Illinois Car Insurance Claim Laws

How long insurers have to handle your car insurance claim in Illinois, when a car counts as a total loss, and what to do if the insurer falls behind.

Last reviewed October 24, 2026 by Ali Ahmad, MyAutoTriage editor.

Short answer

In Illinois an insurer must acknowledge your claim within 15 working days, accept or deny it with no fixed deadline (a reasonable time); written delay notice after 40 days, and pay within 30 days after liability is accepted. Total loss rule: the insurer decides when repairs are uneconomical; state law sets no fixed percentage. Deadline to file an injury lawsuit: 2 years.

Claim-handling deadlines in Illinois

Acknowledge your claim	15 working days
Accept or deny it	No fixed deadline (a reasonable time); written delay notice after 40 days
Pay after agreement	30 days after liability is accepted

Rule: Ill. Admin. Code tit. 50, §§ 919.40, 919.50(a), 919.80(b)(2).

The decision clock usually starts once the insurer has the proof of loss it asked for, not on the day of the accident. Ask the adjuster in writing what they still need, and keep a dated log of everything you send.

When a car is totaled in Illinois

The insurer decides when repairs are uneconomical; state law sets no fixed percentage. Illinois' 50% and 70% figures apply only to certain owners such as dealers, fleets and lienholders.

In practice most insurers apply the total loss formula: a car worth $15,000 with $3,000 of salvage value is usually totaled once repairs reach about $12,000. Ask the adjuster which test they used and for the valuation report.

Rule: 625 ILCS 5/3-117.1(a)(1).

If the insurer misses a deadline or lowballs you

Send a short written follow-up that names the deadline and asks for a decision by a specific date.
If the offer is low, answer with evidence: repair estimates, comparable cars for sale, receipts.
Still stuck? File a free complaint with the Illinois Department of Insurance.

If you have to sue the other driver in Illinois

Most claims settle without a lawsuit, but these rules decide how much leverage you have when you claim against the at-fault driver's insurer.

If you were partly at fault	Modified comparative fault (51% bar)
Deadline to sue for injuries	2 years
Deadline to sue for car damage	5 years

Your recovery is cut by your share of the fault, and you get nothing if you are more at fault than the other side (51% or more).

The lawsuit deadline (statute of limitations) usually runs from the accident date, and an open insurance claim does not pause it.

Rules: 735 ILCS 5/2-1116; 735 ILCS 5/13-202, 5/13-205.

Sales tax and fees on a total loss in Illinois

If you buy or lease a replacement within 30 days of the settlement, the insurer pays sales tax, transfer and title fees on up to the total-loss value. Rule: Ill. Admin. Code tit. 50, § 919.80(c).

Total loss tax and fee rules in every state

Diminished value in Illinois

From the at-fault driver's insurer: Yes, if you can prove it. Trailmobile Div. v. Higgs, 297 N.E.2d 598 (Ill. App. Ct. 1973).
From your own insurer: No, under standard "repair or replace" wording. Sims v. Allstate Ins. Co., 851 N.E.2d 701 (Ill. App. Ct. 2006).

Diminished value rules in every state

Claim laws in nearby states

If the accident happened in another state, or the other driver is insured there, these rules may matter too:

Indiana: Insurer decides (no fixed %); decision with no fixed deadline (a reasonable time)
Wisconsin: 70% of value; decision with no fixed deadline (a reasonable time)
Missouri: 80% of value; decision within 15 working days after claim forms are submitted

Free tools for your claim

Not legal, financial, or insurance advice. This page summarises rules and data for general education only. Insurance laws, deadlines, and formulas vary by state, by policy, and by insurer, and they change over time. Verify anything important with your insurance policy, your state department of insurance, or a licensed attorney before relying on it. Some of these rules apply only to certain claim types.

Frequently asked questions

How long does an insurance company have to pay a claim in Illinois?

In Illinois the insurer must accept or deny the claim with no fixed deadline (a reasonable time); written delay notice after 40 days, and pay within 30 days after liability is accepted. The clock generally starts once the insurer has the proof of loss it asked for, so keep a dated record of what you sent.

When is a car considered totaled in Illinois?

In Illinois: the insurer decides when repairs are uneconomical; state law sets no fixed percentage. Illinois' 50% and 70% figures apply only to certain owners such as dealers, fleets and lienholders. You can challenge the actual cash value the insurer uses.

How long do I have to sue after a car accident in Illinois?

In Illinois you generally have 2 years from the accident to file an injury lawsuit and 5 years to sue for damage to your car. An insurance claim does not pause this deadline, so if talks drag on, check the date and speak to a lawyer well before it passes.

Can I recover if I was partly at fault in Illinois?

Illinois follows modified comparative fault (51% bar). Your recovery is cut by your share of the fault, and you get nothing if you are more at fault than the other side (51% or more).

What can I do if my insurer misses a deadline in Illinois?

Send a written follow-up citing the rule and asking for a decision by a specific date. If that fails, file a free complaint with the Illinois Department of Insurance; a pattern of missed deadlines can also support a bad-faith claim.