Economic Nexus for Online Sellers: When to Register

Economic nexus for online sellers means a state can require your store to collect sales tax once your sales into that state pass a set threshold, even if you have no office, staff, or inventory there. In most states with a sales tax, that line is $100,000 in sales into the state (some also count 200 transactions). Cross it, and you must register.

This guide is for operators, not accountants. It covers the economic nexus rules online sellers face, the thresholds that matter, how to know when you've crossed one, and how to register without losing a week of your life. It's general information, not legal or tax advice. A CPA who knows multi-state work is worth paying once you're close to a threshold.

What Is Economic Nexus and Why Does It Exist?

Nexus is the connection between a seller and a state that gives the state the right to tax the sale. Economic nexus is the version based purely on sales activity, not physical presence.

It exists because of a 2018 U.S. Supreme Court decision, South Dakota v. Wayfair. Before it, the rule from the 1992 case Quill v. North Dakota said a state could only make you collect tax if you had a physical presence there. As e-commerce grew, states argued they were losing revenue on untaxed remote sales. The Court agreed and overturned Quill. You can read the background on Wikipedia's page on the Wayfair case.

The Wayfair ruling for small business

The Wayfair ruling for small business is the part people get wrong. The South Dakota law that the Court upheld had a small-seller safe harbor: $100,000 in sales or 200 transactions. The Court pointed to that as a reason the law wasn't an unfair burden. So small sellers aren't exempt. They just get a threshold below which they don't have to collect.

After Wayfair, states with a sales tax adopted their own economic nexus laws. Many copied South Dakota's numbers, but not all. Confirm the current status for each state on its revenue department site.

Physical nexus still counts

Economic nexus adds to physical nexus. It doesn't replace it. If you store inventory in a third-party warehouse, such as Amazon FBA, in Texas, you likely have physical nexus in Texas from the first dollar. Same for employees, contractors, or trade-show sales in some states. Check both types.

Sales Tax Nexus Thresholds by State

Most states set the economic nexus threshold at $100,000 in annual sales into the state, and some add a 200-transaction trigger. A handful of large states use higher dollar amounts, and five states have no state sales tax at all. Thresholds change often, so treat the table below as a pattern guide and confirm against the state's department of revenue before you act.

Threshold pattern	Example states	What triggers nexus
$100,000 in sales only	Illinois, Washington (Washington's figure is $100,000 in sales)	Sales into the state exceed $100,000
$100,000 or 200 transactions	Georgia (historically; some states have since dropped the count)	Either measure, depending on the state's current rule
$500,000 in sales	California, Texas	Sales into the state exceed $500,000
$500,000 and 100 transactions	New York	Both tests must be met
No state sales tax	Alaska (local taxes may apply), Delaware, Montana (resort/local taxes may apply), New Hampshire, Oregon	No state-level collection obligation

California and Texas are the high-threshold exceptions, not the norm. Because the details vary by state and change over time, don't rely on any list, including this one, for a filing decision. Alaska is a good example: it has no state sales tax, but some local jurisdictions do tax sales, and the Alaska Remote Seller Sales Tax Commission administers a remote seller system for participating localities. Also remember that no sales tax doesn't mean no tax: Montana, Oregon, and others still have income tax rules for your business.

The Streamlined Sales Tax Governing Board (SST) is a group of member states that simplify registration and rules, and it offers a single registration option across member states.

How to find a state's current threshold

1. Search "[state name] department of revenue economic nexus" and open the official .gov page.
2. Look for the "remote seller" or "marketplace" guidance page, which lists the dollar and transaction tests.
3. Note the measurement period and effective date, then record them in a simple tracking sheet.
4. Recheck each state you sell into at least once a year, since rules change.

Several states have dropped the transaction count over time, because it hit tiny sellers selling many low-priced items. Expect more changes.

What counts toward the threshold?

This varies, and it's where sellers get caught. Some states count gross sales, including exempt sales. Others count only taxable sales. Some include marketplace sales (Etsy, Amazon) and some exclude them. Read the definition for each state you're near.

• Gross vs. taxable: Many states count total sales into the state, even items you wouldn't tax.
• Marketplace sales: Some states exclude sales where the marketplace collected the tax; others include them for the threshold count.
• Measurement period: Calendar year, prior 12 months, or current plus prior year. The window differs by state.
• Shipping and digital goods: Taxability varies, and so can what counts toward the threshold.

When Must Ecommerce Sellers Register?

You must register once you cross a state's threshold, usually before your next sale, though some states give you a grace period of 30 to 60 days. Don't wait for a letter. Most states expect you to act on your own.

The timing rule that trips people up: in many states, the obligation starts with the sale that crosses the line, not the following January. In others, it starts the first day of the next month or the next period. If your store is growing fast, you can cross a threshold in a single holiday weekend.

A worked example of the nexus clock

Say you sell candles from Ohio, and a state you ship to has a $100,000 threshold. By September 30 you've shipped $72,000 there this calendar year. October adds $14,000, bringing you to $86,000. Black Friday weekend adds $16,000, and the order that pushes the total past $100,000 is the crossing sale. In a state that applies the obligation from that sale, every order after that point needs tax collected, and you'd need a permit already in hand. In a state that starts the first day of the next month, you'd have until December 1. Either way, waiting for January means back tax on weeks of sales you never charged for.

