
The Import-Export Clause, also known as Article I, Section 10, Clause 5 of the United States Constitution, is a provision that prevents individual states from imposing tariffs on imports and exports without the consent of Congress. The clause is designed to limit the states' ability to interfere with foreign trade and secure revenues from tariffs for the federal government. It also prevents states from imposing taxes based on the tonnage (internal capacity) of a vessel, which is an indirect method of taxing imports and exports. The Import-Export Clause has been the subject of several Supreme Court cases, with varying interpretations, and continues to be an important aspect of US trade policy.
| Characteristics | Values |
|---|---|
| Purpose | To limit the states' ability to interfere with commerce and to prevent states from imposing tariffs and regulations that conflict with Congress' efforts to regulate trade with foreign nations. |
| Legal Basis | Article I, § 10, Clause 5 of the United States Constitution, also known as the Import-Export Clause. |
| Prohibitions | States are prevented from imposing tariffs on imports and exports above what is necessary for their inspection laws. |
| Exceptions | State inspection laws, which allow for the collection of taxes or duties on imports and exports for inspection purposes. |
| Federal Government Role | The federal government secures revenues from all tariffs on imports and exports. |
| Case Law | Several 19th-century Supreme Court cases applied the clause to duties and imposts on interstate imports and exports, but the interpretation has been questioned by modern legal scholars. |
| Interpretation | The Import-Export Clause has been interpreted to apply only to imports and exports with foreign nations and not with other states. |
| State Subsidies | The Import-Export Clause prohibits state tariffs and permits state subsidies. |
| Tonnage Clause | Prevents states from imposing taxes based on the internal capacity of a vessel, which is an indirect method of taxing imports and exports. |
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What You'll Learn

The Import-Export Clause
> lay any Imposts or Duties on Imports or Exports, except what may be absolutely necessary for executing its inspection Laws.
This means that states cannot impose taxes or duties on goods brought into or sent out of the country without Congress's permission. The only exception is when states need to collect taxes for executing inspection laws, which are permitted to ensure that imported goods meet certain standards.
The Supreme Court has interpreted the Import-Export Clause in several cases, including Brown v. Maryland (1827), where Chief Justice John Marshall held that the clear intention of the Framers was to prohibit states from levying customs duties. The Court ruled that imported goods should be free from state taxation until they have been incorporated into the mass of property in the state. This ruling established the "'original package' doctrine", which states that imported goods remain under the protection of the Import-Export Clause until they are removed from their original packaging and become part of the general mass of property in the state.
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State tariffs and regulations
The Import-Export Clause, or Article I, § 10, clause 5 of the United States Constitution, prevents states from imposing tariffs on imports and exports without the consent of Congress. This clause was designed to limit the states' ability to interfere with commerce and to secure revenues from tariffs on imports and exports for the federal government. It is important to note that this clause does not prohibit every "tax" that may impact imports or exports but rather targets exactions specifically directed at imports, exports, or commercial activity therein.
Prior to the adoption of the Constitution, states imposed tariffs on goods from other countries and colonies to address adverse economic conditions and protect domestic industries. The Import-Export Clause was adopted to address this issue and prevent states from imposing tariffs and regulations that conflicted with congressional efforts to regulate trade with foreign nations. The clause also aimed to mitigate commercial strife between states with major ports and those without, as the former group of states used tariffs on goods destined for other states to generate revenue.
The Import-Export Clause has been the subject of considerable debate and interpretation by the Supreme Court. In the 19th century, the Court ruled that the clause only applied to imports and exports with foreign nations and not with other states. However, this interpretation has been questioned by modern legal scholars. The Court has also clarified that certain fees and taxes, such as pilotage fees and license taxes on processed fish, are not considered duties on imports or exports.
The Tonnage Clause, or Article I, § 10, clause 3, is another relevant provision that prevents states from imposing taxes based on the tonnage (internal capacity) of a vessel. This clause was intended to prevent indirect taxation of imports and exports and to stop states with convenient ports from taxing goods destined for states without good ports.
The Import-Export Clause grants the federal government sole power over tariffs on imports and exports, ensuring a unified approach to regulating commercial relations with foreign governments. This power is further reinforced by the dormant commerce clause doctrine, which includes considerations of multiple taxation and the federal government's ability to deal with foreign nations.
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Congressional consent
The Import-Export Clause, or Article I, § 10, clause 5, of the United States Constitution, prevents states from imposing tariffs on imports and exports without the consent of Congress. This clause was designed to limit the states' ability to interfere with commerce and to prevent them from imposing tariffs and regulations that conflicted with Congress' efforts to regulate trade with foreign nations.
The Import-Export Clause specifically prohibits states from imposing imposts or duties on imports and exports, except for what is necessary to execute their inspection laws. Inspection laws are meant to ensure that goods meet certain standards of quality, form, capacity, dimensions, and weight before they enter the market. While states can impose taxes or duties to cover the costs of these inspections, they cannot use them as a means to generate revenue or interfere with interstate commerce.
