
Federal common law is a term used in the United States to describe common law developed by federal courts instead of the courts of individual states. It is applied in areas where Congress has given courts the power to develop substantive law and where a federal rule of decision is necessary to protect federal interests. While federal common law is limited, it can be found in areas such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. Federal courts may also develop federal common law to fill statutory gaps or when federal law pre-empts state law. The legitimacy of federal common law is a subject of debate among judges and legal commentators, with some arguing that it must be traced to a written federal enactment.
| Characteristics | Values |
|---|---|
| Definition | Common law developed by federal courts instead of the courts of individual states |
| Basis | The U.S. Constitution, federal statutes, or federal treaties |
| Scope | Limited to areas where Congress has granted power to courts or where federal rules are necessary to protect federal interests |
| Examples | Admiralty law, antitrust, bankruptcy law, interstate commerce, civil rights, and ERISA-related cases |
| Flexibility | Subject to alteration by Congress |
| Jurisdiction | Federal courts have jurisdiction over federal crimes and matters of federal concern |
| State Law | State legislatures may codify common law rules, and state courts can define common law offenses in rare cases |
| Unwritten Law | Modern federal judges are more hesitant to apply unwritten law in areas beyond state law |
| Stare Decisis | Considered in common law, as seen in the 2019 Supreme Court case Gamble v. United States |
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What You'll Learn

Federal common law is developed by federal courts
Federal common law is a term used in the United States to describe common law developed by federal courts instead of the courts of individual states. This law is developed by federal courts in two basic categories. The first category is where Congress has granted the courts the power to develop substantive law, and the second is where a federal rule of decision is necessary to protect uniquely federal interests.
Congress often passes broad mandates with vague standards that are left to the courts to interpret. These interpretations eventually lead to complex understandings of Congress's original intent, informed by the courts' sense of justice and reasonableness. For example, in the Employee Retirement Income Security Act of 1974 (ERISA), federal courts have developed federal common law to fill statutory gaps, including applicable statutes of limitation, rules governing coordination of benefits disputes, the make-whole doctrine, agency law, and waivers by a designated beneficiary.
Federal common law is also created when a federal issue preempts state law but does not provide a clear rule for addressing the issue. In such cases, federal courts may articulate a rule of decision as a matter of unwritten law. However, many modern federal judges deny that unwritten law can operate broadly at the federal level, arguing that it entails a robust type of "lawmaking" analogous to the power exercised by legislatures when enacting written laws.
While federal common law is limited in scope, it continues to govern in several areas, including admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. Federal courts have jurisdiction over matters of federal concern, and federal law preempts state law when an issue falls within the exclusive domain of the federal government.
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Federal common law is subject to alteration by Congress
Federal common law refers to rules created and enforced by federal courts in the United States, as opposed to the courts of individual states. This concept was established in 1938 in the case of Erie Railroad v. Tompkins, where the Supreme Court held that federal courts hearing cases under their diversity jurisdiction must apply the substantive laws of the states in which they are located, rather than developing their own common law.
However, federal common law still exists in certain areas. Firstly, it applies in areas where Congress has explicitly granted the courts the power to develop substantive law, such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. Secondly, federal common law may be necessary to protect uniquely federal interests, as seen in the 2020 case of Rodriguez v. FDIC, where the Supreme Court struck down a federal common law rule regarding the distribution of corporate tax refunds.
Despite the existence of federal common law, it is subject to alteration by Congress. This principle is rooted in the US Constitution, which vests all legislative powers in Congress, consisting of the Senate and the House of Representatives. For instance, in the Federalist Papers, Alexander Hamilton noted that the New York Constitution made common law subject to alterations by the legislature. This dynamic ensures that federal common law aligns with the intentions of Congress and can be adjusted as needed.
The relationship between federal common law and Congress is complex. On the one hand, federal courts have the authority to interpret and apply federal law, filling in gaps where necessary. On the other hand, Congress can always step in to clarify, modify, or override the interpretations made by the federal courts. This dynamic interplay between the legislative and judicial branches helps shape the evolution of federal common law over time.
