How to Fill Out ATF Form 23 (w/Examples) + FAQs

ATF Form 23, officially titled the NFA Responsible Person Questionnaire, is the federal form that every “responsible person” of a trust or legal entity must complete when that entity applies to make or transfer a National Firearms Act (NFA) item. You fill it out by entering personal identifying information, answering eligibility questions, attaching two FD-258 fingerprint cards and a passport photo, and forwarding a copy to your local Chief Law Enforcement Officer (CLEO).

The form exists because the ATF 41F Final Rule, effective July 13, 2016, closed the so-called “trust loophole” that let entity applicants skip background checks. Missing a single field, a single signature, or a single CLEO copy can void your entire Form 1, Form 4, or Form 5 submission, costing you months of wait time and potentially your $200 tax stamp.

According to ATF eForms processing data, more than 60% of paper NFA applications contain at least one fixable error, and Form 23 mistakes are the single most common reason for rejection of entity-based filings.

Here is what you will learn in this guide:

• 📝 How to complete every block of ATF Form 23 line by line, with real examples
• ⚖️ The exact federal rules under 27 CFR 479 that control who counts as a responsible person
• 🖐️ How to handle fingerprints, photos, and CLEO notification without delays
• 🚫 The seven most expensive mistakes filers make and how to avoid each one
• ❓ Ten plain-English FAQs covering trusts, LLCs, minors, felons, and resubmissions

What ATF Form 23 Is and Why It Exists

ATF Form 23, also numbered ATF Form 5320.23, is a four-page federal document that the Bureau of Alcohol, Tobacco, Firearms and Explosives uses to vet each human being who can direct an entity’s NFA-regulated property. The form attaches to the underlying application, which is usually a Form 1 for making an NFA item, a Form 4 for transferring one, or a Form 5 for tax-exempt transfers. Without a properly completed Form 23 for every responsible person, the underlying application cannot move forward.

Congress created the National Firearms Act in 1934, and the statute lives at 26 U.S.C. Chapter 53. For decades, individuals had to submit fingerprints and photos, but trusts and corporations did not. The 41F rulemaking changed that by requiring entity applicants to identify each responsible person and run each through the same background check as an individual buyer.

The consequence of ignoring Form 23 is severe. The ATF will return your application as deficient under 27 CFR 479.63, and you lose your place in the processing queue. A common misconception is that only the trustee who signs the Form 1 or Form 4 must file a Form 23, but every co-trustee, manager, or officer who can possess or direct the NFA item must file one too.

A real-world example helps anchor this. Marcus, an Atlanta gun-trust grantor, listed three co-trustees on his trust but only submitted his own Form 23. The ATF returned his Form 4 suppressor transfer four months later, and he had to restart the process with two additional Form 23 packets for the missing trustees.

Who Counts as a “Responsible Person”

The ATF defines a responsible person in 27 CFR 479.11 as anyone who possesses, directly or indirectly, the power or authority to direct the management and policies of the trust or entity as it relates to the NFA firearm. For a gun trust, this almost always includes the grantor and every co-trustee. For an LLC, it includes managers, members with management power, and any officer with possession authority.

The consequence of guessing wrong cuts both ways. Listing too few responsible persons triggers an ATF denial. Listing too many forces extra fingerprints, extra photos, and extra CLEO copies, which adds cost and delay but does not invalidate the application.

A common mistake is treating beneficiaries as responsible persons. Beneficiaries who cannot direct the trust until a triggering event (such as the grantor’s death) are not responsible persons today, and they do not file Form 23.

Elena set up a Nevada single-member LLC to hold a short-barreled rifle. She named her adult son as a “successor manager” who only takes control if she becomes incapacitated. Because he has no present authority, he does not file Form 23 with the initial Form 1.

How Form 23 Connects to Forms 1, 4, and 5

Form 23 never travels alone. It rides along with the parent application and must reference the same item, the same entity, and the same control or serial number. The ATF eForms portal now requires you to attach Form 23 PDFs or fill them electronically inside the parent application workflow.

The consequence of a mismatch between Form 23 and the parent form is rejection for inconsistent data. If your trust name on Form 23 reads “Smith Family Trust” but the Form 4 reads “The Smith Family Revocable Living Trust,” the ATF examiner will flag the file.

A practical tip is to copy the entity name exactly as it appears on the trust document or the state-filed Articles of Organization. Use the same hyphens, the same capitalization, and the same word order across every page.

