Wisconsin car sales tax is 5% at the state level, plus a county tax of 0.5% in most counties and 0.9% in Milwaukee County, giving a combined rate of 5.5% for most buyers and 5.9% in Milwaukee.1Wisconsin Department of Revenue. DOR County and City Sales and Use Taxes The tax applies to vehicles bought from a dealer and from a private seller, and it’s calculated on the purchase price after any qualifying trade-in.
What the Tax Is Calculated On
The taxable amount is the full price you pay for the vehicle. Trade in a car as part of the same transaction and the trade-in value reduces that amount.2Wisconsin Department of Transportation. eMV Public FAQs – Purchase Price Information On a $30,000 car with a $10,000 trade-in, you owe tax on $20,000. At 5.5%, that saves $550.
The credit only works when the sale and the trade-in happen in a single transaction. If you sell your old car on your own and put the money toward a new purchase, that’s not a trade-in and your taxable amount doesn’t drop.3Wisconsin State Legislature. Wisconsin Administrative Code Tax 11.83 – Motor Vehicles At a dealership this is automatic; between two private parties it requires documentation showing both vehicles’ values on one bill of sale.
Which County Rate Applies to You
The county portion is set by where you keep the vehicle, not where you bought it. Buy in a no-tax county and garage the car in one with the 0.5% local rate and you owe the combined amount. Milwaukee County’s local rate rose to 0.9% on January 1, 2024. Manitowoc County began collecting its 0.5% tax on January 1, 2025, and Racine County followed on April 1, 2025.1Wisconsin Department of Revenue. DOR County and City Sales and Use Taxes
Buying a Car Out of State
Buying across state lines doesn’t let you avoid Wisconsin tax. When you register the vehicle here, you owe use tax at the 5% state rate plus any applicable county tax. Wisconsin gives you a dollar-for-dollar credit for sales or use tax you already paid to another state. Pay 6.25% in Illinois and you’ve already covered what Wisconsin would charge, so nothing more is due at registration. Pay less than the Wisconsin rate and you owe the difference.4Wisconsin State Legislature. Wisconsin Administrative Code Tax 11.83 – Motor Vehicles
The credit only covers state or territorial taxes. Taxes paid to another country don’t count, and neither do registration fees paid elsewhere.
One rule helps people moving to the state: if you bought the vehicle out of state at least 90 days before becoming a Wisconsin resident, you owe no use tax on it.4Wisconsin State Legislature. Wisconsin Administrative Code Tax 11.83 – Motor Vehicles
When You Don’t Owe Sales Tax
Transfers between certain relatives are exempt when the vehicle is already titled in Wisconsin under the transferor’s name and the transferor isn’t in the business of selling cars.5Wisconsin Department of Revenue. Sales and Use Tax Information for Motor Vehicle Sales The qualifying relationships are:
- Spouses
- Parents and children, including sons-in-law, daughters-in-law, fathers-in-law, and mothers-in-law
- Stepparents and stepchildren
Siblings, grandparents, and domestic partners are not covered.6Wisconsin Department of Transportation. eMV Public Glossary
A nonresident who buys a vehicle in Wisconsin owes no state, county, or city sales tax as long as the vehicle isn’t used in Wisconsin beyond driving it out.7Wisconsin Department of Revenue. Sales and Use Tax on Sales of Used Motor Vehicles, Boats, Snowmobiles, RVs, Trailers, Semitrailers, ATVs, UTVs, Off-Highway Motorcycles, and Aircraft
Farm buyers should know a boundary. Wisconsin exempts tractors, machinery, and equipment used exclusively and directly in farming, but the exemption specifically excludes automobiles, trucks, and other motor vehicles registered for highway use.8Wisconsin State Legislature. Wisconsin Administrative Code Tax 11.12 – Farming, Agriculture, Horticulture and Floriculture A pickup for the farm with highway plates is taxable.
How and When You Pay
At a dealership, the dealer collects the sales tax at closing and remits it to the Department of Revenue.4Wisconsin State Legislature. Wisconsin Administrative Code Tax 11.83 – Motor Vehicles In a private sale, the seller doesn’t collect anything; you pay the tax when you apply for the title at the DMV.7Wisconsin Department of Revenue. Sales and Use Tax on Sales of Used Motor Vehicles, Boats, Snowmobiles, RVs, Trailers, Semitrailers, ATVs, UTVs, Off-Highway Motorcycles, and Aircraft
You’ll complete Form MV1, the Title and License Plate Application, which asks for the purchase price, any trade-in amount, any exemption claim, and the vehicle identification number. The online MV1 tool walks through the questions and estimates fees, which is faster and less error-prone than the PDF.9Wisconsin Department of Transportation. MV1 Online Application
Wisconsin law requires you to apply for a new title “immediately” after the vehicle is delivered. There’s no clean 30-day window. A late application can bring a forfeiture of up to $200, and if the delay is intentional and involves fraud, the penalty is a fine of up to $1,000, up to 30 days in jail, or both.10Wisconsin State Legislature. Wisconsin Code 342.15 – Transfer of Title Submit the paperwork within a few days of the sale.
Deducting the Tax on Your Federal Return
If you itemize on your federal return, the sales tax on a vehicle is deductible on Schedule A. You have to choose between deducting state and local income taxes or state and local sales taxes; you can’t take both.11Internal Revenue Service. Instructions for Schedule A (Form 1040) Because Wisconsin has a state income tax, most residents come out ahead claiming income taxes, but a big-ticket vehicle purchase in a low-income year can flip the math. Run both options before you file.