A semi truck bill of sale is the signed document that records the sale of a commercial tractor from one party to the other, naming the buyer and seller, identifying the vehicle, and fixing the price and date. It works as both a receipt and a contract. For a Class 8 tractor, it also has to carry enough detail to clear the hurdles a passenger-car sale never faces: lien releases, a stamped IRS Schedule 1, state sales tax, and in many cases a notary’s seal. Get the document right and the title transfer takes an afternoon. Get it wrong and you can inherit someone else’s loan, someone else’s tax bill, or a truck you cannot legally register.
What the Document Must Contain
At a minimum, the bill of sale identifies both parties by full legal name and address and describes the vehicle in enough detail to distinguish it from any other. For a semi, that means more than year, make, and model. Record the full seventeen-character VIN from the dashboard plate or the driver’s side door frame, the Gross Vehicle Weight Rating, the number of axles, and the body type. Those details drive how the truck is classified for registration, for the Heavy Vehicle Use Tax, and for federal highway rules. An incorrect GVWR can hold up IRP plates and the HVUT filing both.
The financial terms need to be explicit: total purchase price, date of sale, and method of payment. If the buyer is paying in installments, write out the schedule. Vague wording here is what disputes grow out of later. Some states also want the document to indicate whether the vehicle was a gift or a trade, because that changes how sales tax is calculated.
If the seller is a business, the person signing should have authority to act for the entity, and the document should state their title: owner, managing member, authorized agent. Where the form has a line for a witness, use it.
Check for Liens Before You Pay
Semi trucks are expensive, and many of them carry outstanding loans. If you buy one with an active lien, the lender can repossess the truck no matter what you paid the seller. This is the single fastest way to lose money on a commercial vehicle purchase.
Before any money changes hands, run a lien search. Commercial-vehicle liens are typically filed as UCC records with the Secretary of State where the seller is organized or located, and most Secretary of State offices have free online UCC search tools indexed by debtor name. A paper title should also show any lien on its face, but UCC filings can exist separately, particularly when the truck was financed through a commercial lender rather than a dealership.
If a lien exists, the seller needs to deliver a written lien release from the lender before closing. In practice the seller often uses part of the purchase price to pay off the balance, and the lender then issues the release. A verbal promise that the lien “will be taken care of” is not acceptable. Get the release in writing and confirm it with the lender yourself.
As-Is Sales and What the Buyer Gives Up
Most private semi sales close as-is, meaning the buyer accepts the truck in its current condition with no guarantees from the seller. Once you sign an as-is bill of sale, you generally cannot go back to the seller for repair costs or defects you discover afterward, even serious ones.
Under the Uniform Commercial Code, which most states have adopted, a seller can exclude all implied warranties with language such as “as is” or “with all faults” in the bill of sale.1Legal Information Institute. UCC 2-316 – Exclusion or Modification of Warranties For the disclaimer to hold, the language has to be conspicuous. Fine print or vague wording can be enough to make it unenforceable. Sellers should put the clause in bold or all caps in a stand-alone paragraph.
For the buyer, this is why a pre-purchase inspection is worth paying for. Have a diesel mechanic go through the engine, transmission, aftertreatment system, and frame before you commit. The cost is trivial next to a cracked frame rail or blown turbo you inherit the moment you sign.
Signatures and Notarization
Both buyer and seller sign and date the document. Some states require notarization before the bill of sale can be used for a title transfer. When a notary is involved, both parties need valid government-issued photo ID. Notary fees for a simple acknowledgment typically run $5 to $25 depending on the state, with a few states capping fees by statute.
Even where notarization is not legally required, it is worth doing on a transaction that may run $30,000 to $150,000. A notarized document is harder to challenge later, and the fee is negligible against the value of the asset.
Odometer Disclosure Usually Does Not Apply
One point that surprises buyers: most semi trucks are exempt from federal odometer disclosure. Any vehicle with a GVWR over 16,000 pounds falls outside the requirement, which covers virtually every Class 8 tractor on the road.2eCFR. 49 CFR 580.17 – Exemptions The exemption exists because heavy vehicles accumulate miles so quickly that the reading is less meaningful.
The exemption does not make mileage irrelevant to your purchase. Ask for maintenance records and verify mileage through service history or engine control module data. Odometer fraud remains illegal on any vehicle: civil penalties run up to $10,000 per violation with a $1,000,000 cap on a related series, plus potential criminal penalties of up to three years in prison.3Office of the Law Revision Counsel. 49 USC 32709 – Penalties and Enforcement For lighter commercial trucks under the 16,000-pound threshold, the standard disclosure rules do apply, and the seller must give an accurate mileage statement on the title at transfer.