Federal Law Driving the Form

The legal backbone of Form 23 is the National Firearms Act of 1934, as amended by the Gun Control Act of 1968 and clarified by the 41F rule. The implementing regulations live in 27 CFR Part 479, and the criminal penalties for false statements live in 26 U.S.C. § 5871 and 18 U.S.C. § 1001.

Section 5871 sets a maximum fine of $10,000 and up to 10 years in federal prison for willful violations of the NFA, which includes lying on Form 23. Section 1001 adds up to 5 years in prison for any false statement to a federal agency. The consequence here is not theoretical, and federal prosecutors have charged defendants who concealed felony records on NFA paperwork.

A common misconception is that a state-level expungement or sealed record means you can answer “no” to the federal prohibitor questions. Federal law controls the answer, and many state expungements do not restore federal firearm rights under 18 U.S.C. § 922(g).

David in Ohio had a 2008 felony drug conviction that Ohio sealed in 2019. He answered “no” to question 14a on his Form 23. The ATF cross-checked NICS, found the federal record, and referred his case for prosecution under 18 U.S.C. § 922(a)(6).

The 41F Rule Explained

The 41F Final Rule became effective on July 13, 2016. Before that date, an entity could buy a suppressor with no fingerprints, no photos, and no CLEO notification for any human owner. After that date, every responsible person must submit fingerprints, a photo, and a CLEO copy.

The consequence of the rule was a one-time spike in applications just before July 2016, followed by a permanent shift in trust strategy. Many filers now keep trusts lean, with one or two trustees, to reduce paperwork.

A common misconception is that 41F also requires CLEO approval. It does not. The CLEO only needs to be notified, and the CLEO has no veto power under 27 CFR 479.85.

CLEO Notification Requirements

The CLEO notification rule requires you to send a complete copy of Form 23 to the chief law enforcement officer with jurisdiction over your residence. The CLEO is usually the county sheriff, the chief of police, or in some jurisdictions the state police commander.

The consequence of skipping CLEO notification is automatic rejection. The ATF examiner checks the certification box on Form 23 and may call the CLEO to confirm receipt.

A common mistake is mailing the CLEO copy after submitting the ATF copy. Best practice is to mail both on the same day, keep certified-mail receipts, and write the CLEO mailing date on the Form 23 certification block.

How to Fill Out ATF Form 23 Line by Line

Form 23 is divided into numbered blocks. Each block has a specific purpose, and each requires either text, a checkbox, a signature, or an attachment. The current version is dated 5320.23 and runs four pages.

Work through the form in order. Skip nothing. Use black ink on paper or type directly in the PDF.

Block 1: Application Type and Control Number

Block 1 asks you to identify the parent form. Check the box for Form 1, Form 4, or Form 5, and enter the control number assigned to that parent application. On eForms, this auto-populates.

The consequence of mismatched control numbers is a delay of weeks while the ATF reunites your packet. Always copy the control number character by character.

A common misconception is that you can leave the control number blank if you submit Form 23 with the parent application in the same envelope. The ATF still requires the number, because internal scanning separates documents on intake.

Priya in Houston submitted three Form 23s with her Form 1 SBR application. She wrote the wrong control number on one, and the ATF processed two responsible persons but flagged the third for “no parent application,” delaying the build by two months.

Block 2: Responsible Person Identification

Block 2 collects the responsible person’s full legal name, all aliases, current residence address, date of birth, place of birth, country of citizenship, and Social Security number (optional but recommended). The address must match the address on the FD-258 fingerprint card.

The consequence of inconsistent addresses is a NICS check failure. The ATF runs the address through multiple databases, and a P.O. box will trigger rejection because federal firearms transactions require a physical residence.

A common mistake is using a work address or a parents’ address for college students. List the actual physical residence where you sleep most nights.

Block 3: Entity Information

Block 3 captures the trust or entity name, the entity’s address, and the entity’s Employer Identification Number (EIN) if it has one. Single-member LLCs that use the owner’s SSN may leave the EIN blank.

The consequence of an entity-name mismatch is the same as a control-number mismatch: rejection. Copy the trust name exactly from the executed trust document.

A common misconception is that you must obtain an EIN for every gun trust. The IRS does not require an EIN for a grantor-revocable trust, and the ATF accepts the grantor’s SSN in that case.

Block 4: Photograph

Block 4 requires a 2×2 inch passport-style photograph taken within the past year. Staple or tape it to the form in the designated square. The background must be plain white or off-white, and the subject must face the camera without a hat or sunglasses.

The consequence of an out-of-date or non-compliant photo is rejection. The ATF compares the photo to the fingerprint card data and to driver’s license records when needed.

