Economic nexus means a state can require your business to register, collect, and remit sales tax even if you do not have a warehouse, office, or employees there. If your ecommerce business sells into a state and crosses that state’s economic threshold, you may have a filing obligation there whether you sell on Amazon, Shopify, Etsy, Walmart, or a mix of channels. The exact threshold, measurement period, and whether marketplace sales count can vary by state, so the safest approach is to check each state where you sell before you assume you are below the line.
If you are already crossing sales tax thresholds in one or more states, the next step is usually registration, followed by collecting tax on taxable sales, filing returns on the state’s schedule, and remitting what you collected on time. Marketplace sales sometimes count toward your threshold and sometimes do not, depending on the state and the rule that applies. If you are unsure whether you have nexus, or whether you should register now, the exact position depends on your circumstances — confirm with the state, or talk to us and we will check it for you.
Key takeaways
- Economic nexus is based on sales activity, not just physical presence.
- Thresholds vary by state, and marketplace sales may or may not count.
- Physical presence can still create nexus even below an economic threshold.
- After crossing a threshold, register first, then collect, file, and remit on schedule.
- Missed deadlines can create penalties and ongoing compliance issues.
What economic nexus means for online sellers
Economic nexus is a sales tax connection based on the level of sales you make into a state, not on whether you physically operate there. For ecommerce and cross-border sellers, that means a state can require compliance once your sales activity crosses its threshold, even if your only presence is a laptop and fulfillment handled elsewhere.
This matters because many sellers assume sales tax starts only when they open a warehouse or hire staff in a state. Physical presence can absolutely create nexus, but it is no longer the only way a state can reach you. In practice, economic nexus is the rule most online sellers run into first, especially when they sell across several channels and do not track state-by-state totals closely.
The most common threshold pattern is a dollar-based sales test, sometimes paired with a transaction-count test. Some states use one test, some use both, and some use a higher sales threshold. Because the rule is state-specific, the right question is not “Do I have nexus somewhere?” but “In which states have my sales, transactions, or other activities crossed the current rule?”
Economic nexus thresholds by state
There is no single nationwide threshold. States set their own economic nexus rules, and the comparison usually comes down to three things: the sales amount, whether transactions matter, and what type of sales are included in the calculation. For example, some states use a sales-only threshold, while others require both sales and a minimum number of transactions. A few states use higher dollar thresholds.
For sellers with a broad footprint, the practical issue is that you can be below the line in one state and above it in another at the same time. That is why many compliance reviews focus on the last 12 months by destination state, then separate direct sales from marketplace-facilitated sales before determining next steps.
Sales Tax Compliance USA commonly helps sellers sort through this state-by-state picture, including states such as Arizona, Arkansas, California, Colorado, Connecticut, and the District of Columbia, where the rules can differ in the way the threshold is measured and what triggers registration. If you are close to a threshold, the exact position depends on your circumstances — confirm with the state, or talk to us and we will check it for you.
States with dollar-based thresholds versus transaction-count thresholds
Most states use a dollar-based economic nexus threshold, and many of those also have a transaction-count rule or have had one in the past. The dollar test is generally the main trigger for ecommerce sellers, because it captures the overall volume of taxable or gross sales into the state. Transaction-count rules matter more for low-dollar, high-order-volume businesses, such as sellers with lots of inexpensive items.
Some states use only a sales threshold and no separate transaction trigger. Others still use both. Because the legal details vary, you should not assume that a low average order value protects you everywhere. A business can have only modest revenue in a state and still cross a transaction-based threshold if it processes enough separate orders.
Marketplace sales can complicate this further. In some states, marketplace-facilitated sales count toward the seller’s threshold; in others they do not. That means two sellers with the same customer total can have different nexus outcomes depending on how much of that activity is direct versus marketplace-based, and which state rules apply.
States with no statewide sales tax
At the state level, five states do not impose a general statewide sales tax: Alaska, Delaware, Montana, New Hampshire, and Oregon. That does not mean there is no compliance question at all. Local taxes, gross receipts-style rules, or special obligations can still matter depending on the activity and jurisdiction.
For ecommerce sellers, the absence of a statewide sales tax in those states can reduce the chance of a state sales tax filing obligation, but it does not erase the need to look at your full footprint. If you have physical property, employees, inventory, or other taxable presence in a state, a separate nexus issue may exist outside of the sales tax question.
Also, sellers often forget that “no statewide sales tax” is not the same as “no tax exposure.” Shipment destination, inventory placement, and marketplace rules still need review. If you sell into one of these states, the exact position depends on your circumstances — confirm with the state, or talk to us and we will check it for you.
How marketplace facilitator rules affect nexus
Marketplace facilitator rules are one of the biggest reasons sellers get confused about nexus. In many states, the marketplace itself is responsible for collecting and remitting tax on marketplace-facilitated sales. But that does not automatically mean those sales are ignored for every nexus calculation. Some states count marketplace sales toward the seller’s threshold, while others exclude them when the marketplace is collecting tax.
For a seller who uses Amazon, Etsy, Walmart, or another marketplace alongside a direct store, the practical rule is to separate the channels. Direct sales usually count toward your own threshold analysis. Marketplace sales may or may not count, depending on the state. That distinction can change whether you need to register in the first place.
This is why a seller can have large marketplace volume but no direct-sales registration duty in one state, while in another state those same marketplace sales push the total over the line. If you rely heavily on marketplaces, you should review the rules before assuming you are covered everywhere.
Other activities that can create sales tax nexus
Economic nexus is only one way a state can create a sales tax obligation. Physical presence still matters. Inventory stored in a state, an office, a warehouse, employees, contractors who create a sufficient presence, or other in-state business activity can all create nexus even if sales volume is low.
