Key Takeaways
- Defense costs can be paid either inside or outside your policy limits — the difference significantly affects how much coverage remains if a claim goes to trial.
- Under a standard ISO CGL policy, defense costs are typically paid outside the liability limits, preserving the full limit for judgments and settlements.
- Some policies — especially claims-made or specialty forms — use eroding limits where defense spending reduces what's left to pay a judgment.
- Even a frivolous lawsuit can generate tens of thousands of dollars in legal fees before it's dismissed.
- Your insurer generally controls the defense, meaning they choose the attorney and can settle claims without your approval in most standard policies.
- Understanding your policy's defense structure before a claim happens is the only time you have real leverage to negotiate better terms.
Defense Costs Under General Liability
Defense costs are the legal expenses an insurer pays to defend you against a covered claim — attorney fees, court costs, expert witness fees, and related charges. How those costs interact with your policy limits is one of the most consequential details in any general liability policy. Some policies pay defense costs in addition to your limits; others count them against the same pool of money that pays judgments and settlements.
The two structures are formally known as 'defense outside the limits' (also called supplementary payments) and 'defense inside the limits' (also called eroding or burning limits). ISO Commercial General Liability forms historically use a defense-outside-the-limits structure, but this varies by insurer and endorsement.
Why the Defense Cost Question Matters More Than Most Owners Realize
Most business owners buy a general liability policy and assume the coverage limit is what they'd have available to pay a judgment. What they don't think about — until a claim lands — is that getting to a judgment requires surviving a legal process that can take 18 months and cost $100,000 in attorney fees before anyone ever sees a courtroom.
That's the real problem with defense costs. They're not hypothetical. They're the first dollars out the door in almost every contested liability claim, and how your policy handles them will determine how much of your coverage is left standing when the dust settles.
The good news is that standard commercial general liability (CGL) policies have historically been structured to pay defense costs separately from policy limits. The bad news is that not every policy on the market follows that model — and the difference isn't always obvious from the declarations page.
Before we get into the mechanics, here's one thing worth stating plainly: the insurer's duty to defend is typically broader than its duty to pay a judgment. If a claim potentially falls within covered territory, most courts will require the insurer to step in and defend — even if it ultimately turns out the claim isn't covered. That's valuable protection, and it's one reason liability coverage deserves more attention than it usually gets. The legal cost problem with liability defense coverage is something that affects personal and business policies alike.
Two Models: Defense Outside vs. Defense Inside the Limits
Understanding how defense costs interact with your limits starts with knowing which of two structures your policy uses.
Defense Outside the Limits (Supplementary Payments Model)
Under the standard ISO CGL form — the one most admitted carriers use as a starting point — the insurer pays defense costs in addition to the policy limits. Your $1 million per-occurrence limit is reserved entirely for what you owe a claimant: settlements, judgments, and related damages. Legal fees, court costs, expert witnesses, and related expenses come out of a separate bucket.
This is the more favorable structure for policyholders. Even if your defense runs $200,000 over three years of litigation, your full $1 million limit is still on the table when the case resolves. This model is often referred to as a non-eroding or defense-outside-the-limits structure.
Defense Inside the Limits (Eroding Limits Model)
Some policies — particularly claims-made policies, professional liability hybrids, surplus lines products, and certain specialty coverages — use what's called an eroding or burning limits structure. Every dollar spent defending you comes out of the same limit that would pay a judgment.
Here's what that looks like in practice: you have a $1 million limit, the claim takes two years to litigate, and defense costs run $350,000. If you lose, you have $650,000 left to cover the judgment. If the judgment exceeds that, you're paying the difference personally — or your business is.
$54,000
Median defense cost for a small business liability claim
According to Insurance Journal analysis of commercial liability claim data, even routine slip-and-fall claims routinely generate five-figure defense costs before resolution.
60%
Of liability lawsuits that settle before trial
Regardless of settlement frequency, defense costs accumulate from the day a claim is filed — not from the day a case goes to trial.
3–5 years
Typical duration of a complex commercial liability lawsuit
Construction defect, product liability, and multi-party cases routinely run several years, compounding defense cost exposure under eroding limit policies.
$350+
Average hourly rate for commercial defense attorneys
Defense attorney billing rates in major markets have risen sharply, making legal fee exposure a primary concern for businesses with eroding limit policies.
