Suppressors are legal to own in Indiana, and the process runs entirely through federal law. Indiana suppressor laws add no state permit, registration, or waiting period on top of the National Firearms Act. You register with the ATF, pass a background check, and once approved, you can possess the suppressor in the state. As of January 1, 2026, the $200 federal tax stamp that had been required since 1934 is gone: the tax is now $0, though every other part of the NFA process remains in place.
What Indiana Requires on Top of Federal Law
Nothing. Indiana has no standalone suppressor statute. Suppressors fall under the state’s broader regulation of certain weapons in Title 35, Article 47, Chapter 5, which prohibits possession of machine guns but exempts anyone who possesses such items “under applicable federal statutes.”1Indiana General Assembly. Indiana Code Title 35, Article 47, Chapter 5, Section 35-47-5-10 – Applicability of Statutes Relating to Machine Guns Because suppressors are regulated federally under the NFA, an Indiana resident who completes the ATF process is lawfully covered.
Your compliance checklist is federal from start to finish. If your ATF application is approved and your suppressor is entered in the National Firearms Registration and Transfer Record, you are legal in Indiana.
How the Federal Registration Works
Every suppressor transfer goes through ATF Form 4. The applicant submits fingerprints, a passport-style photograph, and personal identification. The ATF then runs a background check that reaches deeper than a standard firearm purchase, drawing on federal, state, and local records. Until that approval comes back, the suppressor stays with the dealer.
Wait times have dropped substantially. As of February 2026, ATF eForm 4 applications filed by individuals averaged about 10 days for approval; trust applications averaged 26 days.2Bureau of Alcohol, Tobacco, Firearms and Explosives. Current Processing Times Paper submissions still take considerably longer, so file electronically.
After approval, you receive documentation confirming the suppressor is registered to you. The ATF requires you to keep that proof and make it available to an agent or investigator on request.3Bureau of Alcohol, Tobacco, Firearms and Explosives. NFA Handbook – Chapter 12: Recordkeeping Most owners carry a physical copy or a scan on their phone whenever the suppressor leaves the safe.
Individual Registration or an NFA Trust
You can register the suppressor to yourself or to an NFA trust. Individual registration is simpler and processes slightly faster. It works fine if you are buying a single suppressor for personal use and no one else will handle it without you present.
A trust becomes worthwhile when you want other adults to possess the suppressor legally on their own. Every trustee listed as a “responsible person” can possess trust-owned items independently. Without a trust, handing your suppressor to a spouse and leaving the room creates a legal gray area around constructive possession. With a trust, if that person is a named trustee, possession is clean.
Each responsible person on the trust must submit fingerprints, a photo, and a Responsible Person Questionnaire (ATF Form 5320.23) whenever the trust applies for a new NFA item. You can add or remove trustees through trust amendments without involving the ATF, though any newly added person will need to submit background check materials on the next acquisition. Beneficiaries who only hold future interests do not trigger background checks.
Trusts also make inheritance smoother. If an individual owner dies, heirs go through a separate transfer process. With a trust, a successor trustee can step in and continue operating under the existing structure.
Who Cannot Own a Suppressor
Federal law bars certain people from possessing any firearm, and suppressors count. Under 18 U.S.C. § 922, the prohibited categories include:
- Anyone convicted of, or under indictment for, a crime punishable by more than one year in prison
- Anyone convicted of a misdemeanor crime of domestic violence, or subject to a qualifying restraining order involving an intimate partner or child
- Anyone adjudicated as mentally defective or committed to a mental institution at age 16 or older
- Anyone who is an unlawful user of or addicted to a controlled substance
- Anyone discharged from the military under dishonorable conditions
- Anyone currently fleeing from justice
- Anyone who has renounced U.S. citizenship
- Anyone in the U.S. illegally or on a nonimmigrant visa, with limited exceptions
These disqualifications are checked during the ATF background review, and they apply at all times. If your status changes after you take possession, continued possession becomes a federal crime.4Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts
Penalties for Skipping the Process
In Indiana, possessing a machine gun or similar regulated weapon without complying with federal law is a Level 5 felony.5Indiana General Assembly. Indiana Code Title 35, Section 35-47-5-8 A Level 5 felony carries one to six years in prison, with an advisory sentence of three years, plus a possible fine of up to $10,000.6Indiana General Assembly. Indiana Code 35-50-2-6 – Class C Felony, Level 5 Felony The advisory sentence is what a judge uses as a starting point before weighing aggravating or mitigating factors.
Federal penalties run heavier. Under 26 U.S.C. § 5871, anyone who violates the NFA faces up to ten years in prison and a fine of up to $10,000.7Office of the Law Revision Counsel. 26 U.S. Code 5871 – Penalties State and federal prosecutors can bring charges independently for the same conduct, so one unregistered suppressor can produce two criminal cases.
Traveling With a Suppressor
Suppressors are not listed in 18 U.S.C. § 922(a)(4) alongside machine guns, short-barreled rifles, and short-barreled shotguns as items requiring prior ATF authorization for interstate transport.4Office of the Law Revision Counsel. 18 U.S. Code 922 – Unlawful Acts You do not need to file ATF Form 5320.20 before crossing state lines with one.
The destination state’s law still applies, though. Several states ban civilian suppressor possession outright, and bringing a registered suppressor into one of those states is a crime there regardless of your Indiana registration. Before any interstate trip, confirm that every state on your route and your destination state allow civilian possession.
Passing a Suppressor to an Heir
Suppressors can be inherited, and the transfer is tax-exempt. The heir or estate beneficiary uses ATF Form 5 instead of Form 4, and no transfer tax applies.8Bureau of Alcohol, Tobacco, Firearms and Explosives. Application for Tax Exempt Transfer and Registration of Firearm The background check and approval process still apply.
During probate, the executor is responsible for maintaining custody and control of any registered NFA items in the estate. The ATF allows a reasonable time to arrange transfer, and it should generally happen before probate closes.9Bureau of Alcohol, Tobacco, Firearms and Explosives. Transfers of National Firearms Act Firearms in Decedents’ Estates The executor cannot hand the suppressor to a dealer for consignment or safekeeping, because that would itself be a transfer subject to NFA rules.
If the estate contains an unregistered suppressor, the situation is more serious. Unregistered NFA items are contraband and cannot be registered after the fact. The executor should contact the local ATF office to arrange abandonment.9Bureau of Alcohol, Tobacco, Firearms and Explosives. Transfers of National Firearms Act Firearms in Decedents’ Estates Trying to register or transfer an unregistered suppressor from an estate can expose the executor to federal liability.