Out-of-state sales tax is not controlled by one national threshold. A seller has to check the rules of each state where it has a physical connection, ships taxable products, delivers taxable services, stores inventory, or makes enough sales to trigger that state’s economic-nexus rule.
The Safe Short Answer
Start with three separate questions:
- Do I have physical nexus? Property, inventory, people, offices, equipment, or in-state activity can create an obligation before sales reach an economic threshold.
- Do I have economic nexus? A state may require a remote seller to register, collect, and file after state-directed sales cross that state’s rule.
- Who made the sale? A registered marketplace facilitator may collect tax on a facilitated transaction, but that does not automatically answer the seller’s obligations for direct sales, stored inventory, other channels, or every filing rule.
This page is general operational information, not tax or legal advice. Rules change, facts matter, and a state revenue department or qualified adviser should resolve an actual filing decision.
Source check: The state examples and links on this page were reviewed against current official guidance on August 23, 2026.
Why the Old Physical-Presence Shortcut No Longer Works
For years, small online sellers often reduced the question to, “Do I have a store or employee in that state?” That is no longer a complete test.
In South Dakota v. Wayfair, the U.S. Supreme Court rejected the rule that physical presence was required before a state could impose a sales-tax collection duty on an out-of-state seller. States then adopted or enforced their own economic-nexus rules.
That did not erase physical nexus. It added another route to an obligation. A seller can be below an economic threshold and still have a problem because inventory sits in a fulfillment center, an employee or representative works in the state, equipment is located there, or temporary selling activity creates a connection under that state’s law.
Four Terms That Need Separate Boxes
| Term | Practical meaning | Question to answer |
|---|---|---|
| Physical nexus | A sufficient in-state connection through property, people, inventory, facilities, equipment, or activity. | What do we own, store, operate, or do in the state? |
| Economic nexus | A state sales level that can create duties without physical presence. | Which sales count, what period applies, and is the rule “meets” or “exceeds” the amount? |
| Marketplace facilitator | A qualifying platform that may be treated as the retailer and collect tax on facilitated sales. | Did the platform collect for this transaction, and what documentation proves it? |
| Destination or sourcing rule | The rule used to decide which state and local jurisdiction receives the sale. | Which location controls: origin, delivery address, customer location, or another state-defined place? |
These boxes interact, but they are not interchangeable. A marketplace collecting tax does not prove that the seller has no registration duty. Crossing a revenue threshold does not prove every sale is taxable. A nontaxable sale may still count toward a state’s threshold. A delivery address may determine one part of the rate while a home-rule locality administers another part separately.
There Is No Safe Universal Threshold
“The threshold is $100,000” is a tempting sentence because it fits neatly in a spreadsheet cell. It is also unsafe as a national rule.
States differ on the dollar amount, which sales count, whether marketplace sales are included, whether the trigger is met or exceeded, the measurement period, the date collection begins, and what happens after sales fall below the line. Transaction-count rules have also changed in several states. A copied 50-state chart can age faster than the yogurt hiding behind the mustard.
| Current official example | What the official guidance says | Why it is only an example |
|---|---|---|
| California | California’s current Wayfair guidance describes an economic-nexus threshold based on combined sales of tangible personal property for delivery in California exceeding $500,000 in the preceding or current calendar year. | California’s amount, included sales, physical-presence rules, district taxes, and marketplace rules are California-specific. |
| Colorado | Colorado’s May 2026 Sales Tax Guide describes an exemption for a retailer with no Colorado physical location when annual Colorado retail sales are less than $100,000 in both the current and previous calendar years, and explains when collection begins after sales exceed $100,000. | Colorado also has state-administered local taxes and separate home-rule cities. Its timing and sales-counting rules should not be copied to another state. |
Use a current multi-state table as a lead generator, not as the final authority. The final check belongs on the state revenue department’s site, with the effective date and source URL recorded.
Marketplace Collection Is Transaction-Specific
Amazon, Etsy, eBay, Walmart Marketplace, and similar platforms may collect and remit sales tax as marketplace facilitators. That can remove the seller’s collection duty for a facilitated sale. It does not make the broader review disappear.
- Separate marketplace sales from sales through your own website, invoices, social channels, events, or an unregistered platform.
- Confirm that the platform is acting as a registered marketplace facilitator for the state and transaction.
- Keep reports or agreements showing what the facilitator collected and remitted.
