What Is an ATF Form 4? NFA Firearm Transfer Explained

ATF Form 4 is the federal application you file to legally buy or receive a firearm regulated under the National Firearms Act. Formally titled the Application for Tax Paid Transfer and Registration of Firearm (ATF Form 5320.4), it pairs a $200 excise tax with a background check and ATF approval before you can take possession of a suppressor, short-barreled rifle, machine gun, or other restricted weapon.¹ Every approved Form 4 gets entered into the National Firearms Registration and Transfer Record, the federal government’s central registry of NFA firearms.²

Which Firearms Require a Form 4

The National Firearms Act defines the specific weapon categories that fall under Form 4 registration. If a firearm fits one of these definitions under 26 U.S.C. § 5845, transferring it without ATF approval is a federal crime.³

Suppressors (silencers), the single most commonly transferred NFA item. Any device designed to muffle the sound of a gunshot requires registration.
Short-barreled rifles, meaning a rifle with a barrel under 16 inches or an overall length under 26 inches.
Short-barreled shotguns, meaning a shotgun with a barrel under 18 inches or an overall length under 26 inches.
Machine guns, meaning any weapon that fires more than one shot per trigger pull. Federal law prohibits civilians from acquiring machine guns manufactured after May 19, 1986, so only pre-ban registered guns can be transferred on a Form 4.⁴
Destructive devices, meaning weapons with a bore diameter over half an inch (excluding sporting shotguns) and explosive ordnance like grenades and rockets.
Any Other Weapons (AOWs), a catch-all for concealable oddities like pen guns and smooth-bore pistols designed to fire shotgun shells. AOWs carry a lower transfer tax than other categories.

The 1986 machine gun cutoff catches people off guard. The Firearm Owners’ Protection Act closed the civilian registry, so the only transferable machine guns are those a civilian lawfully possessed before the ban.⁵ That fixed supply is why transferable machine guns routinely sell for tens of thousands of dollars.

The $200 Tax and the Stamp

Every Form 4 submission requires paying a one-time federal excise tax before the ATF will process the application. The rate is $200 for most NFA firearms and $5 for items classified as Any Other Weapons.⁶

When the ATF approves your application, it affixes an adhesive stamp marked “National Firearms Act” to your original Form 4 and cancels it. That stamped form is your proof of legal registration and is tied to the specific serial number of the firearm.⁷ Keep the approved form indefinitely. You must make it available to any ATF officer who asks to see it, and losing it creates a serious headache: replacement means writing to the NFA Division and waiting for a certified copy.

Tax-Exempt Transfers

Not every NFA transfer requires the $200 tax. If you inherit a registered NFA firearm, the executor of the estate can transfer it to you tax-free using ATF Form 5 instead of Form 4.⁸ Transfers to and from government agencies are also tax-exempt. If an estate transfers the item to someone who is not a lawful heir or beneficiary, the standard Form 4 and $200 tax apply.

Filing as an Individual or Through a Trust

You can file Form 4 either as an individual or through a legal entity, most commonly a gun trust. The choice affects who can legally possess the item, how much paperwork you file, and what happens to the firearm after your death.

Register as an individual and only you can possess and use that NFA firearm. No one else in your household can access it unsupervised, even a spouse. If you hand it to someone at the range, you must be physically present and maintaining control. A trust solves this by naming co-trustees who can independently possess and transport the trust’s firearms without needing their own separate tax stamps.

The trade-off is paperwork. Every “responsible person” on the trust, meaning anyone who can direct the trust’s management, must individually complete ATF Form 5320.23, submit two fingerprint cards, and provide a passport-style photo.⁹ A trust with four responsible persons means four sets of fingerprints and four questionnaires alongside the Form 4 itself. Individual applicants skip that form entirely.

Trusts also help with estate planning. When the trust owner dies, the trust’s NFA items pass to successor trustees or beneficiaries through the trust document rather than through probate, which can simplify the Form 5 tax-exempt transfer process. Drafting a valid gun trust typically costs a few hundred dollars through a firearms attorney, and getting it right matters: a poorly drafted trust can list people as responsible persons who shouldn’t have access.

What the Application Requires

The statute requires the application to identify both parties to the transfer and describe the firearm in detail.¹⁰ In practice, you will need to provide:

Transferor information: the name and address of the licensed dealer or individual selling the item.
Transferee information: your full legal name, address, and (for individuals) date of birth, place of birth, and citizenship.
Firearm description: manufacturer, model, caliber or gauge, serial number, barrel length (for short-barreled rifles and shotguns), and overall length where applicable.¹¹
Fingerprints: two completed FBI fingerprint cards (Form FD-258).¹²
Photograph: a 2×2-inch front-facing photo taken within the past year, attached to the form.
CLEO notification: a copy of the form sent to your local chief law enforcement officer, typically the sheriff or police chief. The CLEO does not need to approve the transfer, but must receive notification as a matter of record.²

If you are filing through a trust or other legal entity, each responsible person also completes a separate Form 5320.23 with their own fingerprints and photograph.⁹ Missing or incomplete information is the most common reason for processing delays, so double-check every field before submitting.

