Boat Bill of Sale: What It Must Include

The bill of sale is the one document standing between you and a fight you can’t win. If a lien surfaces three months after you hand over $38,000, or the seller claims you bought the boat “running” when the survey said otherwise, the paper in your folder decides who’s right. Most buyers sign a half-page generic form, skip three fields that matter, and never notice until something goes wrong. Here’s exactly what the document needs, why each line protects you, and where the cheap templates leave you exposed.

What a bill of sale actually does for you

A bill of sale is proof of the transaction: who sold what to whom, for how much, on what date, in what condition. It is not the title, and it does not by itself prove the seller owned the boat free and clear — that’s a separate problem covered in the boat title transfer guide. What the bill of sale does is three things that protect a buyer:

It establishes the price you actually paid, which sets your tax basis and caps the seller’s later claims about value.
It records the condition and terms of sale (“as-is,” what was promised, what wasn’t), which is your only defense against a “you broke it / it was fine when I sold it” dispute.
It transfers legal ownership of the physical boat, motor, and trailer as separate items, so a missing engine serial or trailer VIN doesn’t strand you at the DMV or DNR counter.

For a private-party used boat — the riskiest kind of purchase — this document carries more weight than buyers expect. Dealers handle their own paperwork. In a driveway sale between two strangers, the bill of sale and the title are the entire legal record.

The non-negotiable fields

Every one of these belongs on the document. If a field is missing, add it by hand and have both parties initial it. A handwritten addition you both initialed beats a clean form with a gap.

Field	Why it protects you	Common failure if missing
Full legal names + addresses of both parties	Identifies who is liable	Can’t enforce against “Dave from Craigslist”
Hull Identification Number (HIN)	Ties the document to this specific boat	Seller’s HIN ≠ title HIN = registration rejected
Year, make, model, length	Matches title and registration	Mismatch flags fraud or a swapped hull
Outboard/motor make + serial number(s)	Engine is often titled/registered separately	Buy the boat, not the $9k motor on it
Trailer VIN, make, year	Trailer is a separate titled vehicle in most states	Can’t register the trailer; stuck on the lot
Exact sale price (numerals + written out)	Sets tax basis, caps disputes	”Verbal” prices get re-litigated
Date of sale	Starts the clock on registration deadlines	Late-transfer penalties land on you
”As-is, where-is” condition language	Caps seller’s warranty exposure both ways	Ambiguity = courtroom
Lien / encumbrance statement	Seller affirms no money is owed	A bank repossesses your boat
Both signatures (+ notary where required)	Makes it legally binding	Unsigned = unenforceable

A few of these deserve more than a row.

The HIN is the field that catches fraud

The Hull Identification Number is a 12-character code, usually stamped on the upper starboard corner of the transom. It’s the boat’s fingerprint. The single most important verification you can do before signing: read the HIN off the actual transom, then confirm it matches the HIN on the title and the HIN written on the bill of sale. All three must be identical, character for character.

When they don’t match, you’re looking at one of three things: a clerical typo (annoying but fixable before money changes hands), a re-stamped hull (a boat rebuilt from a wreck or a different vessel entirely), or a stolen boat with a swapped plate. A $200 HIN history check is cheap next to a $40,000 loss when the real owner shows up. If the seller resists letting you photograph the transom HIN, treat that as a hard stop and walk.

Lien language is what keeps the boat yours

Here’s the failure that ruins buyers: you pay cash, take the boat, and four months later a finance company calls because the seller never paid off their loan. In most states the lender’s security interest follows the boat, not the seller. You can lose the boat and still be out the cash.

The bill of sale must contain an explicit seller affirmation, in plain words: “Seller warrants the vessel, motor, and trailer are free of all liens, loans, and encumbrances, and seller will indemnify buyer against any that arise.” That sentence does two jobs. It forces an honest seller to disclose a payoff (so you can pay the lienholder directly and get a release), and it gives you a written claim against a dishonest one. Pair it with a title check at the state agency before funds move — the affirmation is your backstop, not your only check.

”As-is” cuts both ways — get the condition in writing

Almost every private used-boat sale is “as-is, where-is, no warranties.” That’s normal and fair: the seller isn’t a dealer and can’t stand behind a 14-year-old powertrain. But “as-is” doesn’t erase what the seller told you. If the listing or conversation made specific factual claims — “engine has 320 hours,” “no soft spots in the deck,” “winterized every year” — write those into the bill of sale or an attached condition addendum.

The distinction that matters in a dispute: “as-is” protects a seller from claims about problems neither party knew about. It does not protect a seller from misrepresentation — stating something false that you relied on. A written engine-hour figure on the bill of sale turns “he told me 320” into a documented term. If a survey later reads 900 hours on a meter that was clearly reset, you have leverage. Without the written figure, it’s your word against theirs.

Before you ever get to signing, run the listing through a verdict so you know what to write down and what to push on — paste the listing and get an instant verdict on price, red flags, and the specific items worth nailing into the condition language.

State rules: notary, separate trailer title, and the “as buyer” trap

Requirements vary by state, and getting these wrong delays or voids the transfer:

Notarization. Some states require the seller’s signature on the bill of sale or title to be notarized (Louisiana, West Virginia, and others; rules change — confirm with your state agency). A few require it for boats above a length or value threshold. When in doubt, both parties signing in front of a notary costs about $10 and removes any question.
Separate trailer title. In most states the trailer is its own titled vehicle. List the trailer VIN separately and confirm the seller hands you a signed trailer title, not just a registration card. Buyers routinely leave with the boat and no way to legally register the trailer.
Tax basis. The price on the bill of sale is what you’ll pay use/sales tax on at registration. Wildly under-reporting to dodge tax can void the document and invites an audit — and it lowers your basis if you later sell. Write the real number.
The “as buyer” trap. Sign as the buyer, but only after the HIN, title, and lien checks clear. Once you sign and pay, undoing the deal means suing. Verification happens before the pen touches paper.

Pre-signing checklist

Walk through this before you sign anything or move money:

Frequently asked questions

Is a bill of sale enough, or do I also need the title?

You need both, and they do different jobs. The bill of sale records the transaction and condition; the title proves the seller’s ownership and lets you register the boat in your name. A bill of sale without a clean, signed title leaves you unable to register — and possibly holding a boat the seller didn’t fully own. See the boat title transfer guide for the handoff.

Does the bill of sale need to be notarized?

It depends on your state. Several require notarization of the seller’s signature on the bill of sale or title; most do not. Because rules change and vary by boat length and value, confirm with your state’s boating or motor-vehicle agency before the sale. When unsure, signing in front of a notary costs about $10 and eliminates the risk of a rejected transfer.

What if the seller refuses to put the engine hours or condition in writing?

Treat reluctance as information. An honest seller who said “320 hours” has no reason to refuse writing “320 hours” on the document. Refusal usually means the verbal claim won’t survive scrutiny. Either get the figure in writing or assume it’s unverified, lower your offer accordingly, and budget for what a survey might reveal.

Can a handwritten bill of sale hold up?

Yes. A handwritten bill of sale is legally valid as long as it contains the required elements — both parties’ names, the boat’s identifying details, the HIN, the price, the date, “as-is” and lien language, and both signatures. Neatness isn’t the issue; completeness is. A handwritten document with every field beats a printed template missing the HIN or lien clause.