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Federal common law exists in limited areas
Federal common law is a term used in the United States to describe common law developed by federal courts instead of the courts of individual states. Federal common law exists in limited areas, as most common law is found at the state level. There are two basic categories of federal common law: areas where Congress has given the courts the power to develop substantive law, and areas where a federal rule of decision is necessary to protect uniquely federal interests.
The U.S. Congress has given courts the power to formulate common law rules in areas such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. Congress often lays down broad mandates with vague standards, which are then left to the courts to interpret. These interpretations can eventually give rise to complex understandings of Congress's original intent, informed by the courts' understanding of what is just and reasonable.
Federal common law may be created when a federal statute or treaty prevents state law from providing an answer but does not provide a resolution itself. In these cases, courts may articulate a rule of decision as a matter of unwritten law. However, many modern federal judges deny that unwritten law can operate broadly at the federal level, as it entails a robust type of "lawmaking" analogous to the power exercised by legislatures when enacting written laws.
While federal common law exists in limited areas, it can still play an important role in shaping legal principles and addressing issues that arise in various contexts. For example, in the context of the Employee Retirement Income Security Act of 1974 (ERISA), federal courts have developed federal common law to fill statutory gaps and address issues not addressed by state law.
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Federal common law is used when state law cannot provide answers
Federal common law is a term used to describe common law that is developed by federal courts, as opposed to the courts of individual states. In the United States, federal common law is used in specific areas where state law cannot provide answers.
Federal common law is applied in two main categories of cases. The first category includes areas where Congress has granted the courts the power to develop substantive law, such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. The second category involves situations where a federal rule of decision is necessary to protect uniquely federal interests. This was highlighted in the 2020 Supreme Court case of Rodriguez v. FDIC, where the Court emphasised that federal common lawmaking must be "necessary to protect uniquely federal interests".
An example of federal common law being used to fill in statutory gaps at the state level is the Employee Retirement Income Security Act of 1974 (ERISA). Federal courts have developed federal common law under ERISA to address issues not covered by state law, such as applicable statutes of limitation, rules governing coordination of benefits disputes, and the make-whole doctrine.
It is important to note that the scope of federal common law is limited, and federal courts generally do not have jurisdiction to define new common law crimes. For federal crimes, there must be a constitutionally valid statute defining the offense, jurisdiction, and penalties. While there is no explicit prohibition on state courts from defining common law offenses, they are rare, and most states have abolished them.
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Federal common law is created to protect federal interests
Federal common law is a term used in the United States to describe common law that is developed by federal courts, rather than by the courts of individual states. Federal common law is created in two basic categories: areas where Congress has given the courts the power to develop substantive law, and areas where a federal rule of decision is necessary to protect uniquely federal interests.
The U.S. Congress has given courts the power to formulate common law rules in areas such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. In these areas, Congress often provides broad mandates with vague standards, leaving it to the courts to interpret and apply them. This process gives rise to complex understandings of Congress's original intent, informed by the courts' interpretation of what is just and reasonable.
Federal common law is also created to protect federal interests in situations where a federal statute, treaty, or the Constitution prevents state law from providing an answer. For example, in the context of the Employee Retirement Income Security Act of 1974 (ERISA), federal courts have developed federal common law to fill statutory gaps. Federal common law may also be necessary when ERISA preempts a state law but does not address the specific issue that is preempted.
While federal common law plays a role in protecting federal interests, it is important to note that its scope is limited. Modern federal judges generally agree that federal common law exists only in "limited areas," but there is a lack of clarity on how to identify those areas precisely. Some commentators advocate for restrictive approaches, arguing that every rule of decision with the status of federal law must be traced to a written federal enactment.
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Frequently asked questions
Federal common law is a term used to describe common law that is developed by the federal courts, instead of by the courts of the various states.
Federal common law can be applied in areas where Congress has given the courts power to develop substantive law, such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights.
Yes, even when a federal court has the authority to make common law, that law is subject to alteration by Congress.



























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