California trailer — quick answer
An ordinary California trailer goes onto the Permanent Trailer Identification programme, which is not an annual registration at all. The plate stays with the trailer for good, nobody weighs it — the owner simply certifies the unladen weight — and the only recurring obligation lands once every five years.
How trailer sales actually work in California
- Programme
- Permanent Trailer Identification (PTI) — all trailers except trailer coaches and park trailers
- Unladen weight
- Certified by the owner, lessee or selling dealer on REG 397 or REG 256 — no weight certificate required
- What the original fee buys
- A standard PTI plate and an identification certificate
- The plate
- Stays with the trailer permanently once issued
- Annual registration
- None — PTI trailers are not subject to it
- Every five years
- Either a maintenance service fee or a Planned Non-Operation certification, to keep the PTI record on file
Transferring a trailer in California, step by step
- Certify the unladen weight on REG 397 or REG 256. California takes the owner's or dealer's word for it rather than demanding a weigh slip.
- Pay the original fee to enter PTI, which issues the plate and the identification certificate together.
- Record the PTI plate number on the bill of sale alongside the identification number, since that plate travels with the trailer rather than the owner.
- Find out where the trailer sits in its five-year cycle before buying, then either pay the maintenance service fee or file a Planned Non-Operation certification when it falls due.
What private buyers get wrong here
- No annual renewal means no annual reminder. A PTI record can quietly lapse if the five-year service fee is missed, and a buyer inherits that.
- Planned Non-Operation is the cheaper option for a trailer that is not being used, but it has to be filed — it is not what happens by default.
- Trailer coaches and park trailers are excluded from PTI entirely, so a large towable RV does not belong on this route.
Verified 2026-09-25 against California DMV — Chapter 14, Permanent Trailer Identification (PTI) and California DMV — 14.015 Original Registrations and California DMV — 14.010 Maintenance Service Fee or PNO Every Five Years . Rules change — confirm before you sign.
Is a trailer bill of sale required in California?
An ordinary California trailer goes onto the Permanent Trailer Identification programme, which is not an annual registration at all. The plate stays with the trailer for good, nobody weighs it — the owner simply certifies the unladen weight — and the only recurring obligation lands once every five years.
Does a California trailer bill of sale need to be notarized?
Check the instructions for the specific title and bill-of-sale form. A requirement to notarize a title assignment does not automatically mean the separate bill of sale needs notarization. If notarization is required, wait to sign until the notary instructs you.
What to include on a California trailer bill of sale
- Buyer and seller names and addresses
- Year, make, and trailer type
- VIN or serial number
- Length, number of axles, and empty weight
- Price, date, and signatures
Official sources
- California DMV — Chapter 14, Permanent Trailer Identification (PTI)
- California DMV — 14.015 Original Registrations
- California DMV — 14.010 Maintenance Service Fee or PNO Every Five Years
Requirements change and can vary by county. Confirm with the California DMV before you sign. Not legal advice.
California Trailer Bill of Sale — FAQ
Is a trailer bill of sale required in California?
An ordinary California trailer goes onto the Permanent Trailer Identification programme, which is not an annual registration at all. The plate stays with the trailer for good, nobody weighs it — the owner simply certifies the unladen weight — and the only recurring obligation lands once every five years.
Does a California trailer bill of sale need to be notarized?
Check the signing requirements for the specific title and bill-of-sale form. Notarization of a title assignment and notarization of a bill of sale are separate questions; a car rule does not establish the rule for this item.
Do I need to title a trailer?
It depends on the trailer’s weight and your state. Heavier trailers usually require a title and registration; many small utility trailers only need registration. Check your state page.
What if my trailer has no VIN?
Homemade or older trailers may need a state inspection to be assigned a VIN before they can be titled. The bill of sale still documents the sale in the meantime.
Is a bill of sale proof of ownership?
Generally no. For titled property like a car or boat, the title is what proves ownership. A bill of sale proves that a sale happened and records the price, date, and terms — it supports the title transfer but does not replace it. For untitled property (furniture, equipment, electronics), the signed bill of sale is usually the main proof of ownership.