An inchoate crime is a criminal offense in which the intended illegal act was never actually completed. The word “inchoate” means incomplete or just beginning, and the law uses it to describe conduct that moves meaningfully toward a crime without finishing it. Three offenses fall under the category: attempt, conspiracy, and solicitation. All three are punishable in their own right because a person who takes concrete steps toward a crime has shown both intent and dangerousness, even if something stopped the final act from happening.
The Three Types of Inchoate Offenses
Attempt
Criminal attempt is the most intuitive of the three: you tried to commit a crime and did not finish. The plan fell apart, the victim escaped, or police intervened. The reason does not matter. To convict, prosecutors must prove two things: that the defendant specifically intended to commit the target crime, and that the defendant took action beyond mere planning or thought.1Cornell Law School. Attempt
That second element is where most attempt cases turn. The line between innocent preparation and criminal conduct is often blurry. Buying a ski mask at a sporting goods store is preparation. Walking into a bank wearing that mask while carrying a weapon is something else. Jurisdictions that follow the Model Penal Code apply a “substantial step” test, which asks whether the defendant’s actions strongly confirm a criminal purpose. The MPC gives specific examples: lying in wait for a victim, following a target, or possessing tools that have no legitimate use and are plainly designed for the offense.2Vermont General Assembly. Model Penal Code 5.01 Criminal Attempt
Older common-law jurisdictions set a higher bar, asking whether the defendant came dangerously close to completing the crime and had the present ability to finish.1Cornell Law School. Attempt In practice, the MPC approach lets police make arrests earlier; the common-law approach generally requires waiting until the defendant is much closer to the end.
Conspiracy
A conspiracy forms the moment two or more people agree to commit a crime together. No one has to sign anything or shake hands. The agreement can be entirely informal, and prosecutors regularly prove it through circumstantial evidence like coordinated behavior, coded communications, or shared resources.3Legal Information Institute (LII) / Cornell Law School. Conspiracy
Beyond the agreement, prosecutors have to show that each defendant intended both to enter it and to achieve the illegal goal. Most jurisdictions add a third requirement: at least one conspirator must take an “overt act” to further the plan. The overt act does not have to be illegal on its own. If two people agree to commit a burglary and one of them buys a crowbar, the purchase satisfies the requirement and exposes both of them to liability.3Legal Information Institute (LII) / Cornell Law School. Conspiracy
Solicitation
Solicitation is the act of asking, encouraging, commanding, or hiring someone else to commit a crime. Money does not have to change hands, though that is the classic version. Pressuring a friend to help you commit fraud or urging someone to assault a rival both qualify. The elements are the request itself and the specific intent that the other person actually carry out the crime.4LII / Legal Information Institute. Solicitation
The unusual feature of solicitation is that the crime is complete the moment the request is made. It does not matter whether the other person agrees, refuses, or even understands what is being asked. The offense lies in the asking. Offer someone money to vandalize a competitor’s store, and the solicitation has already happened whether that person says yes, says no, or calls the police.
Why Conspiracy Carries Expanded Liability
Conspiracy comes with a form of liability that catches many defendants by surprise. Under the Pinkerton doctrine, every member of a conspiracy can be held responsible for crimes committed by any co-conspirator, provided those crimes were committed in furtherance of the conspiracy and were reasonably foreseeable. A conspirator does not have to participate in, or even know about, a co-conspirator’s specific criminal act to be convicted for it.5LII / Legal Information Institute. Pinkerton Liability
This is where conspiracy becomes far more dangerous than the other inchoate offenses. Agree to help rob a warehouse, and if a co-conspirator assaults the security guard during the robbery, you can be convicted of that assault even though you never touched anyone. The test is whether the assault was a natural or foreseeable consequence of the plan. Courts reason that group criminal activity is inherently more dangerous than solo crime, and that participants who set a criminal enterprise in motion are responsible for what it produces.
