How to Apply for a Suppressor Tax Stamp: Form 4 and Form 1

To apply for a suppressor tax stamp, you file ATF Form 4 if you’re buying one from a dealer or ATF Form 1 if you’re building your own, submit fingerprints, a passport-style photo, and a notification to your local chief law enforcement officer, then wait for the ATF to run a background check and approve the registration. The tax itself is no longer a cost issue: as of January 1, 2026, the transfer and making taxes on suppressors dropped from $200 to $0.¹² The paperwork, fingerprints, background check, and wait for approval all still apply. Taking possession before the ATF approves your application is a federal felony carrying up to ten years in prison and a fine of up to $10,000.³

Confirm Your State Allows Suppressors

Federal approval does nothing for you if your state bans civilian ownership. Eight states and the District of Columbia prohibit it: California, Delaware, Hawaii, Illinois, Massachusetts, New Jersey, New York, and Rhode Island. The other 42 allow ownership, though some layer on their own permitting requirements. If you live in a banned jurisdiction, or your travel route runs through one, no ATF stamp changes that.

Who Can Apply

Federal law bars anyone prohibited from possessing a firearm under 18 U.S.C. § 922(g) from owning a suppressor. Disqualifiers include:

A felony conviction, or any crime punishable by more than a year in prison
A misdemeanor domestic violence conviction or an active restraining order involving an intimate partner or their child
Unlawful use of or addiction to a controlled substance, including marijuana even where state-legal
Involuntary commitment to a mental institution or an adjudication as mentally defective
A dishonorable discharge from any branch of the U.S. Armed Forces
Being in the country illegally or on most nonimmigrant visas
Renunciation of U.S. citizenship
Fugitive status

You must also be 21 to buy a suppressor from a dealer. Federal law permits someone 18 or older to receive one through a non-dealer transfer such as an inheritance.⁴

Decide How to Register: Individual, Trust, or Entity

Before filing, decide who will own the suppressor on paper. This choice controls who can legally handle it after approval.

Individual Registration

The simplest route. Only you can possess the suppressor. A spouse, adult child, or shooting partner cannot borrow it or have unsupervised access to it, even inside your own home. You submit one set of fingerprints, one photo, and one CLEO notification.

NFA Trust

A trust is a legal entity built to hold NFA items. Every trustee or responsible person listed on the trust can legally possess the suppressor independently, without you present. Families and shooting partners often prefer this. The cost is paperwork: each responsible person submits their own fingerprints, photo, completed ATF Form 5320.23 (Responsible Person Questionnaire), and separate CLEO notification, and each runs through an independent background check.⁵ Trust requirements vary by state, and many require notarization before the trust is legally effective.

Corporation or LLC

A corporation or LLC can register as owner and allow multiple responsible persons access, similar to a trust. Officers, directors, or members with authority over the entity’s policies each count as responsible persons and complete the same documentation and background checks. Corporate registration is generally more complex and expensive to maintain than a trust, with no meaningful advantage for most individual buyers.

What You’ll Need in the Packet

Form 4 and Form 1 use the same core documents. Assembling everything before you start avoids the most common problem: applications kicked back for missing items.

Fingerprints

Each applicant or responsible person submits two fingerprint cards on the FBI’s FD-258 form. You can use traditional ink-rolled cards or, if filing through eForms, upload an electronic fingerprint file in EFT format that meets FBI specifications.⁶ Many dealers and law enforcement offices offer fingerprinting for a modest fee. If you file electronically but use paper cards, you have 10 days after submission to mail them in with the cover letter the system generates.

Photograph

A 2-by-2-inch passport-style photograph showing a clear frontal view of your face, taken within one year of filing.⁵ Plain white or off-white background, no hat, no glasses. On eForms you upload a digital version.

CLEO Notification

Since the 2016 Rule 41F revision, you no longer need a signature from your local chief law enforcement officer. You send the CLEO a completed copy of your application as notification. The CLEO here is the head of the police department or sheriff’s office in the jurisdiction where you live.⁷ If you’re filing through a trust, each responsible person also sends a copy of their Form 5320.23 to the CLEO where they live. The CLEO cannot block the application, but you must certify on the federal form that the notification was sent.

Suppressor Details

Every application requires the serial number, manufacturer, model, caliber, and overall length. For a Form 4, your dealer supplies these. For a Form 1, you assign the serial number yourself. Wrong details are one of the most common reasons an application is sent back for correction.

Trust or Entity Documents

Trust applicants submit a complete copy of the trust with all schedules and amendments. Corporate or LLC applicants submit organizational documents. Every responsible person completes Form 5320.23.

Buying From a Dealer: The Form 4 Process

Most people acquire a suppressor by buying one from a licensed dealer, meaning a Federal Firearms Licensee with a Special Occupational Tax classification. You pick out the suppressor at the shop or through an online retailer that ships to a local dealer. The dealer initiates ATF Form 4 (Application for Tax Paid Transfer and Registration of Firearm) on your behalf, typically through the ATF eForms portal.⁸ The dealer creates a draft; you certify it through your own eForms account at eforms.atf.gov, using a username and PIN you set up. During certification you upload your photograph and either upload electronic fingerprints or indicate you’ll mail paper FD-258 cards.

