Illinois auto insurance claim laws set three things that shape every payout: the coverage each driver must carry, a 50% fault ceiling that can wipe out your recovery entirely, and firm deadlines on both you and the insurer. Get the fault question and the timing right and most of the rest follows.
The 50% Fault Cutoff That Decides Your Claim
Illinois follows modified comparative negligence. If you’re found more than 50% responsible for the crash, you recover nothing. At 50% or below, you can still collect, but your award is reduced by your share of the blame.1Illinois General Assembly. Illinois Compiled Statutes 735 ILCS 5/2-1116
The math is unforgiving at the edge. On $100,000 in damages, a driver 20% at fault collects $80,000, and one at 49% still collects $51,000. Push that number to 51% and the payout drops to zero. That’s why fault percentage is the most contested part of most Illinois claims. Adjusters know the cliff exists, and shifting your share above 50% is the cleanest way for an insurer to deny the claim outright. Every conversation with an adjuster, every recorded statement, every early admission about what happened feeds into that allocation.
How Long You Have to Act
You have two years from the date of the crash to file a personal injury lawsuit in Illinois.2Illinois General Assembly. Illinois Compiled Statutes 735 ILCS 5/13-202 Property damage claims get five years.3Illinois General Assembly. Illinois Compiled Statutes 735 ILCS 5/13-205 Miss the deadline and the court dismisses the case permanently.
The clock doesn’t always start on the crash date. Illinois recognizes a discovery rule: if an injury wasn’t immediately apparent and couldn’t have been detected through reasonable diligence, the limitations period starts when you knew or should have known about both the injury and its connection to someone else’s negligence. Soft tissue injuries and internal damage that surface weeks later can fall into this category. The clock is also paused for minors; a child injured in a crash doesn’t face the two-year countdown until turning 18.
These deadlines govern lawsuits, not the insurance claim itself. You can file a claim with an insurer at any time. But once the statute of limitations expires, your leverage evaporates, because the insurer knows you can no longer take the case to court.
Coverage You (and the Other Driver) Must Carry
Every vehicle registered in Illinois must carry liability insurance meeting the minimums in the Illinois Vehicle Code: $25,000 for bodily injury or death of one person, $50,000 per accident when two or more people are hurt, and $20,000 for property damage.4Illinois General Assembly. Illinois Compiled Statutes 625 ILCS 5/7-203 A serious crash can easily blow past those numbers, which is why the minimums are a floor rather than a target.
Illinois also mandates uninsured motorist coverage on every auto policy. UM bodily injury limits must match the Section 7-203 minimums. UM property damage is required up to the actual cash value of your vehicle or your policy’s UM property damage limit, whichever is less, with a maximum $250 deductible.5Illinois General Assembly. Illinois Compiled Statutes 215 ILCS 5/143a This is the coverage that pays when the other driver has no insurance or flees the scene.
If your uninsured motorist coverage exceeds the Section 7-203 minimums, your policy must include underinsured motorist coverage in an equal amount.6Illinois General Assembly. Illinois Compiled Statutes 215 ILCS 5/143a-2 Underinsured coverage fills the gap when the at-fault driver has insurance but not enough to cover your losses. Carry $100,000 in UM bodily injury coverage and you also get $100,000 in underinsured motorist protection.
What the Insurer Must Do After You File
Illinois Administrative Code Part 919 sets minimum standards for how insurers handle claims and defines conduct that, done frequently enough, constitutes an unfair claims practice.7Illinois General Assembly. Illinois Administrative Code 50 Ill. Admin. Code 919 The deadlines for a written delay explanation depend on the claim type:
- General claims: 45 days after you reported the claim.
- First-party auto physical damage: 40 calendar days.
- Auto property damage liability (third-party): 60 calendar days.
Once one of those deadlines passes without resolution, the insurer must send a written explanation for the delay that provides a reasonable reason for the holdup. The process ends when the insurer either accepts the claim with a settlement offer or denies it with specific justifications. Keep copies of every submission confirmation, letter, and email. A paper trail is what gives a later complaint any weight.
