How to File an eForm 4 (Step-by-Step)

An eForm 4 is the application that registers an existing NFA item to a new owner. Walk into a dealer, pay for a suppressor, sign the paperwork, wait for approval, come back and pick it up: that whole sequence runs on a Form 4. Unlike the Form 1, which an applicant fills out alone, the Form 4 is dealer-driven. The dealer prepares the form, links it to the applicant's eForms account, and submits it after the applicant certifies. The applicant's role is to prepare the right materials up front, verify the dealer's data carefully when it comes back to review, and certify at the right time and in the right place.

As of January 1, 2026, the transfer tax is $0 for suppressors, SBRs, SBSs, and AOWs. Machine guns still carry the $200 tax. The dollar amount changed; everything else about the process, including the background check, the biometric submission, and the federal registry, is unchanged.

What the dealer does, and what you do

The Form 4 is a back-and-forth between the dealer and the applicant. Most of the data entry is the dealer's. Almost all of the rejections come from things the applicant either prepared incorrectly or did not catch on review.

The dealer is responsible for:

Taking physical possession of the item before any portal work begins.
Creating an "assignment" that links the item's serial number to the applicant's eForms account, using the applicant's registered email address.
Drafting the form fields: applicant info, line item, transferor info, certifications.
Initiating the certification session, in-person or remote.
Submitting the form after the applicant signs.

The applicant is responsible for:

Holding an eforms.atf.gov account with a UserID and 4-digit PIN before the visit.
Providing an EFT fingerprint file (or, for a trust, one per responsible person).
Providing a passport-style digital photo.
Providing trust documents and Form 5320.23 questionnaires for any responsible person, when filing as a trust.
Reviewing the dealer's draft for biographic and line-item errors before signing.
Certifying the form; both individual and trust filers may certify remotely.

A Form 4 rejected ten days after submission for a typo in the serial number is a Form 4 that has to start over from scratch. The few minutes of review in the middle are the most important minutes the applicant spends on the entire process.

What to gather before you walk into the shop

Bring or upload the following before the dealer starts the form. A complete prep packet is the difference between a thirty-minute counter visit and a multi-trip back-and-forth.

An eForms account at eforms.atf.gov with a UserID and a 4-digit PIN. The PIN acts as your digital signature later in the process and cannot be reset without the security questions you set at registration.
The exact email address registered to your eForms account. The dealer uses it to create the assignment. If the email at the dealer does not match the email on the eForms account, the assignment cannot link to the right account, and the form sits in limbo.
An EFT fingerprint file. The paper FD-258 route is technically allowed, but mailing two cards adds at least ten days to processing and reintroduces failure modes the electronic file avoids. See: How to convert an FD-258 fingerprint card to an EFT file at home.
A passport-style digital photo taken in the last six months. JPG or JPEG, under 3 MB, solid light background, no hats or sunglasses.
For a trust filing: the full notarized trust document including Schedule A (property listed in the trust) and Schedule B (responsible persons), scanned to a single PDF under 30 MB.
For a trust filing: a completed Form 5320.23 Responsible Person Questionnaire (RPQ) for every responsible person, signed in wet ink and scanned as a PDF.
A government-issued photo ID with the applicant's current address.

A note on browsers

The eForms portal is a finicky web application. Firefox is the most reliable browser for the certification step. Edge handles modern scripts and renders the Sign-and-Submit modal cleanly. Chrome occasionally drops characters in text fields. Safari fails at the certification step often enough to be unusable for it; the modal that confirms the submission frequently does not render. If certifying remotely from home, use a desktop browser.

Individual or trust: What changes about your filing

Both filings carry $0 tax for qualifying items in 2026. The administrative path diverges in two important places.

Individual. One applicant, one EFT file, one photo, one SSN. Federal law restricts possession to the applicant alone. Anyone else who handles the item without the owner physically present is in possession of an unregistered NFA firearm under federal law. Individual filers can certify remotely. The ATF removed the in-person certification requirement in June 2022; the individual process is now identical to the trust process. The dealer initiates the session and the applicant joins from any desktop browser to enter credentials.

Trust. Every individual listed as a responsible person in the trust has the same possession privileges as the trust itself. Each responsible person submits a passport photo, an EFT file, and a signed Form 5320.23. Trust filers certify remotely. The dealer initiates a synchronized session, and each responsible person joins from their own computer to enter credentials in real time.

A trust lets every responsible person possess and transport the item independently, without the owner present. The trust document is a one-time cost and reusable across every NFA submission afterward.

How the workflow actually moves

Pre-certify: the dealer assignment

Once the dealer has the item physically in inventory, they assign it to the applicant in their internal system. The assignment uses the applicant's email address to link the serial number to the correct eForms account. If the email does not match, the assignment never reaches the applicant: a state sometimes called the "ghost form." Confirm the email with the dealer before they kick off the assignment.

Ready to Prepare: the dealer drafts the form

In this stage the dealer enters the firearm specifications (manufacturer, model, caliber, serial number) and drafts the applicant's biographic data, pulling from what the applicant provided at the counter or through the dealer's online intake.

Review and sign

When the draft is ready, the applicant receives a notification, often through DocuSign or a comparable signing service, to review the form before it moves to certification. This is the only point at which errors can be cheaply corrected. Once the form moves past this stage to "Ready to Certify," the data is locked, and a typo means restarting the entire assignment.

