Free car tax, lease, fuel and affordability calculators

Free Idaho Car Sales Tax Calculator

Work out the Idaho car sales tax on a new or used car. Idaho charges sales tax (6%). Your trade-in lowers the taxable price.

$
$
Sales tax (6%).
More options: rebate, dealer fees, state rules
$
$
Doc fees are taxable in many states. Leave at 0 if unsure.
Estimated tax
$1,800.00
Taxable amount$30,000.00
Tax$1,800.00
Total due (before title and registration)$31,800.00
Advertisements

Idaho car sales tax rules

  • Tax type: Sales tax (6%)
  • Rate used in the calculator: 6%
  • Local taxes: A few resort cities charge local option taxes; most buyers pay 6%.
  • Trade-in credit: Yes, on dealer sales only (the trade-in must go into the dealer’s inventory).
  • Manufacturer rebates: Not confirmed by the state source; the calculator taxes the price before the rebate, the more cautious choice.
  • Also note: A manufacturer rebate lowers the taxable price only if it is paid to the dealer and taken off the price. A down payment does not lower it.

Tax on common car prices in Idaho

PriceTaxTax with $5,000 trade-inPrice + tax
$10,000$600.00$300.00$10,600.00
$20,000$1,200.00$900.00$21,200.00
$30,000$1,800.00$1,500.00$31,800.00
$40,000$2,400.00$2,100.00$42,400.00
$50,000$3,000.00$2,700.00$53,000.00

At 6%.

Advertisements

Other costs when you buy a car

On top of the tax, expect title, registration and plate fees, and a dealer documentation fee. Check whether the car fits your budget with the car affordability calculator, or compare with a lease.

Frequently asked questions

How much is sales tax on a car in Idaho?

Idaho charges sales tax (6%). Your trade-in lowers the taxable price.

How much tax will I pay on a $30,000 car in Idaho?

About $1,800.00 at 6%, or $1,500.00 with a $5,000 trade-in. Title, registration and plate fees are extra.

Does a trade-in reduce car sales tax in Idaho?

Yes, on dealer sales only (the trade-in must go into the dealer’s inventory).

Do local taxes apply to cars in Idaho?

A few resort cities charge local option taxes; most buyers pay 6%.

Sources

Rules last reviewed 2026-11-11. Estimates only; the dealer or your state motor vehicle agency calculates the final amount.

Other states

Advertisements