A car bill of sale is a signed document that records the transfer of a vehicle from a seller to a buyer, capturing who was involved, what was sold, the price, and the date. It is not the title. The title is the state-issued proof of ownership; the bill of sale is proof of the transaction that moved the car from one owner to the next. Most states either require one to process a title transfer or treat it as the paperwork that protects both parties if anything goes wrong afterward.
When You Need One
Whether a bill of sale is legally required depends on your state. Some states will not process a title transfer or new registration without one. Others treat it as optional. There is no federal law mandating a bill of sale for private vehicle sales; the requirement is entirely state-driven.
Even where it isn’t required, it’s worth the five minutes. The buyer gets proof of what they paid, which matters for sales tax. The seller gets proof they no longer own the car, which matters if that car later picks up parking tickets or ends up in a wreck.
A few situations make the document especially important:
- Private-party sales, where there is no dealer paperwork to document the transaction.
- Gifted vehicles, where a $0 price still needs to be recorded for registration and tax purposes.
- Sales where the seller still owes money on the car and a lender’s lien has to be cleared.
- Out-of-state purchases, because the destination state’s DMV will almost certainly want a bill of sale to process the paperwork.
What to Put in It
A bill of sale needs enough detail that anyone reading it later, whether a DMV clerk, a tax assessor, or a judge, can reconstruct what happened. At a minimum, include:
- Full names and addresses of both the buyer and the seller.
- Vehicle details: year, make, model, color, and vehicle identification number (VIN).
- Odometer reading at the time of sale.
- Sale price and payment method.
- Date of the sale.
- Condition terms: whether the vehicle is being sold “as-is” or with any warranty.
- Signatures of both parties.
If the title lists more than one owner, pay attention to the word that joins them. Co-owners connected by “and” generally both have to sign the bill of sale and the title assignment. Co-owners connected by “or” can typically complete the sale alone. Getting this wrong can stall the transfer.
Fill out every field. If something doesn’t apply, write “N/A” rather than leaving it blank. A blank line is an invitation for someone to fill it in later, which is exactly what the document exists to prevent.
Odometer Disclosure
Federal law requires the seller to disclose the vehicle’s mileage in writing whenever ownership changes hands. The disclosure must include the reading at the time of transfer, and the seller must sign it and print their name. It is usually made on the title itself, but many states also require or allow it on the bill of sale.
Not every vehicle is subject to the rule. The exemption depends on the model year:
- Vehicles of model year 2010 and older are exempt from odometer disclosure if transferred at least 10 years after the start of the corresponding calendar year. In 2026, all of these vehicles are now exempt.
- Vehicles of model year 2011 and newer are exempt only after 20 years. The first vehicles in this group won’t become exempt until 2031, so any 2011-or-newer car sold in 2026 still requires a mileage disclosure.
Skip the disclosure on a 2011-or-newer vehicle and the buyer may not be able to title the car. The penalties for lying about mileage are steep. Under federal law, a buyer who proves the seller intentionally misrepresented the odometer can recover three times their actual damages or $10,000, whichever is greater, plus attorney’s fees and court costs. The two-year clock for a civil claim starts when the buyer discovers, or should have discovered, the fraud.
What “As-Is” Actually Does
Writing “as-is” on a bill of sale means the seller is not promising the car will work properly after the sale. The buyer accepts the vehicle in its current condition and takes on responsibility for repairs. In a private sale between two individuals, this is the default assumption; private sellers generally don’t provide warranties.
What “as-is” does not do is protect a seller who lies or hides known defects. If you know the transmission is failing and say nothing, the clause won’t save you from a fraud claim. Every state has consumer protection laws that apply to misrepresentations and failures to disclose material defects regardless of any as-is language, and federal odometer law applies no matter what the paperwork says. A handful of states go further and restrict or ban as-is sales of used vehicles, at least from dealers. In states that allow them, a written warranty or service contract offered alongside the sale can override the disclaimer.
Separately, many states require written disclosure of major damage history, salvage titles, or flood damage before a sale is completed. These obligations run alongside the bill of sale, and ignoring them can result in the sale being unwound. If the car has a salvage or rebuilt title, note it on the bill of sale. If you’re buying, check the title brand before you sign.
Selling a Car With a Loan On It
If you still owe money on the vehicle, the lender holds a lien on the title. You can still sell, but the lien has to be satisfied before the buyer gets a clean title. This is where private sales get complicated and where the bill of sale carries real weight.
Start by asking your lender for a payoff amount. That figure is different from your loan balance; it includes interest through a specific date and is only valid for a limited window, typically 10 to 30 days. The cleanest approach is to close the transaction at the lender’s office, or through a direct payment from the buyer to the lender, so the buyer can see the lien released in real time. A third-party escrow service is another option, holding the buyer’s money until a clean title is produced.
The bill of sale should document the lien, name the lender, and spell out the agreed process for paying it off. Buyers, be cautious. Never hand a large sum directly to a seller and trust them to pay off the loan. If they don’t, the lender can still repossess the car, from you.
Gifting a Car
When you give a car to a family member or a friend, you still need a bill of sale. List the purchase price as $0 and note that the transfer is a gift.
Two consequences follow. The DMV will want documentation of how the new owner acquired the vehicle, and the $0 bill of sale provides it. On the tax side, many states calculate sales or use tax on a gifted vehicle based on fair market value rather than the $0 price, though some exempt gifts between immediate family members. The federal gift tax exclusion for 2026 is $19,000 per recipient; a car worth more than that requires the giver to file IRS Form 709, though actual tax usually isn’t owed unless the giver has already burned through their lifetime exemption. The recipient never owes gift tax.
The Sale Price Should Be the Real Price
The purchase price on the bill of sale typically determines the sales or use tax the buyer owes when they register the car. State vehicle sales tax rates range from 0% in a handful of states up to about 8%, with some localities adding surcharges on top.
Buyers and sellers sometimes agree to write a lower number to shrink the tax bill. That’s tax fraud, and states know it happens. Many compare the listed price against book value or a standard presumptive value, and if the number on your paperwork is suspiciously low, the state may assess tax based on fair market value instead and add penalties. Write what was actually paid.
Signatures, Notarization, and Copies
Most state DMV websites offer a downloadable bill of sale form. Using your state’s official version is the easiest way to be sure you’ve covered what the DMV expects. If your state doesn’t provide one, a generic template works as long as it contains the essentials.
Both parties have to sign. Roughly a dozen states also require notarization of the title assignment or the bill of sale itself before the DMV will accept it. Check with your local DMV before the transaction, because discovering the requirement after the seller has left town is a problem you don’t need. Where notarization applies, fees are modest, typically $2 to $15 per signature.
Both parties should keep a copy. The buyer usually needs the original for DMV processing. The seller should hold their copy for at least several years as proof the vehicle is no longer theirs.
File a Release of Liability
A bill of sale on its own may not be enough to stop tickets, tolls, and accident liability from following you after the sale. Many states require or allow sellers to file a separate Notice of Transfer or Release of Liability with the DMV. That filing updates state records to show the vehicle changed hands, which matters if the buyer drags their feet on registering the car in their name.
Until the buyer transfers the title, the state may still list you as the registered owner. A dated release-of-liability filing creates a record that ownership changed on a specific day, so later violations fall on the buyer. Most states let you file online in a few minutes. Do it the same day you hand over the keys.
Pull your license plates off the car before the buyer drives away, too. In many states, plates are tied to the registered owner rather than the vehicle, and leaving them on a sold car means toll charges and camera tickets can still find their way back to you.