Accessory

By Elizabeth Franklin-Best, Esq., and Christopher Zoukis, JD, MBA

There is no federal crime called “accessory before the fact.” Congress abolished the category in 1909 and folded it into 18 U.S.C. § 2, which provides that anyone who “aids, abets, counsels, commands, induces or procures” a federal offense “is punishable as a principal.” If you helped before or during a federal crime, you are not facing a lesser charge. You are facing the same charge, with the same statutory maximum, as the person who committed it.

Help given after the offense is genuinely different. Accessory after the fact, 18 U.S.C. § 3, is a separate and lesser offense, punished by a formula: not more than one-half the maximum term of imprisonment prescribed for the principal, and not more than 15 years if the principal is punishable by life imprisonment or death. That before/after line is the single most consequential distinction on this page, and most sources describing “accessory” liability get it wrong by importing state-law categories that federal law discarded more than a century ago.

Four federal statutes do the work that the word “accessory” does loosely in ordinary speech, and they are not interchangeable. This page sets out all four, what the government must prove for each, how each is actually sentenced, and what a defense lawyer looks at first.

The four statutes, side by side

Every value below is from the current statutory text or the 2025 Guidelines Manual.

	18 U.S.C. § 2 — aiding and abetting	18 U.S.C. § 3 — accessory after the fact	18 U.S.C. § 4 — misprision of felony	18 U.S.C. § 371 — conspiracy
What the person did	Committed the offense, or “aids, abets, counsels, commands, induces or procures its commission”; or, under § 2(b), “willfully causes an act to be done” that would be an offense if he did it himself	“Receives, relieves, comforts or assists the offender”	“Conceals and does not as soon as possible make known” the felony to a judge or other civil or military authority	Agreed with at least one other person to commit a federal offense or to defraud the United States, and someone did an act to effect it
Timing relative to the underlying crime	Before or during. Liability attaches to facilitating the offense itself	After. The offense must already have been committed	After. Knowledge of “the actual commission of a felony”	Before, and continuing. The agreement is the offense; the crime agreed on never has to happen
Mental state required	An affirmative act in furtherance plus the intent to facilitate the offense’s commission — Rosemond v. United States, 572 U.S. 65 (2014)	Knowledge that a federal offense has been committed, and the purpose “to hinder or prevent his apprehension, trial or punishment”	Knowledge of the actual commission of a federal felony, plus an affirmative act of concealment	Knowing agreement, plus an overt act by any one conspirator
Is a completed underlying offense required?	Yes — but the principal’s acquittal does not bar the aider’s conviction: Standefer v. United States, 447 U.S. 10 (1980)	Yes. “Knowing that an offense against the United States has been committed”	Yes. “The actual commission of a felony cognizable by a court of the United States”	No. The object offense need never be completed
How it is punished	As a principal — the same statutory maximum as the underlying offense	Not more than one-half the principal’s maximum term; not more than one-half the maximum fine (notwithstanding § 3571); not more than 15 years if the principal is punishable by life or death	Fine, or not more than 3 years, or both	Fine, or not more than 5 years, or both — but capped at the object offense’s maximum if that offense is a misdemeanor only
Offense class	Same class as the underlying offense	Depends on the halved maximum	Class E felony (18 U.S.C. § 3559(a)(5))	Class D felony at the 5-year maximum
Guideline that applies	USSG §2X2.1 — “the same level as that for the underlying offense”	USSG §2X3.1 — 6 levels lower than the underlying offense; floor level 4; ceiling level 30, or 20 where the conduct is limited to harboring a fugitive	USSG §2X4.1 — 9 levels lower than the underlying offense; not less than 4, not more than 19	USSG §2X1.1 where no specific guideline covers the conspiracy — the substantive offense’s level, minus 3 unless the acts were substantially complete
Mitigating-role reduction available?	Yes — §2X2.1’s commentary says “An adjustment for a mitigating role (§3B1.2) may be applicable”	Normally no — §2X3.1 comment. (n.2): the adjustment “normally would not apply because an adjustment for reduced culpability is incorporated in the base offense level”	Normally no — §2X4.1 comment. (n.2), same reasoning	Yes, on the same terms as the substantive offense
Public text	law.cornell.edu/uscode/text/18/2	law.cornell.edu/uscode/text/18/3	law.cornell.edu/uscode/text/18/4	law.cornell.edu/uscode/text/18/371

