Proving an Insurer Acted in Bad Faith: What Policyholders Must Actually Show

Most denied insurance claims do not become bad-faith cases. That is not because insurers always behave reasonably — it is because the legal threshold for proving bad faith is meaningfully higher than the threshold for proving the carrier got the claim wrong. Policyholders who confuse the two often pursue litigation, expecting extracontractual damages that the evidence cannot support.

Understanding what the policyholder must actually demonstrate — separate from showing that coverage applies — is essential before deciding whether a denied claim is worth taking beyond a straight breach-of-contract action. The evidentiary picture matters far more than the policyholder’s sense of having been treated unfairly.

The Two-Layer Problem

A first-party bad-faith case has two layers stacked on top of each other.

The first layer is the underlying coverage dispute: Did the policy cover the loss? This is a contract question. The policyholder produces the policy, documents the loss, and shows that the loss falls within insuring agreements and outside applicable exclusions. If the carrier wrongly denied a covered claim, the policyholder is entitled to the policy benefits — full stop.

The second layer is the conduct question: Was the carrier’s denial unreasonable, vexatious, or made in bad faith? This is a separate inquiry, with its own evidentiary requirements, that focuses on how the carrier reached its decision rather than whether the decision was correct.

Courts generally refuse to collapse these layers. A carrier can be wrong about coverage without having acted in bad faith. The question is not whether the carrier ultimately loses on the merits, but whether the carrier had a reasonable basis for the position it took during the claims process.

What “Reasonable Basis” Actually Means

The phrase “reasonable basis” does most of the work in bad-faith doctrine, and it is consistently misunderstood.

A reasonable basis does not require the carrier to be right. It requires the carrier to have a position that a reasonable insurer, in possession of the same information, could plausibly adopt. The position can be wrong. It can lose at trial. It can even reflect a strained reading of policy language. None of that necessarily makes it unreasonable.

What courts tend to scrutinize instead is the process by which the carrier reached its position:

• Did the adjuster investigate the loss adequately before denying?
• Did the carrier interview witnesses, inspect the property, and request documents in a timely way?
• Did the carrier evaluate the claim against the actual policy language, or against assumptions about what the policy “must” mean?
• Did the carrier engage with information the insured provided, or dismiss it without analysis?
• Did the carrier obtain qualified expert input when the claim required it?

A denial that follows a thorough, documented investigation is hard to attack as bad faith even when it turns out to be wrong. A denial that issues quickly, without meaningful inquiry, is far more vulnerable — because the absence of process is itself evidence that the carrier was not seriously trying to evaluate the claim.

The Statutory Path in Illinois

Illinois provides a statutory remedy for vexatious and unreasonable insurer conduct under Section 155 of the Illinois Insurance Code, which authorizes recovery of attorney’s fees, litigation costs, and additional damages capped at 60% of the judgment amount or $60,000, whichever is less. The statute is designed to make improper denial more expensive than payment, and it operates as an additional remedy in an action on the policy rather than as a freestanding cause of action.

The doctrine that has developed around the statute focuses on the carrier’s conduct, not the outcome. A bona fide coverage dispute — one where the parties have legitimate, defensible disagreements about policy interpretation or factual proof — generally does not support recovery, even if the carrier ultimately loses. The statute targets denials that lack a reasonable foundation: denials issued without adequate investigation, denials premised on misrepresentations of policy terms, denials that ignore evidence the insured provided, or denials accompanied by tactics designed to wear the policyholder down.

For a closer look at the kind of conduct courts scrutinize under this framework, see what Illinois courts treat as a vexatious and unreasonable denial when evaluating insurer behavior in first-party disputes.

Building the Evidentiary Record

Policyholders rarely arrive at counsel’s office with a ready-made bad-faith case. The record has to be built — and much of it has to come from the carrier’s own files.

The most important source of evidence in a bad-faith case is the carrier’s claim file. This includes adjuster notes, internal communications, reserve calculations, expert reports the carrier obtained, communications with coverage counsel, and the chronology of how the claim was handled. Carriers do not produce these voluntarily; they are obtained through discovery once litigation is filed.

Other meaningful evidence often includes:

• The insured’s own documentation showing what was provided to the carrier and when
• Correspondence from the carrier requesting documents already supplied
• Discrepancies between the carrier’s stated reasons for denial and the policy language
• Patterns showing the carrier handled similar claims differently
• Expert testimony about industry claims-handling standards

State insurance regulators, including the Illinois Department of Insurance, publish guidance on prompt and fair claims-handling expectations, and those standards can inform what a reasonable insurer would have done in comparable circumstances.

Common Mistakes Policyholders Make

Three errors recur in cases that should have been bad-faith claims but were not effectively pursued.

The first is treating frustration as evidence. Being denied unfairly feels like bad faith to the person living through it. But subjective sense of unfair treatment, without documentation of the carrier’s process, will not satisfy the legal standard.

The second is failing to preserve communications. Policyholders often handle the early stages of a denial themselves, by phone, without records. By the time they consult counsel, key conversations exist only in memory. Carriers, by contrast, document everything internally — and that documentation will be the centerpiece of their defense.

The third is settling too early. Once a policyholder accepts a settlement and signs a release, the bad-faith leverage is generally gone. Policyholders who suspect bad faith should evaluate that exposure before resolving the underlying coverage dispute, not after.

The Practical Standard

Whether an insurer’s conduct rises to the level of bad faith is, ultimately, a question that turns on the documentary record and how it reads to a court. Carriers that follow defensible processes — investigation, documentation, contemporaneous reasoning — are difficult to pursue successfully even when they reach wrong conclusions. Carriers that cut corners on process expose themselves to extracontractual remedies that significantly change the litigation calculus.

For policyholders facing a denied or substantially underpaid claim, the right question is not whether the denial feels unfair. It is whether the carrier’s conduct, viewed against industry standards and the documentary record, can support a finding that the denial lacked a reasonable foundation. That is a legal judgment, made on evidence,