Free Montana Gun / Firearm Bill of Sale
Montana is a Constitutional Carry state under MCA § 45-8-316, allowing most adults to carry a firearm — concealed or open — without a permit. Private party firearm sales between Montana residents require no background check, no registration, and no government notification. Despite this permissive environment, a signed bill of sale is the most important document you can produce if a firearm is ever traced back to you after a sale.
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Montana Gun / Firearm Bill of Sale — What You Need to Know
Sales Tax Details
No sales tax on any transaction in Montana, including private firearm sales.
Exemption: All private party sales are exempt from Montana sales tax. Federal excise tax (Pittman-Robertson, 10–11%) applies to new firearms at the manufacturer/importer level, not at private resale.
Inspection Requirements
No background check is required by Montana law for private party sales between Montana residents. Federal law does not require a background check for private (non-dealer) sales. Keep a bill of sale regardless.
Montana Gun / Firearm Sale — Step-by-Step Checklist
- Record the firearm's make, model, caliber or gauge, action type, and full serial number in the bill of sale.
- Include any accessories being sold with the firearm (optics, extra magazines, suppressor if applicable) as a separate itemized list.
- Both seller and buyer sign and date the bill of sale with full legal names and addresses.
- Seller verifies buyer appears to be a lawful Montana resident — while no background check is required for private sales, federal law (18 U.S.C. § 922) prohibits knowingly selling to a prohibited person.
- If transferring a suppressor, verify the buyer holds a valid ATF Form 4 approval and federal NFA tax stamp — Montana law allows suppressor ownership but federal law controls the transfer process.
- Seller keeps the original bill of sale permanently — if the firearm is later used in a crime, this document is your proof of when you divested ownership.
- Buyer stores bill of sale with the firearm's other documentation as proof of lawful private purchase.
Common Pitfalls
- Not keeping a bill of sale: this is the most consequential omission in a Montana private firearm sale. If a gun you sold five years ago turns up at a crime scene, a signed and dated bill of sale is your primary documentary defense that you are not the current owner.
- Selling to a prohibited person: even without a background check requirement, federal law prohibits selling to anyone prohibited under 18 U.S.C. § 922(g) — felons, domestic violence misdemeanants, drug users, etc. A private seller who knowingly makes such a sale faces federal prosecution.
- Misunderstanding the Montana Firearms Freedom Act: the Act (MCA § 30-20-101 et seq.) asserts state sovereignty over intrastate firearms, but federal courts have consistently held that federal gun laws still apply. Do not rely on the MFFA to bypass NFA requirements for suppressors or short-barreled rifles.
- Incomplete serial number documentation: partial or illegible serial numbers have no evidentiary value. Verify the number physically on the firearm and write it in full.
- Assuming Constitutional Carry extends to all locations: even in Montana, firearms are prohibited in state and federal government buildings, schools, and certain other locations — this affects the buyer's use, not the sale itself, but worth mentioning in a sale to a newcomer.
Pro Tip
The permissive legal environment in Montana for private firearm sales puts the documentation burden entirely on the parties — there is no government record of the transfer unless you create one. A thorough bill of sale is that record. Store it alongside the firearm's purchase receipt and any warranty documentation, and never discard it.