The bottom two rows are where a real sentencing difference lives, and almost nothing written for a general audience mentions them. An aider and abettor is sentenced at the principal’s offense level but can argue for a minimal or minor participant reduction. An accessory after the fact starts six levels lower but normally cannot, because the Commission built the discount into the base level. Which side of the line the conduct falls on therefore changes the arithmetic twice.

Why “accessory before the fact” is not a federal charge

The common law divided participants into principals in the first degree, principals in the second degree, accessories before the fact, and accessories after the fact. The distinctions carried real procedural consequences: an accessory before the fact often could not be tried before the principal was convicted.

Congress swept that away. In Standefer v. United States, 447 U.S. 10 (1980), the Supreme Court traced the reform and quoted the 1909 statute that became § 2: “Whoever directly commits any act constituting an offense defined in any law of the United States, or aids, abets, counsels, commands, induces, or procures its commission, is a principal.” The statute, the Court said, “abolishe[d] the distinction between principals and accessories and [made] them all principals.”

The 1948 revision that produced the current text confirmed the point. The Reviser’s Note to § 2 records that “The section as revised makes clear the legislative intent to punish as a principal not only one who directly commits an offense and one who ‘aids, abets, counsels, commands, induces or procures’ another to commit an offense, but also anyone who causes the doing of an act which if done by him directly would render him guilty of an offense against the United States.” Subsection (b) exists so that “one who puts in motion or assists in the illegal enterprise but causes the commission of an indispensable element of the offense by an innocent agent or instrumentality, is guilty as a principal even though he intentionally refrained from the direct act constituting the completed offense.”

Three practical consequences follow, and they surprise people:

1. There is no discount for having helped rather than acted. A federal indictment does not have a lesser “accessory” count for pre-offense help. It charges the substantive offense and cites § 2 alongside it. The statutory maximum is the principal’s maximum.
2. Section 2 is not usually a separate count at all. It is ordinarily pleaded as an alternative theory of liability on a substantive count — the count reads “…in violation of 18 U.S.C. §§ 1343 and 2.” A defendant can be convicted on an aiding-and-abetting theory without the indictment saying so in terms.
3. The principal’s acquittal does not save you. Standefer held that “participants in conduct violating a federal criminal statute are ‘principals.’ As such, they are punishable for their criminal conduct; the fate of other participants is irrelevant.” The Court also held that nonmutual collateral estoppel does not apply in federal criminal cases, so a co-participant’s acquittal in a separate trial cannot be used to preclude the government from proving the offense in yours. As the Court put it: “While symmetry of results may be intellectually satisfying, it is not required.”

That third point is the one that most often has to be explained to a client and a family twice.

Aiding and abetting under § 2 — what the government must prove

The conduct element is broad and the intent element is narrow, and they are routinely merged by people describing this offense. The Supreme Court separated them in Rosemond v. United States, 572 U.S. 65 (2014):

“A person is liable under §2 only if he (1) takes an affirmative act in furtherance of the underlying offense (2) with the intent to facilitate that offense’s commission.”

On the first element, the reach is wide: “The common law imposed aiding and abetting liability on a person who facilitated any element of a criminal offense, even if he did not facilitate all elements.” You do not have to do the central act, or any part of it. Driving, lending a phone, wiring money, signing a document, making an introduction — each can be an affirmative act in furtherance.