Because the transfer tax is now $0, no payment is collected at submission.⁹ You still pay the dealer’s retail price for the suppressor. Once submitted, the ATF begins the background check. The suppressor stays with the dealer until approval. Touching it before then is illegal. Paper Form 4 filings are still accepted by mail to the ATF’s NFA Division in Martinsburg, West Virginia, but they take far longer and offer no practical advantage.

Building Your Own: The Form 1 Process

If you plan to build a suppressor, file ATF Form 1 (Application to Make and Register a Firearm) before you begin manufacturing. The making tax is also $0 as of January 1, 2026. Assembling parts into a functional suppressor before approval is the same federal felony as possessing an unregistered one.

Form 1 uses the same documentation as Form 4: fingerprints, photograph, CLEO notification, and personal identifying information. You assign the serial number, specify the caliber, and describe the device on the form. eForms is the practical filing method.¹⁰ Once approved, you engrave the suppressor with your name (or trust or entity name), city, and state, in characters at least 0.003 inches deep and readable without magnification.

Processing Times and Status Checks

The shift to eForms and the elimination of tax payment processing have compressed wait times sharply. As of early 2026, median eForms processing for Form 4 transfers runs about 4 days for individual applicants, 24 days for trusts, and 29 days for corporate entities. Volume fluctuates, and individual results range from 1 to 47 days. Paper applications still take considerably longer.

During the wait, the ATF runs your information through the FBI’s National Instant Criminal Background Check System (NICS).¹¹ If you filed through a trust or entity, every responsible person gets a separate background check. You can check status by calling the ATF’s NFA Branch at (304) 616-4500 with your name (or trust name), the suppressor’s serial number, and the transferor’s name ready.

When the ATF approves the form, the approved stamp appears on your Form 1 or Form 4. That stamped document is your proof of legal registration. Keep a copy accessible whenever the suppressor is in your possession or being transported.

If Your Application Is Denied

A denial almost always traces back to something flagged during the NICS check. If you believe the NICS result is wrong, you can file a Firearm Related Challenge through the FBI’s administrative appeals process using the NICS Transaction Number (NTN) from your denial.¹¹ The FBI reviews the challenge using the same procedures it applies to denied point-of-sale firearm purchases. That process only addresses the NICS result, not the ATF’s decision to disapprove the NFA application itself. If the problem is something other than a NICS flag, such as an incomplete form, the ATF will usually return the application for correction rather than issue a formal denial.

After Approval: Possession and Travel

Registration type controls who can lawfully handle the suppressor. If you registered as an individual, only you can possess it. Nobody else can shoot it at the range, store it, or take it hunting, not even your spouse. Unsupervised access by anyone else can create a constructive possession problem for them.

A trust addresses this by listing multiple responsible persons who each have independent legal authority to possess the item. Any trustee can borrow, transport, or store it without the original applicant present. Adding new trustees later requires updating the trust and, for each new responsible person, submitting fingerprints, a photo, Form 5320.23, and a CLEO notification before that person can legally take possession.⁷

Suppressors get a travel break that other NFA items don’t. Short-barreled rifles, short-barreled shotguns, and machine guns require ATF Form 5320.20 approval before crossing state lines. Suppressors are exempt. You can travel interstate with a registered suppressor without filing Form 5320.20 or notifying the ATF, provided your destination state allows possession. That caveat is where people get in trouble. Driving from Virginia to Pennsylvania is fine. Driving from Virginia to New York is a felony the moment you cross the line, no matter what your federal paperwork says. Plan routes to avoid banned states even for pass-through. For a permanent move to another state, the ATF recommends filing Form 5320.20 as a courtesy address-change notification, but it is not legally required for suppressors. In-state moves need no ATF notification.

Keep your approved form accessible whenever the suppressor is in use or transit. A digital copy on your phone works for eForms approvals. Producing the stamped form quickly if law enforcement asks can prevent a routine stop from turning into an evidence seizure while officers verify registration with the ATF.

1
Office of the Law Revision Counsel. 26 U.S.C. 5811 – Transfer Tax
2
Office of the Law Revision Counsel. 26 U.S.C. 5821 – Making Tax
3
Office of the Law Revision Counsel. 26 U.S.C. 5871 – Penalties
4
Office of the Law Revision Counsel. 18 U.S.C. 922 – Unlawful Acts
5
Bureau of Alcohol, Tobacco, Firearms and Explosives. NFA Responsible Person Questionnaire
6
Bureau of Alcohol, Tobacco, Firearms and Explosives. NFA Form 1 Submission External Guidance With Q and A
7
Bureau of Alcohol, Tobacco, Firearms and Explosives. Background Checks for Responsible Persons (Final Rule 41F)
8
eCFR. 27 CFR Part 479 Subpart F – Transfer Tax
9
Federal Register. Changes to National Firearms Act Tax Remittance Provisions
10
Bureau of Alcohol, Tobacco, Firearms and Explosives. Application to Make and Register NFA Firearm
11
Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF and FBI Formalize Appeals Process for Certain National Firearms Act Applicants