Idaho car sales tax calculator

How does Idaho tax a car purchase?

Idaho taxes a car under its ordinary sales tax: 6% of the sales price. There is no separate vehicle tax. When a car is bought from a private seller or out of state, the matching use tax applies instead. A dealer collects the tax at signing and shows it on the title application, which is the proof you paid. The price taxed includes the destination charge, options, dealer add-ons and the doc fee. A trade-in allowance, a dealer discount and a maker’s rebate used at the sale come off it. Title and registration fees are not taxed when they are separately stated on the invoice.

legislature.idaho.gov · checked Oct 3, 2026

files.dfm.idaho.gov · checked Oct 3, 2026

legislature.idaho.gov · checked Oct 3, 2026

tax.idaho.gov · checked Oct 3, 2026

Is the Idaho dealer doc fee capped?

No. We found no dollar limit in Idaho law, and no presumed-reasonable amount either. The Transportation Department’s dealer rule asks for disclosure only: any documentation fee must be listed separately from other fees and identified to the buyer as a dealer document preparation fee that is subject to sales tax as part of the price of the vehicle. So the doc fee is taxed like the car. The same rule says the title fee must be shown as “TITLE FEE” at the exact amount the law requires, so it cannot carry anything extra. We found no Idaho rule that requires the same doc fee for cash and financed buyers; that point is not confirmed.

files.dfm.idaho.gov · checked Oct 3, 2026

tax.idaho.gov · checked Oct 3, 2026

Do trade-ins and rebates lower Idaho sales tax?

Yes. A trade-in allowance comes off the price before tax at its full value, with no dollar limit. It counts when the dealer takes the trade into its resale stock, both cars are on the sales papers, it is one transaction and you own the trade. If the trade is worth more than the car you buy, the taxable price falls to zero. If you still owe on the trade, the full allowance still comes off. The payoff rolled into the new loan is not taxed and does not shrink the credit. A maker’s rebate lowers the tax when it is used at the sale as a down payment or a price cut, and the invoice must show it that way. A rebate you take later as a check does not. A dealer discount lowers the tax too. A “dealer rebate” that the maker pays the dealer back for is not a dealer discount and stays taxed.

legislature.idaho.gov · checked Oct 3, 2026

files.dfm.idaho.gov · checked Oct 3, 2026

What do title and registration cost in Idaho?

The state title fee is $14, plus the county’s title administration fee. Ada County’s is $7.00, so a title there is $21.00 in all. Registration is a flat yearly fee by the car’s age, not its weight or value: $69 for a car 1 or 2 years old, $57 for 3 to 6 years and $45 for 7 or more. Each year adds a $1.25 emergency medical services fee, a $3.00 Project CHOICE fee and the county’s registration administration fee, which is $9.50 in Ada County. Ada County also adds its highway district’s fee: $40, $36 or $24 a year by the car’s age. Ada County votes on November 3, 2026 on extending it to 2046 at the same rates; nothing changes before 2029 either way. A new pair of standard plates is $11.80 as the Transportation Department charges it. The law explains only $3.75 a plate, so where the rest comes from is not confirmed. You may register for two years at double the yearly fees, except the county’s administration fee.

legislature.idaho.gov · checked Oct 3, 2026

legislature.idaho.gov · checked Oct 3, 2026

legislature.idaho.gov · checked Oct 3, 2026

legislature.idaho.gov · checked Oct 3, 2026

itd.idaho.gov · checked Oct 3, 2026

achdidaho.org · checked Oct 3, 2026

legislature.idaho.gov · checked Oct 3, 2026

I bought a car out of state or from a private seller. What do I pay in Idaho?

An Idaho resident who buys from an out-of-state dealer pays Idaho’s 6% use tax to the county assessor when titling, less credit for sales tax paid to the other state. If that was less, you pay the difference. No credit is given where the other state has no general sales tax, such as Alaska, Montana or Oregon. No title or registration is issued until the tax is paid, and an out-of-state title needs a $5 VIN inspection. A private sale pays the same 6% to the county assessor at titling, on the price on the bill of sale, with no trade-in credit. Without a bill of sale, the tax is on the average-condition trade-in value in the J.D. Power used car guide. A sale between close family members is exempt unless the seller never paid tax on the car. Title within 30 days, or a $20 late penalty applies.

legislature.idaho.gov · checked Oct 3, 2026

files.dfm.idaho.gov · checked Oct 3, 2026

Is there a local car sales tax in Idaho?

Not in Boise or Ada County. Resort cities of 10,000 people or fewer may adopt their own local sales tax by a 60% vote, and the Tax Commission lists 23 of them, among them Ketchum, McCall, Sandpoint and Sun Valley. Some limit their tax to lodging, alcohol by the drink and restaurant food, and the list gives no rates. Whether a resort-city tax follows the dealer or the buyer, and which cities tax cars, is not confirmed, so this calculator does not include those taxes. There is no yearly property tax on a car in Idaho: the registration fee is in place of it. Ada County’s emissions testing ended on July 1, 2023.

legislature.idaho.gov · checked Oct 3, 2026

tax.idaho.gov · checked Oct 3, 2026

legislature.idaho.gov · checked Oct 3, 2026

deq.idaho.gov · checked Oct 3, 2026