On the second element, the standard is demanding. Rosemond adopts Judge Learned Hand’s formulation: to aid and abet a crime, “a defendant must not just ‘in some sort associate himself with the venture,’ but also ‘participate in it as in something that he wishes to bring about’ and ‘seek by his action to make it succeed.'”

Rosemond itself was about aiding and abetting a firearm offense under 18 U.S.C. § 924(c), and the specific holding is tied to that statute: the government proves the § 924(c) violation “by proving that the defendant actively participated in the underlying drug trafficking or violent crime with advance knowledge that a confederate would use or carry a gun during the crime’s commission.” The Court then defined the timing requirement, and the phrase is worth remembering: “This must be advance knowledge—meaning, knowledge at a time when the accomplice has a reasonable opportunity to walk away.”

The reason the “walk away” language matters beyond § 924(c) is that it identifies the moment the law cares about. Intent is measured at the point where the defendant still had a choice. A person who learns mid-transaction that something more serious is happening, and who then has no realistic opportunity to withdraw, is in a different position from a person who knew at the outset.

Two limits are worth stating plainly. The Court did not address liability for third parties who incidentally facilitate a criminal venture — a gun store owner was the example — rather than actively participating in it. And the § 924(c) advance-knowledge holding should not be recited as though it were the general rule for every offense; the general rule is the two-element test quoted above.

Applied Insight — Elizabeth Franklin-Best, Esq., Principal Attorney: In an aiding-and-abetting case the defense work is almost always on the second element, not the first. The government will usually be able to point to an act. What it often cannot do is prove that the act was taken with the purpose of making this offense succeed, rather than in the ordinary course of a job, a friendship, a family relationship, or a business the defendant had no reason to think was criminal. That is a question about what the client knew and when — which means it is a question about documents, messages, and sequence, and it is answered from the record rather than from the client’s later account of his own state of mind.

Accessory after the fact under § 3

Section 3 is short enough to quote in full:

“Whoever, knowing that an offense against the United States has been committed, receives, relieves, comforts or assists the offender in order to hinder or prevent his apprehension, trial or punishment, is an accessory after the fact.

“Except as otherwise expressly provided by any Act of Congress, an accessory after the fact shall be imprisoned not more than one-half the maximum term of imprisonment or (notwithstanding section 3571) fined not more than one-half the maximum fine prescribed for the punishment of the principal, or both; or if the principal is punishable by life imprisonment or death, the accessory shall be imprisoned not more than 15 years.”

Read closely, that is four requirements:

1. A completed federal offense. Not a planned one, not a suspected one — one that has been committed.
2. Knowledge of it. The defendant must know the offense was committed.
3. An act of assistance to the offender — receiving, relieving, comforting or assisting him.
4. A specific purpose: to hinder or prevent his apprehension, trial or punishment. Assistance given for some other reason is not this offense.

The fourth requirement does most of the defense work. Giving a relative a place to sleep is not § 3. Giving a relative a place to sleep so that the marshals cannot find him is. The distinction is purpose, and it is almost always proved circumstantially — from what the defendant was told, what he said afterwards, and whether he lied to anyone about it.

The penalty formula, worked. Because the maximum is expressed as a fraction, it moves with the principal’s offense:

If the principal offense carries a maximum of…	The § 3 maximum is…
5 years	2 years 6 months
10 years	5 years
20 years	10 years
30 years	15 years
Life imprisonment	15 years (the statutory cap, not half of life)
Death	15 years (the statutory cap)

The fine works the same way — not more than one-half the maximum fine prescribed for the principal — and the statute says so “notwithstanding section 3571,” the general fine provision, so the halving controls.

How a § 3 sentence is actually computed

The statutory maximum is a ceiling. The number that drives an actual sentence is the guideline calculation, and for accessory after the fact that is USSG §2X3.1, which is entirely derivative. Its base offense level is:

• 6 levels lower than the offense level for the underlying offense, except as provided below;
• not less than level 4; and
• not more than level 30 — except that in a case in which “the conduct is limited to harboring a fugitive,” and the narrow terrorism carve-out in subdivision (C) does not apply, the base offense level is not more than level 20.

