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Property and Casualty Insurance · Casualty Insurance · 6 min read

Defending Against Negligence Claims

In this lesson you will
  • Distinguish between contributory negligence and the variations of comparative negligence.
  • Explain how assumption of risk, intervening causes, and statutes of limitations limit or eliminate liability.
  • Identify common law defenses including immunities, sudden emergency, and the duty to defend under liability policies.

Contributory and Comparative Negligence

When an injured person files a lawsuit alleging negligence, the defendant may raise legal arguments known as defenses to reduce or eliminate liability. Understanding negligence defenses helps an insurance producer evaluate a policyholder's potential legal exposure and coverage needs. Under common law, one of the earliest defenses developed was contributory negligence. This strict doctrine bars an injured party from recovering any damages if their own negligence contributed to the injury. Under pure contributory negligence, an injured party who is even one percent at fault receives zero financial recovery, regardless of how negligent the defendant was.

To soften this harsh outcome, some contributory negligence jurisdictions recognize the last clear chance doctrine. Under the last clear chance doctrine, an otherwise barred negligent plaintiff may recover damages if the defendant had the final opportunity to avoid the accident and failed to do so. However, because pure contributory negligence often produces severe outcomes, most states have replaced it with some form of comparative negligence. Comparative negligence assigns percentages of fault to each party involved and generally reduces a plaintiff's recovery by their own percentage of fault.

Comparative negligence operates primarily under two distinct systems: pure comparative negligence and modified comparative negligence. Under pure comparative negligence, a plaintiff may recover a reduced amount even if they bear most of the fault, though they cannot recover from a defendant who bears no fault at all. For example, in a pure comparative negligence state, a plaintiff who is 80 percent at fault can still recover 20 percent of their damages from the defendant. Under modified comparative negligence, state law sets a fault cutoff: some rules bar recovery at 50 percent fault, while others bar recovery when the plaintiff's fault exceeds 50 percent.

Under modified comparative negligence, two common threshold rules exist. One common rule bars recovery if the plaintiff is 50 percent or more at fault. Another common rule allows recovery if the plaintiff's fault is 50 percent or less, but bars recovery if it exceeds 50 percent. Under modified comparative negligence, a plaintiff recovers nothing if their fault reaches the level that bars recovery under that state's rule. Whenever a plaintiff is permitted to recover under any comparative negligence system, their total damage award is reduced by their own percentage of fault.

Comparison of Negligence Systems
Defense SystemRecovery Rule When Plaintiff Is at FaultOutcome if Plaintiff Is 51% at Fault
Pure Contributory NegligenceAny fault bars recovery completelyZero recovery
Pure Comparative NegligenceRecovery reduced by plaintiff's percentage of faultRecovers 49% of total damages
Modified Comparative Negligence (50% Bar)Recovery allowed only if fault is less than 50%Zero recovery
Modified Comparative Negligence (51% Bar)Recovery allowed if fault is 50% or lessZero recovery
Exam tip. Pay close attention to the specific numbers in exam scenario questions. If a question states that an injured driver was 50 percent at fault in a modified comparative negligence state with a 50 percent bar, that driver recovers nothing. If the state uses a 51 percent bar, the driver at 50 percent fault can recover 50 percent of their damages.

Common mistakes

  • Assuming that under pure comparative negligence, a plaintiff who is mostly at fault cannot recover any damages.
  • Confusing a statute of limitations with a statute of repose; a statute of limitations usually runs from the injury date or its discovery, whereas a statute of repose runs from an outside event like a product sale.
  • Believing that an intervening criminal act always relieves the original defendant of liability, even when the criminal act was entirely foreseeable.
  • Thinking an insurer only owes a defense if the claimant's lawsuit is proven valid, when a policy's duty to defend can apply to potentially covered allegations even if they are groundless, false, or fraudulent.

Key points

  • A defense against negligence is a legal argument raised by a defendant to reduce or eliminate legal liability.
  • Pure contributory negligence completely bars recovery if the plaintiff shares any fault, whereas comparative negligence systems reduce recovery based on fault percentages.
  • Assumption of risk requires that the plaintiff knew of, appreciated, and voluntarily chose to encounter a danger, whether by express agreement or implied conduct.
  • An intervening cause occurs after the original act and contributes to the injury, but it relieves the original actor of liability for the resulting harm only if it qualifies as a superseding cause that breaks the chain of proximate causation.
  • Statutes of limitations set deadlines for filing lawsuits based on state law, which may be adjusted by the discovery rule or tolling provisions.
  • Statutes of repose establish outside deadlines tied to specific events, such as a product sale, potentially barring lawsuits regardless of injury discovery dates.
  • A liability policy with a duty to defend generally obligates the insurer to defend a lawsuit alleging potentially covered damages, even if the allegations are groundless, false, or fraudulent, subject to the policy's terms.

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Original lesson written for Property and Casualty Insurance practice · updated October 29, 2026. Exam names are trademarks of their owners; tests.global is not affiliated with them.