Additionally, congressional consent may come into play when determining whether a particular tax falls on "articles exported." While an income tax of general application is not considered a tax on exports, a tax on goods at the pre-export stage is permitted. However, once goods enter the stream of commerce leading to exportation, the Clause applies, and such goods cannot be taxed.
In conclusion, congressional consent in the context of imports and exports in the Constitution refers to the power granted to Congress to regulate state actions regarding tariffs, duties, and taxes on goods entering or leaving the country. This provision ensures that states do not hinder federal trade policies and protects against commercial strife between states.
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Inspection laws
The Import-Export Clause of the US Constitution, also known as Article I, § 10, clause 5, prevents states, without the consent of Congress, from imposing tariffs on imports and exports beyond what is necessary for their inspection laws. The clause was designed to limit the states' ability to interfere with commerce and generally prohibits states from imposing imposts or duties on imports and exports without congressional consent.
The Import-Export Clause has an exception for state inspection laws. State inspections were historically carried out on land for both imports and exports, and a "tax or duty of inspection" was often paid for services performed on land once the imported item was within the country. This exception was included to prevent states from imposing tariffs and regulations that conflicted with Congress' efforts to regulate trade with foreign nations.
The Tonnage Clause (Art. I, § 10, clause 3) is another measure that prevents states from imposing taxes based on the tonnage (internal capacity) of a vessel, which is an indirect way of taxing imports and exports.
The Court has recognised a general right of states to pass inspection laws and bring within their reach articles of interstate and foreign commerce. However, it has been held that it is not within the legitimate scope of inspection laws to forbid trade based solely on the intrinsic nature and potential consequences of an article's use or abuse. For example, a state law prohibiting the importation of intoxicating liquors into a state could not be sustained as an inspection law.
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Supreme Court rulings
The Import-Export Clause, or Article I, § 10, clause 5 of the United States Constitution, prevents states, without the consent of Congress, from imposing tariffs on imports and exports above what is necessary for their inspection laws. It also secures for the federal government the revenues from all tariffs on imports and exports.
The adoption of the Import-Export Clause received considerable debate, more so than the Export Clause or the Commerce Clause. In Michelin Tire Corp. v. Wages (1976), the U.S. Supreme Court explained the purpose of this clause: the Framers of the Constitution sought to alleviate three main concerns by committing sole power to impose imposts and duties on imports to the Federal Government, with no concurrent state power. Firstly, the Federal Government must speak with one voice when regulating commercial relations with foreign governments. Secondly, tariffs, which might affect foreign relations, could be imposed more effectively by the federal government than by individual states. Finally, the federal government could more effectively impose tariffs on imports than the states could separately.
Several nineteenth-century Supreme Court cases applied the Import-Export Clause to duties and imposts on interstate imports and exports. In 1869, the United States Supreme Court ruled that the Import-Export Clause only applied to imports and exports with foreign nations and did not apply to imports and exports with other states, although this interpretation has been questioned by modern legal scholars.
In 1945, the Supreme Court held that the Import-Export Clause applied to imports from the Philippine Islands, which at the time was a territory of the United States. This ruling contradicted the argument that there is nothing in the Constitution or the records of the Constitutional Convention to suggest that the Import-Export Clause only applied to foreign goods.
In United States v. IBM (1996), the Supreme Court held that an excise on premiums paid to foreign insurers was unconstitutional as applied to insurance on exports. Similarly, in United States v. United States Shoe Corp. (1998), the Court held that a harbour maintenance "tax"—an excise on port use measured by cargo value—could not be imposed on vessels engaged in exportation.
In Brown v. Maryland (1827), the Court enunciated the original package doctrine, which states that goods imported do not lose their character as imports and become incorporated into the mass of state property until they have passed from the control of the importer or been broken up by him from their original cases. While retaining their character as imports, a tax upon them is within the constitutional prohibition.
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Frequently asked questions
The Import-Export Clause, or Article I, § 10, clause 5, of the United States Constitution, prevents states from imposing tariffs on imports and exports without the consent of Congress.
The Import-Export Clause was designed to limit the states' ability to interfere with commerce and prevent commercial strife between states.
In United States v. IBM (1996), the Supreme Court held that an excise tax on premiums paid to foreign insurers for exports was unconstitutional. The Court has also ruled that a "harbour maintenance tax" could not be imposed on vessels engaged in exportation.
The Import-Export Clause does not prohibit every tax that impacts imports or exports. It allows for inspection laws, which are deemed necessary to ensure the quality and merchantability of goods. Pilotage fees, license taxes, and annual license fees are also not considered duties on imports or exports.
The interpretation of the Import-Export Clause's application to interstate trade is disputed. The Supreme Court ruled in 1869 that it only applies to foreign trade, but modern legal scholars have questioned this interpretation.

























