What Is Economic Nexus? A Guide for Ecommerce and Amazon Sellers

QUICK ANSWER

Economic nexus is the connection that requires an out-of-state business to register for, collect, and remit sales tax in a US state once its sales into that state cross a set threshold — most commonly $100,000 in sales or 200 transactions in a year — even when the business has no physical presence there. It was created by the 2018 Supreme Court ruling South Dakota v. Wayfair. All 45 states that charge sales tax, plus Washington, D.C., now enforce it.

→  Common trigger: $100,000 in sales or 200 transactions per year in a state

→  Higher-revenue states: California, Texas, New York ($500,000)

→  Both tests required: only New York and Connecticut make you meet a dollar AND a transaction test

→  No statewide sales tax: Delaware, Montana, New Hampshire, Oregon (Alaska has local rules)

Economic nexus is the reason a seller in Austin can owe sales tax in twenty states they have never set foot in. If you sell online — on Amazon, Shopify, Walmart, or your own store — your sales into a state can create a legal duty to collect that state’s sales tax, with no warehouse, office, or employee required.

Since the Supreme Court’s 2018 decision in South Dakota v. Wayfair, every state with a sales tax measures your activity and switches on that duty the moment you cross its threshold. For fast-growing brands and international sellers expanding into the US, that can mean obligations in a dozen states before anyone on the team notices. This guide explains what economic nexus is, how the thresholds work, where each state stands in 2026, what happens if you ignore it, and exactly how to get compliant — including how to clean up the past.

What is economic nexus?

Economic nexus is a connection between your business and a US state, created by your economic activity in that state — the dollar value or number of your sales — rather than by any physical presence. Once your sales into a state pass its threshold, you are legally required to register for a sales tax permit, collect the correct sales tax from customers there, and remit it to the state.

The key word is economic. Before 2018, a state could only make you collect sales tax if you had a physical tie to it. Economic nexus removed that requirement for remote sellers: cross the sales or transaction line, and the obligation follows — regardless of where you or your inventory sit. Because it turns on volume rather than location, it catches exactly the businesses that scaled fastest online.

Economic nexus vs physical nexus (and the other triggers)

“Nexus” simply means a connection strong enough for a state to tax you. There are two main kinds, and a handful of narrower ones worth knowing:

Two points trip sellers up. First, physical and economic nexus stack — storing FBA inventory in a state can create physical nexus there even before you hit an economic threshold. Second, economic nexus is the one you’re most likely to trigger without realising, because nothing physical changes; only your sales figures do.

Where economic nexus came from: South Dakota v. Wayfair

For decades, the rule came from a 1992 case, Quill Corp. v. North Dakota, which said a state could only require sales tax collection from businesses with a physical presence inside its borders. Ecommerce made that rule look increasingly generous to remote sellers and costly to states.

On June 21, 2018, the US Supreme Court decided South Dakota v. Wayfair, Inc. and overturned Quill. The Court ruled that a state may require out-of-state, or remote, sellers to collect sales tax based on economic activity alone. South Dakota’s own trigger — $100,000 in sales or 200 transactions — became the template most states copied. Within a few years, essentially every sales-tax state had an economic nexus law on the books. If your compliance thinking still assumes “no office, no tax,” this is the ruling that ended it.

How economic nexus thresholds work

Every state sets its own economic nexus threshold, but they’re built from the same two ingredients:

• A sales (revenue) test — a dollar amount of sales into the state, most commonly $100,000.
• A transaction test — a number of separate sales, most commonly 200 transactions.

What matters is the logic connecting them. Most states use “or”: you trigger nexus by crossing either the dollar amount or the transaction count. A small number use “and” — today only New York and Connecticut — meaning you must cross both before you owe anything. And many states have no transaction test at all, so only the dollar figure counts.

Two more details matter. The measurement period is usually the current or previous calendar year (some states use a rolling 12 months), measured by ship-to state, not billing address. And the direction of travel is clear: states are steadily dropping the transaction test in favour of a dollars-only rule — Utah did so in July 2025, Illinois in January 2026, and Kentucky follows in August 2026 — good news for low-price, high-volume sellers who used to trip “200 transactions” long before $100,000.

What counts toward the economic nexus threshold?

This is where sellers most often miscalculate, because the figure that matters is usually broader than your taxable sales. In most states you measure gross sales into the state, and several categories you might assume are excluded actually count.

