What Is a Special Occupational Taxpayer (SOT) Dealer?

A Special Occupational Taxpayer, or SOT, dealer is a federal firearms licensee who pays an annual tax to the Bureau of Alcohol, Tobacco, Firearms and Explosives for the privilege of dealing in items regulated under the National Firearms Act: machine guns, suppressors, short-barreled rifles and shotguns, destructive devices, and a handful of other categories.¹ SOT status is not a standalone license. It is a tax classification that sits on top of an existing Federal Firearms License (FFL), and it has to be renewed every year.

The tax period runs July 1 through June 30, and payment is due on or before July 1.² Once you pay, ATF issues a Special Tax Stamp (Form 5630.6A) as proof for each business location.³

The Three SOT Classes

People often use “Class 3 dealer” as shorthand for any SOT. That’s not quite right. Class 3 is one of three classes, and it applies specifically to retail dealers. Each class requires a matching FFL type underneath it.

Class 1 (Importer). For importing NFA firearms. Requires a Type 08 FFL for firearms other than destructive devices, or a Type 11 for destructive devices.⁴
Class 2 (Manufacturer). For manufacturing NFA items. Requires a Type 07 or Type 10 FFL. Class 2 holders can both manufacture and deal, which makes it the most versatile classification.⁴
Class 3 (Dealer). For retail dealing in NFA firearms. Requires a Type 01, Type 02 (pawnbroker), or Type 09 FFL. This is the common classification for shops that sell suppressors and short-barreled rifles.⁴

What NFA Items an SOT Can Handle

The National Firearms Act defines the covered categories under 26 U.S.C. 5845: machine guns, silencers (suppressors), short-barreled rifles with barrels under 16 inches, short-barreled shotguns with barrels under 18 inches, destructive devices, and “any other weapons,” a catch-all for concealable firearms like pen guns and smooth-bore pistols.⁵ Antique firearms and items ATF classifies as collector’s pieces unlikely to be used as weapons are excluded.

State law is a separate limiter. Roughly eight states prohibit civilian suppressor possession outright, and others restrict machine guns or short-barreled firearms. Verify what your state and locality actually allow before stocking anything.

How to Become an SOT Dealer

Get the Right FFL First

You cannot pay the SOT tax without a matching current FFL. A prospective Class 3 dealer needs at least a Type 01, which costs $200 to apply for and $90 to renew every three years.⁴ A prospective Class 2 needs a Type 07 ($150 application, $150 renewal). FFL applications go through ATF’s Federal Firearms Licensing Center and include a background check, an interview, and a premises inspection.

File Form 5630.7 and Pay the Tax

Once your FFL is in hand, you file ATF Form 5630.7 (Special Tax Registration and Return) and pay the annual tax.³ Submission and payment run through Pay.gov.⁶ The current rates:

Class 3 (Dealer): $500 per year.
Class 1 (Importer) and Class 2 (Manufacturer): $1,000 per year, reduced to $500 if the business’s gross receipts for the most recent taxable year were under $500,000.⁷

A detail that catches multi-entity operations off guard: if your company sits inside a controlled group as defined under the Internal Revenue Code, the reduced Class 1 or Class 2 rate applies only when the entire group’s combined gross receipts fall below $500,000.³

Multiple Locations

Each business premises needs its own SOT tax payment. You can file a single Form 5630.7 for all locations, but the tax is multiplied by the number of premises, and ATF issues a separate Special Tax Stamp for each.³ You also attach a sheet listing the name, trade name, address, and FFL number for every additional location.

The 2026 Transfer Tax Change

Effective January 1, 2026, federal legislation restructured the NFA transfer tax. Under the amended 26 U.S.C. 5811, the $200 transfer tax now applies only to machine guns and destructive devices. For every other NFA firearm, including suppressors, short-barreled rifles, short-barreled shotguns, and any-other-weapons, the transfer tax is $0.⁸

The registration requirement did not change. Buyers still complete ATF Form 4, still go through the background check, and still wait for ATF approval before taking possession. Only the tax on most transfers went away. For SOT dealers, that generally means stronger demand at retail with unchanged compliance work behind every sale.

Machine Guns, Dealer Samples, and the Lapse Trap

Machine guns are where SOT dealing gets complicated. Federal law prohibits civilians from possessing machine guns manufactured after May 19, 1986.⁹ The only machine guns civilians can own are those lawfully registered before that cutoff, and because supply is fixed and shrinking, transferable pre-1986 machine guns routinely sell for tens of thousands of dollars.

SOT holders can possess post-cutoff machine guns as “dealer samples,” but the rules split sharply based on when the gun was made.

Pre-1986 Dealer Samples

These are machine guns manufactured or imported between 1968 and May 19, 1986, that entered the NFA registry during that window but were never transferred to a civilian. An SOT can acquire a pre-1986 dealer sample without a law enforcement demonstration letter, and can keep it even after surrendering SOT status.¹⁰ That retention right makes them more valuable and less risky to stock.

