Sales Tax Nexus for Non-Resident LLC E-Commerce Sellers (2026): Economic Nexus Explained

Selling on Shopify or Amazon from outside the US does not exempt your LLC from state sales tax. Since South Dakota v. Wayfair, Inc. (2018), states can require tax collection based on sales volume alone, no US office, warehouse, or citizenship required. Here is what actually triggers that obligation in 2026, and what does not.

What Is Economic Nexus, and Why Did It Replace the Physical-Presence Rule?

Economic nexus lets a state tax remote sellers based on sales volume, no physical footprint needed, a rule the Supreme Court created in 2018. Before that, a 1992 case set the older standard non-residents may have heard about.

That older case, Quill Corp v. North Dakota (1992), said a state could only force a business to collect its sales tax if the business had a physical presence there: a store, warehouse, or employees. Wayfair overturned that rule entirely. Most guides still frame Wayfair around the "$100,000 or 200 transactions" figure, but that number was simply how the Court described South Dakota's own law in the opinion, not a national standard every state copied and kept.

For a non-resident LLC owner, the practical effect is this: your lack of a US address, passport, or office no longer shields you from a state's tax collection rules. If your sales into that state cross its threshold, you have nexus there, full stop.

Physical Nexus vs Economic Nexus: The Difference That Trips Up FBA Sellers

Physical nexus triggers tax obligations immediately, regardless of sales volume, the moment your business has an office, employees, or inventory in a state. Economic nexus is volume-based and sits alongside it, not instead of it. Many non-resident sellers only think about the second one and miss the first.

Why Amazon FBA Inventory Creates Nexus You Didn't Choose

Amazon redistributes FBA inventory across its fulfillment network on its own schedule, not yours. Non-resident sellers who never set foot in the US have discovered, only when a state notice arrived, that their stock had been sitting in a warehouse there for months.

What Are the Real 2026 State Sales Tax Thresholds?

Most major e-commerce states have simplified to a single dollar threshold, dropping the transaction-count test entirely by 2026. Illinois dropped its 200-transaction test on January 1, 2026, and Kentucky follows on August 1, 2026, joining Alaska (January 2025) and Utah (July 2025).

The widely repeated "$100,000 or 200 transactions" rule of thumb is a snapshot of the Wayfair-era default, not a live universal rule. By 2026 the specific threshold, and whether a transaction count applies at all, varies state by state, as the table below shows for four representative states.

Does Amazon Collecting Tax Mean I'm Already Covered?

Not for your own website. Marketplace facilitator laws require Amazon, Etsy, eBay, and Walmart Marketplace to collect and remit sales tax on transactions made through their platforms, in every US sales-tax state. That protection stops at the marketplace's edge.

Marketplace Sales vs Your Own Shopify or Direct Site

This split is the single most common point of confusion for Shopify and Amazon sellers. Sellers routinely assume that because Amazon "handles tax," their entire business is covered, then get blindsided when a state notice arrives for their direct-site sales alone.

Do Marketplace Sales Count Toward Your Own Threshold?

It depends on the state, so check each one directly. Texas, for example, counts marketplace-facilitated sales toward a seller's own $500,000 economic nexus threshold, even though Amazon is the one remitting the tax on those sales (Texas Comptroller). Other states handle this differently, which is why a seller running both Amazon and Shopify can hit a direct-site registration duty sooner than expected.

How Do I Register for a State Sales Tax Permit Without a US SSN?

You do not need an SSN or ITIN to register; your LLC's EIN generally works instead. A foreign owner applies for that EIN using Form SS-4, writing "Foreign" on line 7b, since the online IRS portal requires a US SSN or ITIN that non-residents usually do not have.

Getting an EIN as a Foreign-Owned LLC

Without an SSN, you apply for the EIN by phone, fax, or mail rather than online. This is the same EIN your LLC already needs for its Form 5472 federal filing, so most founders already have one by the time sales tax registration comes up.

Which States Accept an EIN in Place of an SSN

Many states accept the LLC's EIN on the state sales tax permit application instead of a personal SSN. Some, however, require a paper application rather than the online portal when the applicant has no SSN or ITIN on file. Confirm the specific process on each state's Department of Revenue site before you apply, since this detail has not been independently verified state by state.

What Happens If You Ignore Sales Tax Nexus Obligations

A business that should have collected sales tax but did not is typically held liable for that tax out of its own pocket, plus penalties and interest that vary significantly by state. States can assess these amounts retroactively once they identify a seller with unreported nexus.

Personal Liability for LLC Members

Your LLC's liability shield does not always extend to unpaid sales tax. California law holds responsible LLC members and managers personally liable for willfully unpaid sales tax under Cal. Rev. & Tax Code §6829, and similar personal-liability rules exist in most other states. Ignoring nexus is rarely a business-only risk; it can follow you personally.

Staying ahead of this is simpler than untangling it after the fact. Track your sales by state, know your LLC's compliance obligations as a non-resident, and register before a threshold is crossed rather than after a state notice shows up. Pairing this with your annual federal compliance calendar keeps sales tax from becoming a separate, surprise fire drill.

Sales Tax Nexus for Non-Resident Sellers — FAQ