matters: if you're approaching the end of a policy year and your aggregate is nearly exhausted, you're in a vulnerable position.
How to Determine Adequate Coverage Amounts
Experts consistently recommend choosing bodily injury liability limits that exceed your state's minimum requirements. Here's a practical framework:
| Your Situation | Recommended Minimum Limits |
|---|---|
| Young driver, minimal assets | 50/100/50 |
| Homeowner or moderate assets | 100/300/100 |
| High net worth / multiple assets | 250/500/100 or higher |
| Commercial / business vehicle use | $1M CSL minimum |
| High-risk driver (DUI, multiple accidents) | Consult insurer for custom structure |
Key factors to consider when setting your limits:
- Your net worth – Liability claims can target your savings, home equity, and future wages. Your limits should be high enough to protect what you own.
- Your driving environment – Urban drivers face more claim frequency; rural drivers may face higher severity due to higher speeds.
- Vehicle type – Large trucks, SUVs, and commercial vehicles cause more damage in accidents, increasing your exposure.
- Frequency of driving – The more miles you put on, the greater your odds of being involved in an at-fault accident.
Frequently Asked Questions
What is a per occurrence limit in car insurance?
A per occurrence limit is the maximum dollar amount your insurance company will pay for all damages — including bodily injuries and property damage — resulting from a single accident. It doesn't matter how many people are involved; the per occurrence limit is the total ceiling for that one event. For example, with a $300,000 per occurrence limit, your insurer won't pay more than $300,000 for any single accident regardless of total damages claimed.
Do personal auto insurance policies have aggregate limits?
In most cases, no. Standard personal auto insurance policies do not use aggregate limits. Your liability limits simply apply to each accident independently, meaning multiple accidents in the same policy year each receive their own full coverage up to your per occurrence limit. Aggregate limits are far more common in commercial auto policies, where claim frequency is higher and insurers need to cap total annual exposure.
When does an aggregate limit reset?
Your aggregate limit resets at the beginning of each new policy period, which is typically every 6 or 12 months when your policy renews. Unused coverage does not roll over, and any claims paid out during the policy period do not carry forward. Once a new period begins, your full aggregate limit is restored and available for new claims.
Why do aggregate limits matter for high-risk drivers or commercial vehicles?
High-risk drivers and commercial operators are more likely to be involved in multiple incidents during a single policy year, which means there's a real chance of exhausting an aggregate limit. For a commercial fleet, one bad month with multiple accidents could burn through an aggregate limit quickly, leaving vehicles and drivers unprotected for the remainder of the year. This is why commercial policies often pair aggregate limits with umbrella or excess liability coverage for added protection.
How do I know if my car insurance limits are high enough?
A good rule of thumb is to carry liability limits at least equal to your total net worth — including savings, home equity, and other assets. Most financial experts recommend a minimum of 100/300/100 for drivers with any significant assets, and 250/500/100 for those with higher net worth. If you're unsure, speaking with an independent insurance agent can help you evaluate your exposure and find the right balance between adequate coverage and affordable premiums.