Jamal used a four-year-old passport photo for his Form 23. The ATF returned the packet because the photo predated the one-year rule under 27 CFR 479.63(b)(2).

Block 5: Fingerprint Cards

Block 5 references the two completed FBI FD-258 fingerprint cards that must accompany the Form 23. Both cards must be in original ink, not photocopies. The cards must list “ATF” as the reason for fingerprinting and “ATF, 244 Needy Road, Martinsburg, WV 25405” as the destination.

The consequence of a smudged or photocopied print is rejection and a one- to two-month delay. Use a certified fingerprint technician at a local police station or a UPS Store that offers Live Scan.

A common misconception is that Live Scan electronic prints automatically transmit to the ATF. They do not for paper Form 23 filings. You still need printed FD-258 cards in the packet. Only eForms accepts true electronic fingerprint submissions.

Blocks 6–13: Personal History

Blocks 6 through 13 ask about height, weight, race, sex, eye color, hair color, ethnicity, and state of birth. These categories use OMB standard race and ethnicity codes. Answer truthfully, even when categories feel imprecise.

The consequence of skipping a demographic block is rejection for incomplete data. The ATF uses these fields to match NICS records when names are common.

A common mistake is listing “American” as ethnicity. The form asks for Hispanic/Latino or Non-Hispanic/Non-Latino under the OMB framework.

Blocks 14a–14k: Prohibitor Questions

Blocks 14a through 14k mirror the prohibitor questions on ATF Form 4473. They cover felony convictions, fugitive status, controlled-substance use, mental commitments, dishonorable discharge, restraining orders, misdemeanor domestic violence, renunciation of citizenship, unlawful alien status, and indictment.

The consequence of a false “no” answer is felony prosecution under 18 U.S.C. § 922(a)(6). Federal courts treat marijuana use as a disqualifier even in legal-recreational states, because marijuana remains Schedule I federally.

A common misconception involves medical marijuana cards. The ATF open letter from 2011 makes clear that any medical-marijuana cardholder must answer “yes” to question 14e and is therefore prohibited from owning firearms or NFA items.

Sarah in Colorado had a state medical-marijuana card. She answered “no” to 14e on her Form 23 because marijuana is legal in Colorado. The ATF discovered the card during background check, denied the application, and referred her for prosecution.

Block 15: Certification and Signature

Block 15 contains the under-penalty-of-perjury certification. The responsible person signs and dates this block. Electronic signatures via eForms are acceptable, but paper filings need an original ink signature.

The consequence of an unsigned Form 23 is automatic return. The ATF treats unsigned forms as if they were never filed.

A common misconception is that a notary must witness the signature. No notarization is required under 27 CFR 479.63.

Block 16: CLEO Certification

Block 16 confirms that you mailed a copy of Form 23 to the CLEO. Enter the CLEO’s name, title, agency, and mailing address. The mailing date goes in this block as well.

The consequence of a blank or false CLEO block is rejection. The ATF spot-checks CLEO receipt by phone.

A common mistake is mailing the CLEO copy to a generic agency address instead of the named CLEO. Use the chief’s specific name and title.

Three Common Scenarios

Below are three of the most common Form 23 scenarios in 2026, drawn from current eForms data.

Scenario 1: Single-Trustee Gun Trust Buying a Suppressor

Filer Action	ATF Outcome
Grantor is sole trustee, files one Form 23 with Form 4	Background check runs on grantor, suppressor approved in 30–90 days via eForms
Grantor adds spouse as co-trustee mid-application	ATF rejects file, requires new Form 23 for spouse and restart of pending period
Grantor lists adult child as beneficiary only	No Form 23 required for child, application proceeds normally

Scenario 2: Multi-Member LLC Building an SBR

Filer Action	ATF Outcome
Two managing members each file Form 23 with Form 1	Both backgrounds clear, SBR approved and added to LLC inventory
One member fails to mail CLEO copy	ATF flags missing CLEO certification, returns entire Form 1 packet
Silent member with no management power skips Form 23	Permissible under 27 CFR 479.11, application proceeds

Scenario 3: Estate Form 5 Transfer to Heir Trust

Filer Action	ATF Outcome
Executor transfers NFA item tax-free via Form 5 to a new heir trust	Each new trustee files Form 23, transfer approved under 26 U.S.C. § 5852
Heir trust forgets one trustee’s Form 23	ATF returns Form 5 as deficient, item remains in estate
Heir is a prohibited person	Transfer denied, ATF requires lawful disposition under 27 CFR 478.129

Three Named Examples of Form 23 Filings

Carlos, a Phoenix firearms instructor, set up a single-member LLC to hold a suppressor for his training school. He filed one Form 23 as the sole managing member, attached two FD-258 cards, a current passport photo, and mailed the CLEO copy to the Maricopa County Sheriff. His Form 4 cleared eForms in 41 days.