Three things follow that a reader cannot work out from the statute alone.

First, the calculation runs through someone else’s offense. Application Note 1 defines “underlying offense” as “the offense as to which the defendant is convicted of being an accessory,” and directs the court to “apply the base offense level plus any applicable specific offense characteristics that were known, or reasonably should have been known, by the defendant.” So the loss amount, drug quantity, or weapon in the principal’s case can flow into the accessory’s guideline range — but only to the extent the accessory knew or reasonably should have known of it. That knowledge limit is a live sentencing issue in almost every § 3 case.

Second, the level-30 and level-20 caps are the reason § 3 does not track a very serious offense all the way up. Someone who helped after a crime with an offense level of 43 does not get 37; the cap holds the base at 30, or at 20 if all he did was harbor a fugitive.

Third, the mitigating-role reduction is normally unavailable. Application Note 2 is explicit: the §3B1.2 adjustment “normally would not apply because an adjustment for reduced culpability is incorporated in the base offense level.” The six levels are the role reduction. Arguing for both is a common error.

Compare that with aiding and abetting. USSG §2X2.1 says simply: “The offense level is the same level as that for the underlying offense,” and its Background note adds, “A defendant convicted of aiding and abetting is punishable as a principal. 18 U.S.C. § 2. … An adjustment for a mitigating role (§3B1.2) may be applicable.” So the aider starts higher and can argue down; the accessory starts lower and normally cannot. In fiscal year 2025, the mitigating-role adjustment was applied 3,845 times across all federal sentencings (U.S. Sentencing Commission, Chapter Three Adjustments, FY2025, at p. 2), which is 5.8% of cases — it is available, but it is not routine. Our page on role reduction and minor participant status covers how it is argued.

For scale: §2X3.1 was applied 87 times in fiscal year 2025, out of 66,130 federal sentencings with complete guideline information (Use of Guidelines and Specific Offense Characteristics, FY2025, at p. 202). Accessory after the fact is a rarely used charge. That is not a reason to relax about it; it is a reason to expect the government to be charging it for a specific tactical purpose, usually as the resolution of a cooperation problem or as the lesser count in a negotiated disposition.

Misprision of felony under § 4 — silence is not the offense

Misprision is the statute people mean when they ask whether they can be charged for knowing about a crime and doing nothing. The text:

“Whoever, having knowledge of the actual commission of a felony cognizable by a court of the United States, conceals and does not as soon as possible make known the same to some judge or other person in civil or military authority under the United States, shall be fined under this title or imprisoned not more than three years, or both.”

The operative word is “conceals.” The statute reads as a conjunction — conceals and does not make known — and courts have construed it to require an affirmative step, not silence. In Roberts v. United States, 445 U.S. 552 (1980), the Supreme Court recorded that the misprision statute “has been construed to require ‘both knowledge of a crime and some affirmative act of concealment or participation.'”

The circuits apply a four-element formulation. In United States v. Caraballo-Rodriguez, 480 F.3d 62 (1st Cir. 2007), the court set it out as: “1) the principal committed and completed the alleged felony; 2) defendant had full knowledge of that fact; 3) defendant failed to notify the authorities; and 4) defendant took steps to conceal the crime.” The court accepted that formulation for the purposes of the appeal without deciding the statutory-construction question, but the fourth element is the one every circuit’s pattern instruction contains in some form.

What counts as an affirmative act is fact-bound and litigated: lying to investigators about the offense, destroying or hiding evidence of it, moving money, or telling a false story to cover for the offender. What does not count, on the authority above, is simply not calling the FBI.

