Complete Guide To The California DMV Bill Of Sale For 2026

Note: This guide focuses exclusively on the official California Department of Motor Vehicles (DMV) vehicle and vessel transfer documentation requirements, specifically the proper execution and legal necessity of a bill of sale.

Navigating vehicle transactions in the Golden State requires absolute adherence to state regulations. When buying or selling a car, truck, or motorcycle, executing a proper California DMV bill of sale is a critical legal safeguard. While the California DMV provides a standardized template known as Form REG 135, understanding when it is mandatory, how to fill it out accurately, and what supporting documents are required will protect both parties from future legal and financial liabilities.

As vehicle values fluctuate and state compliance standards tighten in 2026, utilizing the correct documentation ensures a seamless title transfer at your local DMV field office or through authorized business partner registration services.

Legal Framework and When a California Bill of Sale Is Mandatory

The California Vehicle Code mandates that vehicle ownership transfers must be documented meticulously. Although the back of the California Certificate of Title features designated fields for buyer and seller signatures, odometer disclosure, and purchase price, a separate bill of sale is frequently required or strongly advised.

The California DMV officially mandates a bill of sale under specific operational conditions:

• The Title Is Missing or Lost: When a duplicate title (Form REG 227) is being requested alongside a transfer of ownership, a bill of sale establishes the chain of custody and purchase price.
• Gift Transactions: If a vehicle is transferred as a gift or for a nominal sum (such as zero dollars or one dollar), the DMV requires a statement of facts or a bill of sale to evaluate potential use tax exemptions or determinations.
• Low-Value Vehicles: For vehicles valued under specific statutory thresholds where a bonded title or specialized evaluation is necessary, comprehensive transactional paperwork is audited closely by DMV compliance officers.
• Discrepancies in Purchase Price: If the stated purchase price on the title application deviates significantly from the estimated market value, the DMV may request a bill of sale to verify the correct amount for use tax calculations.

Essential Data Fields on the California DMV REG 135 Form

Executing Form REG 135 correctly eliminates processing delays at the DMV counter. Every line item serves a distinct legal purpose for both the buyer and the seller. Omitting information or entering conflicting data can trigger a rejection of the transfer application, resulting in late penalties or continued liability for the seller.

The following components must be documented accurately on the bill of sale:

1. Vehicle Identification Number (VIN): This 17-digit alphanumeric code must match the physical VIN plate on the vehicle's dashboard and the existing title document precisely. A single-digit error invalidates the document.
2. Vehicle Details: Complete description including the make, model, year, body type, and primary color.
3. Purchase Price: The exact monetary amount exchanged for the vehicle. Entering a false low price to evade use tax constitutes tax fraud and carries severe penalties from the California Department of Tax and Fee Administration (CDTFA).
4. Buyer and Seller Information: Legal printed names, physical addresses, and telephone numbers for all participating parties.
5. Signatures and Dates: Wet-ink signatures from both the buyer and the seller, accompanied by the exact date of the transaction. If there are multiple registered owners listed on the title, all designated parties must sign according to the conjunction rules on the front of the title (e.g., "AND" vs. "OR").

Compliance Reminder for Sellers: Completing a bill of sale does not automatically release you from civil or criminal liability in California. You must file a Notice of Transfer and Release of Liability (REG 138) with the DMV within five calendar days of the sale to ensure you are no longer responsible for parking tickets, toll violations, or civil lawsuits stemming from vehicle operation.

Step-by-Step Execution Guide for Buyers and Sellers

Executing a smooth vehicle transaction involves a structured workflow. Following these chronological steps safeguards your financial interests and ensures compliance with California state law.

• Step 1: Verify Vehicle Identity and Ownership: Before exchanging funds, inspect the physical VIN against the current California Certificate of Title. Ensure the seller is the registered owner listed on the title or possesses a properly endorsed reassignment document.
• Step 2: Complete Smog Certification: In California, the seller is legally responsible for providing a valid smog inspection certificate that is valid for 90 days from the test date, unless the vehicle is exempt (e.g., gasoline-powered vehicles less than four model years old, electric vehicles, trailers, or diesel vehicles manufactured prior to 1998 or with a gross weight rating over 14,000 pounds).
• Step 3: Draft and Sign the Bill of Sale: Fill out Form REG 135 or a comprehensive bill of sale containing all required vehicle descriptors, sale price, and signatures. Both parties should retain a signed copy for their records.
• Step 4: Endorse the Title Document: The seller must sign and date the designated release line on the California Certificate of Title and complete the odometer mileage disclosure section.
• Step 5: Submit Documentation and Fees: Within 10 days of the purchase, the buyer must submit the endorsed title, smog certificate (if applicable), bill of sale, and applicable transfer and registration fees to the California DMV to avoid late penalties.

Comparative Overview of Transfer Documentation Requirements

Understanding the differences between the various forms required during a California vehicle transfer prevents administrative delays.

Frequently Asked Questions

Is a bill of sale legally required to transfer a car title in California?

A separate bill of sale is not strictly mandatory if the back of the California Certificate of Title is fully completed, signed, and dated by both parties. However, it is legally required if the title is lost, if the vehicle is transferred as a gift, or if the DMV requests purchase price verification for tax purposes.

Can I write my own bill of sale by hand?

Yes, a handwritten bill of sale is legally acceptable in California as long as it includes the vehicle make, model, year, VIN, purchase price, date of sale, and the clear signatures of both the buyer and the seller. Using the official California DMV Form REG 135 is recommended to prevent omissions.

Who pays the use tax on a private vehicle sale in California?

The buyer is responsible for paying the use tax, which is calculated based on the purchase price and the county of residence where the vehicle will be registered. This tax is collected directly by the DMV at the time of title transfer and registration.

What should I do if the vehicle title is lost before the sale?

The registered owner must apply for a duplicate title using Form REG 227 before completing the sale, or the buyer and seller can execute a bill of sale alongside the duplicate title application packet to document the transfer of ownership legally.

How does submitting a Notice of Release of Liability protect the seller?

Filing Form REG 138 notifies the California DMV that you no longer possess the vehicle, shielding you from liability for parking tickets, toll violations, red light camera citations, and civil lawsuits arising from accidents occurring after the date of sale.

Are notarized bills of sale mandatory in California?

No, the California DMV does not require a bill of sale or vehicle title signatures to be notarized, provided the signatures are genuine and match the official identification of the participating parties.

Professional Conclusion and Next Steps

Executing a proper California DMV bill of sale and completing all mandatory title transfer steps ensures complete legal compliance and protects both parties from financial risk. Whether you are finalizing a private party purchase or gifting a vehicle within your family, maintaining meticulous records is essential. To proceed with your transaction, download the official Form REG 135 directly from the California DMV portal, verify all vehicle identification numbers, and ensure your Notice of Transfer and Release of Liability is filed immediately after the keys change hands.