A bill of sale is a written record of a private sale of personal property, signed by both the buyer and the seller, that proves the transaction happened and spells out its terms. It shows who sold what to whom, for how much, and on what date, and it becomes the paper trail behind registration, sales tax, insurance claims, and any dispute that surfaces later. Under the Uniform Commercial Code adopted in every state, sales of goods worth $500 or more generally need to be in writing to be enforceable, and a bill of sale fills that role.1Legal Information Institute. UCC 2-201 Formal Requirements Statute of Frauds
Bill of Sale vs. Title
These two documents get confused constantly, and the difference matters. A title is a government-issued certificate that names the legal owner of something like a car or a boat. A bill of sale is a record of the transaction itself: what was sold, for how much, and when.
The bill of sale is the receipt. The title is the deed. In a used-car purchase from a private seller, you need both. The seller signs the title over to transfer legal ownership, and the bill of sale documents the details of the deal. Your state motor vehicle agency uses the two together to register the vehicle in your name. Some states will not process the transfer without a bill of sale; conversely, no bill of sale gets a vehicle registered if the title never gets signed over.
When You Need One
A bill of sale is worth having any time personal property of real value changes hands. The most common setting is a private-party vehicle sale, but it is far from the only one.
- Vehicles. Nearly every state DMV expects a bill of sale when registering a car bought from a private seller. It establishes the purchase price, which the state uses to calculate sales tax.
- Aircraft. The FAA requires a specific federal form, AC Form 8050-2, to document an aircraft sale, and the chain of ownership from the last registered owner to the new buyer has to be complete.2Federal Aviation Administration. Aircraft Bill of Sale
- Documented vessels. For boats documented with the U.S. Coast Guard, an unfiled bill of sale is invalid against anyone except the seller or someone who already knew about the sale. Skip the filing and a third party with a competing claim can take priority over you.3United States Coast Guard. CG-1340 Bill of Sale
- Livestock and animals. For horses, cattle, and other high-value animals, a bill of sale establishes ownership and often includes health guarantees or breeding rights.
- Equipment and general personal property. Large tools, machinery, furniture, and electronics all benefit from a bill of sale, especially for insurance claims or resale.
Even when nothing legally requires one, both sides come out ahead with a signed document. Sellers can point to it to prove they no longer owned an item that later ends up in an accident or a lien dispute. Buyers can prove they paid, when they paid, and what condition was promised.
What to Put in It
A bill of sale doesn’t need to be long, but it does need to be specific. Vague descriptions are exactly what create trouble later. Every one should contain:
- Full legal names and addresses of the buyer and seller.
- A detailed description of the item. For a vehicle: year, make, model, color, and VIN. For equipment: serial numbers. For animals: breed, age, and distinguishing markings. The item has to be unmistakable.
- Purchase price and payment method. The exact dollar amount and how it was paid.
- Date of the transaction. This is when ownership and liability shift.
- Condition terms. Any warranties, or “as-is.”
- Signatures of both parties.
Templates are available through state motor vehicle agencies and countless online sources. A handwritten bill of sale is perfectly valid as long as it has the necessary information and both parties sign.
What “As-Is” Actually Means
You will see “as-is” language on most private-party bills of sale, and it carries real legal weight. When a seller includes an as-is clause, they are telling the buyer: this is the condition, and I am not guaranteeing anything about it. The buyer takes on the responsibility for inspecting the item and accepting whatever they find.
An as-is clause effectively eliminates the seller’s obligation to fix defects discovered after the sale. Buy a car as-is and the transmission fails a week later, and you generally have no legal claim against the seller for the repair. That is why the clause matters so much in vehicle sales, where hidden mechanical problems are common. Buyers should treat an as-is sale as a strong reason to get an independent inspection first. Sellers should include the clause to shut down claims that surface after the deal closes.
Odometer Disclosure for Vehicles
Federal law layers an extra requirement on top of the standard bill of sale for cars. Anyone transferring ownership of a motor vehicle must give the buyer a written odometer disclosure showing the mileage at the time of transfer, and must disclose if the true mileage is unknown.4Office of the Law Revision Counsel. 49 USC 32705 – Disclosure Requirements on Odometer Mileage When Motor Vehicles Are Transferred The statement must include the odometer reading, the transfer date, both parties’ names and addresses, and the vehicle’s make, model, year, and VIN.5eCFR. 49 CFR Part 580 – Odometer Disclosure Requirements
In most states the odometer statement is printed directly on the title, and some sellers also put it on the bill of sale for extra documentation. There are exemptions: vehicles rated over 16,000 pounds gross weight, non-self-propelled vehicles, and older models past a set age threshold.5eCFR. 49 CFR Part 580 – Odometer Disclosure Requirements
Signatures, Witnesses, and Notarization
Both parties need to sign for the bill of sale to carry legal weight. Signatures confirm agreement and that the transaction happened. Use ink or a verifiable digital signature, never pencil.
