How to Fill Out California Form TR-310 (w/Examples) + FAQs

Yes, you can legally replace a missing, altered, or destroyed Vehicle Identification Number (VIN) in California by filing Form TR-310 with the California Department of Motor Vehicles (DMV). The form is called the Application for Assigned Vehicle Identification Number Plate, and it is the official path for owners of homemade, specially constructed, restored, or VIN-damaged vehicles to obtain a permanent, state-issued VIN plate that the California Highway Patrol (CHP) will inspect and affix.

Without a valid VIN, your vehicle cannot be titled, registered, insured, or legally driven on California roads. According to the National Insurance Crime Bureau, more than 850,000 vehicles were reported stolen nationwide in a recent year, and many recovered vehicles surface with altered or destroyed VINs, which is exactly the problem TR-310 was designed to fix.

Here is what this guide covers:

• 🪪 How to complete every line of Form TR-310 without triggering a rejection
• 🔧 The full CHP inspection process, including REG 31 verification and physical plate installation
• ⚖️ Federal anti-tampering rules under 18 U.S.C. § 511 and California penalties under Vehicle Code § 10750
• 🧾 The companion forms you must file, including REG 343, REG 5036, and REG 4008
• 🚗 Real-world named scenarios for kit-car builders, classic-car restorers, trailer fabricators, and motorcycle owners

What California Form TR-310 Actually Is

Form TR-310 is a one-page DMV application that asks the state to issue a new, unique VIN plate for a vehicle whose original VIN is missing, illegible, removed, altered, or destroyed. The DMV calls this number an assigned VIN, and the plate itself is a small metal tag that the CHP rivets to the vehicle frame at a verification appointment. Once the plate is installed, that assigned VIN becomes the legal identifier of the vehicle for all future titling, registration, smog, and insurance purposes.

The form exists because every motor vehicle in the United States must have a unique 17-character identifier under 49 CFR Part 565, the federal rule that governs VIN content and structure. When a vehicle is built from scratch, restored from parts, or recovered with a damaged VIN, no factory VIN exists or remains, so the state must step in and assign one. California uses TR-310 as the gateway document that triggers this state-issued assignment.

The plain-English meaning is simple. You are telling the DMV, my vehicle does not have a usable VIN, so please give me one and let CHP install it. The consequence of skipping this form is severe, because operating, selling, or registering a vehicle with no valid VIN is a misdemeanor under California Vehicle Code § 10751 and can lead to vehicle seizure. A common misconception is that owners can simply stamp or engrave their own number, but only the state, through CHP, may issue and install an assigned VIN.

Who Must Use Form TR-310

Owners of specially constructed vehicles (SPCNS), kit cars, dune buggies, homemade trailers, replicars, and street rods are the most frequent filers, because these vehicles never had a manufacturer VIN to begin with. Owners of restored classics, frame-swapped trucks, and vehicles whose VIN tag rusted off or was destroyed in a fire also use the form. Recovered stolen vehicles whose VINs were ground off by thieves are another major category.

The form is not for vehicles whose VIN is merely dirty, painted over, or hard to read. In those cases, the CHP officer can clean and verify the original number on a REG 31 Verification of Vehicle form without any assignment. A common mistake is filing TR-310 prematurely, which delays registration by weeks because CHP will reject the application and require a standard verification instead.

Statutory Authority Behind the Form

The DMV’s authority to issue assigned VINs comes from California Vehicle Code § 4161, which empowers the department to assign distinguishing numbers when a vehicle lacks one. The federal backbone is 49 U.S.C. § 33101, the Motor Vehicle Theft Prevention Act, which sets national standards for VIN integrity. Together, these laws make the assigned VIN as legally valid as any factory VIN.

The consequence of ignoring this statutory framework is that a self-stamped or counterfeit VIN can result in felony charges under 18 U.S.C. § 511, with up to five years of federal prison. A real-world example is United States v. Sullivan, where a builder who etched his own VIN on a custom chassis faced federal prosecution even though he owned every part. The takeaway is that only a CHP-affixed plate, triggered by TR-310, carries legal weight.

