Combined single limit (CSL)

A combined single limit (CSL) insurance policy gives one total dollar amount to cover all bodily injury and property damage claims arising from one incident. Instead of dividing your coverage into separate sub-limits like split-limit policies do, a CSL combines everything into one pool of liability coverage.

While split-limit policies have separate caps for each category of loss, CSLs will cover any combination of injury and property damage losses from an accident.

CSLs are commonly found in commercial auto insurance policies, but also appear in other liability policies.

A $500,000 combined single limit means your insurer will pay up to $500,000 for all covered liability damages arising from a single incident, whether those damages involve bodily injury, property damage, or both.

Here’s an example of how different claims would affect a $500,000 CSL:

With a $500,000 CSL policy, the insurer would pay the entire covered loss because the total claim remains below the policy limit.

A $300,000 CSL provides a single $300,000 policy limit to cover all damages and injuries stemming from one covered incident.

Here’s an example of claims on a $300,000 CSL policy:

Single limit simply refers to having one coverage amount for all liability damages from a single occurrence, rather than multiple separate limits each capping a different type of loss. In terms of CSL, it’s what gives the policy its flexibility.

While combined single limits pool all bodily injury and property damage losses into one coverage limit per incident, a split limit policy divides your liability coverage into three separate maximum caps.

For example, a common split limit policy is written as 100/300/50, meaning $100,000 bodily injury coverage per person, $300,000 bodily injury coverage per accident, and $50,000 property damage coverage per accident. If funds go unused in one bucket, you can’t use it to cover a liability claim from another bucket.

On the other hand, CSLs offer flexibility since funds can’t get trapped in unused coverage categories. This helps with large property damage claims or severe injury claims, making it easier for businesses to track their total coverage, because there’s only one number to track.

Here’s how these two types of liability coverage compare:

No, a combined single limit and an aggregate limit are two different things. While CSLs apply to each occurrence or accident, general aggregate limits are the maximum amount your insurance company will pay during an entire policy period (usually one year).

In short, a CSL applies to one incident, while the aggregate applies to the policy as a whole.

Small business owners may encounter combined single limits or CSL-style liability structures across several types of coverage, including:

As the most common example of CSL, commercial auto insurance protects against bodily injury and property damage caused by company-owned vehicles. Typically, these policies are written with CSL amounts of $300,000, $500,000, or $1 million.

Businesses that tend to carry this coverage regularly drive for work, such as:

• Contractors, including plumbers, handymen, and electricians
• Delivery services, like Grubhub drivers and Instacart shoppers
• Landscapers, lawn care services, and gardeners
• Consultants, including software developers and marketing consultants
• Service providers, such as public speakers and recruiters

If you or your employees use personal, leased, or rented vehicles for business purposes, you need hired and non-owned auto insurance (HNOA). Contract requirements may specify CSL amounts for this type of coverage, and HNOA can be paired with commercial auto coverage.

General liability policies are typically written with a per-occurrence limit and an aggregate limit rather than being offered as CSL. However, the underlying coverage is similar: a single limit is available for covered claims arising from one incident, whether those claims involve a bodily injury, property damage, or both.

When comparing policies, you should understand how limits will apply across many types of claims, so you have a clear idea of how much protection you’ll have if an accident or lawsuit happens.

Commercial umbrella insurance extends liability protection above the limits of your underlying insurance policies, including commercial general liability, commercial auto, and employer’s liability insurance.

Client contracts that require higher combined single limits, such as $2 million or more, may be hard to meet through a primary insurance policy. Adding umbrella coverage can help satisfy those requirements while also protecting against catastrophic claims that might otherwise exceed your base coverage.

Professional liability insurance, also known as errors and omissions (E&O) insurance, generally uses per-claim and aggregate limits rather than CSL terminology. This structure is more common for coverage that addresses financial harm caused by professional mistakes versus bodily injury or property damage losses that CSL is designed to cover.

Understanding how liability limits work is important when evaluating your overall risk management strategy. Knowing whether your policies use CSL, split limits, or per-claim structures can help you identify coverage gaps before a claim occurs.

Many contracts, commercial leases, and vendor agreements have specific liability limits businesses must carry, including combined single limit amounts. Common threshold amounts include:

• $500,000 CSL
• $1 million CSL
• $2 million CSL

It’s important to review contractual insurance requirements before purchasing your coverage. For instance, if a client requires a $1 million CSL policy, a split-limit insurance policy may not satisfy the contract. Failure to meet contract requirements can delay projects, bids, permits, or vendor approvals.

Keeping your certificate of insurance (COI) handy can speed up the process—these documents provide policy limits, coverage details, and proof of coverage.

Industries that must often meet CSL requirements include construction companies, trucking businesses, property managers, and government contractors.

Yes, a combined single limit policy is generally more expensive than split-limit coverage, due to the flexibility it provides. Since the insurance company can allocate the full limit to any combination of covered damages, CSL policies typically result in larger claim payouts.

However, pricing varies by factors like:

• Coverage limit
• Industry
• Vehicle type
• Driving records
• Claims history
• Business location

However, cost should always be weighed against protection. For example, a split limit policy may be cheaper, but it's more likely to leave you unprotected after a claim, making it more expensive in the long run. Comparing quotes and speaking to a licensed insurance agent can help you determine which type of coverage meets your business's unique needs.

Insureon’s licensed insurance agents can help you secure affordable insurance coverage for all of your small business needs. With just one easy online application, you can compare quotes for general liability, workers’ compensation, and more from our top-rated insurance partners.

Once you find the right policies, you can typically begin coverage and get a certificate of insurance (COI) for your small business in less than 24 hours.