Physical Nexus vs Economic Nexus: What Triggers Each

Physical nexus vs economic nexus comes down to this: physical nexus is a tax link created by something you own or do inside a state, like inventory, employees, or an office. Economic nexus is a link created by sales volume alone. Either one can obligate you to collect sales tax there.

Most sellers only learn the difference after a letter arrives from a state revenue department. This guide shows you what creates each type, where the gray areas are (remote workers, trade shows, third-party warehouses), and what to do next. It isn't legal or tax advice, so confirm specifics with a CPA.

What is the sales tax nexus definition?

Sales tax nexus is a sufficient connection between your business and a state that lets the state require you to register, collect, and remit sales tax. Without nexus, a state generally can't make you collect. With it, you must, even if you never set foot there.

For decades, nexus meant physical presence. The U.S. Supreme Court changed that in 2018 with South Dakota v. Wayfair, which allowed states to require collection from remote sellers based on economic activity. South Dakota's law, which the Court upheld, used a threshold of $100,000 in sales or 200 transactions, and many states copied it. You can read the background on Wikipedia's Wayfair article. Since then, nearly every state with a sales tax has adopted an economic standard.

So today nexus for online sellers comes in two flavors, and you can have both in the same state. Physical nexus has no sales threshold: one qualifying connection can be enough. Economic nexus has a threshold, and you can stay below it.

What creates physical presence nexus for ecommerce?

Physical presence nexus ecommerce sellers face is triggered by tangible ties to a state: property, people, or activities. Each state defines these slightly differently, but the common triggers are consistent.

• Inventory or property: goods stored in a warehouse, fulfillment center, or rented space.
• Employees or contractors: anyone working in the state on your behalf, including sales reps.
• Offices, stores, or showrooms: owned or leased.
• Affiliates or agents: in some states, people who solicit sales for you.
• Deliveries in your own vehicles: your truck, your driver.
• Installation or repair services: sending staff to set up what you sold.

Inventory in another state and sales tax

Inventory in another state creates sales tax nexus in that state, full stop. This catches many sellers off guard through Amazon FBA. When Amazon moves your stock between its fulfillment centers, you can pick up nexus in states you never chose. Amazon's seller help pages on tax collection explain that inventory placement can create obligations for you.

Here is how marketplace facilitator laws interact with this. Nearly every sales tax state now requires marketplace facilitators like Amazon to collect and remit tax on sales made through their platforms. So on an FBA order, Amazon usually handles the tax. But the facilitator law doesn't erase your nexus. Because your inventory sits in that state, you may still need to register there and collect tax on sales made elsewhere, such as your own website, even when Amazon collects on marketplace orders. Some states also require registration regardless, so check each one.

The same goes for a 3PL. If your third-party logistics partner stores your goods in Pennsylvania, you have physical nexus in Pennsylvania. Dropshippers face a different version of this problem, which we cover in our guide to dropshipping sales tax nexus.

Remote employee sales tax nexus

Remote employee sales tax nexus is real. One employee working from their home in Colorado can give you physical nexus in Colorado, even if the rest of your team is in Texas. States treat an in-state worker as proof you're doing business there.

That matters more now that hiring is location-flexible. Before you hire a designer, support rep, or contractor in a new state, check whether that state counts them. Payroll registration and sales tax registration are separate, so one doesn't cover the other.

Does working from home create nexus?

It depends on whose home. If you run your store from your house in your home state, you already have nexus there. That's expected. The question gets tricky if you move, or if you spend months working from a second home in another state.

A founder who relocates to Oregon, which has no sales tax, usually creates no sales tax obligation there. But a founder who spends the summer working from a lake house in Michigan might. Duration, activity, and storage of goods all matter. When in doubt, ask a tax professional before you stay long.

Affiliate and click-through nexus

Click-through nexus, also called affiliate nexus, comes from in-state people who refer customers to you for a commission. New York pioneered it in 2008: a seller is presumed to have nexus if residents link to the seller's site and earn commissions, and the seller's sales from those referrals exceed $10,000 in a year. Several other states adopted similar rules, and some set their own dollar limits.

The rules vary a lot. Some states require a written agreement, some count only referrals with a direct link, and some have repealed their laws after Wayfair. If you run an affiliate or influencer program, list where your top partners live and check those states. A partner who also stocks or delivers your goods is a stronger trigger than a simple link.

Trade show sales tax nexus

Trade show sales tax nexus is usually temporary but can still bite. Many states require a temporary seller's permit if you sell at a booth, and some treat even one event as enough to create nexus for that sale.

• Selling at the booth: you generally need a temporary permit and must collect tax on those sales.
• Only taking orders or showing samples: rules vary; some states count this as solicitation.
• Frequent shows in one state: repeated presence can look like ongoing nexus.