When You Need to File Form TR-310

You file TR-310 any time a vehicle in your possession lacks a readable, factory-issued VIN that matches the title and the public VIN sources such as NICB VINCheck or the National Motor Vehicle Title Information System. The trigger is physical, meaning the CHP officer cannot find or confirm the original number on the frame, dash, door jamb, or engine. If even one official VIN location reads correctly, you usually do not need TR-310.

The timing matters because California requires registration of newly acquired vehicles within 10 days of purchase under Vehicle Code § 4152.5. For specially constructed vehicles, the clock starts when the build is complete and ready for road use. Late filings can lead to penalty fees that compound monthly, sometimes exceeding the cost of the vehicle itself.

Common Triggering Situations

Custom builders need TR-310 the moment their kit car or street rod is operational, because no original VIN exists for a frame they welded themselves. Classic-car restorers who replaced the original frame, often the structural component that bore the VIN, must file because the new frame has no number. Owners of recovered stolen vehicles file when thieves grind off the dash and door VINs to disguise the car.

Trailer owners who built their own utility or boat trailer file TR-310 because home-built trailers never had a factory VIN. The plain-English rule is, if a CHP officer cannot find a real VIN that matches your paperwork, you need TR-310. The consequence of waiting is registration denial at the DMV counter, which can strand the vehicle in limbo for months.

Vehicles That Do Not Qualify

Vehicles with valid out-of-state titles and intact VINs do not need TR-310, even if the title is foreign or older than 1981 (when 17-digit VINs became standard under 49 CFR § 565.13). Vehicles that are merely salvage or non-operational do not need a new VIN unless the original was destroyed during repairs. Stolen vehicles that are recovered with intact VINs also do not need an assigned number.

A common misconception is that any rebuilt or salvage car needs a new VIN, but the original VIN stays with the vehicle as long as it remains physically present and matches the title. Filing TR-310 in those cases wastes the $23 plate fee and triggers an unnecessary CHP appointment. The right tool for a clean rebuilt is the standard REG 31, not TR-310.

Step-by-Step: How to Fill Out Form TR-310

The form has a single page with roughly a dozen fields, but every line carries weight, and a single missing entry can bounce the whole packet back. Read the official DMV instructions before you put pen to paper. Use black ink, print clearly, and never use correction fluid, because the CHP officer will reject any altered field.

Below is a line-by-line walkthrough of every section, the option behind each field, and the consequence of getting it wrong.

Section 1: Owner Information

This top block asks for the true legal owner of the vehicle, not the registered user, lessee, or builder. You enter the full legal name, California driver license or ID number, residence address, and mailing address if different. The plain-English rule is, match this to your driver license exactly, including middle initials and suffixes.

The consequence of mismatching names is automatic rejection at the DMV window, because the name on TR-310 must match the name on the REG 343 Application for Title and the bill of sale. A real-world example involves Maria Hernandez-Lopez, who wrote Maria Hernandez on TR-310 but Maria Hernandez-Lopez on REG 343, and her packet was returned twice before she corrected it.

A common misconception is that businesses can list a doing business as name. The DMV requires the registered legal entity name, exactly as it appears on the Secretary of State business search.

Section 2: Vehicle Description

Here you enter make, year model, body type, motive power (gas, diesel, electric, hybrid), number of cylinders, and fuel type. For specially constructed vehicles, the make is usually written as SPCNS and the year model is the year the build was completed, not the year of the donor parts. Body type uses DMV codes such as 2D for two-door, PK for pickup, TR for trailer, or MC for motorcycle.

The consequence of mislabeling the body type is that smog certification and weight fees may be calculated incorrectly. For example, David Chen listed his Cobra replica as 2D instead of CV (convertible) and was billed for a hardtop smog test he could not pass. The fix took six weeks and a REG 256 Statement of Facts to correct.

A common misconception is that the make must match the kit manufacturer (e.g., Factory Five). California requires SPCNS for almost all kits under Vehicle Code § 580.

Section 3: Reason for Assigned VIN Request

You check one of three boxes: Vehicle has no identification number, Identification number is illegible or has been destroyed, or Identification number has been altered or removed. You then write a short explanation in the comments field, such as home-built trailer, no factory VIN ever issued or VIN tag destroyed in 2024 garage fire.

