Liability limits are one of the most important numbers on an auto policy, yet the notation can be easy to misread. A declaration such as 100/300/100 and a $300,000 combined single limit do not allocate money in the same way, even though both contain a $300,000 number.
The distinction matters most when one accident produces uneven losses—for example, one severely injured person plus major damage to another vehicle. Understanding the limit structure helps you see where the policy can run out.
What split limits mean
Split limits typically divide liability protection into three buckets: bodily injury per person, bodily injury per accident and property damage per accident. The exact legal minimums differ by state, and this article uses round numbers only as illustrations.
Suppose a policy shows 100/300/100. In a simplified example, that can mean up to $100,000 of covered bodily injury liability for one injured person, up to $300,000 for bodily injury to all people in one accident, and up to $100,000 for covered property damage in that accident.
The per-person bodily injury cap still matters even when the total bodily injury loss is below the per-accident maximum. One injured claimant with $180,000 of covered damages would not turn the $300,000 accident bucket into a $180,000 per-person limit.
What a combined single limit means
New York’s Department of Financial Services explains that some insurers offer a combined single overall limit for bodily injury and property damage instead of separate limits. With a CSL, one maximum amount applies to covered liability damages from the accident, subject to policy terms.
A $300,000 CSL can therefore be more flexible in a loss where bodily injury is modest but property damage is unusually high, or vice versa, because the policy does not have the same separate property-damage bucket. That does not make a CSL unlimited; once the combined maximum is exhausted, the policy has reached its liability limit for that covered accident.
| Feature | Split limits | Combined single limit |
|---|---|---|
| Structure | Separate bodily-injury and property-damage caps | One overall liability maximum |
| Per-person bodily injury cap | Usually explicit | No separate split bucket in the same format; policy wording controls |
| Property damage bucket | Separate maximum | Shares the overall limit |
| Flexibility across injury/property losses | Constrained by each bucket | More flexible allocation within the overall maximum |
Example 1: one serious injury
Assume a covered accident creates $175,000 of bodily injury damages to one person and $25,000 of property damage. With a 100/300/100 split-limit policy, the bodily injury payment to that person can be constrained by the $100,000 per-person limit even though the accident-wide bodily injury limit is higher. A $300,000 CSL, subject to all policy terms, has one overall limit rather than that split per-person bucket.
Example 2: expensive property damage
Assume covered bodily injury is $40,000 but property damage is $160,000. A split policy with a $100,000 property-damage limit can reach that bucket even though the bodily injury limits have plenty of unused capacity. A $300,000 CSL may have more room to respond because both covered categories draw from one overall maximum.
These examples are intentionally simplified. Real claims involve fault, damages, multiple claimants, defense provisions, exclusions and state law.
Minimum limits are not a personal recommendation
Every state has its own financial-responsibility and insurance requirements. A statutory minimum tells you the legal floor where applicable; it does not tell you how much liability risk your household can comfortably retain.
New York DFS, for example, encourages consumers with assets to consider increased bodily injury limits and notes that repair costs and medical expenses can be substantial. The relevant minimums and available forms in your state may differ.
How umbrella insurance fits
Households seeking higher liability protection sometimes pair an auto policy with a personal umbrella. Umbrella policies normally require specified underlying auto liability limits and have their own eligibility and coverage terms. Our umbrella insurance guide explains how excess liability works.
Do not assume an umbrella fixes every low underlying limit. If the underlying policy does not meet required limits, the insured can face a gap or retained amount depending on the umbrella wording.
Questions to ask when comparing quotes
- Are the liability limits split or combined?
- If split, what are the per-person, per-accident and property-damage limits?
- What state minimum applies, and how much higher protection is available?
- Does the quote include uninsured/underinsured motorist coverage, and how is that limit structured?
- If you have an umbrella, do the auto limits satisfy its underlying requirements?
- Are defense costs inside or outside the stated liability limit under the policy wording?
For another liability layer that is often misunderstood, see our guide to uninsured and underinsured motorist coverage. If cost is the issue driving a limit decision, why car insurance is expensive explains common rating pressures without suggesting that coverage should simply be cut.
Frequently asked questions
Is a combined single limit always better?
It offers more flexibility across covered bodily injury and property damage, but price, availability, total limit and policy terms still matter. Compare the whole contract.
Does 100/300/100 mean I have $500,000 of coverage?
No. The numbers are separate caps for different categories; they should not simply be added together as one usable pool.
Can I choose CSL in every state?
No. Availability depends on the insurer, policy form and jurisdiction.
Does liability coverage pay for damage to my own car?
Not generally. Liability coverage addresses covered liability to others. Damage to your own vehicle is typically handled, when applicable, through collision, comprehensive or another relevant coverage.
Sources & further reading
Reviewed October 6, 2026. Auto insurance requirements and policy forms vary by state and insurer. Examples are educational and do not replace the actual declarations or policy contract.
