There is no universal deadline. That is the honest answer, and the fact that most people searching this question are hoping for a specific number — thirty days, sixty days, some fixed period they can point to and say the insurer has violated — reflects a gap between how the legal system actually works and how most people assume it works. What exists instead of a universal deadline is a patchwork of state statutes, regulatory standards, and common law obligations that together define what “reasonable” looks like in claims handling, and that definition is the source of whatever leverage you actually have when an insurer goes quiet after receiving your demand. Understanding the structure of that obligation — what it requires, what violating it costs the insurer, and what you can do about it — is considerably more useful than any specific number.

Missouri’s Unfair Claims Settlement Practices Act, like comparable statutes in virtually every other state, requires insurers to acknowledge receipt of a claim within ten working days and to accept or deny coverage within a reasonable time after receiving proof of loss. The statute also prohibits insurers from failing to effectuate prompt, fair, and equitable settlements of claims where liability has become reasonably clear. None of those standards include a specific number of days for responding to a settlement demand letter, because the legislature deliberately used language that allows the standard to flex with the complexity of the claim rather than creating a fixed deadline that would apply equally to a straightforward fender-bender and a catastrophic injury case with disputed liability. What that means practically is that “reasonable” in a simple claim with clear liability and complete medical documentation looks very different from “reasonable” in a complex claim involving multiple parties, coverage disputes, and ongoing treatment.

In practice, demand letters in personal injury cases typically include a response deadline set by the plaintiff’s attorney — most commonly thirty days, sometimes longer for complex cases, occasionally shorter in time-sensitive situations. That deadline is not statutory. It is contractual and strategic, set by the attorney based on the nature of the claim and the posture they want to take with the insurer. The significance of that deadline depends entirely on what it is attached to. A demand letter with a thirty-day deadline that includes explicit language stating that the offer will be withdrawn and litigation will commence if no response is received by the stated date carries weight when the attorney sending it has a documented history of doing exactly that. The same deadline attached to a demand from an attorney whose prior demands have expired without consequence carries essentially no weight at all. Adjusters talk to each other and they talk to defense attorneys, and they know within their networks which plaintiff firms treat deadlines as real and which treat them as opening positions in a timeline negotiation.

Here is what most people do not understand about what happens when a demand deadline passes: the insurer has not necessarily done anything legally actionable simply by missing it. Missing a deadline set in a demand letter does not, by itself, constitute bad faith. It does not trigger a penalty. It does not automatically expose the insurer to excess liability. What it does is become part of a pattern of conduct that, combined with other evidence of unreasonable delay or inadequate investigation, can support a bad faith claim. A single missed demand deadline in a complex case where the adjuster was waiting on medical records means very little. A missed demand deadline in a case with clear liability and complete documentation, following months of prior delay, preceded by multiple unanswered communications, and accompanied by an offer dramatically below documented specials, is a bad faith record. The difference between those two situations is the difference between an insurer who is exercising legitimate claims handling discretion and one who is deliberately stringing a claimant along for financial advantage.

The mechanism that gives a demand deadline real legal teeth — the one worth understanding in specific terms — is the policy limits demand in cases where your documented damages approach or exceed the available coverage. When an injured person’s attorney sends a formal policy limits demand supported by medical records demonstrating that damages likely exceed the policy, the insurer is placed in a legally significant position. If they fail to tender limits within the deadline and the case subsequently goes to verdict for an amount exceeding the policy, the insurer may be liable to their own insured for the excess judgment under bad faith theories. Missouri courts have recognized this exposure, and so have courts in the overwhelming majority of states. The insurer’s obligation in that situation is not just to the injured claimant — it is to their own policyholder, whose personal assets are at risk for any verdict above the policy limit. That dual obligation creates a pressure that a standard demand for a specific dollar amount below policy limits does not create, and it is why policy limits demands with documented liability and documented damages tend to produce faster and more serious responses than ordinary settlement demands.

What you can do when an insurer has not responded to your demand within the deadline you or your attorney set depends on what stage of the process you are in and what your next move actually is. If your attorney sent a thirty-day demand with explicit language about litigation commencing upon expiration, and thirty days have passed with no meaningful response, the next move should be filing suit. Not sending a follow-up letter with a new deadline. Not calling the adjuster to ask what is going on. Filing. The pattern of sending deadlines that expire into new deadlines is one of the most common ways plaintiffs’ attorneys inadvertently teach insurers that their deadlines are not real, and once that lesson is learned it is very difficult to unlearn within the same claim. An insurer who has watched three demand deadlines pass without consequence will not take the fourth one seriously regardless of the language attached to it.

There is a regulatory avenue that runs parallel to the litigation track and that most claimants never use. Every state has an insurance regulatory agency empowered to investigate complaints against insurers for violations of claims handling standards. In Missouri, that is the Department of Commerce and Insurance. A formal complaint documenting the timeline of your claim — when the demand was sent, what deadline was given, what response was received and when, what the documented damages were at the time of the demand — creates an administrative record that the insurer must respond to and that regulators can use to assess whether the claims handling met the statutory standard. This process does not produce a settlement and it does not move quickly. But it creates external pressure and external documentation that occasionally accelerates an insurer’s engagement with a claim, and it costs you nothing to pursue alongside whatever litigation strategy your attorney is implementing.

The timing of your demand letter matters in ways that most people do not think about before sending one, and getting the timing wrong is one of the most common reasons cases take longer to resolve than they should. A demand letter sent before your medical treatment is complete, before you have reached maximum medical improvement, or before all of your records and bills have been gathered is a demand that either cannot be evaluated properly or will be evaluated based on incomplete information that understates your damages. The insurer may respond to it — sometimes they respond quickly to early demands precisely because they know the number is low — but responding is not the same as resolving the claim at full value. An early demand that produces an early offer often produces an offer that looks reasonable against the information available at the time and proves inadequate against the full picture that emerges after treatment ends. Sending the demand at the right moment, with a complete package, is what creates the pressure and the evidentiary foundation that makes the deadline meaningful rather than performative.

If you are not yet represented by an attorney and you sent a demand letter yourself, the realistic assessment is that the insurer is not experiencing significant pressure from your deadline. Adjusters handle unrepresented claimants differently than represented ones, and not in the claimant’s favor. They know that an unrepresented person cannot file suit with the same efficiency as a law firm, that the threat of litigation is more remote, and that the claimant is more likely to be worn down by delay than to escalate. If you sent a demand that has not been responded to, the most productive move is to consult with a personal injury attorney before deciding what to do next. Many will review your situation at no charge, and the change in the insurer’s behavior that typically follows attorney retention is often immediate and significant — not because attorneys are magic, but because the adjuster’s risk calculation changes the moment a plaintiff attorney’s name appears on a file.

The practical takeaway is this: there is no law requiring an insurer to respond to your demand within any specific number of days in most jurisdictions, but there is a body of law requiring them to handle your claim in good faith and within a reasonable time, and the consequences of violating that standard can be severe enough that a credibly communicated threat of those consequences produces movement in cases that had been sitting still. Build your demand package completely before sending it. Set a real deadline and treat it as real. Make sure your attorney is prepared to file when the deadline passes. Document every communication and every non-response. And understand that the question of how long they have to respond is ultimately less important than the question of what happens when they do not — because it is the answer to that second question, clearly and credibly communicated through your attorney’s conduct, that actually determines how fast your case moves.

This article is for general informational purposes only and does not constitute legal advice. Insurance claims handling statutes, bad faith standards, and regulatory procedures vary significantly by state and by the specific facts of your situation. If you have sent a demand letter and are not receiving a response, consult with a licensed personal injury attorney in your state as soon as possible.