Post-1986 Dealer Samples

Post-1986 dealer samples are machine guns made or imported after May 19, 1986. Acquiring one requires a “law letter”: a written request from a law enforcement agency expressing interest in seeing or purchasing that specific model. The letter must be on agency letterhead, signed by the agency head or an authorized delegate, dated within one year of the transfer application, and identify the particular make and model.¹¹

Here is the trap. If your SOT status lapses or you discontinue your FFL, you cannot keep post-1986 dealer samples. They have to be transferred out of your inventory before your license expires, and the only lawful recipients are other current SOT holders or government agencies.¹² What was legal inventory one day becomes illegal possession of a machine gun the next, carrying penalties of up to $10,000 in fines and 10 years in federal prison.¹³

Transferring NFA Items

NFA transfers use specific ATF forms depending on who is sending and who is receiving. Using the wrong one delays the transfer and can create registration problems that take months to unwind.

Form 3: tax-exempt transfer between two FFL/SOTs.
Form 4: transfer to a non-licensee (individual or trust). The $200 tax still applies for machine guns and destructive devices; $0 for everything else.⁸
Form 5: tax-exempt transfer to government agencies or to lawful heirs from an estate.¹⁴

Recordkeeping and Security

SOT dealers carry the same recordkeeping obligations as any FFL holder, plus NFA registration tracking. Every firearm acquisition and disposition goes in a bound Acquisition and Disposition book. Every retail sale to a non-licensee needs a completed ATF Form 4473. Every NFA item also has to appear in the National Firearms Registration and Transfer Record.

Federal law does not mandate a specific safe or vault, but ATF guidance recommends removing firearms from display cases overnight into a reinforced vault, installing burglar bars or security gates on windows and doors, placing concrete-filled posts outside the building to prevent vehicle-ramming, and conducting a full physical inventory at least once a year.¹⁵ Given the value of NFA inventory and the severity of penalties for lost or stolen registered weapons, most experienced SOT dealers treat those recommendations as requirements.

What Non-Compliance Costs

NFA violations are federal felonies. Any violation of any provision of the NFA can bring a fine of up to $10,000, up to 10 years in prison, or both.¹³ Common triggers include possessing an unregistered NFA firearm, transferring an NFA item without ATF approval, and failing to pay applicable taxes. For SOT dealers specifically, the most common path to a serious problem is letting the annual SOT status lapse while post-1986 dealer samples are still sitting in the vault.

Budgeting for an SOT Business

The SOT tax is one line item on a longer list. A realistic annual budget factors in the underlying FFL renewal (from $90 to $3,000 every three years depending on type), the SOT tax itself ($500 or $1,000), general liability insurance (typically $1,000 to $3,000 or more per year for NFA-focused shops), and any local zoning or special-use permits. Multiple locations multiply the SOT tax accordingly. If the business handles exports of defense articles, a separate registration with the State Department’s Directorate of Defense Trade Controls applies under the International Traffic in Arms Regulations, with its own annual fee schedule.¹⁶ Most domestic-only SOT dealers do not need ITAR registration, but it is worth knowing the requirement exists before the first international inquiry arrives.

1
Congress.gov. The National Firearms Act and PL 119-21 – Issues for Congress
2
Office of the Law Revision Counsel. 26 USC 5802 – Registration of Importers, Manufacturers, and Dealers
3
Bureau of Alcohol, Tobacco, Firearms and Explosives. Instructions for Form 5630.7, Special Tax Registration and Return Firearms
4
Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Firearms Licenses
5
Office of the Law Revision Counsel. 26 USC 5845 – Definitions
6
Pay.gov. ATF Form 5630.7 – Special Tax Registration and Return National Firearms Act
7
eCFR. 27 CFR Part 479 Subpart D – Special (Occupational) Taxes
8
Office of the Law Revision Counsel. 26 USC 5811 – Transfer Tax
9
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
10
Bureau of Alcohol, Tobacco, Firearms and Explosives. Ruling 1986-5 Machine Gun Samples Federal Firearms Licensees
11
Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Firearms Regulations Reference Guide – Post-1986 Machinegun Dealer Samples
12
Bureau of Alcohol, Tobacco, Firearms and Explosives. What Happens to Post-86 Dealer Sample Firearms When FFL SOT Discontinues Business
13
Office of the Law Revision Counsel. 26 USC 5871 – Penalties
14
Bureau of Alcohol, Tobacco, Firearms and Explosives. Federal Firearms Regulations Reference Guide – Transfers of NFA Firearms
15
Bureau of Alcohol, Tobacco, Firearms and Explosives. Learn About Firearms Safety and Security
16
DDTC Public Portal. Registration Payment