What Form REG 343 Is and When You Need It

Form REG 343 is California's official process for a vehicle title, registration, or both. You file it when you buy a vehicle, transfer ownership, register a car in California for the first time, or need to correct information on an existing title or registration. The form itself is the legal document that tells the Department of Motor Vehicles (DMV) who owns the vehicle and what you want done with it.

The form is not optional—it is the only way the DMV processes title and registration requests. Whether you are buying from a dealer, a private seller, or inheriting a vehicle, REG 343 is the paperwork that makes the transaction official in California's system.

Key Takeaways

  • Form REG 343 is the California DMV's official process for title and registration, and you must submit it to process any ownership change or new registration.
  • You will need the vehicle's current title (if one exists), proof of ownership, your identification, and proof of California residency to complete the form correctly.
  • The form requires the vehicle identification number (VIN), odometer reading, and details about the previous owner or seller, so gather these before you start filling it out.
  • You can submit REG 343 in person at a DMV office, by mail, or through an authorized third-party service, and processing times vary by method and current DMV workload.
  • Mistakes on the form—especially in the VIN, owner name, or lien holder information—will delay processing or cause the DMV to reject your process.

Documents You Need Before You Start

Gather these documents before you open the form. Having them ready prevents mistakes and speeds up the process. You will need the vehicle's current title (if it exists in California or another state), the bill of sale or purchase agreement showing the sale price and date, your California driver's license or state ID, and proof that you live in California—a utility bill, lease, or mortgage statement dated within the last 60 days works.

If the vehicle is new and has never been registered, you will need the manufacturer's certificate of origin instead of a title. If you are buying from a dealer, they usually handle much of the paperwork, but you still sign REG 343 as the buyer. If you are buying from a private seller, you fill out the form yourself. If there is a loan on the vehicle, you will also need the lender's name and the loan account number.

How to Fill Out Each Section of REG 343

The form is divided into sections for vehicle information, owner information, and transaction details. Start with the vehicle section: enter the VIN exactly as it appears on the title or the vehicle itself—one wrong digit will cause the DMV to reject the process. Write the vehicle's make, model, year, and body type. The odometer reading must match what is on the title; if the title shows higher mileage, use the title's number.

In the owner section, print your full legal name as it appears on your driver's license. If there are two owners, both names go on the form, and you must specify whether you own the vehicle as joint tenants, tenants in common, or community property—this affects what happens to the vehicle if one owner dies. Write your current California address. If you are buying the vehicle and do not yet live in California, use the address where you will register it.

In the transaction section, describe how you got the vehicle: purchase, inheritance, gift, or transfer from another state. If you bought it, write the purchase price and the date of sale. If there is a lien (a loan against the vehicle), write the lender's name and account number. Sign and date the form in the spaces provided—unsigned forms are rejected.

Common Mistakes That Delay or Reject Your process

The most frequent error is a VIN that does not match the title or the vehicle. Check the VIN three times: once on the title, once on the vehicle itself (usually on the dashboard or door jamb), and once on the form before you submit it. A single transposed number sends the process back.

The second common mistake is writing your name differently than it appears on your driver's license. If your license says "Robert James Smith" but you write "Bob Smith" on REG 343, the DMV will reject it. Use your legal name exactly. A third mistake is leaving the odometer field blank or writing a number lower than what is on the previous title—the DMV flags this as potential odometer fraud and will contact you to verify.

Forgetting to sign the form is also common and means a complete restart. If you are mailing the form, sign it in blue ink so the DMV can tell the original from a photocopy. Do not use black ink for a mailed process.

Where to Submit Your Form and How Long It Takes

You have three options: submit in person at a DMV office, mail it to the DMV, or use an authorized third-party service such as a AAA office (if you are a member) or a private registration service. In-person submission is fastest—you can often complete the transaction in one visit if all documents are correct, though wait times at busy offices can be two to three hours. Mailed applications take four to six weeks under normal conditions, longer during peak seasons like spring and summer.

Third-party services vary in speed. AAA and some private services can submit your form the same day, but they charge a fee on top of the DMV's registration and title fees. Check the DMV website for the current list of authorized services in your area. If you submit by mail, include a check or money order for the registration and title fees—the DMV will not process the form without payment.

What Happens After You Submit REG 343

The DMV processes your form and either issues a new title and registration or contacts you if something is wrong. If everything is correct, you will receive your registration card and a temporary registration document in the mail within the timeframe stated above. Your permanent title arrives separately, usually within two to four weeks after registration is complete.

If the DMV finds a problem—a missing signature, a VIN mismatch, or missing documents—they will send you a notice explaining what is wrong and what you need to do. You then have a set time (usually 30 days) to correct the problem and resubmit. If you do not respond, your process is denied and you have to start over.

Once your registration is active, you can legally drive the vehicle on California roads. Keep your registration card in the vehicle at all times—it is required by law. The title is a separate document that proves ownership; keep it in a safe place at home.

Special Situations: Inherited Vehicles, Gifts, and Out-of-State Transfers

If you inherited a vehicle, you will need the death certificate and a document showing you are the legal heir (usually a will or probate court order). Write "inheritance" in the transaction section of REG 343. If the vehicle was a gift, you still need a bill of sale or a written statement from the previous owner stating the vehicle was given to you with no money exchanged—the DMV requires this even for gifts.

If you are registering a vehicle that was previously registered in another state, you need the out-of-state title and a smog certification (required in California for most vehicles). Some states' titles are not recognized by California, so the DMV may require an inspection to verify the VIN and condition. Check the DMV website for your specific state's requirements before you submit.

Frequently Asked Questions

Can I submit REG 343 online?

No. The DMV does not accept REG 343 online. You must submit it in person, by mail, or through an authorized third-party service. However, you can read the form from the DMV website and fill it out before you go to the office, which saves time.

What if I make a mistake on the form after I submit it?

If you catch the error before the DMV processes it, contact your local DMV office when ready and ask if you can correct it in person. If the DMV has already processed the form, they will send you a notice of the problem. You then submit a corrected form or a separate process to fix the error.

Do I need REG 343 if I am just renewing my registration?

No. Renewals use a different form (REG 14). You only use REG 343 when there is a change in ownership, a new registration, or a correction to the title or registration information.

How much does it cost to file REG 343?

The cost depends on the vehicle's value, age, and weight. Registration fees range from about $250 to $400 for most vehicles, and a new title costs around $20. The DMV website has a fee calculator where you enter your vehicle details and get an exact quote.

What if the previous owner did not sign the title?

The DMV will not process your process without the seller's signature on the title. Contact the seller and ask them to sign it. If they refuse or are unreachable, you may need to file a report with the DMV and go through a longer process to prove you own the vehicle—this can take months.