A practical trigger system

The following buffer is our own rule of thumb, not an official standard. It gives you lead time, since permits can take days to weeks to issue.

1. At 60% of any state's threshold: flag it. Read that state's rules and start gathering registration details.
2. At 80%: start the registration process. Some states take a week or more to issue a permit.
3. At 100%: you should already be collecting. Turn on tax collection for that state on your store.

In the candle example, $72,000 is 72% of the threshold. Under this system, registration begins well before the holiday rush.

What happens if you miss it?

You owe the tax anyway. If you didn't collect it from customers, it comes out of your margin. States can add penalties and interest, and the look-back period can reach back to the date you first crossed the threshold. Voluntary disclosure programs exist in many states and often reduce penalties, so contacting the state before it contacts you is usually the smarter move.

Remote Seller Sales Tax: Marketplaces and Your Own Store

Remote seller sales tax rules differ depending on where the sale happens. Nearly all states with a sales tax have marketplace facilitator laws, so if you sell on Amazon, Etsy, or eBay, the marketplace generally collects and remits tax for you. If you sell through your own website, the obligation is yours. Confirm your state's rule on its revenue department site.

These marketplace facilitator laws are why many sellers feel safe until they open their own store. Say you did $200,000 on Etsy and $60,000 on your own site. Etsy handles tax on its sales, but your own-site sales still count, and depending on the state, so might the marketplace sales toward the threshold. Your direct sales are what you'll have to collect on once you register. Details on how each state treats marketplace sales differ, so check the state's marketplace facilitator guidance.

Don't forget the origin state

Your home state almost always has nexus. Register there first. Then check how it sources sales: some states are origin-based (tax at your location's rate), others destination-based (tax at the buyer's rate). Destination-based states mean you apply local rates, and that's where sales tax gets complicated fast. The Tax Foundation tracks thousands of local sales tax jurisdictions in the U.S. in its state and local sales tax rates data.

Multi State Sales Tax for Ecommerce: A Step-by-Step Plan

Handling multi state sales tax for ecommerce comes down to five steps: measure sales by state, compare to thresholds, register, collect, and file. Done on a schedule, it's a few hours a month. Done reactively, it's a nightmare.

1. Pull sales by state. Export the last 12 months of orders, grouped by shipping destination. Note revenue and order count per state.
2. Compare to thresholds. Check each state's current rules. Note which count gross sales and which use a rolling period.
3. Confirm physical nexus. Inventory in a fulfillment center, a remote employee, or a pop-up market can create nexus in states you'd never expect.
4. Complete sales tax registration for your online store. Register on the state revenue department's website. It's free in most states. You'll need your business entity details, EIN, NAICS code, and an estimated sales figure.
5. Turn on collection and set up filing. Configure tax in your store, note your filing frequency (monthly, quarterly, or annual), and calendar the deadlines.

Tools that help

Software like Avalara, TaxJar (now part of Stripe), and Stripe Tax can monitor thresholds and calculate rates automatically. Stripe's documentation on Stripe Tax explains how monitoring and collection work. Prices vary by volume, so check each provider's pricing page.

If you're still choosing a platform, factor tax handling into total cost. A store that needs a paid app for tax, plus apps for everything else, adds up. Our guide to merchant website builder costs breaks down what those stacks really run.

Common Mistakes Online Sellers Make With Nexus

The most common mistakes are ignoring the problem until a notice arrives, assuming marketplaces cover everything, and charging tax without registering first. Each one is avoidable.

• Collecting before registering. It's illegal in most states to collect sales tax without a permit. Register first, then collect.
• Assuming "small" means exempt. A $30,000-a-year store can still trigger nexus through physical presence.
• Ignoring product taxability. Clothing is exempt in some states, food in others, digital goods are taxed in a few. Your catalog matters.
• Forgetting exemption certificates. Wholesale buyers need to give you a resale certificate. Keep them on file.
• Skipping the business basics. Registration requires a valid entity setup. If you haven't sorted that, start with our guide on whether you need a business license to sell online.

Do dropshippers have nexus?

Yes, if they cross a threshold. Dropshippers selling under their own brand are the seller of record, so they owe sales tax collection like anyone else. The supplier may also have nexus, and resale certificates can get complicated. If you're building that model, our walkthrough on how to start a dropshipping boutique covers the setup side.

Does nexus apply to digital products?

Often, yes. Several states tax digital goods and SaaS-style downloads, and economic nexus applies to them too. If that's your model, see how to create a website to sell digital products, then check each state's rules for digital taxability.

Conclusion: Build Compliance Into Your Store Early

Economic nexus isn't a reason to avoid selling across state lines. It's a threshold to track. Know your numbers by state, register at around 80% of any limit, and keep records clean. The sellers who get hurt are the ones who find out after the fact.

Your platform should make this easier, not add another subscription. Rovela stores come with Stripe checkout, analytics, and an admin dashboard built in, so you can see sales by region without installing an app stack. Pair that with a CPA or tax tool for rates and filings, and you've covered the basics. You can see how it works at Rovela or check the pricing page to compare against what you pay now.