When a car accident claim drags on for months while an insurance company stalls, delays, and low-balls, Illinois law provides a powerful incentive for carriers to resolve cases sooner rather than later. Prejudgment interest on car accident settlements in Illinois — governed by 735 ILCS 5/2-1303.5 — begins accruing from the date a lawsuit is filed, at a rate of 6% per year. That means every week an insurer refuses to make a fair offer, the potential judgment against it keeps growing. For injury victims, understanding how this statute shapes settlement negotiations can be the difference between waiting years for fair compensation and resolving a claim much faster.
This article provides general legal information; consult a licensed Illinois attorney for advice specific to your situation.
Why the Filing Date Is the Critical Moment
Before the prejudgment interest statute was enacted through P.A. 102-6, insurance companies had little reason to rush settlement talks. A carrier could drag out negotiations, force a plaintiff to file suit, take years to litigate, and lose nothing for the delay — a judgment entered three years after an accident still reflected roughly what the case was worth the day after the crash. The clock has since changed.
Under the current law, once a plaintiff files their complaint, prejudgment interest begins accruing at 6% annually on the eventual judgment amount. If the jury returns a verdict of $400,000 two years after the complaint was filed, the carrier owes not only that $400,000 but also an additional $48,000 in prejudgment interest. In a serious injury case with high damages, the interest alone can reach tens of thousands of dollars — all of which could have been avoided with an earlier, reasonable settlement offer.
The Settlement-Offer Offset: How Carriers Try to Use the Law Against You
The prejudgment interest statute includes a significant offset provision. If a defendant makes a written settlement offer before trial that the plaintiff rejects, and the plaintiff ultimately receives a judgment that is less than or equal to that offer, the prejudgment interest may be offset — meaning the defendant gets credit for having made a reasonable offer. This provision is designed to prevent plaintiffs from sitting on genuine settlement offers just to accumulate interest.
In practice, this means insurance adjusters may use formal written offers as a litigation tactic, making an offer that appears close to a fair number in hopes of cutting off interest exposure. Whether an offer is genuinely reasonable depends on the full facts of the case — medical bills, lost wages, future care needs, and pain and suffering. A number that looks large in isolation may still undervalue a serious injury claim. This is one reason the offer-offset mechanism makes it critical to have an attorney evaluate any written settlement offer before responding.
How Prejudgment Interest Changes Carrier Behavior
Before this statute, delay was effectively free for insurers. Adjusters could run out the clock, hoping injured claimants would accept low offers out of financial desperation or exhaustion. The 6% accrual rate changes that calculus in meaningful ways. A carrier that estimates a case is worth $300,000 knows that waiting 18 months to settle costs it an extra $27,000 in interest — on top of mounting defense attorney fees. For larger cases, the combined pressure of accruing interest and ongoing litigation costs makes early, fair settlement significantly more attractive.
Adjusters and defense counsel are now acutely aware of the running interest tally. This awareness can accelerate movement on cases that previously would have lingered in the litigation queue. Cases where liability is clear and damages are well-documented tend to see the most pronounced effect, since the carrier has the least to gain by prolonging the dispute.
The Connection Between Prejudgment Interest and Insurance Claim Strategy
Prejudgment interest is most relevant once litigation has begun, but its effects ripple backward into pre-suit negotiations. A carrier that knows a plaintiff’s attorney will file promptly if settlement talks fail has reason to negotiate more seriously before suit is even filed. Conversely, plaintiffs who signal they are reluctant to file — or attorneys who delay filing — remove one of the statute’s most potent pressures. Timely filing, backed by thorough documentation of damages, positions an injury victim to use the interest clock as genuine leverage.
For a broader overview of how Illinois law regulates what insurers can and cannot do during the claims process, our resource on insurance claims after a car accident covers the key obligations carriers have under Illinois law from the moment a claim is reported.
What This Means for Your Case Timeline
If you have been injured in a Chicago-area car accident and your claim is being delayed or undervalued, the timing of when your attorney files suit carries real financial consequences. Every month that passes after filing adds to the interest that a defendant will ultimately owe if the case goes to verdict or is settled after suit is pending. Equally, if you receive a formal written settlement offer, responding to it with full awareness of the offset rule is essential — accepting a below-value offer forfeits not just interest but also the full compensation you may be owed.
Illinois’s prejudgment interest law is relatively new, and its effects on real-world settlement negotiations are still developing through case law. Working with an attorney who actively tracks these developments — and who understands how to use the filing date and interest clock as strategic tools — matters more than it did before this statute took effect.
Talk to a Chicago Attorney — Free Consultation
If you or a family member has been injured in a car accident and an insurance company is stalling your claim, the attorneys at Phillips Law Offices are here to help. Call (312) 346-4262 or contact us online for a free, no-obligation consultation.