The practical trap: a business doing mostly exempt or wholesale sales can still cross a state’s line and owe registration, even if little or no tax is ultimately due. Because each state defines “sales” differently, always measure against the specific state’s rule before you conclude you’re under.

Economic nexus by state: 2026 thresholds

All 45 sales-tax states plus Washington, D.C. enforce economic nexus. As of 2026, 41 states use the $100,000 benchmark, two use $250,000 (Alabama and Mississippi), and three use $500,000 (California, Texas and New York). The table below covers the states sellers ask about most, including every exception to the standard rule.

Most states not listed use the standard $100,000 threshold, increasingly with no transaction test. Four states levy no statewide sales tax at all — Delaware, Montana, New Hampshire and Oregon — and Alaska has no statewide tax but local jurisdictions can still require collection. Thresholds change frequently; confirm the current figure with each state’s Department of Revenue — for example the California CDTFA or the Texas Comptroller — before you register.

A few worked examples show how different the rules feel in practice. Cross $100,000 into South Dakota and you have nexus. In California or Texas you have room to $500,000 before the dollar test bites. New York is the outlier: you need $500,000 in sales and more than 100 transactions — miss either and you don’t yet owe. This is why sellers with similar revenue can have obligations in wildly different sets of states.

Do Amazon and marketplace sales count?

This is the question Amazon and Shopify sellers really want answered, and the honest reply is: it depends, and the trap is real.

Under marketplace facilitator laws, platforms like Amazon, eBay, Etsy and Walmart are required to collect and remit sales tax on your behalf in most states. That removes a lot of day-to-day work — but it does not automatically remove your responsibilities:

• In many states, your marketplace sales still count toward your own economic nexus threshold, even though the marketplace is collecting the tax. California, Connecticut and others work this way.
• You may still be required to register and file returns in a state to report those sales, even at $0 tax due.
• The moment you sell the same products through your own website, you’re responsible for collecting tax on those direct sales in every state where you have nexus.
• Amazon FBA inventory stored in a state can create physical nexus there independently of any threshold.

In other words, “Amazon handles my tax” is rarely the whole story for a growing brand selling across channels.

Common economic nexus myths and mistakes

A handful of assumptions cause most of the trouble. If you catch yourself thinking any of these, look again:

✕  “Amazon collects for me, so I’m covered.”  →  those marketplace sales can still count toward your threshold, you may still need to register, and your own-website sales are entirely yours.

✕  “I’m under $100,000 in total, so I have no nexus.”  →  thresholds are per state, measured by ship-to. You can be small nationally and still cross a smaller state.

✕  “Only my taxable sales count.”  →  most states measure gross sales, often including exempt and wholesale.

✕  “No office or warehouse means no obligation.”  →  that is exactly what Wayfair overturned in 2018.

✕  “I’ll just start collecting from now on.”  →  uncollected past periods stay on the books as exposure — which is what a VDA (below) exists to fix.

Do you have economic nexus? A quick checklist

You don’t need software to get a first read. Work through this for each state you sell into:

✓  Pull your sales by ship-to state for the current and previous calendar year.

✓  Compare each state against both its dollar test and its transaction test.

✓  Add in your marketplace (Amazon, Walmart) sales for the states that count them.

✓  Check whether you hold inventory — FBA or a 3PL warehouse — anywhere, which can create physical nexus.

✓  Flag any state where you’re within 80% of either threshold; that’s your near-term watch list.

If more than a couple of states light up, the manual approach stops scaling — which is where a platform and a compliance partner earn their keep.

What happens if you don’t comply with economic nexus?

Economic nexus isn’t a courtesy the states wait for you to honour — they actively pursue remote sellers, and the cost compounds the longer it goes unaddressed. Ignoring it exposes you to five distinct risks:

• Back tax with no time limit. If you never registered or filed, most states’ statute of limitations never starts running — they can look back to the day you first crossed the threshold, often several years of tax.
• Penalties and interest. Late-filing and late-payment penalties plus interest routinely add 25% or more, and can more than double the original bill — a $10,000 liability can become $20,000+.
• Personal liability. Sales tax is a “trust fund” tax — money you collect on the state’s behalf — so in many states owners and officers can be held personally liable, and collected-but-unremitted tax can even carry criminal exposure.
• Marketplace risk. Unresolved tax issues can jeopardise your Amazon or other marketplace selling privileges.
• A deal-breaker at exit. Sales tax exposure is one of the most commonly missed liabilities in M&A; when a buyer’s due-diligence team finds it, it lowers your valuation or holds up the sale.