This structure significantly changes the risk calculus for complex or prolonged litigation. It also creates a situation where your insurer has a financial incentive to settle early (since continuing to defend erodes the same pool that covers their exposure), which isn't always in your best interest.
Duty to Defend vs. Duty to Indemnify
The duty to defend and the duty to indemnify are separate obligations under a CGL policy, and the duty to defend is intentionally broader. An insurer must defend any claim that could potentially be covered — even if the facts eventually show it's not. The duty to indemnify only kicks in if a claim is actually covered and results in damages the insured is legally obligated to pay. This distinction matters because it means defense begins (and defense costs accumulate) even in cases where coverage may ultimately be denied.
Eroding Limits Are Common in Specialty Policies
If your business carries a standalone cyber liability policy, a professional liability policy, or an employment practices liability (EPL) policy alongside your CGL, check whether those policies use eroding limits — many do. Defense cost erosion is more common in specialty lines than in standard commercial liability coverage. Managing aggregate exposure across multiple eroding-limit policies is an important risk management consideration for any mid-size business.
What Standard CGL Supplementary Payments Actually Cover
Even in a defense-outside-the-limits policy, the insurer's obligation isn't unlimited. The ISO CGL form specifies what falls under supplementary payments — and what doesn't. Here's a breakdown of the typical inclusions:
- All court costs taxed against the insured in a covered suit
- Attorney fees and defense costs incurred by the insurer in defending the claim
- Premiums on appeal bonds and release-of-attachment bonds required in a covered suit
- Interest on judgments that accrues after the judgment is entered and before the insurer pays
- Up to $250 per day for actual lost earnings (not general loss of income) when the insurer requires you to attend hearings or trials
- Reasonable expenses incurred by the insured at the insurer's request in assisting with the defense
Notice what's not on that list: your own attorney if you hire independent counsel, costs related to uncovered claims bundled into the same lawsuit, or expenses you incur without the insurer's direction or approval. If you go out and retain your own lawyer without coordinating with the carrier, don't expect reimbursement.
One important nuance — supplementary payments apply to the covered claim, not to the entire lawsuit. If a plaintiff sues you for both a covered and an uncovered offense in the same action, the insurer is obligated to defend the whole suit initially, but cost allocation becomes contested over time. Some insurers will seek reimbursement for defense costs attributable to uncovered claims once the dust settles. Review your policy for reimbursement language if this scenario applies to your business.
Request a Defense-Outside-the-Limits Endorsement
If you're quoted a policy with eroding limits but prefer a non-eroding structure, ask whether a defense-outside-the-limits endorsement is available. Some carriers offer this as an add-on for an additional premium. For businesses in high-litigation industries, the cost of the endorsement is almost always justified by the protection it provides.
Document Every Carrier Communication During a Claim
Once a claim is filed, keep written records of every instruction, authorization, and decision your insurer communicates regarding the defense. If a coverage dispute arises later — particularly around defense cost reimbursement or settlement authority — your documentation of carrier directives will be critical. Don't rely on phone calls alone; follow up in writing.
Who Controls the Defense — and Why That Matters
Here's something a lot of policyholders don't fully absorb until they're in the middle of a claim: when an insurer has a duty to defend, they also typically have the right to control that defense. That means they choose the attorney, they direct litigation strategy, and in most standard CGL policies, they can settle a claim within your policy limits without your approval.
That last part is the one that catches people off guard. You could be a contractor who did impeccable work, absolutely certain the lawsuit against you is fraudulent — and your insurer can still settle it for $75,000 to make it go away, because that's cheaper than two years of litigation. The settlement goes on record, and you may feel like you admitted to something you didn't do.
Some policies include what's called a consent-to-settle clause, which requires the insurer to get your agreement before settling. This sounds like a policyholder-friendly feature, but it comes with a catch — the hammer clause. If you refuse to consent to a settlement the insurer thinks is reasonable, and the case proceeds and ultimately costs more than the settlement offer, you're responsible for the difference beyond what the insurer offered to pay. It's a significant financial lever.
“The insurer's right to control the defense is a double-edged sword. It removes a burden from the policyholder, but it also removes control. Business owners who don't understand that tradeoff before they buy a policy are often blindsided by it during a claim.”