Diminished Value
Even after professional repairs, a vehicle with a crash on its history is worth less than an identical car without one. Illinois allows a diminished value claim against the at-fault driver’s insurance for the difference between what your vehicle was worth before the crash and what it’s worth after repairs. The five-year property damage statute of limitations applies.3Illinois General Assembly. Illinois Compiled Statutes 735 ILCS 5/13-205
You need to show the other driver was at fault and that your vehicle lost measurable market value despite being repaired. An independent appraisal comparing pre-crash and post-repair values is the standard way to document the loss. Insurers rarely raise this on their own. You typically have to make a separate written demand with supporting documentation.
What You Won’t Keep: Taxes, Medicare, and Health Plan Liens
The number on the settlement check isn’t the number you keep. Federal tax law excludes damages received for personal physical injuries or physical sickness from gross income, covering compensation for medical bills, pain and suffering tied to a physical injury, and future medical costs.8Office of the Law Revision Counsel. 26 USC 104 – Compensation for Injuries or Sickness Other parts of a settlement are taxable:
- Punitive damages are always taxable, regardless of whether the underlying claim involves physical injury.
- Lost wages are taxed as ordinary income even when paid within a personal injury settlement.
- Interest earned on the settlement amount is taxable.
- Emotional distress unrelated to physical injury is taxable, though you can exclude amounts up to what you actually paid for medical care related to that distress.
If your settlement includes both taxable and nontaxable components, the settlement agreement should break out each category separately. Lumping everything together gives the IRS reason to treat the full amount as taxable income.9Internal Revenue Service. Tax Implications of Settlements and Judgments One trap: if you deducted medical expenses on a prior year’s return and your settlement later reimburses those same expenses, that reimbursed portion is taxable up to the amount of the deduction.
Medicare has its own claim on your money. The Medicare Secondary Payer Act gives the federal government a right of reimbursement from any settlement or award involving a Medicare-eligible claimant. Insurers must report these claims to the Centers for Medicare and Medicaid Services and face a $1,000-per-day fine for failing to do so. If CMS has to sue to recover what it paid, it can collect double.
Employer-sponsored health plans governed by ERISA generally hold similar reimbursement rights and expect to recover the full amount they paid for accident-related treatment once your settlement arrives. These plans are generally exempt from state rules that might otherwise limit health insurer clawbacks. Before accepting an offer, find out how much of it is already spoken for.
Getting Your Deductible Back Through Subrogation
When you file under your own collision coverage after another driver hits you, you pay your deductible and your insurer covers the rest. Your insurer then pursues the at-fault driver’s insurance to recover what it paid, including your deductible. This is subrogation, and it happens largely in the background.
If subrogation succeeds, some or all of your deductible comes back to you. How much depends on the fault allocation; if you were partially at fault, the deductible recovery is reduced proportionally. Signing a waiver of subrogation, which some contracts include, blocks your insurer from pursuing the other party and gives up your shot at recovering the deductible. Read that language before signing.
When the Insurer Won’t Cooperate
If an insurer ignores the Part 919 deadlines, lowballs a claim, or refuses to explain a delay in writing, you can file a complaint with the Illinois Department of Insurance. The department accepts complaints through its online help center or by submitting a property and casualty complaint form by email or mail.10Illinois Department of Insurance. How to File a Complaint The department won’t act as your lawyer or force a specific settlement, but a pattern of complaints can trigger a regulatory examination under Part 919’s unfair claims practices standards.7Illinois General Assembly. Illinois Administrative Code 50 Ill. Admin. Code 919
Most Illinois auto claims handled by attorneys run on contingency, typically 25% to 40% of the recovery. You pay nothing upfront and the fee comes out of the settlement. Straightforward property damage with clear liability is often manageable on your own. When injuries are significant, fault is disputed, or the insurer has already blown past its regulatory deadlines, a lawyer who knows the comparative negligence rules and the administrative code can usually recover well above the insurer’s first offer.