That matters for sellers using fulfillment services or storing goods in third-party locations. A business may have no economic nexus in a state and still have a filing obligation because inventory is sitting there. In other words, sales volume does not always tell the full story.
Physical presence can also combine with economic nexus, meaning you may be required to register on more than one basis. If you have moved inventory between fulfillment locations, added staff, or expanded into new states, the safest answer is not to guess — it is to review the state activity against the current rules.
What to do after crossing a threshold
After you cross an economic nexus threshold, the usual next step is to register for that state’s sales tax account before you begin collecting tax there. Registration creates the legal ability to collect and remit, and it also starts the state’s compliance clock for filing returns and maintaining your account.
Once registered, you generally need to charge the correct sales tax on taxable sales shipped to that state, keep records by state and channel, and file returns on the schedule assigned by the state. The filing frequency may be monthly, quarterly, semiannual, or annual, depending on the state and your level of activity.
From a seller’s perspective, the mistake to avoid is waiting until tax season or year-end. Sales tax is usually a live compliance obligation, not a once-a-year cleanup project. If you have already crossed a threshold, it is usually better to address it immediately than to let unpaid periods pile up.
Sales tax filing, remittance, and deadlines
Registration is only the beginning. Once you are registered, you have an ongoing duty to file sales tax returns even in periods where you did not collect much tax, or in some cases no tax at all. The state may still expect a return that reports the activity for that period.
Deadlines matter because a missed filing or payment can trigger penalties, interest, or both. Even when the tax was collected correctly, missing the due date can create a separate compliance issue. States can also require repeated filings on a fixed schedule, so a single missed deadline can snowball into multiple late periods if it is not corrected quickly.
How often you file depends on the state and your assigned filing status. Businesses commonly file monthly, quarterly, or annually. If your sales grow, your filing frequency can change, which means compliance is ongoing and not static. That is one reason sellers often choose a done-for-you service instead of trying to monitor multiple deadlines themselves.
Common economic nexus patterns sellers should watch for
| Rule type | How it works | What it means for sellers |
|---|---|---|
| Dollar-based threshold | A state sets a sales amount that, once exceeded, creates nexus. | This is the most common trigger for ecommerce sellers. Track sales by destination state, not just total revenue. |
| Transaction-count threshold | A state counts a set number of sales transactions, sometimes alone and sometimes with a sales test. | Low-price, high-order businesses can hit nexus even when revenue looks modest. |
| Marketplace sales treatment | Some states count marketplace-facilitated sales toward the seller threshold and some do not. | Do not assume Amazon, Etsy, Walmart, or other marketplace sales are always excluded. |
| Physical presence | Inventory, employees, offices, or other in-state activity can create nexus. | You may have a filing duty even below an economic threshold. |
| No statewide sales tax state | A state may not impose a general statewide sales tax. | This does not end every tax question; local or other obligations may still apply. |
Frequently asked questions
What is economic nexus?
Economic nexus is a state sales tax obligation triggered by sales activity into a state rather than by physical presence alone. If your business exceeds that state’s threshold, you may need to register, collect, and remit sales tax there. The threshold and calculation method vary by state.
How do I know if my business has sales tax nexus?
Start by reviewing where you sell, where inventory is stored, whether you have staff or other physical activity in a state, and whether your sales or transaction totals cross that state’s current threshold. Separate direct sales from marketplace sales because they may be treated differently. If the result is unclear, the exact position depends on your circumstances — confirm with the state, or talk to us and we will check it for you.
Do sales made through marketplaces count toward economic nexus thresholds?
Sometimes yes and sometimes no. In some states, marketplace-facilitated sales are counted toward the seller’s threshold; in others, they are excluded when the marketplace is collecting and remitting tax. The state rule controls, so you need a state-by-state review.
What should I do after crossing an economic nexus threshold?
Register in the state, begin collecting tax on taxable sales once registration is in place, and prepare to file and remit returns on the state’s schedule. Keep records by state and channel so you can support the calculation. If you are already over the threshold, do not wait to act.
Do I need to register before collecting sales tax?
Yes, in general you should register before you start collecting in a state. Registration establishes your tax account and allows you to file properly. Collecting first and registering later can create avoidable compliance problems.
How often do businesses need to file sales tax returns?
It depends on the state and your assigned filing frequency. Common schedules are monthly, quarterly, or annual, and the state can change your frequency based on activity. Even if you had little or no tax collected, a return may still be required.
What happens if I miss a sales tax registration or filing deadline?
Late registration or late filing can lead to penalties, interest, and extra compliance cleanup work. In some cases, the state may also review prior periods more closely. If you missed a deadline, it is usually best to fix it quickly rather than wait.
Does physical presence create sales tax nexus?
Yes. Physical presence can create nexus even if your sales volume is low. Inventory, employees, offices, and other in-state activity can all be enough to create a filing obligation.
Official sources
- https://www.alaska.gov
- https://azdor.gov
- https://www.arkansas.gov/dfa
- https://www.cdtfa.ca.gov
- https://tax.colorado.gov
- https://portal.ct.gov/drs
Related reading
- Economic nexus in Arizona
- Economic nexus in Arkansas
- Economic nexus in California
- Economic nexus in Colorado
- Our sales tax compliance services
Getting this handled
If you would rather not work this out yourself, that is what we do. We register you, file your returns and keep you compliant across every state where you have an obligation — one point of contact, one invoice. Talk to us about your situation.
Reviewed by Paul le Roux, CA(SA). Sales Tax Compliance USA handles US sales tax registration, filing and remittance for cross-border and domestic ecommerce sellers as a fully managed service.
This article is general information for educational purposes and does not constitute legal or tax advice. Sales tax rules change and depend on your specific facts. Consult a qualified tax professional about your own position.