Hannah, a Vermont gun-trust grantor, named herself and her brother as co-trustees. She filed two Form 23s with her Form 1 SBR application, used Silencer Shop kiosk fingerprinting, and mailed CLEO copies to both her town police chief and her brother’s town chief because they lived in different jurisdictions. Her SBR cleared in 28 days.

Robert, a Pennsylvania estate executor, used Form 5 to move three suppressors from his late father’s individual registration to a new family heir trust with four trustees. He filed four Form 23 packets, one per trustee, and the tax-exempt transfer cleared in 90 days under 26 U.S.C. § 5852(e).

Mistakes to Avoid

Below are the seven most expensive Form 23 mistakes and the consequence of each.

• Using a P.O. box instead of a physical residence triggers automatic rejection because federal firearm rules require a physical address.
• Photocopying FD-258 cards instead of submitting original ink cards forces a restart and roughly a one-month delay.
• Forgetting to mail the CLEO copy voids the certification in Block 16 and returns the entire packet to you.
• Answering “no” to question 14e while holding a medical-marijuana card creates felony exposure under 18 U.S.C. § 922(a)(6).
• Misspelling the trust name causes a data mismatch with the parent Form 1 or Form 4 and triggers examiner rejection.
• Submitting a passport photo older than one year violates 27 CFR 479.63(b)(2) and forces resubmission.
• Listing beneficiaries as responsible persons inflates paperwork and delays the application, even though it does not invalidate it.

Dos and Don’ts

Follow these rules to keep your Form 23 clean.

• Do file one Form 23 per responsible person, because each human with management power must clear NICS individually.
• Do match the entity name letter for letter across all forms, because examiners reject any mismatch as a data error.
• Do mail CLEO copies the same day you submit the ATF copy, because synchronized mailing supports your certification.
• Do keep certified-mail receipts for CLEO notification, because the ATF may verify mailing if questions arise.
• Do use eForms when possible, because median approval times in 2026 run under 60 days versus 9–12 months for paper.
• Don’t submit photocopied fingerprint cards, because the FBI rejects photocopies and the ATF returns the packet.
• Don’t list beneficiaries as responsible persons, because that adds cost without legal benefit.
• Don’t answer prohibitor questions based on state law alone, because federal law controls under 18 U.S.C. § 922(g).
• Don’t use a nickname in Block 2, because legal name mismatches with NICS records trigger denials.
• Don’t sign the form before fingerprinting, because the certification date should match or follow the fingerprint date.

Pros and Cons of Filing via Entity Versus Individual

Entity filing through a trust or LLC carries trade-offs compared to individual filing.

• Pro: Multiple trustees can lawfully possess the NFA item, because each cleared responsible person enjoys joint possession rights.
• Pro: The entity survives the grantor’s death, because trust assets transfer outside probate under most state laws.
• Pro: Estate planning becomes simpler, because heirs receive NFA items via Form 5 tax-free under 26 U.S.C. § 5852.
• Pro: You can add or remove responsible persons later, because trust amendments handle changes flexibly.
• Pro: A well-drafted trust protects against accidental constructive transfer, because authorized users avoid criminal exposure under 26 U.S.C. § 5861.
• Con: Every responsible person must file Form 23, because 41F closed the old trust loophole.
• Con: Fingerprint and photo costs multiply with each trustee, because each human needs original FD-258 cards and a current photo.
• Con: CLEO notification spans multiple jurisdictions if trustees live apart, because each trustee’s local CLEO must receive a copy.
• Con: Trust drafting costs $200–$1,000, because most gun owners need an attorney or a specialized service.
• Con: Errors compound across multiple Form 23 packets, because one missing signature delays every trustee.

Submission Channels and Timing

You can file Form 23 on paper or through ATF eForms. The eForms portal launched its modern version in late 2021 and now handles the majority of NFA applications.

The consequence of choosing paper is delay. Current 2026 processing data shows paper Form 4 packets averaging 9–12 months, while eForms Form 4 packets average 30–90 days.

A common misconception is that eForms still requires mailed fingerprint cards. The current portal accepts EFT (electronic fingerprint transmission) files in .EFT format from certified Live Scan vendors, eliminating paper FD-258s for digital filings.

