Idaho — quick answer
In Idaho, a bill of sale is recommended for a private vehicle sale and notarization is situational. No witnesses are required. The relevant state form is ITD 3738. Ownership is transferred through the Idaho ITD via the assigned title.
Is a bill of sale required in Idaho?
Recommended. A bill of sale is recommended and used to support the title transfer.
Seller signs the title; the buyer titles at the county assessor (DMV) office.
Does a Idaho bill of sale need to be notarized?
Situational (situational). Notarization is required only when the title transfer is completed by mail. In person, a county deputy can witness the signature instead.
Witness requirements
No. Idaho does not require witnesses for a standard private bill of sale.
Odometer disclosure
Federal law requires a written odometer disclosure when title is transferred for vehicles less than 20 years old. As of 2026 that means model year 2011 and newer; model year 2010 and older are generally exempt. Record the exact mileage — never round it. See the NHTSA rule.
How to transfer a vehicle title in Idaho
- 1Complete the bill of sale and title assignment.
Fill in the buyer, seller, price, odometer, and date. Both parties sign and date the document.
- 2Hand over the signed title.
Seller signs the title; the buyer titles at the county assessor (DMV) office.
- 3Register with the Idaho ITD.
The buyer titles and registers the vehicle, bringing Bill of Sale (ITD 3738). Confirm the current fees and documents on the official Idaho ITD page.
Official Idaho sources
- Idaho Transportation Department (ITD), DMV — buying & selling a vehicle
- NHTSA — federal odometer disclosure rule
We link to primary government sources and review this page regularly, but requirements change. This is general information, not legal advice.
Idaho bill of sale by type
Get requirements and a free template tailored to Idaho for each item type — the generator applies the Idaho notary and witness rules automatically:
Idaho bill of sale — FAQ
Is a bill of sale required in Idaho?
In Idaho, a separate bill of sale is recommended. A bill of sale is recommended and used to support the title transfer.
Does a Idaho bill of sale need to be notarized?
Sometimes. Notarization is required only when the title transfer is completed by mail. In person, a county deputy can witness the signature instead.
Do I need a witness for a bill of sale in Idaho?
No. Idaho does not require witnesses for a standard private bill of sale.
How do I transfer a vehicle title in Idaho?
Seller signs the title; the buyer titles at the county assessor (DMV) office. Titling and registration in Idaho are handled by the Idaho Transportation Department (ITD), DMV.
Is a bill of sale proof of ownership?
Generally no. For titled property like a car or boat, the title is what proves ownership. A bill of sale proves that a sale happened and records the price, date, and terms — it supports the title transfer but does not replace it. For untitled property (furniture, equipment, electronics), the signed bill of sale is usually the main proof of ownership.