Federal law defines domestic terrorism but does not make it a crime by that name. That single fact drives most of what a defendant actually faces: domestic terrorism charges and penalties come from a stack of ordinary federal criminal statutes, applied to conduct that fits the definition in 18 U.S.C. § 2331, and then amplified at sentencing by a terrorism enhancement that can add more than a decade to a prison term. Understanding how the pieces fit together is the only way to make sense of why two defendants accused of similar attacks can be charged under completely different statutes and end up with wildly different sentences.
Why No Single “Domestic Terrorism” Charge Exists
You cannot be charged with “domestic terrorism” the way you can be charged with bank robbery. The definition in 18 U.S.C. § 2331 is a classification tool. It tells the FBI what qualifies as domestic terrorism for investigative purposes, triggers certain sentencing enhancements after conviction, and authorizes asset forfeiture. It does not, by itself, make any conduct illegal.
Congress has debated creating a standalone charge repeatedly. Proposals have stalled over concerns that such a law could be used against political protest or disfavored speech. As of 2026, none has been enacted. The result is a system where prosecutors handling international terrorism cases have a purpose-built toolkit and prosecutors handling domestic cases must assemble one from general criminal statutes.
The Charges Prosecutors Actually Bring
Without a standalone offense, federal prosecutors identify every federal crime the conduct violated and charge them together. The specific statutes vary with the facts, but a handful appear again and again.
Explosives and arson (18 U.S.C. § 844). Bombing or setting fire to government property carries 5 to 20 years. If someone is injured, the range is 7 to 40 years. If someone dies, the penalty is 20 years to life, and the death penalty is on the table.
Weapons of mass destruction (18 U.S.C. § 2332a). Using or attempting to use a chemical, biological, radiological, or explosive weapon against people or property is a federal crime with no foreign-connection requirement.
Material support (18 U.S.C. § 2339A). Providing money, weapons, training, safe houses, false identification, or other resources knowing they will be used to carry out specific violent federal crimes carries up to 15 years, or life if a death results. Unlike its companion statute, § 2339B, this provision does not require any connection to a foreign terrorist organization and applies to purely domestic conduct.
Conspiracy (18 U.S.C. § 371 and related statutes). When multiple people plan an attack together, conspiracy charges let prosecutors hold every participant accountable for the group’s plan, even if one person did not personally carry out the violence.
Firearms offenses. Illegal possession, use of a firearm during a violent crime, or trafficking frequently ride along with the more serious counts and add mandatory consecutive prison time.
Prosecutors routinely combine several of these in a single indictment. The stacking matters because each conviction carries its own sentence, and federal sentences for violent offenses often run consecutively rather than concurrently.
The Terrorism Sentencing Enhancement
The “terrorism” label does not disappear because there is no matching charge. It reappears at sentencing. Under U.S. Sentencing Guidelines § 3A1.4, a judge can apply a terrorism enhancement when the offense of conviction qualifies as a “federal crime of terrorism.” That term is defined in 18 U.S.C. § 2332b(g)(5) as an offense from a specific list of predicate crimes that was “calculated to influence or affect the conduct of government by intimidation or coercion, or to retaliate against government conduct.”
The enhancement does two things. It raises the defendant’s offense level by 12 points, with a floor of level 32. And it automatically places the defendant in Criminal History Category VI, the highest category, regardless of whether the person has any prior record at all. At offense level 32 and Category VI, the guidelines recommend roughly 17.5 to nearly 22 years in prison before any other adjustments. When the base offense level is already high, the 12-level bump can push the recommended sentence far higher.
This is where the § 2331 definition does its real work. Prosecutors point to it to argue that the underlying conduct meets the § 2332b(g)(5) standard, and the enhancement follows.
What Counts as Domestic Terrorism in the First Place
Under 18 U.S.C. § 2331, an activity qualifies as domestic terrorism when three elements are all present.
The conduct must endanger human life and break federal or state criminal law. A bombing, shooting, or arson that already violates a criminal statute satisfies this element. The terrorism characterization adds a layer to conduct that is separately illegal.
The conduct must appear intended to serve one of three goals: frightening a civilian population into compliance, pressuring a government to change policy through intimidation, or disrupting government operations through mass destruction, assassination, or kidnapping. This is the element that separates domestic terrorism from ordinary violent crime. A mass shooting driven by a personal grudge is not domestic terrorism; one carried out to coerce political change may be.
And the activity must take place primarily inside U.S. territory. Conduct that crosses national borders or targets people abroad falls under the separate definition of international terrorism in the same statute.
How This Differs From International Terrorism Cases
The distinction is not academic. International terrorism prosecutions can rely on 18 U.S.C. § 2339B, which makes it a federal crime to provide money, weapons, training, or other resources to a group the State Department has designated a foreign terrorist organization under 8 U.S.C. § 1189. That single charge carries up to 20 years, or life if someone dies, and the government does not have to prove the defendant knew how the resources would be used.
No federal mechanism exists to designate a purely domestic group as a terrorist organization. Someone who donates money to a designated foreign group can be prosecuted for the donation itself. Someone who donates to a domestic extremist group can only be prosecuted under § 2339A, and only if the government proves the donor knew the money would be used for a specific listed crime. The knowledge-and-intent showing is harder to make, and the available penalties are somewhat lower.
Consequences Beyond Prison
A conviction tied to terrorism carries restrictions that outlast the sentence.
Asset Forfeiture
Under 18 U.S.C. § 981, the government can seize any property belonging to a person who planned or carried out a federal crime of terrorism. Forfeiture reaches assets used to support, plan, or conceal the crime and anything derived from it. Title technically vests in the government at the moment the crime is committed, though a warrant is still generally required to actually seize the property.
No Fly List
The FBI is the sole agency that nominates people with a domestic terrorism nexus to the federal terrorist watchlist, which includes the No Fly List. Placement requires “reasonable suspicion” that the individual is engaged in, has been engaged in, or intends to engage in terrorism. A listed person cannot board any flight arriving in, departing from, or flying over U.S. airspace. Challenging placement runs through a multi-stage redress process ending with the TSA Administrator, and removal is rare.
Firearms Ban
Federal law bars anyone convicted of a felony punishable by more than one year in prison from possessing firearms. Because terrorism-related offenses are serious felonies, conviction functions as a lifetime gun ban. A 2025 proposed federal rule would further restrict the ability of people convicted of terrorism-related conduct to apply for relief from this firearms disability.
State Charges on Top of Federal
Roughly two-thirds of states and the District of Columbia have enacted standalone domestic terrorism criminal offenses. Definitions and penalties vary. Some closely mirror the federal definition, requiring violence intended to intimidate civilians or coerce government policy. Others are narrower, focused on specific conduct like placing explosives near critical infrastructure. State prosecutors can bring their own charges independently, and a single act of domestic terrorism can produce parallel state and federal cases without violating double jeopardy protections. For a defendant, that means the federal stack described above is sometimes only half the exposure.