Do Non-US Sellers Need to Collect US Sales Tax? The 2026 Definitive Guide

If you sell into the United States from South Africa, the UK, the EU, India or anywhere outside the U.S., this is the question you have to answer before you do anything else.

The Short Answer

Yes — in most cases, non-US sellers must collect and remit US sales tax to one or more state Departments of Revenue. Living outside the United States, having no US permanent establishment and never setting foot in the country does not exempt you. Sales tax is not an income tax — there is no tax treaty that covers it.

The only meaningful exceptions are:

• You exclusively sell through certified marketplace facilitators (Amazon, Walmart, Etsy, eBay, TikTok Shop) AND you have no physical inventory in any US state, AND
• Your direct sales (Shopify, your own website, B2B invoicing) into any state stay below that state’s economic nexus threshold, AND
• You have no US-resident employees, contractors, agents or affiliates.

Almost no FBA seller, and most growing Shopify sellers, can answer ‘yes’ to all three. So the practical answer for most cross-border sellers is: yes, you owe US sales tax somewhere. The only question is which states, how much, and what you have to do about it.

Why This Changed in 2018: South Dakota v. Wayfair

Until June 21, 2018, the rule from Quill Corp. v. North Dakota (1992) protected remote sellers — including foreign sellers — from collecting sales tax in states where they had no physical presence. If you didn’t own property, employ staff or maintain inventory in a state, you didn’t have to register or collect that state’s sales tax.

The Supreme Court’s decision in South Dakota v. Wayfair, Inc. overturned Quill. States are now free to require sales tax collection from any seller — domestic or foreign — that meets that state’s economic nexus thresholds, regardless of physical presence.

By 2026, every U.S. state with a sales tax (45 states + the District of Columbia) has implemented economic nexus laws. Thresholds vary from $100,000 in most states to $500,000 in California, Texas and New York. None of these laws distinguish between U.S. and foreign sellers — if you cross the threshold, the obligation is the same.

But Doesn’t My Country Have a Tax Treaty With the US?

This is the most common point of confusion for foreign sellers. U.S. income tax treaties do NOT cover sales tax.

Tax treaties between the U.S. and South Africa, the UK, EU member states, India and most other countries deal with income tax — they prevent double taxation of profits, dividends, interest and royalties. They establish thresholds for permanent establishment, withholding rates, and dispute resolution.

Sales tax is a completely different animal. It is a state-level transaction tax imposed on the buyer at the point of sale and collected by the seller as an agent of the state. It has nothing to do with your business profits and is not affected by income tax treaties.

The practical implication: even if your country’s tax treaty fully exempts your business profits from U.S. federal income tax (because you have no permanent establishment), you can still owe sales tax in 10, 20 or 40 U.S. states based on where you ship and how much you sell.

How Marketplace Facilitator Laws Affect Foreign Sellers

Since 2019–2021, almost every state with a sales tax has passed a marketplace facilitator law that shifts the collection obligation from individual sellers to the marketplace platform itself.

For a foreign seller, this means:

• If you sell exclusively through Amazon, Walmart, Etsy, eBay or TikTok Shop, the marketplace collects and remits US sales tax on your behalf in nearly every state. You may not need to register at all.
• If you sell through your own Shopify, WooCommerce or BigCommerce store (where you control the checkout), you are the seller of record and the obligation is yours alone.
• If you sell on multiple channels (very common — most successful FBA sellers also have a Shopify store), you have a hybrid obligation: marketplace sales handled by the platform, direct sales handled by you.

Critically, in some states (Texas, Ohio, Nevada, New Jersey and others) marketplace sales still count toward the economic nexus threshold for direct-sale purposes. Cross-checking is essential — use the state-by-state guides linked at the end of this article.

👉 Not sure which states you owe in? Book a Free Nexus Consultation and we will run a multi-state nexus analysis on your Amazon, Shopify and Walmart data.

Physical Nexus: The FBA Inventory Trap

Even if your direct sales never approach a state’s economic nexus threshold, storing inventory in a U.S. fulfillment center automatically creates physical nexus in that state. There is no revenue safe harbor for physical nexus.

Amazon FBA fulfillment centers are spread across most major U.S. states. When Amazon distributes your inventory to optimise fulfillment speed, you typically end up with stock in 15–25 states without realising it. Each of those states becomes a state where you owe sales tax registration and filing.

The biggest concentrations of FBA centers are in:

• California (Sacramento, Stockton, Tracy, Riverside, San Bernardino, Eastvale)
• Texas (Houston, Dallas, Fort Worth, Austin, San Antonio, El Paso)
• Pennsylvania (Carlisle, Hazleton, Scranton, Pittsburgh, Allentown, Lewisberry)
• New Jersey (Edison, Robbinsville, Carteret, Avenel, Florence, Swedesboro, Cranbury)
• Ohio (Etna, Twinsburg, Obetz, Whitehall, Monroe, West Jefferson, Wilmington, Stow)
• Illinois (Joliet, Romeoville, Edwardsville, Monee, Aurora, Channahon)
• Florida (Lakeland, Orlando, Tampa, Jacksonville, Miami)
• Georgia (Atlanta, Macon, Jefferson, Stone Mountain, Union City, East Point)

If you use FBA at all, assume you have inventory — and therefore physical nexus — in at least 8–10 of these states.