The consequence of choosing the wrong box is a CHP referral for a theft investigation. If you check altered or removed, CHP will run a stolen-vehicle check through NCIC and may impound the vehicle pending clearance. The plain-English rule is, only check altered if you genuinely do not know what happened to the original number.

A real-world example is Jamal Washington, who bought a 1969 Camaro shell with a sanded-down dash. He honestly checked altered or removed, and CHP held the car for a 30-day investigation that ultimately cleared the title.

Section 4: Acquisition Information

This block records how you got the vehicle: purchased, built, gifted, or inherited. You list the seller or source, the date of acquisition, and the purchase price. For builds, you write self-constructed and list the date the last major component was installed.

The consequence of leaving this blank is that the DMV cannot calculate use tax under Revenue and Taxation Code § 6275, which delays titling. Builders must list the total cost of all parts, and the California Department of Tax and Fee Administration will assess use tax on that total.

A common misconception is that homemade trailers or kit cars are tax-exempt because no dealer was involved. They are not, and unpaid use tax accrues 10% penalties under R&TC § 6591.

Section 5: Certification and Signature

The owner signs and dates under penalty of perjury per Code of Civil Procedure § 2015.5. Co-owners must each sign. The signature must match the driver license signature, and electronic signatures are not accepted on TR-310 as of 2026.

The consequence of a false statement is a perjury charge under Penal Code § 118, a felony punishable by up to four years in state prison. A common misconception is that I didn’t read it is a defense, but California courts treat the signature as conclusive notice under People v. Viray (2005).

A real-world example is Robert Tanaka, who signed for his brother without authorization and was charged with both perjury and forgery under Penal Code § 470.

Companion Forms You Must File With TR-310

TR-310 rarely travels alone, because the DMV needs a complete picture of ownership, construction, and inspection before it issues a VIN plate. You will almost always file TR-310 alongside a packet of supporting forms, each of which solves a different piece of the puzzle. Missing even one form delays the assigned VIN by weeks and can require a second CHP appointment.

The full packet usually includes REG 343, REG 31, REG 5036 for SPCNS vehicles, REG 4008 for trucks and trailers, REG 256, bills of sale or REG 135, receipts for every major component, and a smog certificate if the vehicle is 1976 or newer and gas-powered.

REG 343: Application for Title or Registration

REG 343 is the master title application. It establishes legal ownership and triggers the issuance of the California Certificate of Title once the assigned VIN is installed. Every TR-310 filer must submit this form, with the VIN line left blank or marked TBD until CHP assigns the number.

The consequence of skipping REG 343 is that you walk away from CHP with a VIN plate but no path to a title. A common misconception is that the assigned VIN automatically generates a title, but the DMV requires REG 343 to start the title file.

REG 5036: Statement of Construction

REG 5036 is mandatory for every specially constructed vehicle and lists every major component by source, year, and price. The DMV uses it to determine the model year of an SPCNS under Vehicle Code § 9565, which controls smog and emissions exemptions.

The consequence of omitting parts is reclassification to a newer model year, which can force an expensive BAR referee inspection under SB 100. A real-world example is Lisa Nakamura, who left her 1965 small-block Chevy off REG 5036 and was reclassified as a 2024 model, requiring full OBD-II compliance she could not meet.

REG 4008 and Weight Documentation

REG 4008 is required for pickups, commercial trucks, and trailers. You declare the unladen and gross vehicle weights, which control commercial registration fees under Vehicle Code § 9400.1.

The consequence of underreporting weight is back-billing plus penalties, which can reach thousands of dollars on a heavy trailer. A common misconception is that home-built trailers under 2,000 pounds are exempt, but they still need a weight certificate from a certified public scale.

Three Real-World Filing Scenarios

Every TR-310 packet looks different, because the underlying vehicle history drives the paperwork. The three scenarios below show the most common patterns and the consequences of each filing path. Each table is a side-by-side view of the filing step and the result it produces.