- Check whether marketplace sales count toward the state’s economic-nexus calculation even when the facilitator collects the tax.
- Check for physical nexus created by inventory stored in a marketplace or third-party fulfillment center.
- Do not assume a marketplace-only exemption in one state exists in the same form elsewhere.
California, for example, says a marketplace seller whose California sales are all qualifying marketplace sales generally is not required to register for a seller’s permit or use-tax account. The same official guidance says direct sales can create a registration requirement, marketplace sales may count toward the $500,000 threshold, and inventory in California can create physical presence. Colorado says a retailer selling only through a marketplace may be exempt from state sales-tax licensing, collection, and filing if the facilitator collects all applicable state and state-administered local taxes. Those are useful examples precisely because the details are not identical.
A Practical State-by-State Workflow
1. Map the physical footprint
List offices, homes used for business, employees, contractors or representatives, inventory, warehouses, fulfillment centers, equipment, trade shows, markets, installation work, and delivery activity by state. Do this before opening a threshold table.
2. Separate every sales channel
Track direct website sales, marketplace sales, invoices, wholesale sales, in-person events, and other channels separately. Keep the destination state, gross amount, product or service category, exemption information, returns, and facilitator-collected tax.
3. Classify what was sold
Tangible goods, digital products, software, subscriptions, and services can receive different treatment. “Online sale” is a delivery method, not a taxability category. The state has to answer whether the specific product, service, or bundle is taxable.
4. Check the official threshold definition
Record the amount, whether the state says “meets” or “exceeds,” the lookback period, which sales count, whether marketplace sales count, whether exempt or wholesale sales count, and the date registration or collection must begin.
5. Check registration separately from collection
Registration, collection, filing, and payment are related but separate duties. A marketplace may collect on its transactions while the seller still has a direct-sales obligation. A zero-tax or marketplace-deduction return may still be required after an account is open. Never collect a tax merely because a dashboard offers a switch; confirm the registration and collection rules first.
6. Confirm sourcing and local rules
Remote sales are often tied to the delivery destination, but the exact state and local sourcing rule must be checked. Colorado’s guidance is a good warning label: the state administers many local taxes, while certain home-rule cities administer their own. A correct state rate can still be an incomplete answer.
7. Save the evidence
For each state reviewed, save the official URL, page title, effective or revision date, date checked, relevant threshold language, marketplace treatment, sourcing rule, registration decision, and who made the decision. Use the same discipline described in Run and the ABC-eFlow Method: establish a baseline, identify the constraint, record the evidence, and review the decision when facts or rules change.
What a Small Seller Should Track
| Field | Why it matters |
|---|---|
| Order date and destination | Supports the state and measurement-period review. |
| Gross sale, discounts, returns, and shipping | States define threshold calculations differently. |
| Product or service category | Taxability is not the same for every item. |
| Marketplace or direct channel | Identifies who may be responsible for collection. |
| Tax collected by facilitator | Supports deductions, reporting, and audit records. |
| Exemption or resale documentation | Explains why a sale was not taxed. |
| Inventory and fulfillment location | Can reveal physical nexus. |
| Official source and date checked | Makes the decision reviewable when rules change. |
A spreadsheet, accounting system, sales-tax service, or ecommerce report can help organize this. The Tools page explains the larger rule: the tool supports the workflow; it does not replace the decision.
Primary Sources Used for This Refresh
- U.S. Supreme Court: South Dakota v. Wayfair, Inc.
- California Department of Tax and Fee Administration: Use Tax Collection Requirements Based on Sales into California
- California CDTFA: Online Retailers — Registration and Local Tax
- Colorado Department of Revenue: Sales Tax Guide, revised May 2026
- Colorado Department of Revenue: Sales Tax Information for Online Sellers
For a current cross-state starting point, the Streamlined Sales Tax Governing Board’s Remote Seller State Guidance links to state-specific threshold and marketplace materials. Use it to find the correct state page, then verify the decision with that state’s authority.
Bottom Line
Do not ask only, “Did I cross $100,000?” Ask where the business has physical connections, where customers receive the sale, which sales count under that state’s current rule, whether a facilitator collected on the transaction, whether direct sales remain, and what registration or filing duty follows.
The safe system is state-specific, source-dated, channel-aware, and reviewable. If the answer affects a real filing or a material amount of money, confirm it with the state or a qualified tax professional.
Last reviewed: August 23, 2026 — Q5 primary-source refresh