The short version
Treat the bill of sale as the memory of the transaction, because in six months it will be the only one anybody trusts. Put the VIN from the car, the mileage from the dash, the price you actually paid, the as-is line, and every promise the seller made above two signatures, on the state form if your DMV publishes one. It will not transfer ownership — only the title does that — but it settles every argument the title cannot, and it takes five minutes to get right.
A bill of sale is the receipt for a car. One page, two signatures, and the handful of facts the two of you agreed on the day money changed hands: who sold what to whom, for how much, with how many miles on it, and on what terms. It is the paper people most often skip, because the title feels like the real document and the cash feels like the real proof.
Then something goes wrong. The seller says the price was higher, the DMV asks what you paid, a toll camera bills the old owner for a car he no longer has, or the "new transmission" turns out to have been a promise nobody wrote down. Each of those is settled in thirty seconds by a bill of sale and argued for months without one.
What a bill of sale is — and what it is not
A bill of sale records a transaction: on a certain date, a certain person sold a certain vehicle to a certain other person for a certain amount, in a certain condition. Both sides sign it, both keep a copy, and either one can produce it later when the other side's memory drifts. That is its whole job.
What it is not is a title. Ownership of a car in the US moves when the title is signed over and the new owner registers it with the state — a bill of sale on its own does not put the car in your name, and no DMV treats it as a substitute for a title the seller "lost" or "never got around to." A seller with a bill of sale and no title is not selling you a car; they are selling you a dispute. The title side is the private-sale title transfer checklist — this guide is only about the receipt that goes with it.
It protects both parties. For the buyer it proves the price (which usually sets the sales tax the DMV assesses at registration), the mileage claimed, and any promises made. For the seller it proves the moment the car stopped being theirs — the date that separates their toll bills and accidents from yours.
The fields, line by line
There is no single national form. A handwritten page with the right facts is a valid bill of sale almost everywhere; a template from your DMV site is better only because it prompts for the lines people forget. Whatever you use, it should carry:
- Full legal names and addresses of buyer and seller — copied from the IDs you looked at, and the seller's name must match the name on the title
- Year, make, model, body style, and color
- The full 17-character VIN, read off the car itself (dash plate and door-jamb sticker) and checked against the title — never copied from the listing
- License plate number, if the plates stay with the car in your state
- Odometer reading on the day of sale, and whether it is the actual mileage
- Sale price in dollars, written in numbers and words, and how it was paid (cash, cashier's check, bank transfer)
- The condition: "sold as-is, with no warranty expressed or implied," plus any specific promise or known defect written out in plain words
- Date of sale, followed by both signatures and printed names
The VIN and odometer lines: where the document earns its keep
Two lines carry most of the legal weight. The VIN ties the paper to one physical car, and the only way to be sure the paper describes the car in front of you is to read the VIN off the car and compare every character to the title before you write it down. A single transposed digit turns your receipt into a description of a different vehicle.
The odometer line is a mileage claim with a signature under it. On most vehicles, federal rules already require the seller to disclose the mileage in writing at transfer — usually on the title itself or a separate odometer disclosure statement — and the bill of sale should repeat the same number. Write the reading on the dash at the handshake, not the figure from the ad. If the seller wants to mark it "not actual" or "true mileage unknown," the car's price and its future title carry that brand — decide whether you still want it before you sign.
As-is, and the promises that survive it
Nearly every private sale is as-is by default, and the as-is line simply says so out loud: the buyer accepts the car in its present condition, and the seller is not promising repairs or refunds. What as-is means and where its limits are is its own subject — the short version is that it disclaims warranties, not honesty. A seller who knew the frame was bent and said it was fine has not been rescued by two words on a form.
That is exactly why the bill of sale is also where a promise should live. "Seller states the timing belt was replaced last spring." "Seller states the vehicle has never been in a collision." "Seller states there is no lien." A verbal claim is worth nothing once the seller's memory changes; a signed one is a statement a small-claims judge can read. An honest seller has no reason to object to writing down what they already told you, and one who goes quiet when you pick up the pen has just retracted the claim.
Record the money the same way: a deposit and the balance listed separately, with dates. A token price on a car that plainly sold for real money invites questions at registration, because the state uses the stated price to figure sales tax.
Why some states have their own form
States treat the bill of sale differently, and the rules change, so check your DMV's website before the meeting rather than after. Some states do not require one and register the car on the signed title alone. Some require one for every private transfer. And some publish a specific state form and expect that form, not a homemade page, because it captures the exact fields their tax and title systems need.
A few states go further and want the document notarized, or the seller's signature on the title witnessed by a notary. There, bring the paperwork unsigned and sign in front of the notary — a bank branch usually has one — because discovering the requirement afterward means tracking down a seller who has already been paid. Your DMV's page on the subject should answer these:
- Does the state require a bill of sale for a private sale, or only accept one?
- Is there an official state form, and is it mandatory or just recommended?
- Does the bill of sale, the title, or both need to be notarized?
- Is the odometer disclosure on the title, on a separate statement, or expected on the bill of sale as well?
- Does the state want a gift affidavit or family-transfer form instead of a stated price when no money changed hands?
At the handshake: filling it out so it holds up
Before you meet, do the homework the paper cannot do for you — the seller's story, the photos, and the VIN's public records are all checkable in advance, and a free listing check on the ad is a reasonable first pass. Then, at the car, fill in the form together and follow a few rules that cost nothing:
- Make two originals, not one original and a promise to send a copy — both parties sign both, each keeps one
- Fill in every line before anyone signs; a blank field on a signed document is an invitation to fill it in later
- Compare the seller's ID to the name on the title and to the name on the form — all three should match
- Write the odometer reading after looking at the dash, not before, and have the seller initial it
- Photograph the signed page, the title front and back, and the seller's ID before the paper leaves your hands
- Never sign a bill of sale for a car you have not seen, and never accept one in place of a title
- Keep your copy with the title paperwork until the registration is in your name, and then for as long as you own the car