Defense-Within-Limits ("Eroding") Policies Explained
On an eroding policy, every dollar your insurer spends defending you is a dollar less to settle the claim. The limit can run out before the loss is paid.
Last reviewed: May 26, 2026 by the BizLeaseCheck Editorial Team
General information, not insurance or legal advice.
Overview
On a defense-within-limits (or "wasting" / "eroding") policy, defense costs are paid from — and reduce — the policy limit. On a defense-outside-limits policy, the insurer pays defense in addition to the limit.
Eroding limits are common in professional liability (E&O), D&O, and cyber, where defense costs are high. A long defense can exhaust the limit before any settlement is paid.
Topics to check
Each dollar of defense cost is subtracted from the available limit. A $1M limit with $400,000 of defense leaves $600,000 for the loss. If defense is heavy, the limit can be consumed before the claim is resolved.
Confirm whether defense is inside or outside the limit; it is one of the most important and least-noticed terms in a liability policy.
Insurance (Cornell LII Wex)Professional liability, D&O, and cyber claims often involve large defense costs, so an eroding limit is most dangerous there. A modest limit on an eroding policy may be inadequate once defense is factored in.
Compare the effective limit (limit minus expected defense) to your exposure, not just the headline limit.
Ask a licensed agent or broker whether defense-outside-limits coverage is available, whether a higher limit is warranted to absorb defense costs, and how the policy treats multiple claims against the eroding limit.
Adequacy of an eroding limit is a judgment call that depends on your exposure; confirm it with a licensed producer.
Key takeaways
- Defense-within-limits policies pay defense from the limit, reducing what is left.
- Eroding limits are common in E&O, D&O, and cyber, where defense is costly.
- A long defense can exhaust the limit before any settlement is paid.
- Compare the effective limit (limit minus defense) to your exposure.
- Ask about defense-outside-limits coverage or a higher limit.
Official resources
Coverage-review notes
Guide confidence marker: Confirm with a licensed agent or broker.
- Whether defense erodes the limit and whether the limit is adequate depend on the policy form and your exposure.
- Confirm the defense-cost structure and limit adequacy with a licensed agent or broker.
- This guide is general information from the BizLeaseCheck Editorial Team. It is not insurance advice or a coverage opinion; confirm coverage with a licensed agent or broker.
Frequently asked questions
What is an eroding or wasting insurance policy?
One where defense costs are paid from the policy limit and reduce it. The opposite is defense-outside-limits, where the insurer pays defense in addition to the limit. Eroding limits are common in E&O, D&O, and cyber.
Why does defense-within-limits matter?
Because heavy defense costs can exhaust the limit before the claim is paid, leaving little or nothing for a settlement. The effective limit is the stated limit minus expected defense costs.
Is this insurance or legal advice?
No. This is general, educational information to help you read your own policy — it is not insurance advice, a coverage opinion, or legal advice. Coverage depends on the exact policy form, endorsements, declarations, and state law, so confirm what a policy covers (and whether the limits are adequate) with a licensed insurance agent or broker, and read the actual policy.