Illinois car-buying rules
These are the rules the Before the Lot planner uses for Illinois, with the source and date for each. They describe the rules and the planner's estimate; they are not legal or tax advice, and the dealer's quote and your state's documents are what count.
Dealer doc fee in Illinois
Cap: $377.63 (dealer-financed sales).
- How the figure changes: yearly (CPI), each Jan 1.
- Law: 815 ILCS 375/11.1.
Base $300 from 2020, CPI-adjusted every year: $347.26 (2023), $358.03 (2024), $367.70 (2025), $377.63 (2026). The Attorney General announces the figure each December; the 2026 notice isn't online, and $377.63 is from the Illinois dealers' association (it matches the AG's method). The statute names retail installment contracts; the AG's ad rule and buyer guide treat a fee over the cap as illegal without a cash exception, so on a cash deal it's worth raising, not a sure violation. A 'not an official fee' notice is required.
Sales tax in Illinois
- Tax: Retailers' occupation (sales) tax.
- State rate used: 6.25%.
- Local add-ons: Up to 4.75% on top of the state rate.
- Dollar cap on the tax: none in the data.
Plus local tax by dealer location (higher in Cook County and Chicago). Full trade-in credit; the old $10k cap ended 2022.
Your local rate
Local tax on a car goes by the dealer's location. Find your exact rate: Illinois official lookup (MyTax Illinois Tax Rate Finder).
Trade-in tax credit
Yes. Illinois takes the trade-in value off the taxed price.
Does a maker's rebate lower the taxed price?
No. Worked example: $30k car with $1k assigned rebate has $30,000 receipts. Manufacturer-to-dealer incentives not passed on aren't receipts.
Cancellation and return rights
No Illinois-specific right to cancel or return a dealership purchase is in the planner's data.
There is no federal cooling-off period for buying a car at a dealership; the FTC's door-to-door Cooling-Off Rule excludes dealers with a permanent place of business (16 CFR 429.3(a)). The FTC CARS Rule was vacated by the Fifth Circuit in January 2025 and formally withdrawn effective Feb 12, 2026 (91 FR 6507). No other state with a general used-car cooling-off right was found; NCLC calls California's the first in the nation.
Worked out-the-door example: a $35,000 vehicle
Built with the planner's own out-the-door formula: the tax is the state base rate times the vehicle price plus the doc fee, with no trade-in, rounded to the cent. Local taxes are not included.
| Line | Amount |
|---|---|
| Vehicle price (example) | $35,000 |
| Doc fee (the Illinois cap) | $377.63 |
| Sales tax at 6.25% on $35,377.63 | $2,211.10 |
| Title and registration (the planner's default estimate) | $250 |
| Out-the-door total | $37,838.73 |
Title and registration fees differ by state and vehicle; $250 is a placeholder, not an Illinois figure.
Plan a purchase in Illinois
Plan a purchase in Illinois opens the free planner with Illinois already chosen. Nothing is sent to a server; the choice rides in the link's fragment.
These rules feed two steps of the method: set your numbers and let dealers compete. To read a dealer's quote line by line, see reading an out-the-door quote. All states.