— Douglas Richmond, Former attorney and commercial liability coverage author, published in the American Bar Association's tort and insurance practice publications
The practical takeaway: understand your policy's consent-to-settle language before a claim happens. If having a say in how claims against your business are resolved matters to you — and for most business owners it should — this is worth discussing with a broker when comparing policies.
For broader context on liability policy structures and limits, the personal liability coverage hub covers related concepts that apply across policy types.
Real-World Scenarios That Illustrate the Stakes
Abstract policy language is easier to digest when you see how it plays out in actual claim situations. The following scenarios aren't hypotheticals — they're the kinds of claims that show up regularly in commercial liability litigation.
What all of these scenarios share is that the defense cost structure — inside or outside the limits — becomes the deciding factor in whether the business survives the litigation financially intact. Knowing which structure you have is not optional information.
For a comprehensive look at what general liability won't cover in these and other situations, see what general liability insurance does not cover. There are significant exclusions that can leave businesses exposed even when defense coverage is solid.
How to Evaluate Your Policy's Defense Cost Structure
When you're reviewing a general liability policy — whether you're buying new coverage or renewing an existing one — here are the specific things to look for:
- Check the insuring agreement language
- Look for phrases like 'we will pay, in addition to the applicable limit of insurance' or 'defense costs are outside the limits.' These indicate a non-eroding structure. If the language says 'the limit of insurance includes defense costs' or 'defense costs reduce the limit,' you have an eroding policy.
- Review the declarations page for separate defense cost entries
- Some policies show a separate 'defense cost limit' or 'legal expense sublimit' on the declarations page, which is a signal that defense is carved out separately — though you should still confirm whether that sublimit erodes the main limit or sits alongside it.
- Read the supplementary payments section carefully
- In an ISO-based CGL, you'll find supplementary payments listed as a separate coverage section. If that section exists and is robust, you're likely in a non-eroding structure. If it's absent or minimal, dig deeper.
- Ask your broker directly
- Don't assume. Ask: 'If this claim takes $300,000 to defend over two years, does that $300,000 come out of my occurrence limit or is it paid on top of it?' The answer should be unambiguous.
If your policy uses eroding limits, the appropriate response isn't necessarily to switch carriers — it may be to purchase higher limits that account for realistic defense cost exposure, not just the size of a potential judgment. The real cost of underinsuring liability coverage explains why limit decisions have consequences that aren't always visible until a claim is in progress.
Also worth examining: advertising injury coverage inside general liability policies, which is a frequently overlooked part of CGL coverage that generates significant defense cost exposure for businesses with any kind of marketing presence.
Request a Defense-Outside-the-Limits Endorsement
If you're quoted a policy with eroding limits but prefer a non-eroding structure, ask whether a defense-outside-the-limits endorsement is available. Some carriers offer this as an add-on for an additional premium. For businesses in high-litigation industries, the cost of the endorsement is almost always justified by the protection it provides.
Document Every Carrier Communication During a Claim
Once a claim is filed, keep written records of every instruction, authorization, and decision your insurer communicates regarding the defense. If a coverage dispute arises later — particularly around defense cost reimbursement or settlement authority — your documentation of carrier directives will be critical. Don't rely on phone calls alone; follow up in writing.
The Bottom Line on Defense Costs
Defense costs are not a footnote in your liability policy. For many businesses — especially those in construction, healthcare-adjacent services, retail, or any client-facing industry — the cost to defend a claim will equal or exceed the eventual settlement or judgment. How your policy handles those costs is as important as the limit itself.
The standard ISO CGL form is structured in your favor on this point, paying defense outside the limits. But the insurance market is not monolithic. Specialty carriers, surplus lines products, claims-made forms, and even standard carriers with modified endorsements can flip that structure in ways that aren't immediately obvious from a summary or quote sheet.
My advice: don't buy any liability policy without understanding whether the limits are eroding or non-eroding, who controls the defense, and what your rights are around settlement decisions. If you can't get clear answers from the carrier or your broker, that's a problem worth solving before — not after — a lawsuit lands on your desk.
For businesses weighing whether to increase their coverage amounts, raising your personal liability limits walks through the cost-benefit math that applies across coverage types.
Frequently Asked Questions
All claims in this article are backed by peer-reviewed research. We follow strict editorial guidelines to ensure accuracy and reliability. Sources available on request from our editorial team.