What Happens If You Ignore This?

State Departments of Revenue have access to:

• Amazon FBA inventory reports — most states now subpoena Amazon directly
• Shopify, BigCommerce and Walmart sales data — same subpoena route
• IRS Form 1099-K reports — issued by every payment processor and marketplace
• Each other’s audit findings — through the Multistate Tax Commission and the Streamlined Sales Tax Governing Board

The realistic enforcement timeline for a non-compliant cross-border seller looks like this:

1. Year 1–2: You operate without registering. Sales tax is collected by Amazon for marketplace sales but not for your Shopify direct sales.
2. Year 2–3: A state DOR (typically California, Texas, New York or Washington) identifies your inventory in their state via Amazon’s data and assigns a delinquent registration date.
3. Year 3–4: You receive a letter assessing back taxes, penalties (typically 10–25% of tax) and interest (typically 5–10% per year).
4. If unpaid: The state can ask Amazon, Walmart or Shopify to suspend your account in that state. Amazon will comply. Your inventory becomes inaccessible.

For a $5M-revenue cross-border FBA seller, the typical back-tax exposure across 15 states is $150,000–$300,000 in tax + $40,000–$80,000 in penalties + interest. Voluntary disclosure agreements (VDAs) can typically reduce penalties to zero and limit lookback to 3–4 years — but only if you come forward before the state contacts you.

OK, So What Do I Actually Have to Do?

If you sell into the U.S. as a non-U.S. business, the practical steps are:

1. Get a U.S. EIN (Employer Identification Number) for your business. Foreign entities apply by phone (call IRS at 267-941-1099, M–F 6am–11pm Eastern) or by faxing Form SS-4 to 304-707-9471. Online applications require a U.S. SSN/ITIN, which most foreign founders don’t have.
2. Determine your nexus footprint. Pull your sales-by-state data from Amazon, Shopify, Walmart and any other channel. Identify states where you exceed the economic threshold OR where Amazon stores your inventory.
3. Register for sales tax in each of those states. Most states accept foreign business addresses on their registration forms — you do NOT need a U.S. address for sales tax registration. (You may need one for forming a U.S. LLC, but that’s a separate question.)
4. Set up U.S. ACH-capable banking. Most states require electronic payment. Wise Business, Mercury, Relay and Brex offer U.S. accounts to foreign founders.
5. File returns and remit tax on the cadence assigned by each state — typically monthly or quarterly. Late filing penalties start at $50 (Texas) or 10% of tax due (most other states).
6. Reconcile marketplace and direct sales on every return. Even when Amazon collects, you typically need to report total sales activity and back out the marketplace-collected portion.

👉 Or skip all of this and let Sales Tax Compliance USA do it for you. We handle EIN setup, multi-state registration, ongoing filings and remittance — one fee, no software for you to learn. Book a Free Consultation.

Why Sales Tax Compliance USA Exists

Big sales tax software platforms sell you a tool. They give you the software and say: ‘Here, you do it.’ For a U.S. company with a tax department and an in-house accountant, that works. For a cross-border seller in Cape Town, London, Mumbai or Berlin trying to register in 20 U.S. states without a U.S. address, an EIN or a U.S. bank account, it doesn’t.

That’s the gap we fill. Sales Tax Compliance USA delivers the entire service ourselves — done-for-you, one fee, no software for you to learn. We:

• Obtain your U.S. EIN as a foreign entity
• Run a multi-state nexus analysis on your Amazon, Shopify and Walmart data
• Register you in every state where you owe
• File returns and remit tax monthly, quarterly or annually as assigned
• Reconcile marketplace-collected vs direct-collected sales
• Defend you in the event of a state audit
• Handle voluntary disclosure agreements if you have historical exposure

You stay focused on growing your business. We handle every piece of U.S. sales tax compliance.

Frequently Asked Questions

The Bottom Line

If you sell into the United States from outside the U.S., you almost certainly have U.S. sales tax obligations in multiple states. Income tax treaties don’t help. The marketplace facilitator laws help with marketplace sales but don’t eliminate registration obligations where you have physical nexus. And the enforcement tools states have — particularly the ability to freeze your Amazon, Walmart or Shopify account — make ignoring this expensive and operationally painful.

The good news: it doesn’t have to be stressful. Sales Tax Compliance USA handles the entire compliance lifecycle for cross-border sellers — EIN setup, multi-state registration, ongoing filings and remittance — in one fixed fee. No software for you to learn, no jargon, no surprise bills.

👉 Book a Free Consultation with our U.S. tax specialists today.

Want to dig into specific states? Browse our U.S. Sales Tax Compliance Hub for state-by-state guides.