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Yes! You can use AI to fill out California Department of Motor Vehicles (DMV) Form REG 135, Bill of Sale

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California Department of Motor Vehicles (DMV) Form REG 135, Bill of Sale, page 1
Moderate · 47/100Form Complexity Index

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What this form asks for

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California DMV Form REG 135, Bill of Sale, is an official document used to record the transfer of ownership of a vehicle or vessel from a seller to a buyer, including key identifying information (VIN/hull ID, year, make, plate/CF#) and the transaction terms (sale price or gift value/relationship). It helps provide proof of the transaction for registration, title, and tax-related purposes and can be kept for both parties’ records. The form includes seller certification under penalty of perjury and signature blocks to support the accuracy of the information provided. Today, this form can be filled out quickly and accurately using AI-powered services like Instafill.ai, which can also convert non-fillable PDF versions into interactive fillable forms.
Fillable fields35
Pages1
Sections5
Tables and lists2
Questions that depend on earlier answers2
Form Complexity IndexModerate, 47/100

The AI checks your answers before you download

16 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.

VIN/Hull ID presence and allowed character set validation

Validates that the Identification Number (VIN/Hull ID) is provided and contains only permitted characters for the asset type. For VINs, reject illegal characters (I, O, Q) and enforce uppercase alphanumeric formatting to reduce transcription errors. This is critical because the identification number uniquely ties the bill of sale to the correct vehicle/vessel; if it fails, the submission should be rejected and the user prompted to re-enter the value exactly as shown on title/registration.

VIN length/structure check (17-character VIN) with vessel exception handling

Checks that a vehicle VIN is exactly 17 characters and not shorter/longer, while allowing a different length/pattern when the user indicates a vessel hull ID (if your system captures that context). This prevents invalid identifiers that cannot be matched by DMV systems or downstream validation services. If the length/structure does not match the expected pattern for the selected asset type, block submission and request correction.

Model year format and plausible range validation

Ensures Year Model is a 4-digit year and falls within a plausible range (e.g., 1900 through next calendar year) and is not in the far future. This reduces data entry mistakes such as missing digits or transposed numbers. If invalid, the form should not submit and should display an error indicating the required 4-digit year and acceptable range.

Make field completeness and character validation

Validates that Make is not blank and contains reasonable characters (letters, numbers, spaces, hyphens) without excessive punctuation or purely numeric values. The make is used for identification and matching to registration/title records; malformed values can cause processing delays. If it fails, require the user to enter a recognizable manufacturer/brand name.

License Plate / CF Number format validation

Checks that License Plate/CF# is present and matches expected formatting rules (alphanumeric, length constraints, no invalid symbols), with optional branching for CA vessel CF numbers if applicable. This helps ensure the plate/CF number can be used to cross-reference registration records. If the value contains invalid characters or is outside length limits, reject and prompt for the exact value shown on registration.

Motorcycle engine number conditional requirement and format check

Validates that Motorcycle Engine Number is either blank (when not applicable) or, if provided, meets basic serial-number formatting rules (alphanumeric, reasonable length, no prohibited symbols). This prevents accidental entry of unrelated numbers (e.g., VIN repeated) or unusable engine identifiers. If the field is populated but fails format checks, require correction; if your workflow indicates the asset is a motorcycle and the field is required, block submission when missing.

And 10 more checks
  • Seller name(s) required and consistent across sections
  • Buyer name(s) required and consistent across sections
  • Sale date digit fields completeness and valid calendar date check
  • Sale date reasonableness and sequencing vs. signature dates
  • Selling price currency format and non-negative validation
  • Gift vs. sale mutual exclusivity and required fields enforcement
  • Gift relationship required when gift value is provided (and vice versa)
  • Seller address completeness and USPS-style ZIP validation
  • Buyer address completeness and state/ZIP format validation
  • Seller daytime phone number format validation

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How to Fill Out REG 135 Online for Free in 2026

What the AI walks you through.

  1. Go to Instafill.ai and upload the REG 135 (Bill of Sale) PDF or select it from the form library.
  2. Let the AI detect and map the fields, then confirm the form type (California DMV REG 135) and the number of sellers/buyers.
  3. Enter the vehicle/vessel description details: identification number (VIN/hull ID), year model, make, license plate/CF number, and motorcycle engine number (if applicable).
  4. Fill in the sale/transfer section: seller name(s), buyer name(s), sale date (month/day/year), and either the selling price or (if a gift) the relationship and gift value.
  5. Complete seller information fields: printed name(s), DL/ID or dealer number(s), mailing address, city, state, ZIP code, and daytime phone number.
  6. Review all entries for accuracy against the title/registration, then apply e-signatures (if supported) or prepare the form for wet signatures and dating.
  7. Download the completed form, print if needed, and save copies for both buyer and seller records.

