Car sales tax in Chicago, Illinois
Buying a car in Chicago, Illinois (Cook County), the combined state and local sales tax rate is 9.75% for a buyer who lives there. On a $35,000 car that's about $3,449.32 in tax; with a $10,000 trade-in, about $2,474.32.
These are the figures the Before the Lot planner and its AI connector use for Chicago, with their sources. They describe the rates and the arithmetic; they are not tax advice, and the dealer's quote and the state's documents are what count.
How the rate is made up
Chicago, Cook County: 7.5% combined state and local rate (Illinois's rate file, rates as of 2026-08-01). Illinois's local tax goes by the dealer's location, so this is the rate where the dealer is.
Parts of Chicago are in other counties: DuPage County 7.25%.
Out-the-door examples in Chicago
Worked with the planner's own out-the-door math for a new car, the same numbers the connector gives an AI assistant.
| Line | $35,000 car, $10,000 trade-in | $50,000 car, no trade-in |
|---|---|---|
| Vehicle price | $35,000 | $50,000 |
| Doc fee (see below) | $377.63 | $377.63 |
| Sales tax at 9.75% | $3,449.32 | $4,911.82 |
| Title and registration (a placeholder) | $250 | $250 |
| Out the door, as dealers quote it | $39,076.95 | $55,539.45 |
| Tax saved by the trade-in credit | $975 | — |
| Out the door after the trade-in credit | $38,101.95 | — |
The trade-in's value itself comes off what's financed or paid, not shown here. Title and registration differ by vehicle; $250 is the planner's placeholder, not an Illinois figure. Illinois: the dealer's 7.5% plus 1.25% Chicago Home Rule Use Tax and 1% Cook County's use tax for the buyer's address gives 9.75%.
Doc fee and trade-in in Illinois
- The examples use Illinois's doc-fee cap, $377.63 (815 ILCS 375/11.1); a dealer's own fee may be lower.
- A trade-in lowers the taxed price in Illinois: tax is on the price less the trade-in.
- A maker's rebate doesn't lower the taxed price.
Every rule for the state, with sources: Illinois car-buying rules.
Other places in Illinois
- Aurora: 7.25%
- Naperville: 7.25%
- Joliet: 7.25%
- Elgin: 7.25%
- Waukegan: 7.25%
Work out your own deal
Open the planner with Chicago filled in
Change the price, trade-in and fees to your own. Nothing is sent to a server; the numbers ride in the link. In Claude or ChatGPT, add the connector and ask about Chicago by name.
Questions
What is the car sales tax rate in Chicago, Illinois?
Buying a car in Chicago, Illinois (Cook County), the combined state and local sales tax rate is 9.75% for a buyer who lives there. On a $35,000 car that's about $3,449.32 in tax; with a $10,000 trade-in, about $2,474.32.
What's the out-the-door price of a $50,000 car in Chicago?
About $55,539.45: the $50,000 price, a $377.63 doc fee, $4,911.82 in sales tax and a $250 placeholder for title and registration. A dealer's itemized quote is what counts.
Does a trade-in lower the sales tax in Chicago?
Yes. Illinois taxes the price less the trade-in, so a $10,000 trade-in on a $35,000 car lowers the tax by about $975.
Is the Chicago rate charged on the dealer's address or mine?
Illinois's local tax on a car goes by where the dealer is, not where the buyer lives. Illinois's own lookup by address: https://mytax.illinois.gov/?Link=TaxRateFinder