How Inchoate Crimes Are Punished
Penalties vary widely by jurisdiction and by the underlying crime. Some federal statutes impose the same penalty for attempting or conspiring as for completing the offense. Federal fraud statutes work this way: attempt and conspiracy carry the same maximum sentences as the completed crime.6Office of the Law Revision Counsel. 18 U.S. Code 1349 – Attempt and Conspiracy
The general federal conspiracy statute is different. It caps the sentence at five years, unless the target offense is only a misdemeanor, in which case the conspiracy penalty cannot exceed the misdemeanor maximum.7Office of the Law Revision Counsel. 18 U.S. Code 371 – Conspiracy to Commit Offense or to Defraud United States Federal solicitation of a violent crime is punished at up to half the maximum sentence for the completed offense, with a ceiling of 20 years when the target crime carries life imprisonment or the death penalty.8Office of the Law Revision Counsel. 18 U.S. Code 373 – Solicitation to Commit a Crime of Violence
State approaches run the gamut: some impose the same maximum as the completed crime, some cap the sentence at half the completed crime’s penalty, and some reduce the offense classification by one level. The Model Penal Code generally grades attempt, solicitation, and conspiracy at the same level as the target offense, with an exception for the most serious felonies.
The practical takeaway is that inchoate offenses are not lesser charges. In many contexts, a defendant convicted of attempt or conspiracy faces the same prison time as someone who finished the job.
Defenses
Abandonment and Renunciation
A defendant who voluntarily and completely abandons the criminal plan before the crime is carried out may have a defense. “Voluntarily” is the critical word. Giving up because you got scared of being caught, because the victim unexpectedly fought back, or because you decided to try again next week does not count. The abandonment must come from a genuine change of heart, not from a change in circumstances.
The requirements are strictest for solicitation. Under federal law, simply trying to talk the other person out of the crime is not enough. You have to actually prevent the solicited crime from happening, and you carry the burden of proving it.9United States Department of Justice Archives. Affirmative Defense to Solicitation – Renunciation Postponing the crime to a later date or switching to a different victim does not qualify.8Office of the Law Revision Counsel. 18 U.S. Code 373 – Solicitation to Commit a Crime of Violence
Withdrawing from a conspiracy works differently. A conspirator can withdraw by taking clear, affirmative steps inconsistent with the conspiracy’s purpose and by making reasonable efforts to notify co-conspirators of the withdrawal. The defendant bears the burden of proving this by a preponderance of the evidence.10United States Courts for the Ninth Circuit. 8.24 Withdrawal From Conspiracy Even a successful withdrawal does not erase liability for the conspiracy charge itself if an overt act has already occurred. It only cuts off responsibility for future crimes committed by the remaining conspirators.
Impossibility
Sometimes a defendant argues that the crime was physically impossible to complete. Courts split this into two types. Factual impossibility occurs when the crime fails because of circumstances the defendant did not know about. Trying to pick an empty pocket or shooting at an empty bed where the intended victim was supposed to be sleeping are the classic examples. Factual impossibility is not a valid defense, because the defendant fully intended to commit the crime and would have succeeded if the facts had matched the belief.11Legal Information Institute (LII) / Cornell Law School. Impossibility
Legal impossibility is different and generally does work as a defense. It arises when the defendant believes their conduct is criminal but it actually is not. If someone smuggles a substance into the country thinking it is illegal contraband, but the substance turns out to be completely legal, there is no crime to attempt. A mistaken belief that you were breaking the law is not enough for a conviction.11Legal Information Institute (LII) / Cornell Law School. Impossibility
When the Inchoate Charge Merges Into the Completed Crime
If someone attempts a crime and actually finishes it, they cannot be convicted of both the attempt and the completed offense. The attempt merges into the completed crime, and the defendant faces punishment only for the finished act. The same goes for solicitation: hire someone to commit arson and the building burns down, and you are liable for arson, not arson plus solicitation. The merger doctrine prevents double punishment for what is essentially one course of criminal conduct.12Legal Information Institute. Merger Doctrine
Conspiracy is the exception. A defendant can be convicted of both the conspiracy and the completed target crime. Courts treat the agreement itself as a separate harm: a criminal group that successfully carries out its plan has created two distinct dangers, the group enterprise and the completed crime. Because conspiracy does not merge, it is routinely stacked on top of substantive charges in federal prosecutions, which is one reason prosecutors favor it so heavily.12Legal Information Institute. Merger Doctrine Anyone facing an inchoate charge should treat it with the same seriousness as the underlying completed offense.