State lemon law · checked October 23, 2026
Verified against the statute / official state publication815 ILCS 380 (New Vehicle Buyer Protection Act)
| Presumption window | The tightest window in the dataset: 12 months / 12,000 miles. |
|---|---|
| Same defect | 4+ repair attempts |
| Days out of service | 30+ business days — 30 or more BUSINESS days out of service — Illinois counts business days, not calendar days. |
The presumption is the set of numbers that shifts the burden to the manufacturer. A claim can exist outside the presumption — it is a shortcut, not the whole road. Read why.
Illinois publishes no formula. The deduction is a 'reasonable allowance' for use before the first report of the defect — negotiated or decided case by case. Any calculator that gives you an exact Illinois number invented it. Refund includes collateral charges; taxes are excluded.
Prior direct written notice to the manufacturer and an opportunity to cure are elements of the Illinois presumption (§3(h)).
Dispute route: No mandatory state program; a Part 703 program, if the manufacturer maintains one and notifies you, may have to be used first.
Attorney's fees: Illinois provides attorney's fees to a prevailing consumer.
Illinois prints no separate lemon-law filing date in the Act; the 12-month / 12,000-mile presumption window is the operative clock.
| New vehicles | Covered |
|---|---|
| Leased vehicles | Covered |
| Used vehicles | Not covered |
| Motorcycles | Covered |
| RV / motor home | Covered — whole vehicle |
Your repair-log tracker, the Illinois notice letter, the buyback worksheet on Illinois's formula, and your deadline calendar.
Checked October 23, 2026. Laws change; if your claim is close to a line, verify the current statute or ask a lawyer in Illinois. This page is information, not legal advice.