
Federal common law is a term used in the United States to describe common law developed by federal courts, as opposed to the courts of individual states. Federal common law is valid only to the extent that Congress has not repealed it. It is applied in areas where Congress has empowered the courts to develop substantive law, and where a federal rule of decision is necessary to protect federal interests. Federal common law is also applied in cases where Congress has authorised the federal courts to establish substantive law, such as in the context of the Employee Retirement Income Security Act of 1974 (ERISA).
| Characteristics | Values |
|---|---|
| Definition | Common law developed by federal courts instead of the courts of individual states |
| Scope | Limited scope, existing only in "limited areas" |
| Pre-conditions | Preemption is a pre-condition for recognizing federal common law |
| Erie Decision | Did not end other types of federal common law |
| Categories | Congress empowering courts to develop substantive law, and areas where a federal rule of decision is necessary to protect uniquely federal interests |
| Congressional Power | Federal common law is subject to alteration by Congress |
| Examples | Admiralty law, antitrust, bankruptcy law, interstate commerce, civil rights, ERISA-regulated plans |
| Academic Criticism | Justice Scalia: "there is no such thing as common law" in federal courts |
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What You'll Learn

Federal common law is developed by federal courts
Federal common law refers to the body of law created and applied by federal courts in the United States. It is developed by federal courts to govern issues that are not explicitly addressed by constitutional or statutory provisions. This lawmaking power of federal courts is restricted to areas where federal interests need to be protected or when Congress has authorised them to establish substantive law. The Supreme Court has clarified that federal common law is valid only until Congress chooses to repeal it by enacting legislation on the same issue.
The development of federal common law can be traced back to the 1842 case of Swift v. Tyson, where the U.S. Supreme Court held that federal courts hearing cases under their diversity jurisdiction must apply the statutory law of the states but not the common law developed by state courts. The rationale behind this decision was the belief that federal courts would craft superior common law that would be voluntarily adopted by state courts. However, this expectation was not met, and the principles of common law in different states diverged significantly over time.
The era of Swift v. Tyson ended in 1938 with the Supreme Court's decision in Erie Railroad v. Tompkins, which overturned the earlier ruling. The Erie Court held that there is no "federal general common law", emphasising that federal courts exercising diversity jurisdiction must apply the same substantive laws as the state courts. Despite this decision, federal common law continues to exist in limited areas. These areas fall into two categories: where Congress has granted courts the power to develop substantive law, and where a federal rule of decision is necessary to protect uniquely federal interests.
Congress often passes broad mandates with vague standards, leaving room for interpretation by the courts. Through their interpretations, federal courts contribute to the evolution of federal common law. This process can be observed in various contexts, such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. While federal common law is a limited aspect of the American legal system, it plays a role in governing specific areas of law where federal interests are paramount or where statutory gaps need to be filled.
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Federal common law is valid unless repealed by Congress
Federal common law is a term used to describe common law developed by federal courts in the United States, rather than by the courts of individual states. It is a legally binding set of federal rules adopted by federal courts to govern issues not expressly addressed by constitutional or statutory provisions. Federal common law is valid unless repealed by Congress, as the Supreme Court has explained that when Congress addresses a question previously governed by federal common law, the need for such law-making by federal courts is diminished.
The development of federal common law is limited to specific areas. Firstly, where Congress has granted courts the power to develop substantive law, and secondly, where a federal rule of decision is necessary to protect uniquely federal interests. For example, federal common law has been applied in admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. This law-making power of federal courts is, however, subject to alteration by Congress, as highlighted by Alexander Hamilton in The Federalist Papers, where he emphasised that common law is alterable by legislatures.
The legitimacy of federal common law has been a subject of debate, with some advocating for restrictive approaches. Justice Scalia, for instance, argued that federal courts primarily interpret existing texts rather than create common law. Academic critics, while accepting this premise, argue that federal courts can exert more law-making power than is commonly believed. Nevertheless, it is generally agreed that federal common law exists only in limited areas, with preemption by federal law being a precondition for its recognition.
The evolution of federal common law can be traced back to the Erie Railroad Co. v. Tompkins case in 1938, where the Supreme Court held that federal courts exercising diversity jurisdiction must apply the same substantive laws as the state courts. This decision overturned the earlier Swift v. Tyson case, which had allowed federal courts to craft their own common law. Despite the Erie decision, federal common law continues to govern in specific areas, as recognised by the Supreme Court in subsequent cases.
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Federal common law governs interstate commerce
Federal common law refers to a set of legally binding federal rules adopted by federal courts in the United States to govern issues not expressly addressed by constitutional or statutory provisions. It is developed by federal courts instead of the courts of individual states. Federal common law is only valid if Congress has not repealed it.
