Chicago Used Car Tax 2026: Sales Tax, Title, and Registration Costs
Buying a used car in Chicago or Cook County means one of two very different tax bills depending on whether you buy from a dealer or a private seller. Here's both, with the actual state tables.
By Vitaliy Kuznetsov · Updated Sep 28, 2026 · 7 min read
"Sales tax on a used car in Chicago" sounds like one number. It isn't. Illinois taxes a dealer purchase and a private-party purchase under two completely different systems, and which one applies to you changes the bill by hundreds of dollars.
Buy from a dealer and you pay a percentage of the price, 10.5% in Chicago. Buy from a private seller and you pay a flat dollar amount from a state table instead, with no exceptions. Here's each system with the actual 2026 numbers, plus what title and registration add on top.
Dealer Purchases: Percentage Sales Tax
Buy from a licensed dealer and Illinois taxes the sale like any other retail purchase, as a percentage of the price under the Retailers' Occupation Tax Act. In Chicago, the combined rate is 10.5% as of August 2026, when a rate increase under the new Northern Illinois Transit Authority (NITA, formerly the RTA) took effect statewide across six counties:
| Component | Rate |
|---|---|
| Illinois state | 6.25% |
| Cook County | 1.75% |
| City of Chicago | 1.25% |
| NITA (transit tax, formerly RTA) | 1.25% |
| Total, City of Chicago | 10.5% |
Outside city limits, the rate is lower: Cook County suburbs drop the 1.25% Chicago component, and most also layer on their own local tax through "home rule" authority, a state-granted power that lets larger cities and counties add their own sales tax on top of the state's. The exact combined rate depends on the specific municipality, which is why the out-the-door price calculator asks for your address and looks up the real number instead of estimating one.
One rule catches people off guard: the tax is based on where the vehicle will be titled and registered, not where the dealer is located. Buy from a suburban dealer but register the car to a Chicago address, and you owe Chicago's 10.5%, not the suburb's lower rate. (This page covers vehicle purchases; leases are taxed under a different set of rules.)
A trade-in still works the normal way here: you're taxed on the price minus your trade-in value, not the full purchase price.
Private-Party Purchases: A Flat Tax Table, Not a Percentage
Buy from another person instead of a dealer, and Illinois switches you to an entirely different tax: the Private Party Vehicle Use Tax, filed on Form RUT-50 (opens in a new tab), the state's private-party vehicle tax return: a flat dollar amount from a state table rather than a percentage of the price, with no trade-in deduction allowed.
Figuring out what you owe takes three lookups: find your vehicle's row in the state table below, then find the same row in the Chicago and Cook County add-on table after it, and add all three numbers together.
For a vehicle worth under $15,000, the state tax is set by the model year:
| Vehicle age | State tax due |
|---|---|
| 1 year or newer | $465 |
| 2 years | $365 |
| 3 years | $290 |
| 4 years | $240 |
| 5 years | $190 |
| 6 years | $165 |
| 7 years | $155 |
| 8 years | $140 |
| 9 years | $125 |
| 10 years | $115 |
| 11 years or older | $100 |
For $15,000 or more, the state tax is set by purchase price instead of age, ranging from $850 (at $15,000–$19,999.99) up to $10,100 (at $1,000,000 or more). Motorcycles and ATVs pay a flat $25 regardless of age or price.
On top of that state amount, Chicago and Cook County each add their own local private-party tax, based on the same address used on your Illinois title or registration:
| Vehicle age | City of Chicago | Cook County |
|---|---|---|
| 3 years or newer | $80 | $225 |
| 4 to 8 years | $65 | $175 |
| 9 to 14 years | $50 | $90 |
| 15 years or older | $0 |
Register a private-party purchase to a Chicago address and you owe all three: the state table amount, the Chicago amount, and the Cook County amount, stacked together on Form RUT-50.
Worked Example: Same Car, Two Sellers
A 5-year-old car worth $12,000, registered to a Chicago address, taxed two different ways:
| Line item | Bought from a dealer | Bought from a private seller |
|---|---|---|
| Vehicle price | $12,000 | $12,000 |
| Tax | $1,260 (10.5%) | $430 ($190 state + $65 Chicago + $175 Cook) |
| Doc fee | Up to $377.63 | Not applicable |
The private-party route is cheaper here because the price is under $15,000 and the car is a few years old; the gap narrows or reverses on newer, pricier cars where the flat table climbs faster than a percentage would. Run your own numbers on the calculator before assuming either route is cheaper.
Title and Registration Fees
These are the same statewide regardless of where you buy or who you buy from: a $165 title fee and a $151 registration fee, both paid straight to the Illinois Secretary of State. Add the ERT fee if your dealer files electronically, and the doc fee if you're buying from a dealer.
Frequently Asked Questions
Is Chicago's sales tax on cars really 10.5%?
Yes, for a dealer purchase registered to a Chicago address, as of the NITA rate increase that took effect August 1, 2026. That applies only to dealer sales; private-party sales use the flat RUT-50 table instead.
Do I pay Chicago tax if I buy from a suburban dealer?
If you register the car to a Chicago address, yes. Illinois sources the tax to where the vehicle is titled and registered, not where the dealer's lot is.
Can I deduct a trade-in on a private-party purchase?
No. The private party vehicle use tax is a flat amount from the state table, and a trade-in deduction only applies to dealer purchases taxed under the percentage system.
Do title and registration fees change by county or city?
No. The $165 title fee and $151 registration fee are set statewide by the Secretary of State and don't vary by where you live.
Can I just write down a low price to lower my private-party tax?
No. If the price on your bill of sale looks materially below the vehicle's fair market value, the state can assess your RUT-50 tax on the vehicle's actual value instead of the stated price. This is a common trap for private-party deals priced as a favor to family or friends.
The Bottom Line on Chicago Used Car Tax
Dealer and private-party purchases run on two different tax systems in Illinois, and Chicago and Cook County both add their own amount on top of the state's. Know which system applies before you compare prices between a dealer and a private seller, since the sticker price alone doesn't tell you which one costs less.
Before you buy, run the numbers through the free out-the-door price calculator and check what documents to bring to the dealership.
Written by V (Vitaliy Kuznetsov)
I've sold cars, run a 3,000-person shopper community and led product at Cars.com. More about me or call or text 847-834-4468 and I'll help with your purchase.