Whether you need a witness or a notary depends on what you are selling and where you live. For most personal property sales, signatures alone are enough. Vehicle title transfers are the main exception. Roughly a dozen states require the seller’s signature on the title to be notarized before the DMV will process the transfer, and a few of those also require the buyer’s signature to be notarized. If your state requires notarization and you skip it, the transfer will not go through. Notary fees for a simple signature authentication are modest, typically ranging from a few dollars to around $25.
For high-value items like aircraft, the FAA requires signatures in ink or by digital signature on AC Form 8050-2, with everything else typed or printed.6Federal Aviation Administration. AC Form 8050-2 Aircraft Bill of Sale Even where notarization isn’t required, it adds a verification layer that can matter if the document is ever challenged. For anything worth more than a few thousand dollars, notarizing is cheap insurance.
Tax Consequences
A bill of sale is also a tax document, and treating it as a casual receipt can create problems with your state revenue agency and the IRS.
Sales Tax
Most states charge sales tax on private-party vehicle sales, and the bill of sale is how they calculate it. The purchase price on the document is the figure the DMV uses. Understating the price to reduce the tax is fraud, and many states cross-check the stated number against fair market value. Suspicious numbers get flagged or reassessed.
For buyers who itemize, state and local sales tax on major purchases can be deducted on Schedule A of Form 1040, either as actual expenses or through the IRS’s optional sales tax tables.7Internal Revenue Service. Topic No. 503, Deductible Taxes The bill of sale is what proves the purchase price and the tax paid.
Cash Transactions Over $10,000
A seller who receives more than $10,000 in cash for a single transaction, or related transactions, has to file IRS Form 8300 within 15 days.8Internal Revenue Service. Form 8300 and Reporting Cash Payments of Over $10,000 “Cash” here covers currency plus cashier’s checks, bank drafts, traveler’s checks, and money orders with a face amount of $10,000 or less.9Internal Revenue Service. Understand How to Report Large Cash Transactions Related payments are aggregated, so splitting a $12,000 car payment into two $6,000 installments within 24 hours still triggers the requirement.
Gifts
Even when property is transferred for no money, a bill of sale documents the gift and its estimated value. If the fair market value exceeds the annual gift tax exclusion, which is $19,000 per recipient for 2026, the giver may need to file a gift tax return.10Internal Revenue Service. Gifts and Inheritances The bill of sale then documents the transfer date and value.
What a Bill of Sale Cannot Do
The document only protects you if the person signing it actually has the right to sell the property. Two common scams in used-vehicle sales can turn a signed bill of sale into a worthless piece of paper.
Title jumping. Someone buys a vehicle and resells it without ever registering the title in their own name. They sign the title over to you directly from the previous owner, skipping their own registration to avoid sales tax and transfer fees. It is illegal in all 50 states, and the broken chain of ownership can delay or block your registration at the DMV. Any liens on the middleman can also attach to the vehicle. Red flag: the name on the title does not match the seller’s ID, and the seller has a story about selling it for a friend or relative.
Curbstoning. An unlicensed dealer poses as a private seller, listing cars on classifieds or moving them out of parking lots. Because they operate outside dealer licensing, they offer no warranties, are not bound by lemon laws, and have every reason to hide known problems. Vehicles from curbstoners often carry salvage histories, flood damage, rolled-back odometers, or unreported accidents. Run the VIN through the National Motor Vehicle Title Information System, check the seller’s ID against the title, and walk if anything doesn’t line up. A properly completed bill of sale with the seller’s real name and address at least gives you a starting point for legal action.
How Long to Keep It
Both parties should keep an original signed copy. The buyer’s copy sees the most use: vehicle registration, insurance claims, warranty disputes, tax records. Store it with the title and any related documents like inspection reports or odometer disclosures.
For tax purposes, the IRS generally expects supporting documents to be retained for at least three years from the date you filed the return that used them.11Internal Revenue Service. Topic No. 305, Recordkeeping For property that establishes a cost basis, like a vehicle you later sell or business equipment you depreciate, keep the bill of sale for as long as you own the asset plus at least three years after you dispose of it. Sellers should hold onto their copy for at least three years too. If a liability claim shows up after the sale, that copy is the evidence that ownership transferred on a specific date.