State Sales Tax Nexus for Foreign-Owned LLCs

For a foreign-owned LLC selling to U.S. customers, the instinct is to ask whether being foreign-owned changes the sales-tax answer. It usually does not. State sales tax is a transaction tax on the buyer, collected by the seller as a trustee; the seller's citizenship or country of formation is largely beside the point. What matters is whether the seller has nexus in a state, whether the sale flowed through a marketplace that already collects, and whether the item sold is taxable there.

That reframing is freeing and dangerous at once. Freeing, because a non-resident owner is not subject to some separate, harsher sales-tax regime. Dangerous, because the comfortable assumption that a foreign seller with no U.S. office is automatically exempt is wrong after Wayfair. A seller in another country with no employees, inventory, or property in a state can still be required to register and collect there once an economic threshold is crossed.

A workable mental model is four gates, applied in order: channel (is a marketplace collecting?), nexus (have I crossed a threshold or do I have physical presence?), product taxability (is this SKU taxable in that state?), and registration mechanics (how do I actually register and file?). The rest of this report walks each gate.

Before 2018, a state generally could not force a seller to collect sales tax unless the seller had a physical presence there — the rule from the 1992 case Quill. In South Dakota v. Wayfair, Inc. (2018), the Supreme Court overruled that physical-presence requirement and upheld a South Dakota law that imposed a collection duty on remote sellers based purely on economic activity in the state.

The South Dakota statute the Court blessed used two safe-harbor thresholds — more than $100,000 of sales into the state or 200 or more separate transactions in a year — and most states then adopted similar remote-seller laws. The result is that a seller with no U.S. footprint can now have a collection obligation in dozens of states based only on where its customers are.

Two practical points follow. First, economic nexus is measured state by state, on each state's own threshold, measurement window, and definition of what counts (gross sales, retail sales, or taxable sales). Second, crossing a threshold creates a prospective duty to register and collect — it is a compliance trigger, not a one-time penalty — so the date you cross matters for when collection must begin.

The most common pattern across the sales-tax states is a revenue threshold centered on $100,000, sometimes paired with a 200-transaction alternative. But the variations are real and consequential. Some larger states set a much higher dollar threshold (for example, several use $500,000), and some set it higher still or measure only taxable sales rather than gross sales.

The most important moving target is the transaction-count test. A clear 2024-2026 trend is states removing the 200-transaction threshold entirely and keeping only the dollar threshold — which actually *reduces* the number of small-volume sellers caught, because hitting 200 low-value orders no longer triggers nexus on its own. States that have dropped the transaction test in recent years include examples such as Indiana, North Carolina, Wyoming, Utah, and Illinois, each on its own effective date.

Because these rules change every legislative session, treat any specific threshold you see — including the ones in this report — as a starting point to verify, not a settled fact. The reliable workflow is to pull the current economic-nexus page from the specific state's department of revenue (or a maintained nexus chart) at the moment you need to decide, and to re-check it periodically as your sales grow.

Marketplace-facilitator laws shift the collection duty from the individual seller to the platform when the platform meets the state's definition of a facilitator. These laws are now close to universal across the statewide sales-tax states, and in practice the big general marketplaces — Amazon, Etsy, and eBay — generally calculate, collect, and remit the sales tax on orders shipped to U.S. buyers where a facilitator law applies, on behalf of the seller, regardless of whether the seller is inside or outside the United States.

Shopify is the common trap. A merchant's own Shopify storefront is generally not a marketplace-facilitator arrangement — Shopify provides the checkout, but the merchant remains the seller of record and is responsible for registering, collecting, filing, and remitting on direct-store sales. The exception Shopify itself describes is its Shop sales channel, which the company says has automatically collected, remitted, and filed tax on U.S. marketplace orders since January 1, 2025. So 'I use Shopify' does not answer the question — it depends on whether the sale ran through the Shop channel or your own store.

Two nuances catch sellers off guard. First, marketplace-collected sales may still count toward your economic-nexus threshold in some states, and some states may still expect the seller to file a return (sometimes a zero return) even where the marketplace remitted the tax. Second, the scope of what marketplaces collect on is widening as states expand taxability — for example, to certain digital products and, in a few states, services — so the platform's collection follows each state's taxability rules.

Wayfair did not abolish physical-presence nexus — it added economic nexus on top of it. A foreign-owned LLC can therefore trip nexus two different ways, and should screen for both.

Physical nexus still arises from a tangible connection to a state: inventory stored there, employees or contractors working there, an office or leased space, or in some states owned property. For e-commerce sellers, the most common surprise is inventory in a fulfillment warehouse — storing goods in a state's fulfillment center can create physical nexus there even if the seller never set foot in the country. Marketplace programs that move and store your inventory across multiple states make this a multi-state question by default.

Economic nexus arises purely from sales volume into the state, as described above, with no physical connection required. In practice a foreign seller should run both screens: map where any inventory, people, or property sit (physical), and separately track sales by destination state against each state's threshold (economic). Either one, on its own, can create a duty to register and collect.

If you sell tangible goods, taxability is comparatively standardized. If you sell software-as-a-service, downloadable software, digital content, or subscriptions, it is not. Digital-product and SaaS taxation is one of the most fragmented areas of U.S. sales tax, and the same product can be taxable in one state and exempt next door.

