An injunction is a court order that requires a person or organization to do something, or to stop doing something. It is one of the most powerful tools in civil litigation because it acts before the harm is complete. Instead of awarding money after the fact, an injunction changes behavior while the dispute is still live.
Two Basic Forms
Courts divide injunctions by what they command. A prohibitory injunction orders a party to stop a specific act, such as continuing a nuisance or using a trademark. A mandatory injunction orders a party to take positive action, such as removing a structure, turning over records, or restoring property. Mandatory injunctions are granted less often because they require closer judicial supervision and can be harder to unwind if the case later goes the other way.
Temporary, Preliminary, and Permanent
Injunctions are also classified by when they apply and how long they last. Federal practice is governed largely by Rule 65 of the Federal Rules of Civil Procedure, which is published at uscourts.gov and summarized at law.cornell.edu.
| Type | When it is sought | Typical duration | Governing standard |
|---|---|---|---|
| Temporary restraining order | Before the other side can respond | Short, often 14 days and extendable | Immediate and irreparable injury |
| Preliminary injunction | Early in the case, after notice | Until trial or further order | Four-factor test |
| Permanent injunction | After trial on the merits | Final, and may be indefinite | Party prevailed on the merits |
The Four-Factor Test
For a preliminary injunction, most federal courts weigh four factors together:
- Likelihood of success on the merits. The movant must show a real prospect of winning the case.
- Irreparable harm. Money damages after trial would not fix the injury.
- Balance of equities. The harm to the movant outweighs the harm the order imposes on the other side.
- Public interest. The order does not harm the public or, in some cases, serves it.
Courts do not apply these factors like a checklist. They weigh them, and the strength of one can offset weakness in another. State courts use similar tests, though the exact wording and the weight given to each factor vary by jurisdiction.
Notice, Bond, and Safeguards
Because an injunction restricts liberty before a full trial, the rules build in protection. A preliminary injunction generally requires notice to the opposing party and an opportunity to be heard. A temporary restraining order can issue without notice in narrow emergencies, but the movant must show why notice cannot wait, and the order expires quickly. Rule 65 also requires the moving party to post a security bond that covers costs and damages if the restraint turns out to have been wrongfully issued.
How Injunctions Are Enforced
An injunction binds the party named in it, and sometimes people acting in concert with that party. Enforcement runs through the court's contempt power. Civil contempt uses fines or even jail to coerce compliance and to compensate the other side. Criminal contempt punishes a willful violation as an offense against the court. Because contempt can carry jail time, courts take the terms of an order seriously and expect parties to obey even while an appeal is pending, unless the court stays the order.
Common Uses
- Domestic violence and civil protection orders.
- Nuisance, trespass, and property boundary disputes.
- Trademark, copyright, and trade secret cases.
- Non-compete and non-solicitation agreements.
- Environmental and land-use violations.
- Labor disputes and picketing limits.
Defenses and Limits
A party can resist an injunction by arguing that the harm is not irreparable, that money damages are adequate, that the movant is unlikely to win, that the order is too vague or too broad, or that it would impose an unfair burden. Courts must also respect constitutional limits, including the First Amendment, and they cannot issue an order that is effectively impossible to perform or that reaches conduct outside the dispute.
State Court Practice
State courts issue injunctions under their own rules of civil procedure and their own standards. Some states follow the four-factor approach closely. Others use a more flexible sliding scale, and some apply a stricter test for mandatory relief. The labels can differ too, with terms such as restraining order, temporary injunction, and permanent injunction carrying specific meanings in each state. When a case is filed in state court, check that state's rules and local practice, because the federal standard is not automatically the governing one.
Where Injunctions Come From
Injunctions are a remedy from equity, the branch of law that developed alongside the money-damages courts. Equity courts could order a person to act or refrain from acting when money could not fix the problem. That history explains several features of modern practice: injunctions are discretionary rather than automatic, they are directed at a person rather than at property, and a court may refuse one even when a legal wrong is proven if the remedy would be unfair or unworkable.
Modifying, Dissolving, and Appealing
An injunction is not always permanent in practice. A party can ask the court to modify the terms or to dissolve the order when circumstances change, such as when the conduct has stopped, when a contract expires, or when new facts make the original order unnecessary or unjust. Courts also have the power to clarify vague terms rather than leave a party guessing about compliance.
A party that disagrees with an injunction can appeal, but an appeal does not automatically pause the order. The appellant must ask the court for a stay, and the court weighs factors similar to those used to grant the injunction in the first place. If no stay is granted, the party generally must comply while the appeal proceeds, and violating the order can lead to contempt even if the appeal later succeeds.
Practical Considerations
Timing often decides the value of injunctive relief. A request filed after the harm is complete may be denied as moot, so a party who needs to preserve the status quo should move early. The papers must also be specific. Courts prefer orders that describe exactly what is prohibited or required, because an order that is too broad may be struck down and one that is too vague may be unenforceable. Evidence of the threatened harm, such as declarations, records, or expert analysis, usually carries more weight than general allegations.
This guide is general information only and is not legal advice. Injunction standards and procedures vary by court and by state, so consult a licensed attorney about any specific matter.