Aisha, a Florida trust grantor, used Silencer Shop’s eForm kiosk to generate EFT files for herself and her co-trustee. Both Form 23s and the Form 4 cleared in 19 days without any paper at all.

Key Entities and Roles

Several federal and private entities touch every Form 23 packet.

The Bureau of Alcohol, Tobacco, Firearms and Explosives processes the form through its NFA Division in Martinsburg, West Virginia. The FBI runs NICS background checks on each responsible person. The Chief Law Enforcement Officer receives the courtesy copy and confirms residence jurisdiction.

The consequence of confusing these roles is wasted effort. The CLEO has no approval power, the FBI never receives Form 23 directly, and the ATF is the only agency that can approve or deny the application.

A common mistake is mailing Form 23 to the FBI or to the ATF Washington headquarters. The correct address is the ATF NFA Division in Martinsburg.

Court Rulings Shaping Form 23

Several federal cases shape how the ATF reads Form 23 answers.

United States v. Thompson/Center Arms Co., 504 U.S. 505 (1992), controls how “make” is defined under the NFA and informs Form 1 filings that ride with Form 23. Abramski v. United States, 573 U.S. 169 (2014), controls straw-purchaser rules and applies by analogy to false statements in Block 14 of Form 23. New York State Rifle & Pistol Association v. Bruen, 597 U.S. 1 (2022), did not strike down the NFA but invited new challenges to NFA registration that are still pending in lower courts as of 2026.

The consequence of these rulings is a stable but contested framework. Form 23 remains required under current law, and filers should comply fully while litigation continues.

A common misconception is that Bruen invalidated suppressor registration. It did not, and the ATF continues to enforce Form 23 in every federal district.

State Nuances to Watch

Federal law sets the floor, and state law adds friction. California prohibits suppressors entirely under Penal Code 33410, so Form 23 filings for suppressors will not pass state-level review even if the ATF approves them. New York bans most NFA items under the SAFE Act, and Form 23 packets from New York residents face additional state denial layers.

Texas explicitly allows NFA items under Penal Code 46.05 with federal registration, and Texas CLEOs generally process Form 23 copies without friction. Florida law similarly permits NFA items under Statute 790.221 with federal registration.

The consequence of ignoring state law is criminal exposure even after ATF approval. A California resident with an ATF-stamped suppressor still commits a state felony for possession.

Mike, a San Diego trust grantor, received ATF approval on a suppressor Form 4 in 2024. California prosecutors charged him under Penal Code 33410 within six months, because federal approval does not preempt state bans.

FAQs

Do I need a separate ATF Form 23 for each trustee?

Yes. Every responsible person with present authority over the trust must file an individual Form 23 with fingerprints, photo, and CLEO notification under 27 CFR 479.63.

Can a minor be a responsible person on Form 23?

No. A person under 21 cannot lawfully possess most NFA items under 18 U.S.C. § 922(b)(1), so minors should not be listed as responsible persons on entity filings.

Is notarization required on ATF Form 23?

No. ATF rules do not require notarization for Form 23. A signature under penalty of perjury in Block 15 satisfies the federal certification requirement.

Do beneficiaries of a gun trust need to file Form 23?

No. Beneficiaries with only future contingent rights do not file Form 23, because they lack present authority to direct the trust under 27 CFR 479.11.

Can a convicted felon file ATF Form 23?

No. Federal law under 18 U.S.C. § 922(g)(1) bars felons from possessing firearms, and a felon listed as a responsible person triggers automatic denial of the entire application.

Does a medical marijuana card disqualify me from Form 23?

Yes. ATF treats any marijuana use, including state-legal medical use, as a federal prohibitor under 18 U.S.C. § 922(g)(3), and Form 23 question 14e must be answered “yes.”

Can I file ATF Form 23 electronically?

Yes. The ATF eForms portal accepts Form 23 as part of Form 1, 4, and 5 packets, with EFT fingerprint files and digital photos reducing processing time to 30–90 days.

What happens if my Form 23 is rejected?

No approval issues, but you lose your place in queue. The ATF returns the packet with a deficiency notice, and you must correct errors and resubmit, restarting the processing clock.

Do I need to update Form 23 if a new trustee joins later?

Yes. The new trustee must file Form 23 before possessing the NFA item, because joining a trust mid-stream creates present authority under 27 CFR 479.11.

Is the CLEO copy of Form 23 confidential?

No. The CLEO copy is a courtesy notification under 27 CFR 479.85, and the CLEO may keep or share it under state public-records laws, though most agencies treat it as law enforcement sensitive.