Understanding State Sales Tax Nexus: From Quill to Wayfair and the Rise of Economic Nexus

For decades, state sales tax compliance was relatively simple for remote sellers. If a business had a physical location, employees, inventory, or some other tangible connection to a state, it generally had an obligation to collect and remit that state's sales tax. If it lacked a physical presence, the seller often escaped collection responsibilities altogether.

The growth of e-commerce changed everything. Online retailers could sell millions of dollars and high volumes of products into states where they had no offices, employees, or property, leaving states unable to collect sales tax revenue. The resulting legal battle culminated in one of the most significant state tax decisions in over two decades: South Dakota v. Wayfair, Inc.

Today, virtually every business selling across state lines must understand economic nexus, because physical presence is no longer required to create a sales tax collection obligation.

The Physical Presence Rule

Prior to Wayfair, the Supreme Court had opined in two cases, National Bellas Hess, Inc. and later Quill Corp. Quill sold office supplies nationwide through catalogs and telephone orders but had no employees or property in North Dakota. The Court held that requiring Quill to collect sales tax would violate the Commerce Clause because the company lacked a substantial physical presence in the state. The Quill decision established what became known as the physical presence rule. For more than two decades, businesses could often avoid collecting sales tax simply by locating outside a customer's state.

The Internet Changed the Marketplace

When Quill was decided in 1992, the extent of out of state commerce was catalog sales. Amazon had not yet been founded, and online commerce was years from becoming the norm. As internet sales exploded, states argued that the physical presence rule created an unfair competitive advantage for remote sellers over local businesses that were required to collect sales tax. Consumers technically owed use tax on untaxed remote purchases, but compliance was extremely low. States estimated that billions of dollars in tax revenue went uncollected each year. Recognizing the growing problem, many states enacted laws directly challenging Quill, hoping to create a test case for the Supreme Court.

The Wayfair Decision

That opportunity arrived in South Dakota v. Wayfair, Inc., 585 U.S. 278 (2018).

South Dakota enacted legislation requiring remote sellers to collect sales tax if they had More than $100,000 of annual sales into South Dakota, or 200 separate transactions into the state during the year. Wayfair, Overstock, and Newegg challenged the law, arguing that they lacked physical presence. The Supreme Court disagreed. In a landmark decision, the Court expressly overruled Quill, holding that physical presence is not required to establish substantial nexus under the Commerce Clause. Instead, a business's economic contact with a state may be sufficient to require tax collection.

The Court concluded that substantial sales into a state create meaningful economic participation in that state's marketplace, justifying collection responsibilities. The decision fundamentally transformed state sales tax compliance.

What Is Economic Nexus?

Within a few years of the Wayfair decision, economic nexus statutes were passed in all 45 states that impose a state sales tax. Economic nexus refers to a business's obligation to collect sales tax based solely on the volume of sales or transactions within a state, even when the seller has no physical presence there. Unlike physical nexus, which arises from employees, inventory, offices, or property, economic nexus depends entirely upon economic activity. Although Wayfair upheld South Dakota's $100,000 or 200-transaction threshold, states were free to adopt their own standards. Nearly every state with a sales tax now has some form of economic nexus statute.

While many jurisdictions initially copied South Dakota's model, numerous states have since eliminated transaction-count thresholds and rely solely on annual sales volume.

Current Economic Nexus Thresholds

Although every state is unique, several common patterns have emerged:

Threshold Category

States Following This Model

$100,000 sales only

Most sales tax states

$250,000 sales only

Alabama and Mississippi

$500,000 sales only

California, New York, and Texas

Florida's Economic Nexus Law

Florida adopted economic nexus effective July 1, 2021. Remote sellers with more than $100,000 of taxable sales into Florida during the previous calendar year generally must register, collect, and remit Florida sales tax and applicable discretionary sales surtax. Unlike South Dakota's original statute, Florida does not impose a transaction-count threshold, making compliance relatively straightforward for remote sellers.

The New Reality of Multistate Compliance

The post-Wayfair landscape has dramatically increased compliance obligations for businesses selling nationwide. A company operating from a single office may now have filing responsibilities in dozens of states based solely on internet sales. Monitoring sales volume, tracking nexus thresholds, understanding marketplace facilitator rules, and properly sourcing transactions have become critical components of tax compliance.

Businesses that delay registration after crossing economic nexus thresholds may face assessments for tax, penalties, and interest, even when customers have already paid the purchase price. For businesses that may have exposure, there are mechanisms to limit the states lookback period, and penalty imposition.

Conclusion

The Supreme Court's decision in South Dakota v. Wayfair fundamentally reshaped state taxation by replacing the physical presence rule with a broader economic nexus standard. Today, businesses selling across state lines must monitor not only where they operate, but also where they generate revenue.

As e-commerce and digital services continue to expand, economic nexus remains one of the most significant—and rapidly evolving—areas of state and local tax law. Regular nexus reviews and proactive compliance planning can help businesses avoid costly assessments while confidently expanding into new markets.

If your business is selling across state lines, and you would like to discuss concerns about multi state nexus, contact Ribeiro Law for a free consultation.