The reassuring part: exposure you find and fix yourself is almost always far cheaper than exposure a state finds first.

How to become sales-tax compliant: a step-by-step guide

Once you know where you have nexus, the path to compliant is the same in every state. Working through it in order — and quickly — keeps your exposure small.

1. Run a nexus study. Map your sales by ship-to state, plus any inventory locations, against every threshold. This tells you where you have obligations and, crucially, since when.
2. Clean up the past first, if needed. If the study shows you should have been collecting months or years ago, resolve that history with a voluntary disclosure agreement before you register (next section) — registering first can start the clock on back tax without capping it.
3. Register for a sales tax permit. In each state where you have nexus, before you start collecting — collecting without a permit is itself a violation. The deadline varies: some states want you registered by your next transaction, others give roughly 30–60 days. Selling into many states? The Streamlined Sales Tax system registers you across multiple member states at once.
4. Set up accurate collection. Rates are address-specific (state + county + city), so configure correct combined rates, map each product to the right taxability, and align your website and marketplace settings. Channel setup differs — Shopify and Amazon each have their own steps.
5. File and remit on schedule. States assign a frequency — monthly, quarterly or annually. File every period you’re registered, including “zero returns” when you owe nothing; missed filings trigger penalties on their own.
6. Monitor continuously. Nexus is never set-and-forget: new states, changing thresholds and rising sales all move your footprint. Track sales by state and watch the lines you’re about to cross.

That’s a lot to run in-house across dozens of states, which is exactly the work AVASK takes off your plate with US sales tax registration and filing.

Already behind? Fixing past exposure with a VDA

If your nexus study shows you should have been collecting in the past, don’t just quietly start collecting now — that leaves the back exposure sitting there for a state to find. The standard fix is a voluntary disclosure agreement.

A Voluntary Disclosure Agreement (VDA) is a deal you initiate with a state before it contacts you. In exchange for coming forward, states typically:

• limit the lookback period to about three to four years, instead of the unlimited period that applies when you never filed;
• waive penalties (interest is usually still due); and
• close the covered periods, so the state can’t reopen them later.

The catch is timing: a VDA is generally only available before the state reaches you, and filing prematurely can disqualify you — so sequence it correctly. For sellers exposed in several states, the Multistate Tax Commission runs a program that handles multiple states through one application. Done right, a VDA turns an open-ended, growing liability into a defined, one-time cost — and it’s a standard clean-up step before raising money or selling the business.

Economic nexus for international sellers

US economic nexus doesn’t care where your business is based — only where your customers are. If you’re a UK, EU or other non-US seller shipping into the US, the same rules apply to you as to a domestic seller.

• Same thresholds, no US presence needed. A foreign seller shipping to US customers triggers the same state thresholds. No US office, entity or bank account is required for the obligation to attach.
• You’ll usually need an EIN. To register and remit, foreign sellers generally need a US federal tax ID (EIN), which you can obtain without a US Social Security number.
• Sales tax is not VAT. It’s charged once, at the point of sale, by state and local governments, with no input-tax reclaim — and your home VAT registration does nothing for your US obligations.
• Marketplaces don’t remove the question. Selling into the US through Amazon raises the same facilitator and threshold issues it does for domestic sellers.

For overseas brands, US sales tax is one piece of a wider compliance picture. See how it fits when you’re expanding into the US.

How AVASK helps

Economic nexus is a monitoring problem before it’s a filing problem: the hard part is knowing, in real time, where your sales have quietly crossed a line. That’s the gap AVASK closes.

Our platform connects to your Amazon, Shopify and other sales channels and lets you track nexus in real time with Infiniti 3.0 — watching your sales by state against every threshold so nothing creeps up on you. When you do need to register, our specialists handle state registrations, calculations and ongoing filings for you. You get a compliance partner who owns the outcome, not just software that flags a number and leaves the work to you.

For international and cross-border brands, that combination is the difference between treating the US as one intimidating market and treating it as 46 manageable ones.

Economic nexus glossary

Frequently asked questions