Diminished Value

Diminished Value Claims in Illinois: What You Need to Know

By CCA Team · September 20, 2026

If you’ve been in a car accident in Illinois and the other driver was at fault, your vehicle may have lost significant market value — even after repairs. This loss is called diminished value, and in Illinois, you have the legal right to recover it.

Whether you’re in Chicago, Aurora, Naperville, Rockford, Springfield, or anywhere else in IL, this guide covers everything you need to know about filing a diminished value claim in Illinois — including deadlines, your rights, and how to fight back when the insurance company says no.

What Is Diminished Value?

Diminished value (DV) is the difference between what your vehicle was worth before the accident and what it’s worth after repairs. Even when a car is fixed perfectly, the accident history follows it. Buyers pay less for vehicles with accident reports. That gap is real money you’ve lost — and the at-fault driver’s insurance company owes it to you.

Think of it this way: would you pay the same price for two identical cars if one had been in a wreck and the other hadn’t? Neither would anyone else. That’s diminished value.

Illinois Diminished Value Laws

Illinois requires insurers to handle auto claims fairly and in good faith. For total loss vehicles, insurers must establish ACV using comparable sales in the Illinois market and must provide written documentation of how the value was calculated. If you disagree with the insurer’s valuation, you have the right to present your own evidence, and your policy may include an appraisal clause that may be available as a formal mechanism to resolve the dispute outside of court.

Diminished value is a recognized claim in Illinois. Third-party tort claimants — those pursuing the at-fault driver’s insurer — can claim DV as part of their property damage. Illinois courts have recognized DV as a recoverable component of damages. First-party DV against your own insurer is less established and depends on policy wording. Illinois’s Unfair Claims Settlement Practices statute (215 Ill. Comp. Stat. 5/154.6) requires insurers to act reasonably and prohibits delays and lowball offers.

Illinois’s large used-vehicle market — particularly in Chicagoland — means strong comparable data is typically available. An independent appraisal ensures that data is properly interpreted and presented in support of your claim, whether you are challenging a total loss ACV or documenting the diminished value of a repaired vehicle for a third-party settlement.

Key facts for Illinois:

Statute of Limitations: 5 years from the date of the accident to file a property damage claim, including diminished value
DV Claim Type: Third-Party — you file against the at-fault driver’s insurance, not your own
Regulatory Authority: Illinois Department of Insurance — https://insurance.illinois.gov
Unfair Claims Practices: Unfair Claims Settlement Practices (215 Ill. Comp. Stat. 5/154.6)

Who Can File a Diminished Value Claim in Illinois?

In Illinois, you can file a DV claim if:

You were not at fault for the accident (or the other driver shares fault)
Your vehicle was repaired (not totaled)
The accident is within 5 years
Your vehicle had no prior accident history (prior damage can reduce your DV claim)

You file against the at-fault driver’s liability insurance — not your own collision coverage. This is a third-party property damage claim, and it does not affect your own insurance rates.

How to File a Diminished Value Claim in Illinois

Document everything: Get the police report, repair estimate, repair invoice, and photos of the damage before and after repairs.
Get an independent diminished value appraisal: This is your most important piece of evidence. A certified appraiser establishes the actual loss in market value using comparable sales data. Without this, the insurance company will use their own formula — which almost always undervalues your claim.
Submit a demand letter: Send a written demand to the at-fault driver’s insurance company with your appraisal attached. Be specific about the amount and include your supporting documentation.
Negotiate: The insurer will likely counter with a lower number. This is normal. Your appraisal gives you the documentation to push back.
Escalate if needed: If the insurer refuses to negotiate in good faith, you can file a complaint with the Illinois Department of Insurance, pursue small claims court, or invoke the appraisal clause if applicable.

How Much Is My Diminished Value Claim Worth?

Every claim is different. The value of your DV claim depends on:

Vehicle age and mileage: Newer vehicles with lower miles lose more value
Make and model: Luxury and high-demand vehicles typically have higher DV
Severity of damage: Structural damage and airbag deployment cause more value loss
Repair quality: Poor repairs or visible signs of repair increase DV
Pre-accident condition: A well-maintained vehicle in excellent condition has more to lose

The only way to know your actual diminished value is to get an independent appraisal based on real market data — not a formula.

Common Insurance Tactics in Illinois

Insurance companies don’t like paying diminished value claims. Here’s what to watch for:

“We don’t pay diminished value” — Not true. If their insured was at fault, they owe it under Illinois tort law.
The 17c formula: Some carriers use State Farm’s outdated 17c formula, which can undervalue your claim by 70-90%. This formula has been widely criticized and is not an industry standard.
Delay tactics: Hoping you’ll give up or miss your 5-year deadline.
“Your car was fully repaired”: Repair quality has nothing to do with diminished value. The accident history exists regardless of how well the car was fixed.

Why You Need an Independent Appraisal

Filing a DV claim without an independent appraisal is like going to court without evidence. The insurance company has adjusters, algorithms, and attorneys. You need documentation that holds up.

At Collision Claims Advisors, our appraisals are:

Performed by IACP-certified appraisers with 25+ years of industry experience
Based on actual market data — comparable vehicle sales, dealer interviews, and condition analysis
Accepted by insurance companies and courts across Illinois
Backed by a full written report you can submit directly with your demand

Frequently Asked Questions

How long do I have to file a diminished value claim in Illinois?

You have 5 years from the date of the accident under Illinois’s statute of limitations for property damage claims. Don’t wait — evidence quality decreases over time, and it becomes harder to prove value loss the longer you delay.

Can I file a diminished value claim if I was partially at fault?

Illinois follows comparative negligence rules, which means your recovery may be reduced by your percentage of fault, but you can still file if the other driver shares responsibility.

How much does a diminished value appraisal cost?

A professional DV appraisal from Collision Claims Advisors is a fraction of what most claims recover. Think of it as an investment — the appraisal pays for itself many times over in most cases.

Will filing a DV claim affect my insurance rates?

No. A diminished value claim is filed against the other driver’s insurance, not yours. It’s a third-party property damage claim and has no impact on your premiums.

What if the insurance company denies my claim?

If the at-fault carrier denies your DV claim, you have options: file a complaint with the Illinois Department of Insurance, pursue the claim in small claims court, or escalate with legal representation. Having a certified appraisal strengthens your position at every stage.

Get Your Free Claim Review

Don’t let the insurance company decide what your vehicle is worth. If you’ve been in an accident in Illinois and the other driver was at fault, you likely have a valid diminished value claim. Learn more about your rights in Illinois, or take the first step now.

Start your diminished value claim or call Charlie directly at 480-535-5765 for a free claim review.