What documents do I need to buy a car from a private seller in Montana?

You need: (1) the signed title from the seller, (2) a completed bill of sale, (3) your photo ID, and (4) payment for registration and sales tax (varies by state and county). An odometer disclosure statement is also required.

How long do I have to register a car I bought from a private seller in Montana?

Montana requires you to register the vehicle within 30 days of purchase. Registering late may result in penalty fees of $25–$100+ and potential citations for unregistered plates.

Does Montana require a bill of sale for a private car sale?

Montana does not legally require a bill of sale for private car sales, but it is strongly recommended. It documents the agreed sale price (used for tax calculation) and protects both parties.

How do I check for liens on a used car?

The title will show any lienholder on the front. If a lien is listed, the seller must provide a lien release letter from the lender before you can take clear title. You can also check for liens through your state DMV or a paid title search service.

What is an "as-is" private car sale?

Most private car sales are "as-is," meaning the seller makes no warranties about the vehicle's condition. Once you buy it, any mechanical issues are your responsibility. A pre-purchase inspection by an independent mechanic is the best protection.

What sales tax do I pay when buying from a private seller in Montana?

Montana charges varies by state and county in sales or use tax on vehicle purchases. For private sales, this is typically paid when you register the vehicle at the State DMV — bring your bill of sale showing the purchase price.

Buying a Car From a Private Seller in Montana (2025)

Complete checklist, required documents, title transfer steps, and buyer protection tips for purchasing a vehicle from a private seller in Montana.

Montana Private Sale — Key Facts

Bill of saleNot required — strongly recommended
Odometer disclosureRequired
Title notarizationNot required
Smog from sellerNot required
Days to register30 days from purchase
Sales taxvaries by state and county

Contact your state DMV for specific requirements when buying a car from a private seller.

Buyer Checklist — Montana

✓Run a vehicle history report (Carfax / AutoCheck)
✓Check for liens on the title
✓Inspect the vehicle with a mechanic before buying
✓Verify seller's name matches the title
○Get smog certificate from seller (not required in Montana)
✓Sign and complete the bill of sale (recommended)
✓Seller signs the back of the title
✓Complete odometer disclosure (required)
✓Register at the State DMV within 30 days

Step-by-Step: Buying From a Private Seller in Montana

1
Research the vehicle before you go
Use the VIN to pull a vehicle history report. Check for accidents, title brands, odometer issues, and open recalls. Verify the VIN on the report matches the VIN on the dashboard and title.
2
Inspect in person — ideally with a mechanic
A pre-purchase inspection at an independent shop costs $100–$150 and can reveal hidden problems worth thousands. Never skip this on a private sale — there's no warranty.
3
Verify the title
Check that the title is clean (no liens, no salvage/rebuilt/flood brand), in the seller's name, and that the VIN matches. If a lender is listed, get a lien release before completing the sale.
4
Complete the paperwork
Sign a bill of sale. The seller signs the back of the title. Complete the odometer disclosure statement. Keep copies of everything.
5
Register at the State DMV within 30 days
Bring the signed title, bill of sale, photo ID, and payment for registration and sales tax (varies by state and county of the sale price). Late registration results in penalties.

Red Flags: When to Walk Away

✗Seller does not have the title in their name
✗Title shows a lien and seller cannot provide a lien release
✗VIN on title does not match VIN on dashboard or door jamb
✗Title is salvage, rebuilt, flood, or lemon law buyback
✗Seller insists on meeting only at night or refuses a mechanic inspection
✗Price is significantly below market — may signal hidden problems or a stolen vehicle
✗Seller pressures you to sign quickly without reviewing documents

FAQ — Buying a Car From a Private Seller in Montana

Is it safe to buy a car from a private seller in Montana?: Private sales are legal and common, but they carry more risk than dealer sales because there is no warranty and limited recourse after the sale. Protect yourself with a vehicle history report, independent inspection, and a signed bill of sale.
What should a bill of sale include for a private car sale?: The bill of sale should include: vehicle year, make, model, VIN, odometer reading, sale price, date of sale, seller and buyer names and addresses, and both signatures. In some states, 'sold as-is' language is recommended.
How much tax do I pay when buying from a private seller in Montana?: Montana charges varies by state and county in sales or use tax on vehicle purchases. This is paid at the time of registration, based on the sale price in your bill of sale.
Can I drive the car home before registering it?: Technically you need valid registration or a temporary permit to drive legally. Some states issue a temporary registration at the DMV. In others, you may need a temporary operating permit. Contact the State DMV for the current process in Montana.

Official Resource

State DMV →

Get Your Bill of Sale

A signed bill of sale protects you in a private car purchase in Montana. Generate a free, state-specific form.

Montana Car Bill of Sale →