Illinois car sales tax: rate, sourcing and what it applies to

How the Illinois rate is set

Illinois's rate is not a single statewide number — it is resolved from the ZIP code you register in, because local jurisdictions add to the state rate. Across Illinois the combined rate runs 6.25% to 8.5%, so where you register genuinely changes what you owe.

What sits inside the taxable amount

Taxed on top of the vehicle price: the dealer doc fee and dealer-installed accessories.
Not part of the taxable amount: extended warranties and service contracts.
Your trade-in comes off before tax is calculated.

What's specific to Illinois

Illinois gives you FULL trade-in credit with no cap — the $10,000 cap that existed in 2020–2021 expired on January 1, 2022, so your entire trade-in value reduces the taxable amount.
Manufacturer rebates are taxed in Illinois: when the dealer is reimbursed for the rebate, it's part of the taxable selling price, so tax is computed before the rebate is applied. A dealer discount, by contrast, does lower your taxable price.
The doc fee is capped at $377.63 for 2026 (CPI-indexed from a $300 base, 815 ILCS 375/11.1) and is part of the taxable selling price.

Run your own numbers

Vehicle price

$

The negotiated (or advertised) selling price, before fees and tax.

Your ZIP code

Tax and registration follow where YOU register — not the dealership.

Condition

New Used CPO

Fuel

EV/PHEV surcharges apply in many states.

More options — trade-in, rebates, doc fee, add-ons

Trade-in value

$

Reduces your taxable amount only in states that allow it.

Trade-in loan payoff

$

Display-only in the equity math — doesn't affect tax.

Manufacturer rebate

$

Taxed in some states, a tax-free discount in others.

Dealer discount

$

Off-invoice discount from the dealer — different from a rebate for tax.

Dealer doc fee (if quoted)

$

Leave blank to use your state's cap or the typical amount.

Dealer add-ons total

$

Nitrogen, VIN etch, protection packages… labeled negotiable in the output.

F&I products total (VSC, GAP…)

$

Excluded from tax in some states when itemized separately.

Model year

MSRP / vehicle value

$

Needed in states with value-based registration (AZ VLT, NV GST).

Financing the purchase I have a plate to transfer (matters in Florida — skips the $225 initial registration)

Truck / commercial (California weight fees)

Vehicle type

Pickups always use the unladen-weight schedule (VC §9400) — never CVRA.

Curb (unladen) weight, lbs

On the door-jamb sticker. Blank = typical half-ton bracket ($80).

Axles

Declared GVW/CGW, lbs

As declared on the REG 4008. CVRA vehicles skip the TIF.

Used vehicle details (California)

Plate expiration (month)

Expired or expiring within 120 days of purchase → renewal fees ride along with the deal. Blank = assume they're due (safe estimate).

No current California plates (out-of-state car — full first registration + smog test due)

My price already includes…

Some dealers now fold fees into the advertised price (FTC pressure; California's total-price law). Check what yours covers so nothing gets counted twice.

Doc fee Emissions / smog testing charge (used vehicles)

Common questions

What is the car sales tax rate in Illinois?

It varies by where you register — the state rate plus whatever your local jurisdiction adds. Enter your ZIP in the calculator for the exact combined rate.

Is the doc fee taxed in Illinois?

Yes. The doc fee is added to the price before tax is calculated, so it costs you slightly more than its face value.

Illinois car sales tax: rate, sourcing and what it applies to

How the Illinois rate is set

What sits inside the taxable amount

What's specific to Illinois

Run your own numbers

Common questions

What is the car sales tax rate in Illinois?

Is the doc fee taxed in Illinois?

More on buying a car in Illinois

Illinois: Doc fee rules

Illinois: Registration and title fees

Full Illinois out-the-door guide