A useful pattern from the state-by-state guidance is that digital goods tend to be taxed more broadly than SaaS, and that SaaS treatment often depends on how the state classifies hosted software: as taxable prewritten software, a taxable digital product, a taxable data-processing or IT service, or a non-taxable service. Several states draw a business-use vs personal-use distinction or apply a special rate to certain software or IT services rather than a clean taxable/exempt line, which is why a one-word answer is usually only partial.

Recent changes show how fast this moves: some states have newly extended sales tax to additional digital or IT services (for example, expansions taking effect in 2025 in states such as Maryland and Washington), while many large-population states still generally exempt ordinary SaaS. The operational takeaway for a digital business is to classify each SKU or service line precisely — tangible good, downloadable digital product, subscription, SaaS, data-processing/IT service, custom-software engagement, or professional service — because that classification, applied per state, drives everything downstream.

The sequence matters: you generally register before you collect, and you collect only after you are registered and the obligation has begun. Registering for a sales-tax permit in a state where you have nexus is the step that authorizes you to collect tax from buyers; collecting tax without a permit, or failing to collect once you have nexus, are both problems.

The trigger to register is nexus — physical or economic. Once you cross a state's economic threshold (or establish physical presence, such as inventory in the state), you should register for that state's sales-tax account, begin collecting on taxable sales to that state, and file on the assigned frequency. The exact date collection must begin after a threshold is crossed differs by state, which is why tracking the crossing date is part of the workflow.

Keep two different filings straight. A sales-tax registration is a tax account with the state's revenue department. Foreign qualification with the secretary of state is a separate business-law filing driven by whether the entity is 'doing business' in the state under that state's corporate law. They are related but distinct: merely crossing an economic-nexus threshold for sales tax does not automatically answer the corporate-law question, though physical presence (inventory, employees, leased space) tends to make foreign qualification more likely.

For the subset of states that are Streamlined Sales Tax (SST) member states, the Streamlined Sales Tax Registration System (SSTRS) lets a seller register in several member states through a single application rather than filing separately with each. SST also coordinates certified service providers who can handle registration, taxability mapping, rate calculation, filing, and remittance in participating states.

SST is notably accommodating to foreign sellers. Its guidance allows a foreign company with no U.S. address and no FEIN or SSN to register by selecting 'Other' as the identification type, after which an identifier is assigned for registration purposes. The application generally asks for entity type, legal name, identification number, NAICS code, state of organization, business and mailing addresses, contact details, a start date, and any states where you are already registered — and member states typically send registration information back within roughly two weeks, with some asking for additional officer or organizational details.

Two limits are worth stating plainly. SST covers only its member states — it is not a single national registration — so non-member states still require direct registration through their own revenue portals. And SST registration is prospective: absent a specific amnesty program, registering through SSTRS does not erase historical liability in states where you should already have been registered. For past exposure, the tool is a voluntary disclosure agreement (next section), not SST.

Penalties for non-registration, late filing, and late payment escalate quickly. A common civil-penalty pattern is a percentage of the tax due — frequently in the 5% to 25% range — plus interest, with harsher treatment for willful failure, fraud, or evasion, and the possibility of criminal exposure in egregious cases. Because the seller is collecting tax in trust for the state, an audit can also reach uncollected tax the seller should have charged, which can dwarf the penalty itself when nexus went unaddressed for years.

The structured way to fix past exposure is a Voluntary Disclosure Agreement (VDA). Most states offer a program under which a seller that comes forward before being contacted by the state can typically get a limited look-back period (often around three to four years instead of the full open period) and a waiver or reduction of penalties, usually in exchange for registering, filing for the look-back, and paying the back tax plus interest. The catch is timing: the program generally requires that the state has not already contacted you, so the window closes once an audit notice arrives.

For a foreign-owned LLC that discovers it crossed thresholds in prior years, the practical decision is usually between registering prospectively and quietly catching up versus a formal VDA that caps the look-back and waives penalties. Which is better depends on how large and how old the exposure is, and on whether marketplace facilitators were already remitting most of the tax — so quantify the gap by state before choosing.

Multi-state sales tax is hard to do by hand once you sell taxable products into several states, and a category of automation software exists for exactly this. Tools such as Avalara and TaxJar, among others, integrate with common storefronts and marketplaces to calculate rates at checkout, track economic-nexus thresholds across states, classify product taxability, and prepare or file returns. SST's certified-service-provider program is a related, state-sanctioned version of the same idea for member states.

These tools genuinely reduce the operational burden — real-time rate calculation and automated nexus tracking remove two of the most error-prone manual steps. But they do not change the legal questions: whether you have nexus, how your specific products are classified, and whether to address past exposure through a VDA are judgment calls the software supports rather than settles. Configuration errors (a misclassified SKU, a missed inventory state) also flow straight through to filed returns.

The durable posture for a foreign-owned LLC is therefore: separate sales by channel, classify each product precisely, monitor nexus by state on current thresholds, register before collecting (using SSTRS where it helps), keep a per-state audit file (marketplace remittance evidence, exemption certificates, return workpapers), and re-verify the rules — because the thresholds and taxability lines in this area genuinely change every year.