
Nexus refers to a connection or link between things. In the context of law, it often refers to the level of minimum contacts that an entity has with a state, which can be used to establish jurisdiction and tax liability. While the specific definitions and rules vary across states and change constantly, the creation of nexus laws has important implications for businesses operating in multiple states, as it can determine their tax obligations and compliance requirements. The evolution of nexus laws and their interpretation by courts, such as in the Quill and Wayfair cases, reflect the ongoing efforts to adapt taxation policies to the changing business landscape, including the rise of e-commerce and remote selling.
| Characteristics | Values |
|---|---|
| Definition | Nexus means a connection or link between things. In case law, it refers to the legality of a governmental restriction and whether the means of restriction is justifiable in light of the right being restricted. |
| Types | Physical, economic, and affiliate. |
| Nexus Rules | States have created laws that allow them to extend their tax base to include people with substantial contacts within their state. |
| Affiliate Nexus Laws | An out-of-state business establishes a physical nexus through in-state employees or representatives. |
| Economic Nexus Threshold | States may set their own thresholds, typically $100,000 in sales or 200 separate transactions, to determine if a business has nexus and is subject to sales tax. |
| Cookie Nexus | The assertion of "physical presence" due to cookies placed on a customer's computer, creating a potential nexus for tax purposes. |
| Nexus Determination | Controlled by the US Constitution, requiring a definite link or minimal connection between a state and the entity it taxes, with substantial presence. |
| Nexus and Taxation | Without federal law, states have free reign to create nexus laws and tax out-of-state entities they deem to have contact with the state. |
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What You'll Learn

Nexus law and its three types: physical, economic, and affiliate
Nexus, in case law, refers to the connection between a state and an entity it wants to tax. Nexus laws are determined by the U.S. Constitution, which requires a definite link or minimal connection between a state and an entity for taxation. There are three main types of nexus: physical, economic, and affiliate.
Physical nexus refers to a physical presence in a state, such as employees, independent contractors, vendors, or other third parties. This type of nexus has been the traditional basis for taxation, with states asserting their taxing authority over businesses or individuals with a physical connection to the state. Physical nexus can also be established through "cookies", which are bits of code stored on a website visitor's computer. For example, in Massachusetts, a merchant can create a physical nexus by placing cookies on a customer's computer, combined with exceeding a certain transaction threshold.
Economic nexus, on the other hand, focuses on economic presence or activity in a state. This type of nexus has gained prominence in recent years, with the Supreme Court overturning the physical presence rule in South Dakota v. Wayfair in 2018. This decision allowed states to impose sales tax obligations on businesses without a physical presence in the state. Economic nexus is typically determined by sales revenue or transaction volume thresholds, such as $100,000 in sales or 200 separate transactions, as seen in the Wayfair case.
Affiliate nexus involves out-of-state businesses with ties to affiliates or representatives in a state. This includes businesses with similar product lines, business names, or promotional activities conducted by in-state employees or representatives. Approximately 30 states have affiliate nexus laws, imposing sales tax obligations on businesses that meet certain criteria. Affiliate nexus laws vary from state to state, and they may not always require common ownership or include sales-related activities.
It is important to note that the interpretation and application of nexus laws vary across states, and there is no federal law that preempts state nexus legislation. This lack of standardization can create challenges for multistate businesses in understanding and complying with the tax obligations in different jurisdictions.
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Nexus law in case law
The term 'nexus' in case law refers to a connection. In legal contexts, nexus often appears when discussing the legality of a government restriction and whether the means of restriction is justifiable in light of the right being restricted. A nexus is often required to establish jurisdiction, apply conflict-of-law issues, establish due process in criminal cases, and prove causation.
In the context of taxation, nexus determination is primarily controlled by the U.S. Constitution, which requires a definite link or minimal connection between a state and the entity it wants to tax. States have pushed back and created laws that allow them to extend their tax base to include people with substantial contacts with their state, both physical and otherwise. For example, various states have instituted affiliate nexus laws, where an out-of-state business establishes a physical nexus through in-state employees or representatives.
In federal obstruction of justice cases, establishing a nexus between a defendant's actions and an official proceeding is crucial. Defense attorneys can challenge the existence of a nexus by scrutinizing the prosecution's evidence and questioning the intent behind the defendant's actions. They can also prove a lack of nexus by gathering evidence that shows the actions in question were unrelated to any official proceedings. Case law is important in these cases, as it provides legal precedents that define and interpret the concept of nexus.
The Supreme Court's decision in Wayfair v. South Dakota is a notable example of nexus law in case law. The Court eliminated the physical presence standard, allowing for looser interpretations of what constitutes an economic nexus. This decision has had a significant impact on state taxation policies, with many states setting a threshold of $100,000 in sales or 200 separate transactions as their economic nexus standard.
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Nexus law and multistate taxation
At its core, the concept of "nexus" refers to a connection between a business and a state, which triggers tax obligations. This connection can be established through physical presence, economic activity, or other factors. While the specific criteria for levying taxes vary across states, the U.S. Constitution's Due Process Clause requires a definite link or minimal connection between a state and the entity it taxes.
One of the most significant developments in nexus law and multistate taxation was the Supreme Court's decision in South Dakota v. Wayfair. This case eliminated the strict physical presence rule, allowing states to assert nexus based on economic activities alone. The Court's ruling set a precedent, with many states adopting similar economic thresholds for taxation. As of January 1, 2023, all states with a sales tax have implemented Wayfair bright line economic nexus laws, requiring companies exceeding a certain threshold (typically $100,000 in sales) to register and collect sales tax.
