Class 3 Tax Stamp: Cost, How to Apply, and Wait Times

A Class 3 tax stamp is the everyday name for the federal registration that lets a civilian legally own a suppressor, short-barreled rifle, short-barreled shotgun, machine gun, destructive device, or “any other weapon” under the National Firearms Act of 1934. You get one by filing an application with the ATF, passing an FBI background check, and — until recently — paying a $200 tax. As of January 1, 2026, that tax is $0 for most NFA items. Registration itself is still mandatory.1Congress.gov. Public Law 119-21

What “Class 3” Actually Means

The name is a misnomer that stuck. “Class 3” refers to a dealer’s Special Occupational Tax status, not to the stamp a buyer receives.2Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act Division Buyers picked up the phrase because they purchased NFA items through Class 3 dealers, and the shorthand followed the transaction. What you’re actually receiving is a federal tax stamp proving your firearm is entered in the National Firearms Registration and Transfer Record. You are not applying for a “license” — you are registering a specific firearm to yourself or your trust.

Items That Require a Stamp

The NFA covers six categories, and each item you own needs its own stamp.

Federal registration does not override state law. Roughly eight states and the District of Columbia ban civilian suppressor ownership entirely, and several states restrict SBRs, SBSs, or machine guns. The ATF will approve a form even if your state prohibits the item, so confirm your state allows it before applying.

What It Costs in 2026

Public Law 119-21, signed on July 4, 2025, eliminated the transfer and making taxes for most NFA items effective January 1, 2026.1Congress.gov. Public Law 119-21

  • Suppressors, SBRs, SBSs, and AOWs: $0 transfer tax and $0 making tax.
  • Machine guns and destructive devices: $200 transfer tax and $200 making tax, unchanged.8Office of the Law Revision Counsel. 26 USC 5811 – Transfer Tax

The making tax under 26 U.S.C. § 5821 follows the same structure, so building your own suppressor or SBR on an approved Form 1 now carries no tax either.9Office of the Law Revision Counsel. 26 USC 5821 – Making Tax Everything else about the process — the forms, the background check, the wait — is identical to what it was when the tax was $200.

How to Apply

Which form you file depends on what you’re doing. Buying an NFA item from a dealer or transferring one from another private owner uses ATF Form 4. Building or converting your own uses ATF Form 1. Both require the item’s serial number, manufacturer, model, and caliber, and any error in those fields is a common reason for rejection.

Filing as an Individual vs. a Trust

You can register as an individual or through a legal entity like an NFA trust or corporation. As an individual, only you can legally possess the item. That’s simple, but it also means handing the firearm to a friend at the range while you step away creates a possession problem for that person.

A trust lets you list multiple “responsible persons” who are all authorized to possess and use the item. Professionally drafted NFA trusts generally cost between $60 and $100 through attorneys who specialize in firearms law. The tradeoff is paperwork: every responsible person must individually submit fingerprints and a passport-style photograph, and each one undergoes a background check.10Bureau of Alcohol, Tobacco, Firearms and Explosives. National Firearms Act Responsible Person Questionnaire Four responsible persons means four sets of fingerprints and four background checks for every item you register.

Documents You Submit

Every applicant (or every responsible person on a trust) submits:

  • Two completed FBI Form FD-258 fingerprint cards. Many local police departments, UPS stores, and private services will roll these for a small fee.
  • One 2×2-inch passport-style photograph taken within the past year.
  • A completed copy of the application mailed to your chief law enforcement officer (CLEO) — typically the local sheriff or police chief. This is notification only; the CLEO cannot block your application. Trust filers use ATF Form 5320.23 for each responsible person’s CLEO copy.11Bureau of Alcohol, Tobacco, Firearms and Explosives. Background Checks for Responsible Persons (Final Rule 41F)

Trust or corporate applicants also include the full trust document or articles of incorporation, plus any state or local firearms permit your jurisdiction requires. A proposed rule published in May 2026 would remove the CLEO notification requirement, but until it’s finalized the notification is still mandatory.

Where to Submit

The ATF eForms portal is the preferred submission method and handles Forms 1, 4, 5, 20, and several others.12Bureau of Alcohol, Tobacco, Firearms and Explosives. eForms Applications Paper submissions by mail are still accepted but generally take longer. Once the ATF receives the application, the FBI runs your background check through NICS.13Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF and FBI Formalize Appeals Process for Certain National Firearms Act Applicants

How Long the Wait Takes

Processing times have come down substantially from the year-long waits of a few years ago. The ATF’s most recently published averages:

  • Form 4 individual through eForms: about 10 days
  • Form 4 trust through eForms: about 26 days
  • Form 1 through eForms: about 36 days
  • Form 4 individual on paper: about 21 days
  • Form 4 trust on paper: about 24 days
14Bureau of Alcohol, Tobacco, Firearms and Explosives. Current Processing Times

These averages move with application volume, and any file that requires manual review runs longer. Approval produces a stamp — digital through eForms, physical through the mail — that is your proof of registration.

If You Get Denied

A NICS denial is not necessarily final. If the ATF disapproves your application because of the background check, the NFA Division sends a letter with your NICS Transaction Number and instructions for filing a Firearm Related Challenge with the FBI.13Bureau of Alcohol, Tobacco, Firearms and Explosives. ATF and FBI Formalize Appeals Process for Certain National Firearms Act Applicants That process challenges the background check itself, not the NFA application.

After the Stamp Is Approved

You have to keep your proof of registration and produce it for any ATF officer who asks.15eCFR. 27 CFR 479.101 – Registration of Firearms For eForms approvals, a digital copy on your phone works. For paper stamps, most owners store the original in a safe and carry a clear scan or photocopy with the item.

Crossing state lines with a machine gun, SBR, SBS, or destructive device requires advance ATF approval through Form 5320.20, which specifies your travel dates and destination.16Bureau of Alcohol, Tobacco, Firearms and Explosives. Application to Transport Interstate or Temporarily Export Certain NFA Firearms – ATF F 5320.20 The eForms portal averages about two days on these.14Bureau of Alcohol, Tobacco, Firearms and Explosives. Current Processing Times Suppressors and AOWs are exempt from this filing, though the destination state still has to allow the item.

Possession follows the registration. On an individual registration, only you can possess the item; leaving it accessible to someone unauthorized can create a constructive possession issue. A trust lets any listed responsible person possess the firearm. Either way, secure storage is how you keep the registration from becoming a criminal problem.

Penalties for Getting It Wrong

Federal law makes it illegal to possess an unregistered NFA firearm, to receive or transfer one outside the proper channels, to make a false statement on an application, or to alter or remove a serial number, among other prohibited acts.17Office of the Law Revision Counsel. 26 USC 5861 – Prohibited Acts Any violation carries a maximum penalty of 10 years in federal prison, a fine of up to $10,000, or both.18Office of the Law Revision Counsel. 26 USC 5871 – Penalties These are felony charges, and a paperwork mistake that results in possessing an unregistered item can trigger a federal investigation. The $0 tax removed a cost barrier in 2026, but it changed nothing about the registration requirement. Building a suppressor or SBR without an approved Form 1 is just as illegal now as it was when the tax was $200.