For businesses operating across multiple states, understanding state tax nexus, sales tax compliance, and multistate tax exposure is critical to managing risk and avoiding unexpected liabilities. Under the U.S. Constitution’s Commerce Clause, the Supreme Court established in Complete Auto Transit v. Brady (1977) that a state tax is valid only if it satisfies a four-part test. The first and most foundational requirement is substantial nexus—a meaningful connection between the taxpayer and the taxing state.
Historically, this connection was interpreted through a physical presence standard, requiring businesses to have employees, offices, or inventory in a state before tax obligations could be imposed. This framework originated in National Bellas Hess v. Department of Revenue (1967) and was later reaffirmed in Quill Corp. v. North Dakota (1992). These decisions limited a state’s ability to require out-of-state businesses to collect and remit sales tax, even if significant sales were occurring within the state.
The modern tax landscape changed significantly with the Supreme Court’s decision in South Dakota v. Wayfair, Inc. (2018). The Court rejected the physical presence rule and held that economic nexus—based on revenue thresholds or transaction volume—can establish sufficient connection for tax purposes. Today, nearly every state has adopted some form of economic nexus standard, often requiring businesses to collect and remit tax once they exceed specified sales or transaction thresholds.
What This Means for Your Business
Businesses engaged in:
- Interstate commerce
- E-commerce / online sales
- Import/export operations
- Remote or digital service delivery
may now create nexus—and related tax obligations—without any physical presence in a state. This shift has significantly increased compliance requirements and audit exposure across jurisdictions.
Why Nexus Matters
Properly identifying your nexus footprint allows you to:
- Avoid unexpected tax assessments and penalties
- Ensure accurate sales and use tax compliance
- Proactively manage multistate income and franchise tax obligations
- Align tax strategy with operational growth and expansion
At The John Ellis Company, An Accountancy Corporation we help businesses navigate state and local tax (SALT) complexities with a focus on clarity, compliance, and long-term profitability.
If your business is expanding across state lines or generating revenue in new markets, a proactive nexus review can help protect your bottom line and prevent costly surprises.