Navigating the Post-Wayfair Tax Maze: What’s Happening, What’s Next, and What’s at Stake


Considerable changes to sales tax laws in more than two dozen states continue to challenge online retailers, who must swiftly comply with a complex and shifting network of regulations.

It has been nine months since the U.S. Supreme Court’s landmark South Dakota v. Wayfair, Inc. decision, which determined that sales to customers in a state alone are sufficient to create an obligation to collect the state’s sales tax. The decisions gave each state the freedom to set their own thresholds and enforcement dates, even potentially retroactively.

So far, more than 35 states have enacted measures to reap the benefits of Wayfair. The states that have yet to modify their tax laws could enact legislation at any time or may believe their laws already require out of state vendors to collect sales tax.

At issue in Wayfair was South Dakota’s 2016 legislation that relied on a two-tiered nexus test. It required retailers with no physical presence in the state to collect sales taxes if they deliver $100,000 or more in goods or services into the state or if they engage in 200 or more retail transactions that result in the delivery of goods in the state.

Many states that have adopted out-of-state sales tax obligations have followed the two-tiered nexus test used in South Dakota, perhaps to ensure that their laws pass muster with any future potential challenges. But the parameters of nexus tests often vary from state to state. Among the states that require out-of-state vendors to collect sales tax:

The Wayfair decision—and the new measures resulting from it—will mean increased tax revenue for states. According to statistics cited by the Court, South Dakota lost as much as $58 million annually under the previous standard—set by Quill Corp. v. North Dakota, which essentially exempted online retailers from collecting state sales tax in states where they had no physical presence. On a national level, the Government Accountability Office estimated uncollected e-commerce revenue to be between $8 billion to $13 billion.

But the increased compliance burden comes at a price for online retailers. Software programs have been created to help online retailers navigate the constellation of state and local sales tax requirements, as well as laws involving special tax districts. But that software can be expensive, increasing costs for small or specialty retailers.

Ballard Spahr’s Tax Group, in its initial report on Wayfair, noted that the decision left open two important questions:


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National Law Review, Volume IX, Number 88