The shift towards economic nexus laws has been a game-changer for multistate taxation. Previously, under the Quill v. North Dakota ruling, a physical presence was required to establish a nexus. However, with the rise of the internet and digital commerce, states sought new ways to tax businesses without a physical presence. The Wayfair decision expanded the scope of nexus, and states now have greater flexibility in defining what constitutes an economic nexus.
While the expansion of nexus laws gives states more power to tax out-of-state entities, it also creates challenges for businesses. Multistate businesses must navigate a complex web of varying state laws and regulations, ensuring compliance with sales tax rules and other tax types. This dynamic landscape underscores the importance of understanding state nexus laws to make informed decisions about expansion and tax liability.
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Nexus law and the U.S. Constitution
Nexus, in case law, refers to a connection. It is often required in all types of cases to establish jurisdiction, apply conflict-of-law issues, establish due process in criminal cases, and prove causation. Nexus determination is primarily controlled by the U.S. Constitution, wherein the Due Process Clause requires a definite link or minimal connection between a state and the entity it wants to tax, and the Commerce Clause requires a substantial presence.
In South Dakota v. Wayfair, the Court eliminated the physical presence rule within the Commerce Clause as the standard for creating nexus in a jurisdiction. However, physical presence is still the first consideration in determining nexus. In the lead-up to the Court's decision, many states enacted new types of economic nexus legislation to address how sellers conduct business today. There is no specific shared definition of nexus across the 50 states. Moreover, definitions and rules for determining nexus change constantly, and most states are careful to give themselves room to manoeuvre in their definitions.
The case of South Dakota v. Wayfair established what would be considered acceptable to the Federal Courts as being constitutional. Therefore, a majority of states have set $100,000 in sales or 200 separate transactions as their threshold. These definitions, which focus on having a business presence in a state, are just starting points for determining nexus. There are innumerable details, timescales, vagaries, and state-by-state idiosyncrasies involved. If a business has knowingly or unknowingly created nexus in a state, then it is subject to some very strict obligations.
Click-Through Nexus legislation typically requires that a remote seller meets a minimum sales threshold in the state in question, resulting from the activities of an in-state referral agent. Affiliate Nexus legislation typically requires that a remote retailer holds a substantial interest in, or is owned by, an in-state retailer, and the retailer sells the same or a substantially similar line of products under the same or a similar business name. The in-state facility or employee is used to advertise, promote, or facilitate sales to an in-state consumer. Marketplace Nexus legislation typically means that if an online marketplace operates its business in a state and provides e-commerce infrastructure, customer service, payment processing services, and marketing, the marketplace facilitator is required to register and collect tax as the retailer.
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Nexus law and the Supreme Court decision of Wayfair v. South Dakota
Nexus refers to a connection in case law, often required to establish jurisdiction. In the context of taxation, it refers to the connection between a state and a business that allows the state to impose tax obligations on the business.
In South Dakota v. Wayfair, Inc., 585 U.S. ___ (2018), the Supreme Court held that states may charge tax on purchases made from out-of-state sellers even if the seller does not have a physical presence in the taxing state. This decision overturned the previous ruling in Quill Corp. v. North Dakota (1992), which had established that the Dormant Commerce Clause barred states from compelling retailers to collect sales or use taxes from mail order or internet sales made to their residents unless the retailer had a physical presence in the taxing state.
The growth of e-commerce since the Quill decision in 1992 had led to states losing billions in taxes that they could not collect. In the lead-up to the Wayfair decision, many states enacted new types of economic nexus legislation to address the changing nature of business. South Dakota was the first state to make its case through the lower courts to the Supreme Court. The Supreme Court granted a writ of certiorari in January 2018, heard the case in April 2018, and issued its decision in June 2018.
The Court's decision in Wayfair eliminated the physical presence standard and allowed for looser interpretations of what constitutes an economic nexus. The Court, however, did not adopt a stringent standard for determining economic nexus. Instead, it upheld the state statute, which stated that economic activity generating over $100,000 constitutes a significant nexus-creating activity. This decision gave states more flexibility in defining nexus and imposing tax obligations on out-of-state businesses.
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Frequently asked questions
Nexus law refers to the laws that govern the link or connection between two things. In the case of US law, it refers to the minimum contacts a business or entity has with a state. These contacts can be physical, economic, or affiliate.
The term 'nexus' comes from the Latin word for 'to bind' and has been used to refer to a connection or link since ancient times. In Roman law, a 'nexus' was a person who owed money and was given in bondage to their creditors until the debt was paid. Today, the term 'nexus' is often used in law to describe the connection between two things, such as the link between smoking cigarettes and lung cancer.
In the US, the Due Process Clause requires a definite link or minimal connection between a state and the entity it wants to tax. This is known as the nexus. States have created laws that allow them to extend their tax base to include people with substantial contacts with their state, whether physical or otherwise. This has resulted in varying definitions and rules for determining nexus across different states.
There is currently no clear answer to this question. While the Supreme Court's decision in Wayfair v. South Dakota addressed the issue of nexus and taxation, it did not specifically address the retroactive application of economic nexus provisions.


































