Free Idaho Gun / Firearm Bill of Sale
Idaho is a Constitutional Carry state (permitless carry since 2016) with no firearm registration and no requirement for a background check on private-party sales between Idaho residents. That does not mean a bill of sale is unnecessary — it is the only paper trail documenting that you transferred the firearm legally and are no longer responsible for its use.
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Idaho Gun / Firearm Bill of Sale — What You Need to Know
Sales Tax Details
Standard 6% Idaho sales tax applies to firearms purchased from licensed dealers. Private-party sales are subject to 6% use tax, though private enforcement is limited.
Idaho Gun / Firearm Sale — Step-by-Step Checklist
- Record the firearm's make, model, caliber, and full serial number on the bill of sale.
- Include both parties' full legal names, addresses, and Idaho driver's license numbers.
- Add a statement that to the best of the seller's knowledge the buyer is a legal Idaho resident who is not prohibited from possessing firearms.
- Both parties sign and date the document; each keeps a copy.
- Store your copy indefinitely — if this firearm is ever used in a crime, your bill of sale is your evidence that you sold it before the incident.
- For NFA items (suppressors), the ATF Form 4 transfer process with the $200 tax stamp is still required regardless of Idaho's permissive state laws.
Common Pitfalls
- Believing Constitutional Carry means zero federal restrictions: federal law still prohibits selling to prohibited persons (convicted felons, domestic violence misdemeanants, etc.). A private seller who knowingly sells to a prohibited person faces federal felony charges.
- Omitting the serial number: a bill of sale without a serial number cannot prove which specific firearm was transferred and provides limited legal protection.
- Selling a suppressor without an ATF Form 4: Idaho allows suppressor ownership, but federal NFA rules require an approved transfer with a $200 tax stamp regardless of state law.
- Not keeping a copy: once you hand over the gun, your only evidence of legal transfer is your copy of the bill of sale.
Pro Tip
Idaho's firearm laws are among the most permissive in the nation, but federal law applies everywhere. When in doubt about whether a buyer may legally possess a firearm, declining the sale is always the right choice — no bill of sale clause protects a seller who knowingly arms a prohibited person.