Common Mistakes in Completing REG 135

The ones the AI is built to catch.

VIN/Hull ID entered incorrectly or not exactly as on the title
People often transpose characters (e.g., 0 vs O, 1 vs I), omit a digit, or copy the wrong identifier from an insurance card instead of the title/registration. An incorrect VIN/hull ID can cause the DMV to reject the bill of sale or delay title transfer because the vehicle/vessel can’t be matched to the record. Always copy the identification number directly from the title/registration and double-check character-by-character. AI-powered form filling tools like Instafill.ai can help by validating length/format and reducing transcription errors.
Mixing up License Plate number and CF number (or leaving the wrong one blank)
This form covers both vehicles and vessels, so filers sometimes enter a boat CF# in the license plate field incorrectly, or they leave the field blank because they’re unsure which applies. Using the wrong identifier can create confusion during processing and may trigger follow-up requests for clarification. Confirm whether the item is a vehicle (license plate) or vessel (CF#) and enter the exact current number shown on registration. Instafill.ai can prompt the correct identifier type and format it consistently.
Incorrect model year or using purchase year instead of model year
A common mistake is entering the year the vehicle was bought or first registered rather than the model year shown on the title/registration. This mismatch can slow down DMV processing and create discrepancies in the buyer’s new registration record. Use the model year from the title/registration (e.g., “2018”), not the sale year. Instafill.ai can cross-check the year against other vehicle details you provide to catch inconsistencies.
Make/manufacturer entered as a model name or abbreviated inconsistently
Filers sometimes write the model (e.g., “Civic”) instead of the make (e.g., “Honda”), or use informal abbreviations that don’t match DMV records. This can lead to record mismatches and additional verification steps. Enter the manufacturer/brand exactly as it appears on the title/registration. Instafill.ai can standardize common makes and reduce mismatched naming.
Motorcycle engine number filled in when not applicable (or left blank when required)
Because the field is labeled for motorcycles, people sometimes enter an engine number for cars/boats, or they skip it for motorcycles even when it’s available on the engine/title. Incorrect or missing engine information can complicate verification for motorcycle transfers. Only complete this field if the transaction involves a motorcycle and you can confirm the engine serial number from the engine or title. Instafill.ai can help by conditionally prompting this field only when “motorcycle” applies.
Sale date entered in the wrong digit boxes or wrong format
This form uses separate boxes for each digit of month/day/year, and people often write a full date in one area, swap month/day, or enter a four-digit year instead of two digits. An invalid or ambiguous sale date can cause processing delays and disputes about the effective transfer date. Enter two digits for month, two for day, and two for year (e.g., 08/07/26) in the correct boxes. Instafill.ai can format dates automatically into the required digit-by-digit fields.
Selling price and gift fields both filled (or gift relationship/value missing)
Many filers enter a selling price and also fill gift value/relationship “just in case,” or they mark it as a gift but forget the relationship and gift value. This creates contradictory information that can trigger DMV questions and may affect tax/fee calculations. If it’s a sale, enter only the selling price; if it’s a gift, leave selling price blank or zero and complete gift relationship and gift value. Instafill.ai can enforce the rule that gift fields should only be completed when selling price is blank/zero.
Seller/buyer names not printed fully or not matching legal/title names
People often use nicknames, initials, or omit a co-owner/co-buyer, especially when the title has multiple owners. Name mismatches can cause the transfer to be rejected or require additional documentation to prove identity/ownership. Print full legal names exactly as they appear on the title and IDs, and include all sellers/buyers when applicable. Instafill.ai can reuse verified identity data consistently across all name fields to prevent mismatches.
Missing signatures, dates, or DL/ID/dealer numbers for one of the sellers
When there are two sellers, it’s common for one person to sign but forget to date, or to omit the DL/ID/dealer number, especially because the form repeats sections and can be confusing. Missing signature elements can invalidate the bill of sale or delay acceptance. Ensure each seller prints their name, signs, dates, and provides the correct DL/ID or dealer number in the corresponding line. Instafill.ai can flag incomplete signature blocks before you finalize the form.
Address and contact details incomplete or formatted incorrectly (ZIP, state, phone)
Filers frequently forget apartment/unit numbers, omit leading zeros in ZIP codes, write a full state name where an abbreviation is expected, or leave out the phone area code. Incomplete contact information can prevent follow-up communication and may slow processing if the DMV needs clarification. Enter a complete mailing address, include the correct state and full ZIP, and provide a daytime phone number with area code. Instafill.ai can auto-format addresses/phone numbers and validate ZIP/state consistency.
Filling the wrong copy/section or not keeping a record after cutting on the line
Because the form content appears duplicated and includes “CUT ON LINE AND SAVE FOR YOUR RECORDS,” people sometimes complete only one portion incorrectly, cut the wrong area, or fail to retain a copy. This can leave the buyer or seller without proof of the transaction if disputes arise. Complete the intended bill of sale section carefully, then keep a legible copy for both parties before cutting or submitting. If the form is a flat non-fillable PDF, Instafill.ai can convert it into a fillable version and help ensure both copies are completed consistently.