Two further points. Roberts also observed that “this deeply rooted social obligation is not diminished when the witness to crime is involved in illicit activities himself. Unless his silence is protected by the privilege against self-incrimination … the criminal defendant no less than any other citizen is obliged to assist the authorities.” The Fifth Amendment interaction is real and is the reason misprision is charged carefully. And the guideline, USSG §2X4.1, is derivative like the others: “9 levels lower than the offense level for the underlying offense, but in no event less than 4, or more than 19,” with the same knowledge limit on specific offense characteristics and the same instruction that the mitigating-role adjustment normally does not apply.

Conspiracy under § 371 — the agreement is the offense

Conspiracy is the fourth statute in this family, and it is by far the most commonly charged. The text is one sentence:

“If two or more persons conspire either to commit any offense against the United States, or to defraud the United States, or any agency thereof in any manner or for any purpose, and one or more of such persons do any act to effect the object of the conspiracy, each shall be fined under this title or imprisoned not more than five years, or both.”

Four features distinguish it from everything else on this page:

• The object offense never has to happen. Aiding and abetting, accessory after the fact and misprision all require a completed offense. Conspiracy does not. The agreement, plus an overt act, is the crime.
• The overt act can be anyone’s, and it need not be criminal. The statute says “one or more of such persons do any act to effect the object of the conspiracy.” A phone call or a bank deposit will do.
• There are two objects, not one. A § 371 conspiracy can be a conspiracy to commit a federal offense or a conspiracy “to defraud the United States, or any agency thereof in any manner or for any purpose.” The second clause is broader than it looks and does not require an ordinary fraud.
• The five-year maximum has a ceiling-lowering proviso. “If, however, the offense, the commission of which is the object of the conspiracy, is a misdemeanor only, the punishment for such conspiracy shall not exceed the maximum punishment provided for such misdemeanor.”

One frequent misunderstanding: § 371’s five-year maximum is not the maximum for every federal conspiracy. Many statutes contain their own conspiracy provisions with far higher maximums — drug conspiracies are the best-known example — and where a specific conspiracy provision applies, § 371 is not the charging vehicle. Where no specific guideline covers the conspiracy, USSG §2X1.1 sets the offense level at the substantive offense’s level, less 3 levels unless the conspirators “completed all the acts the conspirators believed necessary on their part for the successful completion of the substantive offense” or were about to but for interruption.

Other statutes charged instead of § 3

Prosecutors often have a choice, and the choice usually favors the statute with the higher maximum or the easier proof. Two come up constantly.

18 U.S.C. § 1071, concealing a person from arrest. This reaches “whoever harbors or conceals any person for whose arrest a warrant or process has been issued under the provisions of any law of the United States, so as to prevent his discovery and arrest, after notice or knowledge of the fact that a warrant or process has been issued.” The maximum is one year — “except that if the warrant or process issued on a charge of felony, or after conviction of such person of any offense, the punishment shall be … imprisonment for not more than five years.” Note what § 1071 requires that § 3 does not: an existing warrant, and notice or knowledge of it. Note also what it does not require: that the person harbored actually committed anything. Section 1071 is listed in §2X3.1’s statutory provisions, so it is sentenced under the accessory-after-the-fact guideline.

18 U.S.C. § 1001, false statements. The most common way somebody in a supporting role becomes a defendant is not by hiding a person or destroying a document. It is by talking to a federal agent about it. Section 1001 requires no oath, carries up to five years — eight in the terrorism and enumerated-offense situations it lists — and applies to any matter within the jurisdiction of the executive, legislative or judicial branch. Our page on perjury and false statements sets out how § 1001 differs from the perjury statutes.

What the penalties actually are

Pulling the numbers together, because this is the question that brings most people to the page:

• Aiding and abetting (§ 2): no separate penalty. The maximum is the underlying offense’s maximum, and the guideline level is the underlying offense’s level.
• Accessory after the fact (§ 3): not more than one-half the principal’s maximum term, and not more than one-half the maximum fine; 15 years where the principal is punishable by life or death. Guideline: 6 levels below the underlying offense, floor 4, ceiling 30, or 20 for harboring alone.
• Misprision (§ 4): up to 3 years, a fine, or both. Guideline: 9 levels below the underlying offense, floor 4, ceiling 19.
• Conspiracy (§ 371): up to 5 years, a fine, or both — or the object offense’s maximum where that offense is a misdemeanor only.
• Concealing a person from arrest (§ 1071): up to 1 year, or up to 5 years where the warrant issued on a felony charge or after conviction.

