Updated October 2026 to reflect Public Act 104-0792, which amended Section 12 of the Illinois Workers’ Compensation Act.
You were injured at work. Your doctor took you off duty. Days pass, then weeks, and your temporary total disability check has not arrived — or it was stopped without any explanation. Your request for medical treatment is sitting without authorization. You are wondering whether the insurance company can simply do nothing while you fall behind on your bills.
The answer is no. The Illinois Workers’ Compensation Act provides specific, enforceable penalties when an employer or its insurance carrier unreasonably delays, underpays, or withholds the benefits you are owed. Understanding these penalties — and how to trigger them — can make a meaningful difference in how quickly your claim moves and how much compensation you ultimately receive.
What the Rules Require from the Start
Illinois Commission Rule 9110.70 (Ill. Admin. Code Title 50) establishes a clear obligation. When an employee becomes unable to work due to a work-related injury, the employer or its insurance carrier has 14 calendar days from receiving notice of that inability to work to take one of three steps: begin paying temporary total disability (TTD) benefits; provide a written explanation of why benefits are being denied; or explain in writing what additional information is needed and why.
The same rule applies when an employer stops TTD payments before an employee has actually returned to work. The employer must provide a written explanation for the termination no later than the date of the last payment. If the employer denies liability for medical care, it must promptly notify the employee in writing of the basis for that denial.
These requirements are not suggestions. Failure to comply is a factor the Commission weighs directly when an injured worker petitions for penalty compensation.
Section 19(l): The Per Diem Penalty for Withholding Benefits
If you have made a written demand for payment of your medical benefits under Section 8(a) or your lost wage benefits under Section 8(b) of the Illinois Workers’ Compensation Act, and the insurance company fails or refuses to pay without good cause, Section 19(l) of the Act (820 ILCS 305/19(l)) requires the Commission to award you additional compensation of $30 for every day the benefits remain wrongfully withheld, up to a maximum of $10,000.
Section 19(l) contains two separate timing rules. First, once you make a written demand for TTD or medical benefits, the employer has 14 days after receiving it to explain the delay in writing (for medical bills, that period starts after the 30-day payment window in Section 8.2(d)). Second, any delay in payment of 14 days or more creates a rebuttable presumption that the delay was unreasonable, which shifts the burden to the insurance company to justify it. A written demand still matters, because it puts the insurer on notice and starts its response deadline, so it should go out as early as possible.
Section 19(k): The 50% Penalty for Vexatious Conduct
When the insurance company’s conduct goes beyond ordinary delay into what the law calls “unreasonable or vexatious delay” or an intentional underpayment of compensation, Section 19(k) of the Act authorizes the Commission to award additional compensation equal to 50% of the amount owed at the time of the award. In a case involving months of unpaid TTD benefits or a substantial permanent partial disability award, this can represent a significant sum.
Section 19(k) also applies when an insurance company pursues proceedings “which do not present a real controversy” — in other words, when the company contests a claim with no legitimate factual or legal basis. Frivolous defenses are themselves grounds for a penalty.
Section 16: Attorney’s Fees and Costs
Under Section 16 of the Illinois Workers’ Compensation Act, when the Commission finds that an employer or insurance carrier has been guilty of delay, unfairness, unreasonable or vexatious conduct, intentional underpayment, or frivolous defenses, it may also award attorney’s fees against the employer or insurer. Those fees are tied to the penalty itself: they are assessed on a Section 19(l) penalty and, in some cases, on a Section 19(k) penalty. A successful penalty petition does not make the insurance company responsible for all of your attorney’s fees in the case. The fee on your TTD, medical, or permanent partial disability award is still paid from your recovery as usual.
Together, these provisions add real cost to an unjustified delay: up to $10,000 under Section 19(l), an additional 50% of the amount payable at the time of the award under Section 19(k), and attorney’s fees on those penalties under Section 16. They are meant to deter bad-faith conduct, not to increase the value of the whole case.
A recent amendment adds another way penalty exposure can arise. For Section 12 examinations used to dispute whether treatment is reasonable and necessary, the exam and report must be provided to the employee or attorney and the treating provider within 90 days of the employer receiving the provider’s records. Since August 7, 2026, if the employer misses that deadline after receiving the records, it is rebuttably presumed responsible for Section 16 attorney’s fees and costs and for Section 19(l) additional compensation, whether the problem is a failure to authorize the treatment or a failure to pay for it. Read more in our post on Section 12 independent medical examinations in Illinois workers’ compensation cases.
What Triggers Penalties — and What Does Not
Penalties are not awarded simply because an insurance company disputes a claim. Illinois courts have drawn a clear line between legitimate disputes and bad-faith conduct. Simple mistakes, inadvertent errors, or genuine questions of law or fact do not result in penalties.
But when an insurance company takes a position it has no reasonable basis to take, the outcome can be different. In McDonald’s v. Illinois Workers’ Compensation Commission, 2022 IL App (1st) 210928WC, a McDonald’s worker injured herself pulling a box from a refrigerator. She went to the emergency room the same day. Her supervisor completed an incident report. The store owner acknowledged the accident. Despite overwhelming evidence that a work injury had occurred, McDonald’s contested the accident and the employee’s notice of the injury.
The Appellate Court affirmed penalties and attorney’s fees. The court held that an employer must have a genuine, reasonable basis for the position it takes — that “a position is not legitimate or reasonable simply because the Act allows it.” McDonald’s conduct, the court found, served no purpose other than to delay resolution and increase the time and cost imposed on the injured worker.
The standard is whether the insurance company’s conduct reflects deliberate bad faith or an improper purpose — not whether it was technically permitted to raise a defense.
What This Means for Your Claim
If your workers’ compensation benefits are delayed, there are concrete steps you can take. Make a written demand for payment as soon as possible — it starts the insurance company’s 14-day deadline under Section 19(l) to explain any delay in writing and helps preserve your right to per diem penalty compensation. Keep careful records of every denial, every phone call, and every instance of delayed authorization.
If your TTD benefits are terminated or your medical care is denied without a written explanation, that failure is itself a violation of Commission Rule 9110.70 and relevant evidence in a penalty petition. You are not required to wait indefinitely for an insurance company to do what the law already requires.
An experienced workers’ compensation attorney can identify when penalty provisions apply, make the written demands that trigger the statutory protections, and file petitions for penalties and attorney’s fees when the evidence supports them.
Learn more about medical-bill and treatment-authorization disputes in Illinois workers’ compensation claims.
Quick answer: What happens if the insurance company stops or delays my benefits? See this and other common Illinois workers’ compensation questions answered in one place.
If you have been injured at work and an insurance company is delaying or denying your benefits, the attorneys at The Law Offices of Millon & Peskin, Ltd. are here to help. We represent injured workers throughout the Chicagoland area, including DuPage, Cook, Will, Kane, and Lake counties. Contact us today for a free consultation to discuss your rights and your options. Our phone number is 630-260-1130.