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State Guide Last verified August 27, 2026

Idaho Car Sales Tax, Trade-In Credit, and Out-of-State Rules

What the desk and the buyer each need to know when a Idaho deal crosses state lines: the rate, the trade-in math, the exemption paperwork, and the drive-home tags. Every fact links to the official source.

Check an Out-of-State Deal Jump to Quick Facts

Every fact sourced to Idaho official publications below

Short answer

Idaho taxes vehicle sales at 6%. Idaho taxes the price after the trade-in is deducted. The dealer must put the trade-in into resale inventory, and the trade and all documentation must happen at the time of sale or the allowance does not reduce the sales price. Manufactured homes and modified park model recreational vehicles cannot be taken in trade. Idaho exempts out-of-state buyers only under specific conditions: The buyer must be a nonresident and the vehicle must be intended for use outside Idaho and not require Idaho titling. It must be taken out of Idaho and immediately registered and titled in another state or country, and cannot be used in Idaho more than 90 days in any consecutive 12 months. An Idaho resident named as co-buyer, co-borrower, co-applicant for title or registration, or a party on any sales document kills the exemption, as does an Idaho driver's license or Idaho address. Idaho credits sales tax legally paid to another state, so the same dollars are not taxed twice. The rules above cover retail dealer sales; most states handle leases and private-party sales separately.

Idaho car sales tax quick facts

Last verified August 27, 2026
Sales tax rate on vehicles6%[1]
Trade-in creditIdaho taxes the price after the trade-in is deducted. The dealer must put the trade-in into resale inventory, and the trade and all documentation must happen at the time of sale or the allowance does not reduce the sales price. Manufactured homes and modified park model recreational vehicles cannot be taken in trade.[2]
Selling to an out-of-state buyerIdaho exempts out-of-state buyers only under specific conditions: The buyer must be a nonresident and the vehicle must be intended for use outside Idaho and not require Idaho titling. It must be taken out of Idaho and immediately registered and titled in another state or country, and cannot be used in Idaho more than 90 days in any consecutive 12 months. An Idaho resident named as co-buyer, co-borrower, co-applicant for title or registration, or a party on any sales document kills the exemption, as does an Idaho driver's license or Idaho address.[3]
Credit for tax paid to another stateIdaho credits sales tax legally paid to another state, so the same dollars are not taxed twice.[4]
Dealer doc feeCap: Not yet verified against an official source. Confirm with the Idaho State Tax Commission. Official site → · taxable[2]
Temp tag for the drive homeIdaho dealers issue 30-day temporary registration permits, which ITD lists as being for out-of-state residents only. Dealers buy them from ITD in books of 20 (order form ITD 3763). (valid 30 days)[5]
Out-of-state buyer registrationIdaho registration is for Idaho residents and businesses. The vehicle has to belong to an Idaho resident or business, it must be titled in Idaho before it can be registered, and the registrant needs a verifiable physical address and mailing address.[6]
General information, not tax or legal advice. Rates and rules change. Before you write a check, confirm with the Idaho State Tax Commission or your accountant. Last verified August 27, 2026. Covers retail dealer sales; leases and private-party sales follow different rules in most states.

From the desk

Idaho keeps vehicle tax simple and statewide, which makes it a relief state for the desk. The work is on the borders: Washington and Oregon buyers cross for inventory, and each direction has its own paperwork.

Selling to an out-of-state buyer in Idaho

Idaho exempts out-of-state buyers only under specific conditions: The buyer must be a nonresident and the vehicle must be intended for use outside Idaho and not require Idaho titling. It must be taken out of Idaho and immediately registered and titled in another state or country, and cannot be used in Idaho more than 90 days in any consecutive 12 months. An Idaho resident named as co-buyer, co-borrower, co-applicant for title or registration, or a party on any sales document kills the exemption, as does an Idaho driver's license or Idaho address.[3]

On paper that means Form ST-104NR - Sales Tax Exemption Certificate - Nonresident Vehicle/Vessel, filled out at delivery. If the form never gets signed, the dealer eats the tax, not the buyer.

Then comes the part nobody staples to the deal jacket: moving the title, issuing the temp tag, and getting the registration done in the buyer's state. That handoff chain is what Voltra's title tracking was built to watch.

Buying in Idaho from out of state

If you live in another state and buy in Idaho, the deciding rule is where the vehicle gets registered: your home state's tax applies at registration, and what happens at the Idaho sale depends on the row above. Idaho credits sales tax legally paid to another state, so the same dollars are not taxed twice.[4]

Registration and temp tags

Idaho registration is for Idaho residents and businesses. The vehicle has to belong to an Idaho resident or business, it must be titled in Idaho before it can be registered, and the registrant needs a verifiable physical address and mailing address.[6] Idaho dealers issue 30-day temporary registration permits, which ITD lists as being for out-of-state residents only. Dealers buy them from ITD in books of 20 (order form ITD 3763). Validity: 30 days.[5]

Bordering states

Cross-border deals from Idaho most often involve Montana, Nevada, Oregon, Utah, Washington and Wyoming. Treat each pairing as its own problem and put it through the out-of-state checker.

Vehicle-type exceptions

RVs that must be registered for road use are taxed as motor vehicles at the same 6%: motor homes, travel trailers, fifth-wheel trailers, fold-down camping trailers, and park model RVs (new and used). Off-road machines are not motor vehicles and follow separate rules, including snowmobiles, boats, truck campers, aircraft, ATVs and UTVs, off-road motorcycles, and modified park model RVs.[7]

Sources

  1. tax.idaho.gov/taxes/sales-use/online-guide/ · verified 2026-08-27
  2. tax.idaho.gov/taxes/sales-use/transportation/motor-vehicles/dealers/sales-price/ · verified 2026-08-27
  3. tax.idaho.gov/taxes/sales-use/transportation/motor-vehicles/dealers/exemptions/ · verified 2026-08-27
  4. tax.idaho.gov/taxes/sales-use/use-tax/credit/ · verified 2026-08-27
  5. itd.idaho.gov/dmv/vehicle-dealers/ · verified 2026-08-27
  6. itd.idaho.gov/dmv/registrations-plates-titles/vehicle-registrations/ · verified 2026-08-27
  7. tax.idaho.gov/taxes/sales-use/transportation/motor-vehicles/nondealers/online-guide/ · verified 2026-08-27

Idaho car sales tax questions

Idaho taxes vehicle sales at 6%. It applies to the taxable price the desk calculates, and the trade-in and doc-fee rules are what shape that figure.

Idaho taxes the price after the trade-in is deducted. The dealer must put the trade-in into resale inventory, and the trade and all documentation must happen at the time of sale or the allowance does not reduce the sales price. Manufactured homes and modified park model recreational vehicles cannot be taken in trade. The taxable price rides on that treatment, so identical deals can carry different tax bills depending on the state.

Idaho exempts out-of-state buyers only under specific conditions: The buyer must be a nonresident and the vehicle must be intended for use outside Idaho and not require Idaho titling. It must be taken out of Idaho and immediately registered and titled in another state or country, and cannot be used in Idaho more than 90 days in any consecutive 12 months. An Idaho resident named as co-buyer, co-borrower, co-applicant for title or registration, or a party on any sales document kills the exemption, as does an Idaho driver's license or Idaho address. The exemption runs on Form ST-104NR - Sales Tax Exemption Certificate - Nonresident Vehicle/Vessel, completed at delivery.

Idaho credits sales tax legally paid to another state, so the same dollars are not taxed twice.

Tax applies to the doc fee as well.