All of these are statutory ceilings. The Guidelines are advisory, but the court must calculate the range correctly and take it into account before weighing the other sentencing factors and imposing a sentence. Nothing here predicts what any court would do in any case; how a judge moves from a range to a sentence is covered on our federal sentencing basics page.

Sentences are not limited to prison. A federal judgment can include a term of supervised release, a fine, restitution, forfeiture and a special assessment — and for a non-citizen, a conviction in any of these categories can carry immigration consequences that the criminal sentence itself does not describe.

Common defenses

The defenses that actually work here are element-specific, and they differ by statute.

1. No intent to facilitate (§ 2). Under Rosemond, an affirmative act is not enough; the government must prove the defendant sought to make the offense succeed. Acts that are ordinary in a lawful business, a job, a marriage or a friendship are the usual battleground.
2. No advance knowledge (§ 2, aggravating facts). Where liability depends on a fact the defendant learned only mid-course — a gun, a quantity, a victim’s status — Rosemond‘s “reasonable opportunity to walk away” framing is the argument.
3. No knowledge that an offense was committed (§ 3, § 4). Both statutes require knowledge of a completed federal offense. Suspicion is not knowledge, and the government has to prove more than that the defendant thought something felt wrong.
4. Assistance for a different purpose (§ 3). Section 3 requires that the help be given “in order to hinder or prevent” apprehension, trial or punishment. Help given out of family obligation, fear, or ignorance of what the person had done is not the offense.
5. No affirmative act of concealment (§ 4). Misprision requires steps to conceal. Silence, on the authority collected in Roberts, is not enough — and the Fifth Amendment privilege can independently protect the failure to come forward.
6. No agreement (§ 371). Knowing about a plan, being present, or benefiting from it is not the same as agreeing to it. Parallel conduct is not agreement.
7. Withdrawal. Withdrawal from a conspiracy is a recognized defense, but its requirements are demanding and circuit law varies; a defendant generally must do more than stop participating. Whether the facts support it is a question for counsel on the specific record, not something to assume.
8. Duress or coercion. Available in principle where the defendant acted under threat, and it is an affirmative defense with its own elements.
9. Misidentification and proof failure. Cases in this family are often built on cell-site data, financial records, and the testimony of cooperating co-defendants who have their own sentencing exposure. The reliability of that testimony, and what the cooperator was promised, is a standing issue.

Two defenses often raised in these cases do not work, and they are worth naming because they are common errors. “Impossibility” is not generally a defense to conspiracy — under § 371 the object offense need never be completed, and the agreement plus an overt act is the crime. And the acquittal of the principal offender does not defeat an aiding-and-abetting charge; Standefer holds that “the fate of other participants is irrelevant.”

How these charges actually arise

The scenarios below are illustrations, not case results, and they are chosen because each falls in a different column of the table above.

• The getaway driver. Someone drives to and from a bank robbery without entering the bank. This is § 2, not accessory after the fact: the driving facilitated the offense while it was being committed. If the government can prove he knew a confederate would carry a gun early enough to walk away, Rosemond also puts a § 924(c) count in play, with the same statutory maximum as the person who carried it.
• The safe house. Someone knowingly lets a person wanted on a federal felony warrant stay in their home to keep the marshals from finding him. That is § 1071 if there is a warrant and he knew of it; § 3 if the government proceeds on the completed underlying offense instead. Under §2X3.1, if the conduct is limited to harboring, the base offense level is capped at 20.
• The tip that becomes a scheme. An investment banker passes confidential information to a friend who trades on it. If he intended to facilitate the trading, this is § 2 liability for the securities offense — punishable as a principal — and depending on the agreement, a § 371 conspiracy as well.
• The phone thrown in the river. A family member disposes of devices after learning a relative is under federal investigation. Depending on what he knew and why he did it, this is potentially § 3, potentially § 4 as an affirmative act of concealment, and potentially an obstruction offense under Title 18 — and it will almost certainly be litigated as a two-level obstruction increase at his own sentencing if he is charged with anything at all.
• The interview. The same family member, asked about the phone by an agent, says he does not know where it went. No oath is administered. That is § 1001 exposure, and it is how a person who was a witness becomes a defendant.

