Montana Vehicle Bill of Sale Laws — 2026 Legal Requirements

Montana bill of sale: what state law requires

Montana treats a private vehicle bill of sale as legally binding once both parties sign. The document serves three functions under state law: it transfers ownership, establishes the agreed price for sales tax purposes, and creates evidence that the seller is no longer responsible for the vehicle after the sale date. Montana does not publish a mandatory official form, but the bill of sale must contain specific required fields to be accepted by the Montana DMV.

Required disclosures and fields

Every bill of sale used for a Montana private vehicle transfer must include the buyer's and seller's full legal names, addresses, and signatures, the vehicle identification number (VIN), year, make, and model, the odometer reading at the time of sale, the agreed sale price (or notation of gift if no money changed hands), and the date of the transaction. Montana accepts a typed or handwritten document so long as all required fields are present and legible.

• No state sales tax on vehicle purchases
• Notarized title assignment required
• County option fee may apply
• Popular for LLC vehicle registration due to no sales tax

Notarization rules in Montana

Montana requires the vehicle title to be notarized for transfer, but the bill of sale itself does not require notarization. Sellers should sign the title in the presence of a notary public before delivering it to the buyer.

Title transfer deadlines

Under Montana law, the buyer must complete the title transfer at the Montana DMV within 40 days of the sale date. Missing this deadline results in late title fees, which compound over time. The deadline begins on the sale date documented in the bill of sale, which is one of the reasons the document is required. The state title fee is $12. Current procedures are published at the Montana DMV.

Odometer disclosure under federal and Montana law

Federal law under 49 CFR Part 580 (the Truth in Mileage Act) requires the seller to certify the odometer reading in writing at the time of sale for any vehicle under 10 model years old and under 16,000 pounds GVWR. In Montana this disclosure is typically made directly on the title in the designated odometer field; if the title lacks the field, the bill of sale must serve as the disclosure document. Falsifying an odometer disclosure is a federal crime under 49 U.S.C. § 32709 with civil penalties of up to three times actual damages or $10,000 per violation, plus state-level consumer-protection penalties.

Sales tax obligations

Montana applies the following sales tax to private vehicle sales: No sales tax; registration fee based on age and value. The seller is not responsible for collecting or remitting sales tax in a private-party sale — that is the buyer's obligation at the DMV. However, the bill of sale must accurately state the sale price; the DMV uses this figure (or the state's published fair-market value, whichever is higher) to compute the tax.

Penalties for non-compliance

Failing to comply with Montana bill of sale and title transfer law exposes both parties to risk. Sellers who do not file a release of liability remain legally responsible for the vehicle after sale and can be held accountable for the buyer's parking tickets, toll violations, and even accidents. Buyers who do not transfer the title within the statutory deadline incur late fees and, in some cases, criminal penalties for unregistered vehicle operation. Both parties are also at risk if the bill of sale contains an inaccurate sale price intended to reduce sales tax — this constitutes tax fraud under Montana and federal law.

Buyer and seller rights

Under Montana law, both buyer and seller have specific rights that the bill of sale documents. The seller has the right to be released from liability once the title is transferred — the bill of sale, along with the release of liability filing, is the seller's primary evidence of transfer. The buyer has the right to a clean title and an accurate odometer reading; if either is misrepresented, the buyer may pursue civil action under Montana consumer-protection statutes and federal Truth in Mileage Act provisions. Both parties have the right to retain signed copies of the bill of sale for their records.

How to use a Montana bill of sale correctly

1. Use a bill of sale template that includes all Montana-required fields, or generate one with BillOfSaleNow's Montana-specific generator.
2. Both buyer and seller complete the form together at the time of sale.
3. Sign in front of a witness (recommended but not required in Montana).
4. Each party retains a signed copy.
5. The seller files a release of liability with the Montana DMV (typically online or by mail).
6. The buyer takes the signed title, bill of sale, and odometer disclosure to the Montana DMV to complete the title transfer within 40 days.
7. Out-of-state vehicles require a VIN inspection. Schedule this with the Montana DMV before completing the title transfer.