Frequently Asked Questions About REG 135

 

Is it really free for 7 days?
Yes. You pay $0 today. Cancel before Nov 17 and you are never charged. Keep it, and it is $19.99 a month for 5 fills of your REG 135.
Can I fill other forms too?
This plan is for your REG 135: your own AI agent fills it as often as 5 times a month. To fill other forms and upload your own, choose a Professional plan from your account.
How do I cancel?
From your account, in two clicks, any time. No email, no call.
How does the AI fill out REG 135?
You answer a few questions in plain words, or upload your driver's license. The AI reads what you give it and puts each answer into the right field of REG 135, on every page, in seconds. It checks the answers against the form's own rules, and you review and change anything before you download, print or sign.
What happens to my information?
It is encrypted in transit and at rest, and it is never used to train AI.
How complex is REG 135 to fill out?
REG 135 has a Form Complexity Index of 47 out of 100, in the moderate tier: 35 fillable fields across 1 page. Instafill.ai's AI fills it in under a minute, with every field there for you to review before you download.
What is this form (REG 135) used for?
REG 135 is a California DMV Bill of Sale used to document the sale, transfer, or gift of a vehicle or vessel. It records key details like the VIN/hull ID, buyer and seller information, date of transfer, and price or gift value.
Who needs to fill out the REG 135 Bill of Sale?
Typically, the seller completes and signs it, and the buyer’s information is included on the form. It’s commonly used when transferring ownership and keeping a written record of the transaction.
Is REG 135 required to transfer a vehicle in California?
It may be requested to support the transfer, especially if the title paperwork is incomplete or additional proof of the transaction is needed. Even when not strictly required, it’s a good record for both buyer and seller.
What information do I need before I start filling out this form?
You’ll need the vehicle/vessel identification number (VIN or hull ID), year, make, license plate or CF number, buyer and seller names and addresses, the sale date, and the selling price or gift value. If it’s a motorcycle, you may also need the engine number (if applicable).
Where do I find the Identification Number (VIN/Hull ID) to enter on the form?
Use the VIN/hull ID exactly as shown on the title, registration, or certificate. Copy it carefully to avoid delays or mismatches with DMV records.
What do I enter for “License Plate/CF #”?
Enter the current license plate number for a vehicle or the CF (Certificate of Number) for a vessel, exactly as shown on the registration. If you’re unsure, check the most recent registration card.
Do I have to fill in the Motorcycle Engine Number field?
Only fill it out if it applies to your transaction and you have a motorcycle engine number to report. If it’s not a motorcycle or not applicable, leave that field blank.
How do I fill out the sale date boxes (month/day/year) since they are split into digits?
Enter each digit separately in the corresponding boxes (e.g., August is 0 then 8; the 7th is 0 then 7; 2026 is 2 then 6 for the two-digit year). Use the date the vehicle/vessel was actually sold or transferred.
What should I put for Selling Price vs. Gift Value?
If it was a sale, enter the total amount paid in the Selling Price field. If it was a gift, leave Selling Price blank or zero, then enter the relationship and the Gift Value.
If the vehicle/vessel was a gift, what relationship should I write?
Write how the recipient is related to the giver (for example: parent, spouse, child, friend). This should reflect the real relationship at the time of the transfer.
Do both sellers need to sign if there are two sellers listed?
Yes—if two sellers are involved (for example, co-owners), each seller should print their name, sign, and date the form, and provide their DL/ID or dealer number. This helps confirm all listed sellers agree to the transfer.
What is the “DL, ID OR DEALER #” field and who fills it out?
This is the driver’s license number, state ID number, or dealer number for the seller(s). Each seller listed should provide their own number in the corresponding seller section.
Where do I submit this Bill of Sale after it’s completed?
This form is generally kept as proof of the transaction and may be submitted or presented to the California DMV if requested as part of a transfer/registration process. Follow the DMV’s instructions for your specific transaction or include it with your ownership transfer paperwork if needed.
Can AI help me fill out this form accurately?
Yes—AI tools can help reduce errors and save time by auto-filling fields from the information you provide. Services like Instafill.ai can map your details into the correct REG 135 fields and help you review everything before signing.
How do I fill out REG 135 online using Instafill.ai?
Upload the REG 135 PDF to Instafill.ai, enter or import your buyer/seller and vehicle details, and let the AI auto-fill the form fields. Then review the completed form, download it, and print/sign where required.
What if my REG 135 PDF is not fillable (a flat/scanned PDF)?
If the PDF isn’t fillable, Instafill.ai can convert a flat, non-fillable PDF into an interactive fillable form. After conversion, you can auto-fill the fields and export a clean, typed version for printing and signatures.
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Other forms like this one