Scenario 1: Kit-Car Builder (Factory Five Cobra Replica)

Filing Step	Result
Submit TR-310 with SPCNS as make	DMV opens an assigned-VIN file and routes to CHP
Attach REG 5036 listing every part with receipts	Model year fixed at oldest major component (often pre-1976)
Pass BAR referee inspection under SB 100 lottery	Smog exemption granted or emissions retrofit required
CHP rivets assigned VIN plate at appointment	Vehicle becomes legally identifiable
DMV issues title under REG 343	Owner can register, insure, and drive

Scenario 2: Classic-Car Restorer (Frame Swap on a 1967 Mustang)

Restoration Action	DMV Consequence
Replace rusted frame with reproduction frame	Original frame VIN destroyed, TR-310 required
File TR-310 checking destroyed box	CHP schedules verification, no theft investigation
Submit original title with old VIN	DMV cross-links old and new VIN in title history
Pay $23 assigned-VIN plate fee	Plate issued and riveted by CHP
Receive new title showing assigned VIN	Vehicle retains 1967 model year for smog exemption

Scenario 3: Recovered Stolen Vehicle With Ground-Off VIN

Owner Action	Legal Outcome
Report recovery to local police and obtain case number	NCIC clearance documented
File TR-310 checking altered or removed	CHP opens theft-tracing investigation
Provide insurance settlement and salvage title	DMV verifies chain of ownership
CHP confirms vehicle is not stolen and assigns VIN	Plate riveted, title cleared
File REG 343 with branded salvage rebuilt title	Vehicle returns to road with new VIN

Named Examples That Illustrate the Process

Example 1 — Carlos Ramirez and the Home-Built Utility Trailer. Carlos welded a 12-foot landscaping trailer from steel he bought at a scrapyard in Fresno. Because no factory VIN ever existed, he filed TR-310, REG 343, REG 5036, REG 4008, and a REG 135 bill of sale showing his steel and axle receipts. CHP assigned a VIN at his Clovis appointment, and he registered the trailer for $89 in fees plus use tax on his $1,400 in parts.

Example 2 — Aisha Patel and the Restored 1970 Datsun 240Z. Aisha imported a Japanese-market 240Z whose VIN tag had been removed during a previous restoration. She filed TR-310 checking illegible or destroyed, attached the Japanese export certificate, and submitted REG 256 explaining the import history. CHP verified the engine and chassis numbers, assigned a California VIN, and the DMV titled the car as a 1970 model with full smog exemption.

Example 3 — Tyrell Jackson and the Recovered Honda Civic. Tyrell’s 2018 Civic was stolen, stripped, and recovered six months later with the dash VIN cut out. His insurer paid the claim and took salvage title, then sold the shell back to him. He filed TR-310 with police and insurance documents, and after a 21-day CHP investigation, the car received an assigned VIN and a salvage rebuilt brand on the new title under Vehicle Code § 11515.

Mistakes to Avoid When Filing TR-310

Avoiding the most common errors saves weeks of delay and hundreds of dollars in re-inspection fees. The list below covers the seven mistakes that DMV technicians and CHP verifiers see most often.

• Filing TR-310 when the original VIN is merely dirty or painted, which wastes the appointment and forces a repeat visit
• Listing the kit manufacturer instead of SPCNS as the make, which triggers a make/model mismatch with the NHTSA VIN database
• Forgetting REG 5036 on a specially constructed vehicle, which causes the DMV to default the model year to the current year and demands full OBD-II smog
• Underreporting parts cost on REG 5036, which results in CDTFA back-billing plus 10% penalties under R&TC § 6591
• Checking the altered or removed box without police documentation, which extends the CHP investigation by 30 to 90 days
• Skipping the BAR referee appointment for SPCNS smog certification, which leaves the vehicle un-registerable
• Using correction fluid or scratching out errors on the form, which is treated as a tampered document and rejected on sight

Do’s and Don’ts of the TR-310 Process

Following these rules keeps your packet moving and prevents costly re-submissions.