Three things to verify carefully:

Serial number, character by character. "1243" instead of "1234" results in a rejection ten days later.
Applicant name and address. Match against the government-issued ID exactly. "St." vs. "Street" is a documented cause of administrative rejection.
Trust name, if applicable. Copy from the trust PDF rather than retyping. Adding or omitting "The" or "Trust" trips the eForms validity check.

If anything is wrong, send corrections back to the dealer before signing. Asking for a fix here costs minutes; asking for one after submission costs the queue position.

Ready to Certify

After the applicant signs the review document, the form moves to "Ready to Certify." Both individual and trust filers certify remotely. The dealer initiates the session; the applicant joins from a desktop browser.

For the certification itself, both parties enter their UserID and PIN in the same active session. The portal acknowledges $0 with a payment screen that defaults to $0; the button still has to be clicked even when no money is owed. The reCAPTCHA, the PIN entry, and the Sign-and-Submit modal all render through that final session. A wired internet connection on the applicant's side keeps a remote session from timing out. If the session drops mid-certification, the dealer has to re-prepare the form, which is a 24-hour reset.

After you submit

The dealer and applicant both receive an automated confirmation email with a control number. Application status tracks on the eForms dashboard under "Submitted."

Like a Form 1, the eForm 4 generates a CLEO copy that the applicant must mail to the Chief Law Enforcement Officer (CLEO) for their city or county, usually the sheriff or chief of police. CLEO notification is not approval; the officer has no authority to block the application. It is a federal requirement, not a formality to skip. For a trust filing, every responsible person mails a copy to their respective CLEO.

Approval timeline depends on the FBI background check, which is the rate-limiting step in the post-tax era. Applicants who provided their SSN tend to clear background checks faster than applicants who did not, because the SSN lets the FBI immediately distinguish the applicant from other people with the same name. Including the SSN on the form is the most effective way to avoid manual review.

When approval lands, the approved Form 4 with the digital tax stamp is emailed to both the dealer and the applicant. The approved PDF is the document required at pickup. ATF emails frequently route to "Promotions" or "Spam" filters in Gmail and to the Junk folder in Outlook. Check those filters before assuming the application is still pending.

Understanding eForm statuses: what each stage means

The rejection triggers, ranked

Most rejections are administrative and could have been caught on the review step. In rough order of frequency:

Serial number typo. A transposed digit, a missed leading zero, a dash where there should not be one (or absent where there should be). The dealer typed it; the applicant has to catch it on review.
Biographic mismatches. Applicant name or address does not match the government ID exactly. Abbreviation differences are the usual culprit.
Trust name mismatch. A misspelled or differently-formatted trust name versus the trust document.
Missing trust schedules. Schedule A and Schedule B must be included in the uploaded PDF. The trust body alone is treated as incomplete.
Invalid photos. Hats, sunglasses, busy backgrounds, photos older than six months.
Inserted signatures on Form 5320.23. Typed names or image-pasted signatures instead of a scanned wet-ink original.
Wrong answer on a prohibited-person question. Usually a typo, usually unrecoverable.

The first one is uniquely a Form 4 problem because the dealer types the serial number, not the applicant. Two minutes verifying the line item on the review document saves more time than any other step in the workflow.

Picking up the item

Once the approval email arrives, the applicant returns to the dealer to take possession of the item.

Bring:

A printed or digital copy of the approved Form 4.
A government-issued photo ID with the address that matches the form.
Whatever payment method the dealer uses for the item itself. The firearm is paid for separately from the $0 tax stamp.

At the counter the dealer will:

Verify that the serial number on the firearm matches the approved form. The applicant should verify too. A mismatch caught at the counter is fixable; one caught at home is not.
Run a Form 4473 background check. The 4473 is a separate federal requirement from the NFA registration and is not waived by the eForm 4 approval. The 4473 background check runs through NICS just like any other firearm transfer.
Hand over the item.

If the applicant moved within the same state during the wait period, an in-state license with the current address is generally acceptable at pickup. Cross-state moves after submission complicate pickup and warrant a call to the dealer before driving out.

What this costs in 2026

Item	Cost
Tax stamp (suppressor, SBR, SBS, or AOW)	$0
Tax stamp (machine gun)	$200
The item itself	Whatever the dealer charges (the $0 tax does not change the suppressor's price)
Trust document (if applicable)	$50–$300 one-time, depending on whether the applicant uses a template service or an attorney. Reusable across every future NFA filing.
EFT file via SLAP & ROLL	$20 (Pay-As-You-Go). One file covers every Form 4 and Form 1 the applicant submits as long as the biographic data stays current. For a trust generating files for multiple responsible persons together, one month of Pro at $50 is cheaper than stacking Pay-As-You-Go.
Passport photo	$0 at home against a white wall, or a few dollars at a drugstore photo counter
FD-258 cards and ink	Under $20 from a law-enforcement supply vendor, only if rolling prints at home rather than using livescan

The fixed federal cost of a Form 4 in 2026 for a qualifying item is $0. The fixed applicant cost, separate from the price of the item, is the EFT file and a trust document if the applicant is filing through one.

How to convert an FD-258 fingerprint card to an EFT file at home