How to Submit and How Long It Takes

You have two submission routes: the ATF’s eForms online portal or a traditional paper filing by mail.

eForms

The eForms system handles most Form 4 transfers today and processes dramatically faster than paper. You create an account on the ATF eForms site, fill out the application digitally, and pay the tax through pay.gov.¹³ If you have digital fingerprints in the EFT file format (an FBI-standard encrypted fingerprint file), you can upload them directly. If you only have physical fingerprint cards, you mail them to the ATF with a system-generated coversheet after submitting the electronic application.²

Paper Filing

Paper applications go to the NFA Division at P.O. Box 5015, Portland, OR 97208-5015, along with your tax payment by credit card, debit card, or through pay.gov.¹⁴ Paper submissions take roughly two to three times longer to process than eForms.

Current Processing Times

Processing times have improved substantially in recent years. As of January 2026, average eForms processing for individual Form 4 applications was approximately 10 days, and trust applications averaged 11 days. Paper filings took 24 to 28 days on average.¹⁵ These numbers assume a correctly completed application. Errors or missing documents will add weeks or months to the timeline.

Background Check, Approval, and Denials

Once the ATF receives your application, the FBI runs a background check through the National Instant Criminal Background Check System (NICS) to verify you are not prohibited from possessing firearms under federal law.¹⁶ The check screens criminal history records, mental health adjudications, protective orders, and other disqualifying factors.

If the check comes back clean, the ATF approves the form, stamps it, and returns the original to the dealer who initiated the transfer. The dealer then contacts you for pickup. You cannot take possession of the item until that approved, stamped form is in hand.⁷

A “delayed” NICS result means the FBI needs more time to resolve a records hit. If the application is outright denied, you have the right to challenge the decision through the FBI’s administrative appeals process by submitting a NICS-related challenge at edo.cjis.gov.¹⁷ The FBI has 60 calendar days to respond with a final decision on whether to sustain or overturn the denial.

Possession, Storage, and Interstate Transport

If you registered an NFA firearm as an individual, you must maintain physical control over it at all times. Lending it to a friend or leaving it accessible to a family member when you are not present could be treated as an illegal transfer. Storing NFA items in a locked safe or a room with restricted access is strongly advisable, both to prevent unauthorized possession and to demonstrate reasonable care if the item is ever stolen. Trust ownership relaxes this restriction: named co-trustees can independently access, transport, and use the trust’s NFA firearms without the original registrant being present.

Owning a registered NFA firearm does not automatically let you carry it wherever you want. Federal law requires prior written ATF authorization before you transport a machine gun, short-barreled rifle, short-barreled shotgun, or destructive device across state lines.¹⁸ You obtain that authorization by filing ATF Form 5320.20 before your trip.¹⁹ Suppressors are not subject to this requirement. You can travel interstate with a registered suppressor without filing the transport form.

If you move permanently, you must notify the NFA Division in writing of your new address. The Form 4 instructions do not specify a deadline for this notification, but doing it promptly protects you if your registration details are ever questioned.²

State Law Still Applies

Federal ATF approval does not override state law. A handful of states outright ban certain NFA items regardless of whether the ATF would approve a Form 4. Suppressors are prohibited for civilian ownership in roughly eight states and the District of Columbia. Short-barreled rifles are banned in about six states. Machine guns face additional state-level restrictions in many jurisdictions beyond the federal 1986 cutoff. Verify that the specific NFA item is legal in your state before starting the Form 4 process. Paying the tax and waiting for ATF approval only to discover your state prohibits the item wastes time and money, and actually possessing it could result in state felony charges.

Penalties for NFA Violations

Possessing an unregistered NFA firearm, transferring one without ATF approval, or filing false information on a Form 4 are all federal crimes under 26 U.S.C. § 5861.²⁰ The penalties are severe: up to ten years in federal prison and a fine of up to $10,000 per violation.²¹ General federal sentencing provisions can push fines higher in practice. Federal prosecutors treat NFA violations seriously, and a conviction also permanently strips your right to possess any firearm.

1
eCFR. 27 CFR Part 479 Subpart F – Transfer Tax
2
Bureau of Alcohol, Tobacco, Firearms and Explosives. Application to Transfer and Register NFA Firearm (Tax-Paid) – ATF Form 5320.4
3
Office of the Law Revision Counsel. 26 USC 5845 – Definitions
4
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
5
Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act
6
Office of the Law Revision Counsel. 26 USC 5811 – Transfer Tax
7
eCFR. 27 CFR Part 479 Subpart F – Transfer Tax – Section 479.86
8
Bureau of Alcohol, Tobacco, Firearms and Explosives. Application for Tax Exempt Transfer and Registration of Firearm
9
Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act (NFA) Responsible Person Questionnaire
10
Office of the Law Revision Counsel. 26 USC 5812 – Transfers
11
eCFR. 27 CFR 479.84 – Application to Transfer
12
eCFR. 27 CFR 479.85 – Identification of Transferee
13
Bureau of Alcohol, Tobacco, Firearms and Explosives. eForms Applications
14
Bureau of Alcohol, Tobacco, Firearms and Explosives. New Mailing Addresses for Many ATF Registration Forms
15
Bureau of Alcohol, Tobacco, Firearms and Explosives. Current Processing Times
16
Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF and FBI Formalize Appeals Process for Certain National Firearms Act Applicants
17
Federal Bureau of Investigation. Challenges / Appeals
18
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts – Section 922(a)(4)
19
Bureau of Alcohol, Tobacco, Firearms and Explosives. Application to Transport Interstate or to Temporarily Export Certain NFA Firearms
20
Office of the Law Revision Counsel. 26 USC 5861 – Prohibited Acts
21
GovInfo. 26 USC 5871 – Penalties