Idaho Car Sales Tax Calculator
Idaho charges 6% idaho sales and use tax on a used car purchase, verified September 15, 2026. A trade-in is deducted before tax. Private-party sales are taxed too, paid when you title the car.
Figures verified September 15, 2026; sources linked per row. Re-checked quarterly, next due December 15, 2026.
Taxable amount: $25,000. Tax only; dealer doc fees, title and registration are separate, and some states tax the doc fee as part of the price. The local figure is an estimate from the state's published range unless you entered your own rate.
The Idaho numbers, with sources
Each figure below was checked on September 15, 2026 against the page linked in the source column, and the wording the state uses is quoted so you can confirm it yourself.
| Item | Idaho | Source |
|---|---|---|
| State rate (Idaho sales and use tax) | 6% | tax.idaho.gov(state source)As published: “She doesn't owe Idaho tax because the amount paid Washington exceeds the amount she'd owe Idaho (6%, or $1,200).” |
| Local tax range | Not verified | tax.idaho.gov(state source)As published: “She doesn't owe Idaho tax because the amount paid Washington exceeds the amount she'd owe Idaho (6%, or $1,200).” |
| Trade-in credit | Yes, full credit | tax.idaho.gov(state source)As published: “You can accept merchandise as full or partial payment of a motor vehicle you sell. The amount allowed on the traded-in merchandise reduces the sales price.” |
| Dealer doc fee | No cap (typically $388) | itd.idaho.gov(state source)As published: “Any documentation fees charged must be clearly listed separately from other fees and identified to the customer as dealer document preparation fees that are subject to sales tax as part of the purchase price of the vehicle.” |
| Title fee | $14 to $32.75 | itd.idaho.gov(state source)As published: “The base title fee includes $14 plus county administrative fees, which vary by county ... County administrative fees range from $0.00 to $18.75” |
| Registration (by age) | $45 to $69 | itd.idaho.gov(state source)As published: “Passenger Vehicle (1 or 2 years old) $69.00 ... Passenger Vehicle (7 or more years old) $45.00” |
| Private-party sale taxed | Yes, paid when you title the car | tax.idaho.gov(state source)As published: “The county assessor (DMV) or the Idaho Transportation Department (ITD) will collect sales tax when you apply for an Idaho title.” |
- Local tax: Idaho lets resort cities and auditorium districts levy local option sales taxes; whether those reach titled motor vehicles could not be verified (legislature.idaho.gov refused the connection and Justia returned 403). The Tax Commission's DMV vehicle guide computes vehicle tax at the 6% state rate only.
- Trade-in: Dealer and retailer sales only; the guide states 'Trade-ins aren't allowed for private-party sales.'
- Doc fee: No cap. IDAPA 39.02.03.100.02.c only requires documentation fees to be listed separately and identified as dealer document preparation fees that are subject to sales tax. CarEdge's report of 93,200 verified quotes (July 2025 to September 2026) puts the average doc fee in Idaho at $388.
- Registration: Passenger vehicles: $69 at 1 or 2 years old, $57 at 3 to 6 years old, $45 at 7 or more years old; counties add administrative fees on top.
Next steps
- Out-the-door price calculator: adds the Idaho doc fee, title and registration to the tax for the full figure.
- Dealer doc fees by state and registration and title fees by state: see how Idaho compares.
- All states: the full sales tax table.
Tax is fixed. The price is not.
CarWorthIt prices a specific VIN at its mileage against cars actually for sale near your ZIP code from $2.99. The $9.99 Negotiation Bundle adds an opening offer and a walk-away figure, so the number Idaho taxes is the right one.
Idaho car tax questions
Does Idaho charge sales tax on a private-party car sale?
Yes. The buyer pays 6% use tax on the full price to the county assessor's DMV office or ITD when applying for the Idaho title; no trade-in allowance is given. Tax is on the bill-of-sale price; with no bill of sale, or one that looks low, the DMV taxes the NADA 'average trade-in price' for the same make, model, year, mileage and condition.
Does Idaho give a trade-in credit on car sales tax?
Yes. The value of your trade-in is deducted from the price before Idaho tax is calculated. Dealer and retailer sales only; the guide states 'Trade-ins aren't allowed for private-party sales.'
What is the dealer doc fee cap in Idaho?
Idaho sets no legal cap on dealer doc fees. Dealers typically charge $388. No cap. IDAPA 39.02.03.100.02.c only requires documentation fees to be listed separately and identified as dealer document preparation fees that are subject to sales tax. CarEdge's report of 93,200 verified quotes (July 2025 to September 2026) puts the average doc fee in Idaho at $388. If the dealer will not drop the fee, ask for the same amount off the price.
Do local sales taxes apply to car purchases in Idaho?
We could not verify the local tax rule against a Idaho state page on September 15, 2026. Check the state DMV or revenue department before you sign.
How much does a car title cost in Idaho?
$14 to $32.75 (flat). State title fee is $14; since July 1, 2023 each county may add its own title administrative fee (ITD notice https://itd.idaho.gov/wp-content/uploads/2023/06/DMV_title-fee.pdf: 'This is in addition to the current $14 title fee.'). amountMax is $14 plus the highest county fee listed ($18.75); Ada County's fee is $7, giving $21.
How much is annual car registration in Idaho?
$45 to $69 a year for a passenger car, by age. Passenger vehicles: $69 at 1 or 2 years old, $57 at 3 to 6 years old, $45 at 7 or more years old; counties add administrative fees on top.
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