Check the state revenue department's page for the show location a few weeks ahead. Show organizers often publish permit instructions for vendors.

How does economic nexus work for online sellers?

Economic nexus applies when your sales into a state pass a threshold, even with zero physical presence. The most common threshold is $100,000 in sales or 200 transactions in a calendar year, the standard set in South Dakota's law and upheld in Wayfair. Details differ by state.

Some states have dropped the transaction count, and a few use higher dollar limits. California and Texas, for example, set the bar at $500,000 in sales, according to each state's tax agency (the California Department of Tax and Fee Administration and the Texas Comptroller). Because states change these numbers, verify before you rely on them. Our state economic nexus thresholds chart lists the current number for every state, and our explainer on economic nexus for online sellers covers when to register.

Two things trip people up. First, thresholds count gross sales into the state, often including exempt sales and marketplace sales, depending on the state. Second, collection start dates differ. Some states want you to start collecting on the very transaction that crosses the line. Others give you until the first day of the next month, or the start of the next calendar year. Missing that window means you owe tax you never collected from customers.

A worked example: crossing a threshold

Say you sell candles from Texas with no staff or stock outside the state. By the end of September, you've shipped these orders to Ohio customers:

• Jan to Jun: 90 orders totaling $48,000
• Jul to Sep: 85 orders totaling $44,000

That's 175 orders and $92,000. You're under both limits. In October, a holiday promotion brings 40 more orders for $19,000. Now you're at 215 orders and $111,000, so you passed the $100,000 line (and the 200-order line) during October. Depending on the state's rules, you'd need to register and begin collecting immediately or from a set date soon after. Ohio's current rules should be checked on the state's tax site, because it's the exact dates that decide what you owe.

If you'd also stored $5,000 of inventory in an Ohio 3PL from day one, you'd have owed tax on every Ohio sale since that date, not just after October. That's the difference between the two types in dollars.

Physical nexus vs economic nexus: side-by-side

The table below summarizes how the two compare in practice.

Factor	Physical nexus	Economic nexus
Trigger	Property, people, or activity in the state	Sales or transactions above a threshold
Threshold	None; one connection can be enough	Typically $100,000 or 200 transactions; varies
Examples	Inventory in a 3PL, remote employee, trade show booth	Shipping $120,000 of goods to Ohio customers
Easy to miss?	Yes, especially via FBA and remote hires	Yes, if you don't track sales by state
Can you avoid it?	Yes, by choosing where goods and staff sit	Only by staying under the limit

The practical takeaway: physical nexus is something you choose (even if by accident), while economic nexus is something your success triggers. Growth sellers usually hit both.

What should you do once you have nexus?

Once you have nexus in a state, register for a sales tax permit there, collect the right rate from buyers, and file returns on time. Don't skip registration, because collecting tax without a permit is a violation in most states.

1. Map your footprint. List every state where you have inventory, staff, contractors, or regular events.
2. Pull sales by state. Export 12 months of orders and total gross sales and order counts per state.
3. Compare against thresholds. Flag states you've crossed or will cross within a quarter.
4. Register. Our guide on whether you need a sales tax permit to sell online walks through it.
5. Collect and file. Follow the steps in how to collect and file sales tax for an online store.
6. Check back past exposure. If you crossed a line months ago, many states offer voluntary disclosure programs that reduce penalties.

For multi-state volume, manual tracking breaks down fast. Tools covered in our roundup of sales tax automation for ecommerce handle rates, filings, and threshold alerts. The IRS website covers federal obligations, but sales tax is a state matter, so each state's department of revenue is your source of truth.

Common questions

Can you have nexus in a state with no sales tax? You can have a connection, but there's no sales tax to collect in Delaware, Montana, New Hampshire, or Oregon, so there's nothing to register for.

Does physical nexus override the threshold? Yes. If you have physical nexus, you collect from the first dollar, regardless of the economic limit.

Do marketplace sales count? Marketplace facilitators like Amazon and Etsy collect tax on sales they process. But those sales may still count toward your threshold in some states, and your own-site sales are your responsibility.

Keep nexus manageable as you grow

Nexus gets harder as you add states, warehouses, and hires, so build tracking into your store early. Your platform should give you sales by state and tax settings you can change without a developer.

If you're launching or rebuilding, Rovela builds a complete store from a plain-language conversation, with Stripe checkout, analytics, and an admin dashboard included in one flat subscription, so you can see orders by state from day one. See Rovela's pricing or start at rovela.ai. Whatever you pick, set up your nexus review now. It's far cheaper than a back-tax bill.