Taxes & Entities

Sales Tax Nexus

Sales tax nexus is the connection that forces a business to collect a state's sales tax — historically requiring physical presence, but rewritten by e-commerce so that an online seller can now owe collection obligations in dozens of states it has never entered, a vivid case of how structural change abruptly rewrites the ground rules of business.

  • Beginner
  • 10 min total
  • 12 chapters

What decision this helps you make: How to think about sales tax nexus across a patchwork of jurisdictions — and, more broadly, how to notice when the ground rules you operate under are being rewritten by structural change.

What this topic is

The connection between a business and a state sufficient to require collecting that state's sales tax — once physical presence, now (after Wayfair) also purely economic activity.

Why it matters

It determines how many of thousands of separate tax jurisdictions a business must deal with — and e-commerce rewrote the rules so online sellers owe tax in states they never entered.

Who should learn it

Anyone selling across state lines (especially online), and anyone learning how structural shifts abruptly rewrite the rules of business.

What you will understand

  • Nexus is the connection that triggers sales-tax collection duties
  • Historically it required a physical presence in the state
  • E-commerce and Wayfair (2018) added purely economic nexus
  • The rules of business are downstream of a changeable reality

Prerequisites

Common misconception

"I only have to collect sales tax in the state where my business is physically located." That was largely true before 2018 — but the Wayfair decision created economic nexus, so an online seller can owe sales-tax collection in any state where it crosses a sales or transaction threshold, with no physical presence at all. The old rule you grew up with was rewritten.