Do you need a bill of sale? Sometimes the law requires one, often it’s a smart idea even when it isn’t required, and occasionally you can skip it without much risk. For private vehicle and boat sales, many states require a bill of sale as part of the title transfer. For valuable personal property, it’s strongly recommended because it’s often your only written proof the sale happened. For small, casual sales, it’s optional.
The short version: if the item has a government-issued title, expect to need one. If the item is worth $500 or more, write one anyway. If it’s a $40 bookshelf off a curb, don’t bother.
When a Bill of Sale Is Legally Required
State rules are less uniform than most people assume. Some states require a bill of sale for every private vehicle transaction. Others only require one when the certificate of title doesn’t include a space for the purchase price, or when the vehicle predates title requirements. A handful don’t require a bill of sale at all if the title is properly signed over.
The most common situations where states mandate a bill of sale:
- Private vehicle sales, where the buyer presents the bill of sale alongside the signed title when applying for a new title and registration.
- Vessel and boat transfers, which frequently require a bill of sale as part of the titling process.
- Homemade, kit, trailer, or older vehicles that predate title requirements, where the bill of sale serves as the primary purchase document because no prior title exists.
There’s also an indirect way the DMV can require one. Even in states that don’t technically demand a bill of sale, the office may ask for one if the purchase price on your title application looks unusually low. The sale price affects sales and use tax, so an implausibly low number is a red flag. Some states will assess tax based on fair market value instead.
When You Don’t Legally Need One but Should Write One Anyway
For private sales of valuable personal property, a bill of sale is worth the five minutes it takes to write, even when no law demands it. Expensive electronics, jewelry, equipment, livestock, collectibles — a signed bill of sale eliminates the “your word against mine” problem later.
The $500 UCC Rule
There’s a specific legal reason to put any significant sale in writing. Under the Uniform Commercial Code’s Statute of Frauds, a contract for the sale of goods priced at $500 or more generally isn’t enforceable unless there’s a signed writing indicating a sale was made.1Legal Information Institute. UCC 2-201 – Formal Requirements; Statute of Frauds Most states have adopted some version of this rule. A bill of sale satisfies the writing requirement, so if a buyer refuses to pay or a seller tries to reclaim the item, you have an enforceable record.
Private Firearm Transfers
Federal law does not require a bill of sale or record-keeping for private sales between two unlicensed individuals in the same state. Roughly half of states now require private firearm transfers to go through a licensed dealer, who handles the paperwork and background check. In states that don’t mandate dealer involvement, a bill of sale is one of the few ways to document that you legally sold the firearm and no longer possess it. Record the buyer’s name and the firearm’s make, model, caliber, and serial number. If that gun later turns up at a crime scene, the document protects you.
Gifts
When property changes hands as a gift rather than a sale, a bill of sale (sometimes called a gift letter or gift affidavit) still matters. For vehicles, most states require documentation showing the transfer was a genuine gift before they’ll waive sales tax on the title transfer. For valuable personal property, a written record can also matter at tax time. The IRS allows you to give up to $19,000 per recipient in 2026 without triggering any gift tax reporting requirement.2Internal Revenue Service. Gifts and Inheritances 1 Gifts above that threshold don’t necessarily owe tax, but they do require a gift tax return, and a written record helps substantiate what happened.
What a Bill of Sale Does Not Do
One point worth being clear about, because it trips people up: a bill of sale is not proof of ownership for a titled vehicle. The certificate of title is. A bill of sale is a private receipt between buyer and seller that records the transaction; the title is the government-issued document naming the legal owner. Some state DMVs say this explicitly: a bill of sale cannot substitute for a certificate of title when the law requires one. Its role is to document the purchase so you can apply for a new title in your name.
For untitled property — furniture, tools, jewelry, electronics — the calculus flips. Nobody issues a government certificate for a riding mower or a diamond ring. In those cases, a bill of sale signed by the seller may be your only written evidence that you bought it. That matters if the item is stolen and recovered by police, if someone else claims it, or if you file an insurance claim.
What to Include If You Write One
A bill of sale doesn’t need to be fancy, but it does need to be specific enough that a stranger reading it could identify exactly what was sold, by whom, and for how much. At minimum:
- Full legal names and addresses of the buyer and seller.
- Detailed description of the item. For a vehicle, that means make, model, year, color, VIN, and odometer reading. For other property, include serial numbers, brand names, or identifying features.
- Sale price and how it was paid.
- Date of the transaction.
- Signatures of both parties.
A few states require the signatures on a vehicle bill of sale to be notarized. Notary fees for this type of document typically run between $2 and $25. Even where notarization isn’t required, it adds a layer of legitimacy that helps if the document is ever challenged.
A handwritten document on notebook paper works as long as it includes the essential details and both signatures. Completeness and accuracy matter, not presentation.
What to Do If You Don’t Have One
Plenty of people find themselves on the other side of this question: they already bought something and never got a bill of sale, or they lost it. What happens next depends on the property.
Vehicles
If the seller properly signed the title over to you, many states will still process the transfer without a separate bill of sale, though you may pay tax on the vehicle’s market value rather than a lower purchase price. Contacting the seller to sign a new bill of sale is worth trying.
If you have neither a title nor a bill of sale, most states offer a bonded title process. You purchase a surety bond (typically 1.5 to 2 times the vehicle’s market value) and submit an application explaining how you obtained the vehicle and why you lack documentation. The bond stays active for several years, protecting anyone who might come forward claiming they actually own the vehicle. If no one does, the bond expires and you end up with a clean title. The bond premium is usually a small percentage of the face value, so for a $10,000 vehicle you might pay $100 to $200.
Personal Property
Without a bill of sale for untitled property, you’ll rely on whatever evidence you can gather: bank or credit card statements showing the payment, text messages or emails discussing the sale, photos of you with the item, or testimony from witnesses. None carries the same weight as a signed bill of sale, but together they can establish a reasonable claim.
Mistakes That Make a Bill of Sale Worthless
A poorly executed bill of sale can be almost as bad as none at all. The errors that cause the most problems are predictable:
- Listing a false sale price. Writing “$1” on a $15,000 car to dodge sales tax is fraud, and many states will assess tax on fair market value if the listed price looks implausible.
- Incomplete vehicle descriptions. “Blue truck” without a VIN, year, or make is nearly useless. The VIN is the single most important identifier because it’s unique to that specific vehicle.
- Missing signatures. An unsigned bill of sale is just paper. Both parties need to sign, and in states requiring notarization, an unnotarized document won’t be accepted.
- No date. The date establishes when ownership transferred, which matters for liability, taxes, and registration deadlines. A missing date creates ambiguity that hurts both sides.