Economic Nexus

Nexus is the connection between a taxpayer and a state sufficient to allow that state to impose a tax or collection obligation. Economic nexus establishes that connection based on economic activity - sales volume or transaction count - without requiring physical presence in the state.

The concept reshaped state tax compliance with the Supreme Court's 2018 decision in South Dakota v. Wayfair, which overruled the physical presence requirement previously established in Quill. Following Wayfair, nearly every state with a sales tax enacted economic nexus thresholds, most commonly $100,000 in in-state sales in the current or prior calendar year, though thresholds range upward to $500,000 in the largest states. Many states initially paired a dollar threshold with a transaction count, and a number have since removed the transaction test after recognizing it captured small sellers with negligible revenue.

Economic nexus also applies to income and gross receipts taxes through factor-presence standards, under which exceeding a specified amount of in-state sales, property, or payroll creates a filing obligation. Public Law 86-272 continues to shield sellers of tangible personal property whose only in-state activity is solicitation of orders, but states have aggressively narrowed that protection - asserting, for example, that internet cookies, post-sale customer support through a website, and remote employees defeat the immunity.

The practical burden is registration and filing across many jurisdictions simultaneously. A mid-sized company selling nationally can trip thresholds in dozens of states within a single growth year, each with its own registration process, filing frequency, taxability rules, and local jurisdiction layers. Nexus studies - mapping revenue and activity by state against current thresholds - have become standard recurring work for CPA firms, alongside remediation of historical exposure once a filing obligation is discovered late.