Illinois Out-the-Door Price Calculator
Use this Illinois out the door price calculator to estimate a supported dealer or private-party purchase total, then view trade equity, cash down, and Estimated Amount Remaining separately.
Last verified: October 2026Your Illinois OTD estimate will appear here.
Direct answer
What an Illinois Out-the-Door Price Includes
Out-the-Door Price is the supported total required to purchase the vehicle before subtracting trade equity or cash down. It combines the vehicle and taxable seller subtotal, optional products entered by the buyer, Illinois vehicle tax, title, and the selected registration or plate-transfer path.
The advertised vehicle price is only the starting point. Comparing written quotes by OTD price makes dealer charges and government costs easier to see.
Two purchase systems
Dealer Purchase vs. Private-Party Purchase
A supported Illinois dealer purchase uses the existing ST-556 engine and the vehicle-specific Auto Rate for the dealer's registered standard business location. Chicago, NITA, and Metro-East adjustments are applied when the verified location rules require them.
An ordinary private-party purchase uses the separate 2026 RUT-50 fixed tax tables. It does not use the dealer's Auto Rate, and it receives no dealer trade-in deduction. Chicago and Cook County RUT-6 amounts can apply based on the title or registration address.
For a tax-only comparison, use the Illinois Car Sales Tax Calculator.
Trade-in treatment
Qualifying Trade Value Is Different From Trade Equity
Trade value can reduce dealer vehicle tax
For a supported dealer transaction, the full qualifying trade-in value reduces the ST-556 taxable amount. The loan payoff does not reduce that tax credit.
Trade equity changes the amount remaining
Net trade equity equals trade value minus payoff. Positive equity lowers Estimated Amount Remaining. Negative equity raises it because the payoff is larger than the trade value. Neither result changes the Out-the-Door Price.
Separate planning totals
Out-the-Door Price vs. Estimated Amount Remaining
Out-the-Door Price is calculated before trade equity and cash down. Estimated Amount Remaining equals OTD minus net trade equity minus cash down.
Cash down affects only the second figure. Estimated Amount Remaining is a purchase-planning total, not a lender calculation; it does not include APR, loan term, interest, or lender-specific products.
Illinois government charges
Title, Registration, Plate Transfer, and BEV Costs
The supported original Illinois title fee is $165. A new ordinary passenger registration adds $151, while an eligible Illinois plate transfer uses the $25 transfer path instead. The calculator does not add both paths together.
A battery-electric vehicle adds $100 to a new passenger registration, producing a $251 registration total. That BEV addition is not charged on the eligible plate-transfer path by the existing verified engine.
Dealer-controlled fee
Illinois Documentary Service Fee Treatment
A documentary service fee entered in the dealer path is part of the supported ST-556 taxable selling price. It is dealer-controlled rather than an official government charge.
Use the Illinois Dealer Fee Checker to compare the charge with the documented 2026 figure used by this project and review other quote items.
Engine-backed example
Complete Illinois OTD Example
This Springfield dealer example uses a $30,000 battery-electric vehicle, $2,100 in taxable accessories, freight, and preparation, a $377.63 documentary fee, a $1,000 seller-funded discount, a $10,000 trade with a $12,000 payoff, $1,200 in optional products, and $2,500 cash down.
$30,000 Springfield dealer purchase
- Vehicle and taxable seller subtotal
- $31,477.63
- Taxable amount after qualifying trade
- $21,478.00
- Estimated Illinois vehicle tax
- $1,342.38
- Original title
- $165.00
- Passenger registration + BEV addition
- $251.00
- Optional products
- $1,200.00
- Out-the-Door Price
- $34,436.01
Trade value: $10,000.00 · payoff: $12,000.00 · net trade equity: -$2,000.00 · cash down: $2,500.00.
Estimated Amount Remaining: $33,936.01. Negative $2,000 trade equity increases this planning figure without changing OTD.
Illinois OTD questions
Frequently asked questions
What does out-the-door price mean in Illinois?
It is the supported total purchase price before subtracting trade equity or cash down, including the vehicle and seller subtotal, entered optional products, vehicle tax, title, and the selected registration path.
Does an Illinois trade-in reduce vehicle tax?
A qualifying trade accepted in a supported dealer transaction reduces the ST-556 taxable amount. An ordinary private-party purchase receives no dealer trade-in deduction.
Does a trade payoff change the Illinois tax credit?
No. The payoff changes net trade equity, while the qualifying dealer trade value controls the supported tax deduction.
Does cash down reduce the Out-the-Door Price?
No. Cash down reduces Estimated Amount Remaining after OTD is calculated.
Is an Illinois documentary service fee taxable?
Yes. The existing ST-556 engine includes an entered documentary service fee in the taxable dealer selling price.
Does the OTD calculator include the Illinois EV registration charge?
Yes. A supported battery-electric vehicle with new passenger registration receives the additional $100 charge. The eligible plate-transfer path does not also add full registration.