Heavy Vehicle Use Tax and the Stamped Schedule 1
This is the federal obligation that trips up first-time buyers. Any highway vehicle with a taxable gross weight of 55,000 pounds or more owes an annual Heavy Vehicle Use Tax to the IRS.4Internal Revenue Service. About Form 2290, Heavy Highway Vehicle Use Tax Return The tax period runs July 1 through June 30. Annual amounts range from $100 at 55,000 pounds up to $550 at 100,000 pounds or more.5Internal Revenue Service. Instructions for Form 2290
When you buy a used tractor, the HVUT picture depends on whether the seller already paid for the current period. If they did, you owe a prorated amount covering the months from the month after your purchase through the end of the period. You need to confirm the seller’s payment by getting a copy of their IRS-stamped Schedule 1. Without that stamped Schedule 1, you cannot register the truck at the DMV.5Internal Revenue Service. Instructions for Form 2290
If the seller held the vehicle under a mileage suspension (5,000 miles or fewer in the period, or 7,500 for agricultural use), the seller must give you a written statement showing their name, EIN, the VIN, the sale date, and the odometer readings at the start of the period and at the time of sale. If the truck later exceeds the mileage limit under your ownership, you owe the full tax.5Internal Revenue Service. Instructions for Form 2290
Federal Excise Tax Applies Only to New Trucks
If you are buying a brand-new tractor, a separate federal tax applies. The first retail sale of a heavy truck chassis, body, or tractor designed for highway use carries a 12% federal excise tax on the sale price.6Office of the Law Revision Counsel. 26 USC 4051 – Imposition of Tax on Heavy Trucks and Trailers The dealer pays the tax at the point of sale and typically passes it through to the buyer. It applies only to the first retail sale, so used-truck purchases are not subject to the FET. On a $180,000 new Peterbilt or Kenworth, that is $21,600 in federal tax alone.
Transferring Title and Paying State Sales Tax
Once the bill of sale is signed, the buyer takes it to the state motor vehicle agency to transfer title. Bring the original bill of sale, the signed-over title from the seller, your stamped Schedule 1 (for trucks at 55,000 pounds or above), proof of insurance, and a valid ID. Some states require VIN verification or a physical inspection for vehicles coming from out of state, so check the requirements before you go.
You pay state sales tax at the time of transfer. Rates vary by state and sometimes by county. Some states offer a sales tax exemption for vehicles used primarily in interstate commerce, typically requiring that the truck be registered under the International Registration Plan and that the buyer hold operating authority as a for-hire carrier. The criteria and application process differ by state, so contact your DMV or revenue department before assuming you qualify. During the few weeks it may take for the new title to arrive, your validated bill of sale and temporary registration receipt serve as proof of ownership.
USDOT, IRP, and IFTA Credentials Do Not Transfer
A USDOT number stays with the entity that registered it. It cannot be sold, reassigned, or transferred to a new owner.7Federal Motor Carrier Safety Administration. Do I Need a New USDOT Number If you are buying the truck to operate as a motor carrier, you need your own USDOT number. New carriers file an MCS-150 and, for interstate operations, the appropriate OP-1 application for operating authority.8Federal Motor Carrier Safety Administration. New Entrant Safety Assurance Program The seller should update their MCS-150 to remove the vehicle from their fleet.
If the truck will cross state lines at a combined gross weight over 26,000 pounds, you also need to register under the International Registration Plan, which apportions your registration fees across the states where you operate based on miles traveled.9International Registration Plan, Inc. International Registration Plan You will need IFTA credentials for fuel tax reporting as well. Both IRP and IFTA are tied to the carrier, not the vehicle, so the seller’s credentials do not come with the truck. Apply through your base jurisdiction.
Keep the Paperwork
Both parties should retain signed copies of the bill of sale indefinitely. For the seller, it fixes the date the truck changed hands, which matters for insurance cancellation, liability cutoff, and tax reporting; if the truck is in an accident after the sale, the seller’s copy is the fastest proof they no longer owned it. For the buyer, it supports your cost basis for depreciation if the truck is used in a business, documents the purchase price for sales tax, and backs up the title if it is ever lost or disputed. Keep it in one folder with your stamped Schedule 1, the lien release if there was one, and any pre-purchase inspection reports.