Car Sales Tax and Fees in Idaho

In Idaho, the average combined state and county sales tax on car purchases is 6.074%. Local sales tax may differ and result in different vehicle sales tax.
Written by Tiffany Leung
Reviewed by Jessica Barrett
All car sales in
are subject to a state sales tax rate of 6%. However, the total tax rate is dependent on your county and local taxes, which can be up to 9%. On average, the total Idaho car sales tax is 6.074%.
Although checking the sale price of the car you’re shopping for can help keep you within budget, there are additional costs that can push you over. One particular cost you should take note of is the sales tax, which can vary depending on where your car is purchased.
Idaho car sales tax rates are some of the highest in the country. You will need to find out the exact rate in your area to know how much your car will actually cost. Fortunately,
, can guide you through the car sales taxes in Idaho.
Make auto loan refinancing easy with PriceProtect™
icon4.7/5 rating on the App Store | Trusted by 5+ million customers and 7 million cars
icon4.7/5 app rating | Trusted by 5M+ drivers

How much is the car sales tax rate in Idaho?

The statewide sales tax in Idaho is 6%, which will be applied to any car purchase, whether it’s a new or used car. On top of this base tax, you will also need to shell out extra for your county or local sales tax
The highest combined sales tax rate for car purchases is in the city of Sun Valley, which has a 9% sales tax. Among the 112 local tax jurisdictions across the state, the sales tax averages out to around 6.074%. The good news is that multiple Idaho counties do not collect additional sales tax, so the rate in those particular counties is 6%.

How are car trade-ins taxed in Idaho? 

Many dealers will allow you to
trade in an old vehicle
so that you can use the credit towards purchasing a new car. In Idaho, the car sales tax only applies to the final ticket cost of your car, as the value of your trade-in is not subject to taxes. 
For example, if you’re buying an
Audi A4 Premium
worth $57,000 in
, and you’re trading in your old
Honda CR-V
for a $3,500 credit, you’ll only have to pay Ada County’s 6% combined state and local sales tax on $53,500 of the purchase. 
On the other hand, dealer rebates and incentives are not exempt from sales tax—meaning the sales tax is applied to the vehicle price before dealer incentives. For example, even if the dealer gives you a rebate, the sales tax will still be applied to the full price of the car. 

How to calculate sales tax on a car in Idaho

You can easily calculate the total car sales tax in your area by using the online tax calculator tool provided by the Sales Tax Handbook. You can get an estimate of the sales tax rate that will apply to your car purchase based on your purchase location ZIP code. 
Key Takeaway You can combine the 6% statewide sales tax with your local or county sales tax to calculate the total car sales tax in your area. 

Exemptions from Idaho car sales tax

Although all Idaho State car purchases are subject to sales tax, there are a few exemptions. You can fill out the following forms for a car sales tax exemption according to your situation: 
  • Non-resident buyers: Idaho Sales Tax Exemption Certificate–Nonresident Vehicle/Vessel Form ST-104NR
  • Government agencies, schools, some nonprofit organizations, and American Indian tribes: Idaho Resale or Exemption Certificate
    Form ST-101
  • Members of American Indian tribes: Sales Tax Exemption Certificate–Family or American Indian Sales
    Form ST-133
  • Interstate commerce: Idaho Sales Tax Exemption Certificate–Motor Vehicle
    Form ST-104IC
  • Producers, farmers, and ranchers: Idaho Resale or Exemption Certificate
    Form ST-101
For more details on available sales tax exemptions, refer to the
chart provided
by the Idaho State Tax Commission. 

How to estimate Idaho tax, title, and registration fees

Aside from the sales tax, you’ll also need to consider other factors that affect your total cost. For example, the title and
vehicle registration
fees, the cost to transfer your license plates, and the documentation fee charged by most dealerships. 
Here’s how all the additional costs associated with car purchases in Idaho break down:
Average cost
Sales tax
Registration fee
$45 to $69 <BR>(+$140 for electric vehicles) <BR>(+$75 for plug-in hybrids)
Title fee
Plate transfer
Documentation fee

How to find affordable car insurance in Idaho

One last expense after all the taxes and fees is the cost of
car insurance
for your new car! Although Idaho can have high insurance rates, the
app can help lower your cost. 
Jerry does all the hard work of finding affordable quotes from the over 50 name-brand insurance companies and buying new car insurance. To ensure you always have the lowest rate, Jerry will also send you new quotes every time your policy comes up for renewal, so you’re always getting the coverage you want at the best price. 
“When we added a new car to our family, we were shocked at how high our current insurer was going to hike our rates. We used
for some comparison shopping and are now saving around $1000 a year. Thank you, Jerry!” —Darius P.
Compare auto insurance policies
No spam or unwanted phone calls · No long forms
Find insurance savings


The sales tax for used and new cars in Idaho is the same—it’s the statewide base rate of 6% plus your local or county tax rate.
Reduce your monthly car payments in minutes?
Find out if Jerry can reduce your payments by an average of $150/month
Check your rate!

Easiest way to compare and buy car insurance

No long forms
No spam or unwanted phone calls
Quotes from top insurance companies
Find insurance savings