One rig, two (sometimes three) vehicles on paper
The most common paperwork mistake in boat sales is a single receipt that says "boat and trailer, $8,500." Months later the buyer is standing at the DMV trying to register a trailer with a document that does not show the trailer's VIN or its own price, while the boat side of the deal sits at a different agency entirely.
In most states:
- The boat is identified by its HIN (hull identification number, on the transom's starboard side) and is registered or titled with the state's boating, wildlife or natural-resources agency.
- The trailer is identified by its VIN (plate on the tongue or frame) and is registered with the DMV, with its own title in the states that title trailers.
- The outboard motor has its own serial number, and a few states title or register outboards separately. Elsewhere it rides along on the boat's paperwork.
Separate documents are not bureaucratic decoration: each office processes only its own vehicle, taxes only its own price, and wants an ID number that matches its own records.
The package sale, step by step
- Collect the three ID numbers. HIN from the transom, motor serial from the powerhead or mounting bracket, trailer VIN from the tongue plate. Copy them exactly.
- Split the price realistically. Decide what portion of the package price belongs to the boat (with motor) and what belongs to the trailer, for example $7,000 boat and motor, $1,500 trailer. Each registration office calculates sales tax from the price on its document, so keep the split honest and consistent on both papers.
- Write two bills of sale. One for the boat (and motor, with its serial number listed), one for the trailer. Same buyer, same seller, same date, each with its own description, ID number, price and signatures. Our boat generator and trailer generator each produce a two-copy, signature-ready PDF.
- Sign over whatever titles exist. Boat title where boats are titled, trailer title where trailers are titled, motor title in the few states that title outboards. No title? The bill of sale is the ownership record; note "no title issued" on it.
- Buyer: register each piece with its own agency. Boat with the boating agency, trailer with the DMV, each with the matching bill of sale. Deadlines are commonly 15 to 60 days; check your state.
- Seller: keep both copies. Until the buyer re-registers, tickets and tolls follow the old owner. Two signed, dated documents are your shield for both vehicles.
General guidance, last reviewed October 2026. Registration and titling rules vary by state; confirm with your DMV and boating agency.
Who registers what
| Piece | ID number | Typical agency | Document |
|---|---|---|---|
| Boat | HIN (transom, starboard) | Boating / wildlife / DNR agency | Boat bill of sale + title where issued |
| Outboard motor | Serial number | Usually rides with the boat; separately titled in a few states | Listed on the boat's bill of sale (own document where titled) |
| Trailer | VIN (tongue or frame plate) | DMV | Trailer bill of sale + title where issued |
Generate the boat document here, then run the trailer generator for the second document. Two minutes each.
Boat and trailer sales: FAQ
Can one bill of sale cover both?
Two separate documents is the clean way: the agencies are different, the ID numbers are different, and
each office wants its own price for tax. If you insist on one document, it must itemize each piece with
its own ID and price, and some DMV counters will still ask for a separate trailer document.
How should I split the price?
Realistically. A rule of thumb for a used package is that the trailer is worth roughly 10 to 25 percent
of the rig depending on age and type. Write the split on the documents and keep it consistent; a $1
trailer on paper invites questions at the counter and can backfire on the buyer's tax.
The trailer has no title. Is that a problem?
Often not: many states do not title utility and boat trailers at all, especially lighter ones. There the
bill of sale is the ownership record. See our state-by-state
trailer title guide to check how your state handles it.
Does the motor need its own document?
In a few states outboard motors are titled or registered separately and need their own document with the
serial number. In most states listing the motor and its serial on the boat's bill of sale is standard
practice.
What about selling just the trailer, or just the boat?
Then it is a normal single-vehicle sale: one bill of sale for the piece being sold, with its own ID
number. Use the trailer generator or the
boat generator directly.
Related guides
Boat Bill of Sale Boat Motor Bill of Sale Trailer Bill of Sale Trailer Title Requirements by State