In every one of these, the government must prove what the person knew and what he was trying to achieve. Presence is not participation, and a family relationship is not intent.

What a defense lawyer looks at first

Before any of the doctrine matters, four questions decide the shape of the case.

Which statute is actually charged, and on what theory? Because § 2 is usually pleaded as an alternative theory on a substantive count rather than as a separate count, the charging language has to be read carefully. “In violation of 18 U.S.C. §§ 1349 and 2” is a very different document from a standalone § 3 count.

When did the client act, relative to the offense? Everything turns on the before/during/after line. The evidence that fixes it is timestamped: messages, call records, badge swipes, transaction times.

What did the client know, and when did he learn it? This is the second Rosemond element and the knowledge element of §§ 3 and 4 at once, and it is answered from documents rather than from a later account of a state of mind.

Did the client talk to anyone? An interview with a federal agent, a statement to a co-defendant who later cooperated, or a text message explaining what he did and why is usually the most important evidence in the file. If there has been an interview, the report of it needs to be obtained and read against what actually happened.

If you have received a target letter or a federal grand jury subpoena, those are the moments when this exposure is created or avoided — before charges, while there is still a choice about whether and how to speak.

Where this sits in a federal case

Accessory and aiding-and-abetting theories surface early, and they change what happens at every stage after.

• Federal investigation: this is where a person who was never the target becomes a defendant. Derivative-liability theories are how the government reaches the driver, the bookkeeper, the spouse who moved money, and the friend who made an introduction.
• Indictment: because § 2 is ordinarily pleaded as an alternative theory rather than a separate count, the charging language is where you find out which theory you are actually facing.
• Plea negotiations: the before/after line is often the whole negotiation. A § 3 count carries half the principal’s maximum and a base offense level six lower; a § 2 theory on the substantive count carries neither discount.
• Presentence report and sentencing: because §§2X2.1, 2X3.1 and 2X4.1 are all derivative, the fight is over what the defendant knew or reasonably should have known about the principal’s conduct — and over whether a mitigating-role reduction is available at all.

For the sequence of a federal case as a whole, start at the federal court process overview. For the false-statement statutes that so often attach to this conduct, see perjury and false statements. Definitions of the terms used here are collected in the glossary, and the federal offenses and charges index lists the substantive offenses these theories attach to.

What to do next if you are facing an accessory charge

If you have been told you are a target or a subject, received a grand jury subpoena, or been interviewed about someone else’s conduct, the first useful step is to work out which of these four statutes is actually in play and what the government would have to prove. That is a records question — when did you act, what did you know, and did you say anything to anyone — and the answer changes the exposure by an order of magnitude depending on which side of the before/after line the conduct falls.

Elizabeth Franklin-Best, P.C. is a boutique federal criminal defense and appellate firm founded in 2019, with more than 20 years of federal and appellate criminal defense experience and a national federal practice run on an intentionally small caseload, from offices in Columbia and Mount Pleasant, South Carolina. To discuss a federal matter, call (843) 620-1100 or contact us. Nothing on this page is legal advice, and reading it does not create an attorney-client relationship.

Frequently Asked Questions About Accessory Liability

Reviewed for legal accuracy by Elizabeth Franklin-Best, Esq., Principal Attorney·September 2026