What Economic Nexus Means and Why It Matters

You can owe sales tax in a state you have never set foot in. Here is how that works.

September 3, 2026 · 3 min read

Presence is no longer only physical

Sales tax obligations used to depend mostly on physical presence. Now, selling enough into a state can create an obligation there on its own. This is economic nexus, and it changed the rules for online sellers.

Thresholds vary by state

Each state sets its own threshold, often based on sales volume or number of transactions. Cross it, and you are expected to register, collect, and file in that state, even with no office or warehouse there.

Growth can trigger it quietly

A strong sales period can push you over a threshold without any warning. Because it happens through normal growth, it is easy to miss until you are already behind on an obligation.

Track your exposure

The safe approach is to watch your sales against each state's threshold, so you can register on time rather than discovering the obligation after the fact. Awareness is most of the battle.

Key takeaways

Enough sales can create a tax obligation with no physical presence
Each state sets its own nexus threshold
Normal growth can trigger it without warning
Track sales against thresholds to stay ahead

Written by

Julien Jimenez

Julien Jimenez is an independent software builder based in Paris. He designs, ships, and operates focused SaaS products for small businesses and independent professionals. Read the full author page.