ATF Form 4473 Question 21: The Most Misunderstood Section

If you ask experienced FFL dealers which part of Form 4473 causes the most compliance headaches, the answer is almost always Question 21 — the series of yes/no questions that determine whether the buyer is legally eligible to receive a firearm. This section is the legal heart of the 4473. It's also where false statements, incomplete answers, and documentation errors concentrate.

What Question 21 Actually Covers

Question 21 on the current version of Form 4473 contains a series of sub-questions (21a through 21n as of this writing, though the form is periodically updated) asking the buyer to self-certify their eligibility. The questions cover:

• Whether the buyer is the actual buyer (21a — the anti-straw purchase certification)
• Whether the buyer is under indictment or information for a felony (21b)
• Whether the buyer has been convicted of a felony (21c)
• Whether the buyer is a fugitive from justice (21d)
• Whether the buyer is an unlawful user of controlled substances (21e)
• Whether the buyer has been adjudicated as a mental defective or committed to a mental institution (21f)
• Whether the buyer has been discharged from the military under dishonorable conditions (21g)
• Whether the buyer has renounced U.S. citizenship (21h)
• Whether the buyer is subject to a domestic violence restraining order (21i)
• Whether the buyer has been convicted of a misdemeanor crime of domestic violence (21j)
• Whether the buyer is an alien illegally in the U.S. or has been admitted on a nonimmigrant visa (21k/21l)

The Most Commonly Misunderstood Questions

Question 21e — Drug Use

This question asks whether the buyer is an "unlawful user of or addicted to" marijuana or any controlled substance. With marijuana legal in many states, buyers frequently answer "no" believing their state-legal use isn't covered. It is. Marijuana remains a Schedule I controlled substance under federal law. A person who uses marijuana — even in a state where it's legal — is prohibited from purchasing a firearm under federal law. The ATF has issued explicit guidance on this point. Dealers who have reason to believe a buyer uses marijuana — based on statements the buyer makes — may not complete the transfer.

Question 21f — Mental Health

This question asks about adjudication as a "mental defective" — a legal term that many buyers interpret as referring only to severe psychiatric conditions. In reality, any judicial finding of mental incompetence, including in guardianship proceedings, may qualify. Buyers who have been involuntarily committed to any mental institution for any period also answer "yes" here. The definition is broader than many buyers (and some dealers) realize.

Question 21i — Restraining Orders

A domestic violence restraining order only triggers the prohibition if it meets specific criteria: it must have been issued after a hearing where the buyer had notice and opportunity to participate, it must restrain the buyer from harassing or threatening an intimate partner or child, and it must include a finding that the buyer poses a credible threat or explicitly prohibits the use of force. Not every restraining order qualifies. But buyers who answer "no" without fully understanding the criteria create a documentation problem if the order later surfaces.

Documentation Errors on Question 21

Beyond substantive eligibility issues, Question 21 generates documentation violations that are entirely procedural:

Leaving Sub-Questions Blank

Every sub-question must be answered — yes or no. A blank answer is a reporting violation even if the buyer would have answered "no." Some buyers skip questions they consider obviously inapplicable. Review the form before accepting it.

Inconsistent Answers

A buyer who answers "yes" to Question 21b (under indictment) but "no" to Question 21c (convicted of a felony) — when the indictment is for a felony charge — creates a documentation issue that the IOI will flag. You don't need to resolve every legal nuance, but obvious inconsistencies should prompt a conversation with the buyer before the transfer.

Not Completing the Dealer Certification

After the buyer completes their section, the dealer must complete the transferor certification in Section E — certifying that they examined the buyer's ID, conducted the NICS check, and have no reason to believe the transaction is unlawful. This section is frequently incomplete or missing the dealer's signature. Without it, the Form 4473 is not legally complete.

When a Buyer Answers "Yes"

If a buyer answers "yes" to any of the prohibiting questions (21b through 21n), the transfer cannot proceed. Period. The dealer should inform the buyer that they cannot complete the transfer without disclosing specific reasons. The completed (but unsigned by the transferor) Form 4473 should be retained for 5 years. If the buyer provided false information on the form, that's a federal false statement felony — but documenting what you observed and retaining the form is your obligation. Prosecution is law enforcement's.