In its 2018 decision in South Dakota v. Wayfair, the U.S. Supreme Court upheld South Dakota’s “economic nexus” statute, expanding the power of states to collect sales tax from remote sellers. Today, nearly every state with a sales tax has enacted a similar law, so if your company does business across state lines, it’s a good idea to reexamine your post-Wayfair sales tax obligations. What’s nexus? A state is constitutionally prohibited from taxing business activities unless those activities have a substantial “nexus,” or connection, with the state. Before Wayfair, simply selling to customers in a state wasn’t enough to establish nexus. The business also had to have a physical presence in the state, such as offices, retail stores, manufacturing or distribution facilities, or sales reps. In Wayfair, the...