Idaho Car Sales Tax Calculator

What you pay in tax when you buy a vehicle in Idaho, from the statute and the revenue department.

Verified September 21, 2026 · statute and revenue department cross-checked

Vehicle price (USD) Trade-in value (USD)

Buying the car is only half the cost. You still owe an annual registration fee.

What to know about Idaho

A flat 6 percent with essentially no local sales tax. Trade-in credit works only when you buy from a dealer and trade at the same time. Manufacturer rebates paid to the seller do not reduce the taxable price in Idaho, which differs from how Idaho treats most other rebates.

Sources

Statute: Idaho Code § 63-3619

Idaho State Tax Commission, Motor Vehicles
“Trade-ins only apply when you buy a motor vehicle from a retailer (or dealer). ... Buying from individuals: The county assessor (DMV) or the Idaho Transportation Department (ITD) will collect sales tax when you apply for an Idaho title.”

Idaho State Tax Commission EPB00060, Vehicle Transactions
“If the buyer doesn’t have a receipt or bill of sale, collect sales tax on the NADA average trade-in price.”

Last verified: September 21, 2026.

Estimates only. Your dealer or the state issues the final bill, and exemptions can change what you owe. This page does not collect or store anything you enter.