Do’s

• Do call your local CHP office first to confirm whether they require an appointment, because walk-in policies vary by county
• Do photograph every step of the build, since CHP often asks for visual proof of part installation under 13 CCR § 152
• Do keep every receipt for at least three years, because CDTFA can audit use tax under R&TC § 6487
• Do file within 10 days of completion to avoid penalty fees under Vehicle Code § 9554
• Do confirm SB 100 lottery enrollment in January if you want a smog exemption, because the BAR caps SPCNS exemptions at 500 per year

Don’ts

• Don’t stamp or engrave your own VIN, because doing so is a felony under 18 U.S.C. § 511 and CVC § 10750
• Don’t drive the vehicle to the CHP appointment without a moving permit, since unregistered operation is a citable offense
• Don’t list a DBA name as the owner, because the DMV will reject anything other than a legal entity name
• Don’t guess at part years on REG 5036, since errors flow into the model-year determination and smog requirements
• Don’t lose the assigned-VIN plate before CHP installs it, because replacement requires a fresh TR-310 and another $23 fee

Pros and Cons of Pursuing an Assigned VIN

Filing TR-310 is the only legal route for a VIN-less vehicle, but it carries trade-offs worth weighing before you start.

Pros

• Legal road use becomes possible, which is impossible without a recognized VIN
• Insurance carriers will write policies once the assigned VIN appears on the title
• Resale value rises sharply, because buyers avoid VIN-less vehicles
• The SB 100 smog exemption preserves the original character of classic and kit cars
• The assigned VIN is permanent, so the paperwork only happens once

Cons

• The full process can take 60 to 120 days from filing to title issuance
• Use tax on parts can reach 9.5% of total cost depending on county under CDTFA tax rates
• The SB 100 lottery is competitive, with thousands of applicants for 500 slots each year
• CHP appointments can be scheduled months out in busy regions like Los Angeles and the Bay Area
• A salvage rebuilt brand on recovered vehicles permanently lowers resale value

Fees, Timelines, and Where to File

The TR-310 filing fee itself is modest, but the surrounding fees add up. The DMV fee schedule lists the assigned-VIN plate at $23, and the registration, title, weight, and use tax fees vary by vehicle type and county. Plan for a total out-of-pocket cost between $300 and $1,500 for most projects.

You file the packet at any DMV field office, although appointment-only offices process TR-310 faster than walk-in counters. The CHP verification is scheduled separately at a CHP inspection facility, and many counties have dedicated VIN verification windows. Allow 4 to 12 weeks between DMV submission and CHP appointment in 2026, based on current DMV wait-time data.

Use Tax and Fee Breakdown

Use tax is calculated on the total cost of all parts for SPCNS vehicles, and on the purchase price for transferred vehicles. The CDTFA use tax page explains the calculation, and county rates range from 7.25% to 10.75%. The plain-English rule is, expect to pay sales-tax-equivalent on every part receipt.

The consequence of not pre-paying use tax is a CDTFA bill that lands months later with a 10% penalty plus interest. A real-world example is Henry Goldberg, whose $18,000 hot rod build generated a surprise $1,710 use tax bill plus $171 in penalties when he tried to register without disclosing parts cost.

Timeline From Filing to Plate Installation

The typical TR-310 timeline runs four phases: DMV intake (1 to 5 business days), CHP appointment scheduling (4 to 12 weeks), VIN plate manufacture (2 to 4 weeks), and CHP installation appointment (same day as inspection). Total elapsed time from packet submission to drivable, registered vehicle is usually 60 to 120 days.

The consequence of treating any phase as optional is a restart from the beginning. A common misconception is that paying extra speeds the timeline, but California does not offer expedited TR-310 processing.

Federal and State Anti-Tampering Rules

Federal law treats VIN tampering as a serious offense, because VINs are the foundation of vehicle theft prevention nationwide. Under 18 U.S.C. § 511, knowingly removing, obliterating, tampering with, or altering a VIN is a felony punishable by up to five years in federal prison and substantial fines. The companion statute 18 U.S.C. § 553 criminalizes the import and export of vehicles with altered VINs.

California layers state penalties on top of federal law. Vehicle Code § 10750 makes it a misdemeanor to alter or remove a VIN, and § 10751 makes possession of a VIN-altered vehicle a wobbler that prosecutors can charge as a felony. § 10752 authorizes seizure and forfeiture of the vehicle itself.

Court Rulings That Shape Enforcement

In People v. Carter (1976) 19 Cal.3d 412, the California Supreme Court held that mere possession of a vehicle with an altered VIN creates a rebuttable presumption of guilt, putting the burden on the owner to explain the alteration. The plain-English consequence is that buying a car with a sanded-down VIN puts you at legal risk even if you did not do the sanding. The fix is to file TR-310 immediately upon discovery, which converts an illegal vehicle into a legal one with a fresh assigned VIN.