The concept of federal common law is based on the idea that federal courts may develop and apply these rules to protect uniquely federal interests or resolve conflicts among states. This occurs when Congress has authorised federal courts to establish substantive law or when there is a need to fill statutory gaps. For example, in the context of the Employee Retirement Income Security Act of 1974 (ERISA), federal courts have formulated federal common law to address issues such as statutes of limitation, coordination of benefits disputes, and waivers by a designated beneficiary.
Interstate commerce is one of the areas where federal common law continues to govern. The U.S. Congress has empowered courts to create common law rules in this area, recognising the need to maintain uniformity and consistency in the regulations governing trade and economic activities across state lines. By applying federal common law in interstate commerce, the courts ensure that the legal framework for commercial interactions among different states remains standardised, promoting a stable and predictable business environment.
The application of federal common law in interstate commerce can be particularly relevant in situations where state laws differ significantly or conflict with each other. In such cases, federal common law provides a uniform set of rules that transcend state boundaries, facilitating smooth and efficient commerce. This helps to avoid the complexities that could arise from a patchwork of varying state regulations, which might hinder interstate transactions and disrupt the flow of goods, services, and economic opportunities across state lines.
While federal common law plays a crucial role in governing interstate commerce, it is important to recognise that its scope is limited. Federal common law is applied only in specific areas where it is deemed necessary to protect uniquely federal interests or resolve interstate conflicts. In other areas of law, state common law and statutory provisions predominate, reflecting the balance between federal and state authority in the United States legal system.
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Federal common law is limited to specific 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. While most common law is found at the state level, there are a few specific areas where federal common law continues to govern.
Federal common law is valid only to the extent that Congress has not repealed it. It is limited to areas where Congress has empowered the courts to develop substantive law, and where a federal rule of decision is necessary to protect uniquely federal interests. These areas include admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. Federal common law can also be applied to resolve conflicts among the states or when Congress has authorized the federal courts to establish substantive law.
The Supreme Court has clarified that federal common law is an "unusual exercise of law-making" by federal courts and is only necessary when a question cannot be answered by state law but is also not resolved by the Constitution, a federal statute, or a federal treaty. This understanding of federal common law is reflected in the Supreme Court's decision in Erie Railroad Co. v. Tompkins, which held that federal courts exercising diversity jurisdiction must apply the same substantive laws as the state courts.
While the exact scope of federal common law is not always clear, it is generally agreed that it exists only in limited areas. Some commentators have suggested that preemption, or the displacement of state lawmaking powers, is a precondition for recognizing federal common law. This interpretation allows for a significant role for federal common law, as it can be applied whenever the Constitution, a federal statute, or a federal treaty prevents state law from providing an answer.
In summary, federal common law is limited to specific areas where federal interests need to be protected or where Congress has authorized the development of substantive law. These areas include admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights, among others. The application of federal common law is shaped by the understanding that common law is alterable by legislatures and subject to repeal by Congress.
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Federal common law is not general common law
Federal common law is a term used in the United States to describe common law developed by federal courts, as opposed to the courts of individual states. It is a legally binding set of federal rules adopted by federal courts to govern issues not expressly addressed by constitutional or statutory provisions. Federal common law is valid only to the extent that Congress has not repealed it.
Federal common law exists only in "limited areas", such as admiralty law, antitrust, bankruptcy law, interstate commerce, and civil rights. It is applied when federal courts are authorized by Congress to establish substantive law, or when it is necessary to protect uniquely federal interests. For example, federal common law may be applied to resolve conflicts among states.
General common law, on the other hand, refers to the unwritten laws and precedents that have been established by state courts and legislatures. While federal common law is created by federal courts, general common law is primarily developed at the state level. State legislatures may codify common law rules to give them the force of statute law or to modify them.
The distinction between federal common law and general common law is important because they operate in different spheres of influence. Federal common law applies in areas where federal interests are at stake, while general common law operates at the state level and is subject to state lawmaking powers. This distinction was highlighted in the Erie Railroad v. Tompkins case, where the Supreme Court held that there is no "federal general common law", emphasizing the word “general".
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Frequently asked questions
Federal common law is a term used in the United States to describe common law that is developed by federal courts, instead of the courts of individual states.
Federal common law can be applied in areas where Congress has given courts the power to develop substantive law, such as admiralty law, bankruptcy law, and civil rights.
Federal common law is applied in situations where state law is unable to address an issue that falls under federal jurisdiction, such as conflicts among states. Federal courts have also followed the precedents set by each state's highest court regarding the content of the state's unwritten law.
Yes, federal common law is subject to alteration by Congress. This is because common law is understood to be alterable by legislatures, and Congress holds legislative power in the federal system.
































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