Idaho Car Sales Tax Calculator Tax, title & license fees (2026)
Statewide sales/use tax (+ city local option tax where levied) · 6% state rate
Calculate Idaho car tax & fees
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How much is car sales tax in Idaho?
Idaho charges a flat 6% sales tax on vehicles. There's no county sales tax, though a few cities add a local option tax. How the 6% is applied depends on whether you buy from a dealer or from a private seller.
From a dealer, the taxable amount is the price minus your trade-in, plus the dealer's documentary fee. From a private seller, you pay 6% on the full purchase price with no trade-in credit. The county assessor or the transportation department collects it when you title the car.
Registration depends on the vehicle's age: $69 for a car one or two years old, $57 for three to six years, and $45 for seven years or older, plus a $1.25 emergency medical services fee. Battery-electric vehicles add $140 a year and plug-in hybrids $75. Regular hybrids pay nothing extra.
The state title fee is $14, and your county adds an administrative fee. Filing for a title more than 30 days after the sale costs a $20 penalty.
- Dealer: taxable = price - trade-in + doc fee
- Private: taxable = purchase price (no trade-in credit)
- Tax = taxable x 6% (+ local option tax)
- Title = $14 + county admin fee
- Registration = age-based fee + county admin + EMS fee + EV/PHEV fee
- Total = tax + title + registration + doc fee
Idaho car tax example with real numbers
Dealer purchase with a trade-in
You buy a new truck for $27,000, trade in your old one for $5,000 and pay a $399 doc fee. Your city has no local option tax.
- Taxable amount: $27,000 − $5,000 + $399 = $22,399.
- Sales tax: $22,399 × 6% = $1,343.94.
- Title, first-year registration and the EMS fee add $84.25.
- Estimated total: $1,428.19, plus your county's title and registration admin fees.
| Taxes | |
|---|---|
| Sales tax6% of $22,399.00 | $1,343.94 |
| Title & registration | |
| Title (state) | $14 |
| Registration | $69 |
| EMS fee | $1.25 |
| Estimated total | $1,428.19 |
Computed with the calculator on this page using the figures in our data. Local add-ons not mentioned in the example are left out.
Exceptions that change your Idaho tax bill
Family transfers and gifts
Transfers between family members (form ST-133) and genuine gifts (form ST-133GT) owe no sales tax.
Taking over payments
Assuming someone's loan payments counts as a purchase, not a gift, and is taxable.
Inheritance
A vehicle received through an estate owes no sales tax.
New residents and military
New residents who owned the vehicle for at least 90 days before moving owe nothing. Under 90 days, tax paid in another state is credited. Military members who owned the vehicle before receiving orders are exempt.
Idaho vehicle sales tax rates
| State rate | 6% |
|---|---|
| Local rate | City local option tax in some resort cities; varies |
Idaho title & registration fees
| Title state | $14 |
|---|---|
| Title county admin | Varies by county |
| Registration by vehicle age |
|
| Registration county admin | Varies by county |
| EMS | $1.25 |
| Battery EV fee | $140 |
| Plug-in hybrid fee | $75 |
| Late title penalty | $20 |
Idaho car tax exemptions & special cases
| Family transfer (Form ST-133) | Tax $0 |
|---|---|
| Gift (Form ST-133GT) | Tax $0 |
| Inheritance | Tax $0 |
| Assuming payments | Taxable; not a gift |
| Military, vehicle owned before orders | Tax $0 |
| New resident, owned 90+ days | Tax $0 |
| New resident, owned under 90 days | Tax minus tax paid elsewhere |
| Conventional hybrids | No EV fee |
Idaho car tax FAQ
Is the doc fee taxed in Idaho?
Yes. When a dealer charges a documentary fee, it's included in the 6% sales tax base.
Do private sales get a trade-in credit?
No. You pay 6% on the full purchase price.
Do hybrids pay the Idaho EV fee?
No. The $140 fee applies to battery-electric vehicles and the $75 fee to plug-in hybrids. Conventional hybrids pay nothing extra.
How much is registration in Idaho?
$69, $57 or $45 depending on the vehicle's age, plus a $1.25 EMS fee and county admin fees.
Sources & verification
We checked these figures against the following official pages on October 7, 2026:
- itd.idaho.gov/dmv/registrations-plates-titles/vehicle-registrations/
- itd.idaho.gov/dmv/registrations-plates-titles/vehicle-titles/
- tax.idaho.gov/taxes/sales-use/transportation/motor-vehicles/nondealers/
What changed in our last review
- late title penalty 20 (>30 days)
Spotted something out of date? Tell us and we'll recheck it.