In United States v. Jiminez-Calvillo (9th Cir. 2008), the Ninth Circuit upheld a § 511 conviction even where the defendant claimed the VIN was already altered when he bought the car, because willful blindness satisfies the knowledge element. A real-world consequence is that hobbyists who buy project cars without verifying VINs can face federal charges if the seller turns out to be a chop-shop operator.

A common misconception is that an assigned VIN erases the past. It does not, because law enforcement can still trace the vehicle’s history through the NMVTIS database, and any prior theft remains a separate criminal matter from the assigned-VIN process.

Key Entities Involved in the TR-310 Process

Several agencies and roles intersect on every TR-310 file, and understanding who does what prevents wasted trips and rejected forms.

• California DMV — Issues the assigned VIN, processes TR-310, REG 343, and the title, and collects registration fees through DMV field offices
• California Highway Patrol — Performs the REG 31 verification, investigates altered VINs, and rivets the assigned-VIN plate at a CHP inspection facility
• Bureau of Automotive Repair (BAR) — Runs the SPCNS smog program and the SB 100 lottery, certifying emissions on kit cars and street rods
• California Department of Tax and Fee Administration (CDTFA) — Collects use tax under R&TC § 6275 on parts and purchase price
• National Highway Traffic Safety Administration (NHTSA) — Sets the federal VIN standard at 49 CFR Part 565 and runs the VIN decoder
• National Motor Vehicle Title Information System (NMVTIS) — Maintains the federal title and brand database used to clear assigned-VIN applications
• Local law enforcement — Issues the police report required for altered or removed TR-310 filings on recovered stolen vehicles

FAQs

Do I need a CHP appointment before I file TR-310?

No. You file TR-310 at the DMV first, and the DMV routes the file to CHP for inspection scheduling. Walking into CHP without DMV intake usually results in a turn-away.

Can I drive my vehicle to the CHP inspection without a VIN?

No. You need a DMV moving permit or a tow, because driving an unregistered vehicle on public roads violates Vehicle Code § 4000 and risks impound.

Is TR-310 the same as a VIN verification?

No. A standard VIN verification on REG 31 confirms an existing number, while TR-310 requests a brand-new state-assigned VIN. They serve opposite purposes and use different forms.

Will an assigned VIN affect my smog requirements?

Yes. SPCNS vehicles must pass a BAR referee inspection under SB 100, and the model year on REG 5036 controls which smog rules apply for the life of the vehicle.

Can I file TR-310 online?

No. As of 2026, TR-310 must be submitted in person or by mail to a DMV field office, because CHP must physically inspect and rivet the plate.

Does an assigned VIN lower my vehicle’s value?

Yes. Buyers often discount assigned-VIN vehicles by 10% to 30%, because the title carries a state-assigned number rather than a factory VIN, and salvage-rebuilt brands further reduce value.

Is use tax charged on a home-built trailer?

Yes. CDTFA assesses use tax on the total cost of materials under R&TC § 6275, even when no dealer was involved and no sales tax was paid at purchase.

Can I transfer an assigned VIN to a different vehicle?

No. Assigned VINs are tied to the specific frame or chassis CHP inspected, and moving the plate to another vehicle is a felony under 18 U.S.C. § 511.

Do I need a bill of sale for every part on REG 5036?

Yes. The DMV and CDTFA require receipts or a REG 135 bill of sale for each major component, because part costs drive use tax and model-year determination.

Will my insurance company write a policy on an assigned-VIN vehicle?

Yes. Most carriers insure assigned-VIN vehicles once the title issues, although specialty insurers like Hagerty and Grundy offer better rates for kit cars and classics.

Can I file TR-310 for a vehicle still under a lender’s lien?

No. The legal owner (lienholder) must sign or release the lien first, because TR-310 alters the title record and requires owner consent under Vehicle Code § 5600.

Does an assigned VIN clear a stolen-vehicle history?

No. The vehicle’s prior theft record stays in NCIC and NMVTIS, and the assigned VIN simply gives the recovered vehicle a current legal identifier.