Illinois Car Sales Tax and Dealer Fees 2026: What You’ll Pay in Arlington Heights and Cook County

Last reviewed: November 2026

Tax and fees can add thousands of dollars to a purchase, and they are where most surprises happen at signing. This guide explains each line on an Illinois buyer's order in plain English, so you know what to expect before you shop.

Important: tax rules and fees change, and your exact amount depends on your address, the vehicle and the deal. Always confirm current figures with the Illinois Department of Revenue, the Illinois Secretary of State and the dealer's title clerk. The numbers in this article are for general education and are not a quote.

Illinois vehicle sales tax: how it works

When you buy from an Illinois dealer, the tax on the vehicle is made up of a state portion and local portions.

Live in Chicago or outside Cook County? Your total can be different. For example, the transit tax rate is lower in the collar counties, and some local governments have their own use taxes on vehicles titled to their residents. The dealer will calculate tax based on the transaction and your title address, so ask for the breakdown on your buyer's order.

The Illinois trade-in tax credit

Illinois is one of the states that gives you a sales tax break for trading in a vehicle. You pay tax only on the difference between the price of the vehicle you are buying and the value of the vehicle you trade in.

Illinois previously capped this credit at $10,000 of trade-in value, but that cap applied only to sales from 2020 through 2021. Under current law, according to Illinois Department of Revenue guidance, there is no dollar limit on the trade-in credit. Lawmakers have proposed changes in the past, so confirm the current rule when you buy.

This credit is one of the biggest reasons trading in can make more financial sense than selling privately. We explain it in detail in our complete guide to the Illinois trade-in sales tax credit and compare the options in trade-in vs selling privately.

A worked example (hypothetical)

Here is how the math works on a made-up purchase in suburban Cook County. This is an illustration only, not a quote for any vehicle.

In this example, the trade-in reduces the tax by $1,500. That tax savings is real money to compare against any higher price you might get by selling privately.

The dealer documentary fee ("doc fee")

Illinois dealers may charge a documentary fee for preparing and processing the paperwork on a sale. Illinois law caps this fee and adjusts the cap each year for inflation. For 2026, the maximum is $377.63, according to the Illinois Automobile Dealers Association. The cap started at $300 in 2020 and has risen each year since.

What to know:

• The doc fee must be disclosed. You should see it as a separate line on your buyer's order.
• Many dealers charge at or near the maximum.
• Some dealers include fees in an advertised price, and others add them at signing. Ask how the price you are looking at is calculated.

Title, registration and other state fees

When you buy a vehicle, it needs to be titled and registered with the Illinois Secretary of State. Commonly listed figures for standard passenger vehicles are:

• Title fee: $165
• Standard passenger registration (plates): $151 per year
• Electric vehicles: an additional annual fee applies to EV registrations
• Plate transfer: if you transfer plates from a vehicle you already own, a transfer fee applies instead of new plates

Some dealers also charge an electronic title and registration processing fee for filing your paperwork electronically with the state. Ask whether it applies and how much it is.

Fee amounts are set by the state and can change. Check the Illinois Secretary of State website for current fees. If you are doing the paperwork yourself after a private sale, our guide to transferring a car title in Illinois walks you through it.

Buying from a private seller instead

Private sales are taxed differently. Instead of the dealer sales tax, the buyer pays the Illinois Private Party Vehicle Use Tax when titling the vehicle, using Form RUT-50. That tax is set by a schedule based on the vehicle's purchase price and age, rather than a simple percentage. Private buyers also do not get the trade-in tax credit, because there is no trade-in. Check the current RUT-50 schedule on the Illinois Department of Revenue website before you budget for a private sale.

Buying from an Illinois dealer as an out-of-state resident

If you live outside Illinois, how tax is handled depends on your home state and whether you will title the vehicle there. In many cases you will pay tax to your home state when you register the vehicle, and the Illinois dealer will handle the Illinois side of the paperwork, typically including Form RUT-25. We cover the details in our guide to buying a used car out of state and Illinois tax, and our virtual car buying and nationwide shipping guide explains how remote purchases work.

What you may see on an Illinois buyer's order

Every dealer's paperwork looks a little different, but these are the lines you are most likely to see, and what each one means:

• Vehicle selling price: The agreed price of the vehicle.
• Dealer-installed equipment or accessories: Only if applicable. Ask what they are and whether they are already on the vehicle.
• Documentary fee: Paperwork processing fee, capped by Illinois law ($377.63 maximum for 2026).
• Electronic title and registration fee: If the dealer files electronically and charges for it.
• Trade-in allowance: The value given for your trade-in, which reduces the taxable amount.
• Trade-in payoff: The amount needed to pay off any loan on your trade-in.
• Sales tax: Calculated on the price minus the trade-in allowance.
• Title and registration fees: State fees passed through to the Secretary of State.
• Optional products: Service contracts, GAP coverage, protection packages and similar items. These are optional and should be clearly identified as such.
• Down payment and amount financed: What you are paying today and what you are borrowing, if financing.

Common myths about Illinois car taxes and fees

"You only pay tax on the down payment." No. Tax is based on the vehicle's selling price, minus any trade-in allowance, regardless of how much you put down or finance.

"Buying from a dealer in another county always saves tax." Not necessarily. Local taxes and use taxes can apply based on where the vehicle is titled. Do the math with the full picture before driving across county lines to save a fraction of a percent.

"Doc fees are negotiable government fees." The doc fee is a dealer fee, not a government fee. It is capped by Illinois law, and it must be disclosed. Title and registration fees are the government fees.

"Trade-in tax credits are capped at $10,000." That cap applied in 2020 and 2021 only. Under current Illinois Department of Revenue guidance, there is no dollar limit.

How to avoid surprises at signing

1. Ask for an itemized breakdown early, showing price, trade-in, tax, doc fee, title, registration and any other charges.
2. Confirm your title address, since local taxes depend on location.
3. Bring your trade-in details, including title or loan payoff information, so the trade credit is applied correctly. If you still owe money on it, read trading in a car with a loan balance in Illinois.
4. Separate optional products such as service contracts and protection plans from required taxes and fees, so you know what is optional.
5. Read everything before you sign. The signed purchase documents are what count, not estimates or online calculators.