What a bill of sale is and why Arizona requires it
A bill of sale is a document that proves you sold or gave a vehicle to someone else. In Arizona, the bill of sale is not the title itself — it is a record of the transaction that happens before or alongside the title transfer. The Arizona Department of Transportation (ADOT) does not require a bill of sale to process a title transfer, but it is the paper trail that protects both the buyer and seller if questions come up later about who owned the vehicle on a specific date.
When you sell a car in Arizona, the buyer needs proof that you transferred ownership to them. The bill of sale serves as that proof. It shows the sale price, the date, the vehicle identification number (VIN), and the signatures of both parties. If you sell without one and the buyer later gets into an accident or receives a traffic ticket, you could be held liable because the title still shows your name until the buyer registers it.
The bill of sale also protects the buyer. It documents that you represented the vehicle in a certain condition and that you received payment. If the vehicle breaks down the day after purchase and you claim you never sold it, the bill of sale is evidence against that claim.
Key Takeaways
- Arizona does not have a state-mandated bill of sale form, but you can use the form provided by ADOT or create your own document as long as it includes the VIN, sale price, date, and signatures of both buyer and seller.
- The bill of sale is separate from the title and is not filed with ADOT — it stays with the buyer as proof of purchase.
- Both the buyer and seller should keep a signed copy for their records, and the original should go to the buyer.
- You do not need a notary to sign a bill of sale in Arizona, though having it notarized adds an extra layer of protection.
What information must go on an Arizona bill of sale
An Arizona bill of sale must include the vehicle identification number (VIN), which is the 17-character code unique to that car. You can find it on the dashboard on the driver's side, on the title document itself, or on the vehicle registration card. Without the VIN, the document does not clearly identify which vehicle was sold, and ADOT or a court could question whether it applies to your transaction.
The bill of sale must also show the sale price, the date of the sale, and the full names and addresses of both the buyer and the seller. Some people leave the price blank or write "as is" to avoid taxes, but this is not legal in Arizona. The actual amount paid must be listed. If you are giving the vehicle away, write the sale price as zero or "gift" — this is acceptable and legal.
Both the buyer and seller must sign the bill of sale. The signatures do not have to be notarized in Arizona, but a notary's stamp does make the document stronger evidence if there is ever a dispute. If you are selling on behalf of a business or estate, make sure the person signing has the legal authority to do so.
Using ADOT's bill of sale form versus creating your own
The Arizona Department of Transportation provides a bill of sale form on its website, but it is optional. You can read and print the ADOT form, fill it out, and use it for your transaction. The form includes all the required fields and is designed to be clear and complete.
You can also write your own bill of sale as long as it contains all the required information: VIN, sale price, date, buyer name and address, seller name and address, and signatures from both parties. Some people use a straightforward letter or a form from a third-party website. As long as the document is signed by both parties and includes the core details, it will hold up as proof of sale.
The advantage of using ADOT's form is that it is already formatted correctly and includes all necessary fields, so there is less chance of leaving something out. The advantage of writing your own is flexibility — you can add extra details or conditions if needed, such as "sold as is" or "no warranty."
When the bill of sale is signed and who keeps it
The bill of sale should be signed at the time of the sale, ideally before the money changes hands. Both the buyer and the seller should sign and date it. Each party should keep a copy for their records.
The original bill of sale stays with the buyer. The buyer will need it when they go to register the vehicle with ADOT and get a new title in their name. The seller should keep a copy to prove they no longer own the vehicle. If the buyer later gets a ticket or is involved in an accident before the title is transferred, the seller can show their copy of the bill of sale to prove they sold the vehicle and are not responsible.
The bill of sale is not filed with ADOT. You do not mail it in or submit it as part of the title transfer process. It is a private document between the buyer and seller. However, the buyer will bring it to the ADOT office or submit it online when they register the vehicle and request a title in their name.
How the bill of sale connects to the title transfer process
The bill of sale is the first step in proving ownership changed hands. After the bill of sale is signed, the buyer takes it to ADOT along with the current title (signed by the seller), proof of insurance, and payment for the title transfer fee. ADOT uses these documents to issue a new title in the buyer's name.
If the seller does not sign the title or if the bill of sale and title do not match (for example, if the VIN on the bill of sale differs from the VIN on the title), ADOT will reject the process and ask for corrections. This is why it is critical that both documents are accurate and consistent.
In Arizona, the seller must sign the back of the title to release ownership. The bill of sale alone does not transfer the title — it is supporting documentation. The title itself is the legal proof of ownership, and it must be signed and submitted to ADOT for the transfer to be complete.
What to do if you lose the bill of sale or need a copy later
If you signed a bill of sale but did not keep a copy, you can ask the other party for one. If they will not provide it, you can recreate it based on your memory of the transaction, have both parties sign it again, and date it with the original sale date. This is not ideal, but it is better than having no documentation at all.
If you are the seller and need to prove you sold the vehicle but the buyer has disappeared or refuses to provide a copy, your bank or payment records (if you used a check or electronic transfer) can serve as backup evidence. A cancelled check or a record of a wire transfer shows that money changed hands on a specific date, which supports your claim that a sale occurred.
If you are the buyer and the seller will not sign a bill of sale before you hand over money, do not complete the purchase. A bill of sale is your protection. Without it, you have no proof that the seller agreed to transfer the vehicle to you, and you could lose both the money and the car.
Notarization and extra protections
Arizona does not require a bill of sale to be notarized, but having a notary public witness the signatures adds credibility to the document. A notary verifies the identity of the people signing and confirms that they are signing of their own free will. If there is ever a legal dispute about the sale, a notarized bill of sale is stronger evidence than an unsigned one.
Notarization costs between $5 and $15 per signature in Arizona, depending on the notary. Many banks offer notary services to their customers for free or at a low cost. You can also find notaries at UPS stores, FedEx locations, and some law offices. If you are buying or selling an expensive vehicle or if you are concerned about the other party's honesty, notarization is worth the small cost.
Another protection is to have the bill of sale witnessed by a third party — a friend, family member, or colleague who is present during the signing. The witness can sign the document as well, adding another layer of proof that the transaction occurred as described.
Frequently Asked Questions
Do I need a bill of sale if I am trading in my car at a dealership?
No. Dealerships handle the title transfer directly with ADOT and do not use a bill of sale. The dealership will have you sign the title and other paperwork, and they manage the rest. A bill of sale is for private sales between individuals.
What if the buyer and seller disagree on the sale price after the bill of sale is signed?
The bill of sale is a binding record of what was agreed to at the time of signing. If the buyer later claims the price was different, the signed bill of sale is evidence of what was actually agreed. This is why both parties should review the bill of sale carefully before signing and make sure the price is correct.
Can I sell a vehicle without a bill of sale in Arizona?
Technically, you can transfer a title without a bill of sale if you sign the back of the title itself. However, a bill of sale is strongly recommended because it creates a clear record of the transaction and protects both parties. Without it, there is no documentation of the sale price, the condition of the vehicle, or the date the sale occurred.
Is a bill of sale the same as a title?
No. The title is the legal document issued by ADOT that proves ownership of the vehicle. The bill of sale is a record of the transaction between buyer and seller. The title must be signed and submitted to ADOT to complete the transfer. The bill of sale stays with the buyer as proof of purchase.
What if I bought a vehicle and the seller will not sign the title?
If the seller refuses to sign the title, the transfer cannot be completed, and you will not become the legal owner. You should not hand over money until the seller signs both the bill of sale and the title. If this situation occurs, contact ADOT or a local attorney for guidance on how to proceed.