A combined single limit, usually shortened to CSL, is a car insurance liability limit that puts all of your coverage into one pool. Bodily injury and property damage both come out of that same pool. If you carry a $500,000 combined single limit and cause an accident, up to $500,000 is available to pay for everything you are responsible for, in any combination.
That is different from the way most policies are written. Most drivers have split limits, which divide the same coverage into three separate buckets that cannot borrow from each other.
What CSL stands for
CSL stands for combined single limit. You will also see it written as a single number on your declarations page, such as “CSL $500,000” or “500 CSL,” where split limits would show three numbers separated by slashes.
How split limits work
Colorado’s state minimum liability is written as split limits: $25,000 / $50,000 / $15,000.
Each number is a separate ceiling.
- The first number, $25,000, is the most the insurance company will pay to any one person you injure. That coverage could be used for the other party’s bodily injury, pain and suffering, and lost wages.
- The second number, $50,000, is the most the company will pay for the entire accident for injuries, no matter how many people are hurt.
- The third number, $15,000, is the most the company will pay for property damage. Most often that is the other person’s car, but it can also be a building, a road sign, a house, or anything else you damage.
The buckets do not share. If you injure one person badly and cause $2,000 in property damage, the unused property damage money does nothing for the injury claim.
Worth being clear about what that adds up to: the absolute most a 25/50/15 policy will ever pay in one accident is $65,000, which is the $50,000 injury ceiling plus the $15,000 property damage ceiling. The $25,000 is not additional money. It is a cap that lives inside the $50,000.
Nobody should carry state minimum limits. At Premier Mountain Insurance we rarely write them at all, and only when there is a specific and legitimate reason.
How a combined single limit works instead
With a combined single limit there is one number and no buckets.
Say you carry $100,000 CSL and cause an accident that injures three people and totals two cars. Every one of those injury claims and both vehicle claims draws from the same $100,000. Nothing is stranded in a bucket that does not apply.
Compare that to state minimum coverage in the same accident, where you would be capped at $50,000 for all three injuries combined and $15,000 for both cars, and you can see why the structure matters as much as the number.
CSL versus split limits: a direct comparison
Take a $250,000 / $500,000 / $100,000 split limit policy against a $500,000 combined single limit.
On paper the split limit policy looks larger, because $500,000 of injury coverage plus $100,000 of property damage means up to $600,000 could come out in a single catastrophic accident, against $500,000 for the CSL.
In practice the CSL usually protects you better, for one reason: most vehicles on the road have one person in them.
| Scenario | 250/500/100 split limits | $500,000 CSL |
|---|---|---|
| You seriously injure one person | $250,000 maximum | $500,000 available |
| You injure three people | $500,000 maximum for all three | $500,000 shared across all claims |
| You hit a pedestrian | $250,000 maximum | $500,000 available |
| Property damage | $100,000, separate bucket | Comes out of the same $500,000 |
| Largest possible single accident payout | $600,000 | $500,000 |
If you hit a car with one occupant, that $250,000 per person cap is the only number that matters. The $500,000 second number never comes into play, because it only applies when more than one person is injured. Hit a pedestrian and it is the same story.
A serious injury claim can pass $250,000 without much difficulty once you add surgery, rehabilitation, lost income, and pain and suffering. The combined single limit gives you twice as much room in exactly the situation you are most likely to face.
When split limits are the better choice
Many of our clients carry $500,000 / $500,000 / $500,000. That is better than or equal to a $500,000 CSL in every scenario, because the full $500,000 stays available for bodily injury even when only one person is hurt, and property damage draws on its own separate $500,000 rather than eating into the same pool.
The trade off is what it costs to get there. A $500,000 CSL is often priced attractively enough that it is worth weighing.
It also helps to know that property damage claims are rarely the problem. Most property damage losses come in under $50,000 and almost never approach $500,000. The exposure that actually threatens your savings and your future income is a serious injury claim, which is precisely where the combined single limit has the advantage.
Why Colorado’s minimums leave you exposed
Whichever structure you choose, the state minimum is the wrong starting point, and the property damage number shows why most clearly.
Colorado requires $15,000 of property damage coverage. The average new vehicle sold in June 2026 went for $49,758, according to Kelley Blue Book. Total a newer car and your $15,000 does not cover a third of it. The rest comes from you.
Bodily injury works the same way. Cause an accident that runs $100,000 in medical bills for the other driver and a 25/50/15 policy leaves you personally responsible for the shortfall, which is the kind of debt that follows someone for years. A plaintiff’s attorney will look past the policy limit and at your income and your assets.
Where umbrella policies fit
Once your auto liability is at a sensible level, a personal umbrella policy is the cheapest way to add a large amount of additional coverage on top of it. Umbrellas sit above your auto and home liability and are built for the catastrophic case, which is why they cost comparatively little for the protection they provide.
They matter most for people with above average assets or income, because those are the people worth suing beyond a policy limit. Most carriers require you to carry specific underlying auto and home limits before they will write one, so the umbrella conversation and the liability limit conversation belong together.
What limits we recommend in Colorado
There is no single right answer, and it genuinely depends on the limits you are comparing. What we would say is this:
State minimum coverage is not a serious option for anyone with assets or income to protect. Above that, the question is not only how big the number is but how the number is structured, and a combined single limit will often do more for you than a split limit that looks bigger.
Three things drive where you should land:
- What you have to lose. The more assets and future income you have, the higher your limits should be. You are not only covering the immediate bill, you are protecting what you have already built.
- Your exposure. How much you drive, what you drive, and who else drives your car all move the number. A household with a teenage driver carries different risk than one without.
- What the increase actually costs. Moving from low limits to strong ones is usually a smaller premium difference than people expect, because the catastrophic claims that drive the extra coverage are rare. It is worth seeing the two numbers side by side before assuming you cannot afford it.
If you are not sure what you currently carry, pull out your declarations page and look for either three numbers separated by slashes or one number labeled CSL. If you would rather have someone read it for you, that is a two minute phone call.
Common questions
Is CSL better than split limits?
Usually, when compared to a split limit policy with the same headline number, because the per person cap on split limits is the one most likely to be hit. Compared to a policy where all three split limits equal the CSL, such as 500/500/500 against $500,000 CSL, the split limit policy is better or equal in every scenario.
What does 500 CSL mean?
It means $500,000 of liability coverage available for any combination of bodily injury and property damage in a single accident.
What does 500/500 mean?
It is shorthand for $500,000 per person and $500,000 per accident in bodily injury coverage. Property damage is usually stated as a third number.
Does a combined single limit cover my own car?
No. Liability limits pay for damage and injuries you cause to other people. Damage to your own vehicle comes from the collision and comprehensive coverage on your car insurance policy.
Not sure which structure you have, or whether your automobile insurance limits are anywhere near where they should be? Call Premier Mountain Insurance at 303-922-1002 and we will read your declarations page with you.