DMV forms: California DMV Form REG 17 (Rev. 7/2012), Special Interest License Plate Application, California DMV Form REG 17 (Rev. 7/2012), Special Interest License Plate Application, Application for Renewal or Duplicate of Alabama Driver License or ID card, Colorado Form DR 0026, Tax Statement for Leased Motor Vehicle, Form 40-5122, Travel License / Identification Application, Form 735-501, Vehicle Bill of Sale, Form D1, Driver License, Permit or Identification Card Transaction Application, Form DR 2020SP, Exception Processing Application, Form MV-82TON, Application for Title, Form OL 75, Auto Broker Log, Form REG 227, Application for Replacement or Transfer of Title, Form VR-005, Application for Certificate of Title, Letter of Authorization - County of Kauai Department of Finance, Division of Motor Vehicles & Licensing, Form REG 343, Application for Title or Registration (Rev. 2/2012), REG 230, Motorized Bicycle Application

California DMV forms: California DMV Form REG 17 (Rev. 7/2012), Special Interest License Plate Application, California DMV Form REG 17 (Rev. 7/2012), Special Interest License Plate Application, Form OL 75, Auto Broker Log, Form REG 227, Application for Replacement or Transfer of Title, Form REG 343, Application for Title or Registration (Rev. 2/2012), REG 230, Motorized Bicycle Application

motor vehicle forms: Colorado Form DR 0026, Tax Statement for Leased Motor Vehicle, Form 8910, Alternative Motor Vehicle Credit, State of Florida Department of Highway Safety and Motor Vehicles (FLHSMV) Form HSMV 82993, Separate Odometer Disclosure Statement and Acknowledgment, Letter of Authorization - County of Kauai Department of Finance, Division of Motor Vehicles & Licensing, Form 735-501, Vehicle Bill of Sale, Form DR 0024, Standard Sales Tax Receipt for Vehicle Sales, Form DR 2020SP, Exception Processing Application, Form MV-82TON, Application for Title, Form VR-005, Application for Certificate of Title, Georgia Department of Revenue Form T-7, Bill of Sale, Form MV-104, Report of Motor Vehicle Accident, Form DTF-802, Statement of Transaction – Sale or Gift of Motor Vehicle, Trailer, All-Terrain Vehicle (ATV), Vessel (Boat), or Snowmobile, Form HSMV 82050, Notice of Sale and/or Bill of Sale for a Motor Vehicle, Mobile Home, Off-Highway Vehicle or Vessel, Power of Attorney for a Motor Vehicle, Mobile Home, or Vessel, Emancipated Minor's Application to California Department of Motor Vehicles, Form PLD-PI-001(1), Cause of Action—Motor Vehicle, Small Claims Complaint - Motor Vehicle - Appendix XI-D, Supplemental Plea Form for Eluding (N.J.S.A. 2C:29-2b) or Theft of a Motor Vehicle or Unlawful Taking of a Motor Vehicle (N.J.S.A. 2C:20-2.1) (Plea 07), Complaint and Proposed Form of Order for Action Seeking Title to Motor Vehicle, Form REG 343, Application for Title or Registration (Rev. 2/2012)

vehicle bill of sale forms: Form 735-501, Vehicle Bill of Sale, Form HSMV 82050, Notice of Sale and/or Bill of Sale for a Motor Vehicle, Mobile Home, Off-Highway Vehicle or Vessel

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