Do You Have Sales Tax Nexus? What Growing Retailers Need to Watch in 2026
If your store has grown beyond your home state, whether that's through online sales, a second location, or a marketplace like Amazon or Etsy, there's a good chance you've picked up a new responsibility without realizing it: sales tax nexus in another state.
Nexus rules have gotten more complex over the past few years, and enforcement is only getting sharper in 2026. Here's what retail business owners need to know to stay ahead of it.
What Sales Tax Nexus Actually Means
Nexus is simply the connection between your business and a state that's strong enough to require you to collect and remit sales tax there. Once you have nexus in a state, you're on the hook to register, collect the right rate, and file returns, even if your business is headquartered somewhere else entirely.
There are two main roads that lead to nexus.
Physical nexus is the more familiar one. If you have a storefront, a warehouse, inventory sitting in a fulfillment center, or even an employee who lives in another state, you likely have physical nexus there.
Economic nexus is newer and easier to trigger without noticing. Since the Wayfair Supreme Court decision, states can require out of state sellers to collect tax once sales into that state cross a certain dollar amount or transaction count, commonly $100,000 in sales or 200 transactions in a calendar year, though thresholds vary by state.
Where Retailers Get Caught Off Guard
A few scenarios trip up retail owners more than any others:
Storing inventory in a third party fulfillment center. If you sell through Amazon FBA or a similar service, your inventory may be sitting in warehouses in states you've never set foot in, and that alone can create nexus. This is also where aligning your purchasing with actual profitability matters, since inventory spread across multiple states adds a layer of tax exposure on top of the usual stocking tradeoffs.
Crossing an economic threshold without tracking it. It's easy to watch total revenue climb without realizing how much of it is landing in any single state. By the time you notice, you may already owe back taxes and penalties.
Assuming a marketplace handles it for you. Many marketplace facilitator laws do shift collection responsibility to platforms like Amazon or Etsy for sales made through them. But that doesn't always cover sales through your own website, and it doesn't remove your registration obligations in every state.
What to Do About It
The good news is that staying ahead of nexus doesn't require guesswork, just a bit of regular attention.
Review where you have nexus at least twice a year. Pull a report of sales by state and compare it against economic thresholds. If you're using fulfillment centers, check which states hold your inventory.
Keep documentation of your nexus decisions. If a state ever asks why you didn't register somewhere, having a record of when and how you evaluated your exposure goes a long way.
Consider sales tax automation. Tools that integrate with your accounting and ecommerce platforms can calculate tax, track threshold changes across states, and flag when you're getting close to a registration requirement.
Loop in your bookkeeping team early. Sales tax nexus isn't something to solve after a state sends a notice, the same way you wouldn't want to wait until tax season to think about deductions and compliance. The earlier it's part of your regular financial routine, the smaller the risk of a costly surprise down the road.
Keeping Your Business on the Right Path
Growth is a good problem to have, but it does mean the rules around your business change as you go. A little proactive attention to where you're selling, and where that creates obligation, keeps your retail business compliant without slowing down the momentum you've built.
If you're not sure where your business currently stands with nexus, or you just want a second set of eyes on your multi-state sales, we're happy to help you map it out. Learn more about how we support retail businesses.