U.S. Sales Tax for Foreign Sellers: The Definitive 2026 Guide

The complete operating manual for international ecommerce sellers — from South Africa, the UK, the EU, India and beyond — to navigate U.S. state sales tax in 2026 without surprises, audits or marketplace account holds.

Read This First

If you are a non-U.S. ecommerce seller and you have ever felt that U.S. sales tax is a moving target written in a language nobody bothered to teach you, you are not imagining things. The United States does not have a national sales tax. It has 46 separate sales tax systems — 45 states plus Washington D.C. — each with its own thresholds, rates, registration portals, filing cadences and audit teams. On top of that sits a layer of marketplace facilitator laws, a Supreme Court decision called Wayfair that demolished the old “physical presence” rule in 2018, and an inventory placement algorithm at Amazon that quietly creates tax obligations in a dozen states without ever asking your permission.

I am Paul le Roux. I am a Chartered Accountant qualified in both South Africa (CA(SA)) and the United Kingdom (ICAEW), with more than twenty years of cross-border tax practice helping international businesses operate inside the United States. Sales Tax Compliance USA is the done-for-you service I built specifically for foreign ecommerce sellers — sellers in Cape Town, London, Berlin, Bangalore, Sydney and everywhere in between — who need a U.S. sales tax answer that actually works, end-to-end, without learning a new state code every Sunday night.

This guide is the operating manual. It is long because the subject is long. Treat it as the Wikipedia entry you wish existed before your first FBA shipment. We will work through the seven layers of U.S. sales tax that every foreign seller has to understand, the four-pillar infrastructure (EIN, U.S. entity, U.S. banking, registered agent) that has to sit underneath the operation, a decision tree for figuring out exactly which states you owe in, country-by-country notes for the major foreign markets, the seven mistakes that cost foreign sellers the most money, a realistic timeline, the actual cost of full compliance, and the red flags that mean you need a specialist on the phone today rather than next quarter.

By the end you should be able to: (a) read your own Amazon Inventory Event Detail report and know which states it has just put you in, (b) tell the difference between economic nexus and physical nexus without flinching, (c) calculate your real exposure rather than guess at it, and (d) decide whether you are going to manage this yourself, hand it to a specialist, or hand it to us.

One promise up front. This guide does not name the SaaS calculation tools that try to sell foreign sellers a $200-a-month subscription and call it “compliance.” Tax software is calculation. Compliance is the registrations, the filings, the remittances, the nexus monitoring, the audit defence and the voluntary disclosure work — done by a human who answers when a state revenue department writes to you. Those are different things. We will keep them separate.

The 7 Layers of U.S. Sales Tax Every Foreign Seller Must Understand

Before we go deep on any one piece, here is the whole stack on a single page. If you can hold these seven layers in your head, the rest of the U.S. sales tax conversation becomes legible. Skip a layer and you will eventually be surprised by it — usually in the form of a letter from a state.

1. There is no U.S. federal sales tax. Sales tax is a state-level tax, administered independently by 45 states plus D.C. Five states (Alaska, Delaware, Montana, New Hampshire, Oregon) have no statewide sales tax, although Alaska local jurisdictions do impose their own. This is the structural fact everything else sits on top of.
2. Economic nexus (the Wayfair rule). Since June 2018, a state can require you to collect sales tax based purely on your economic activity into that state — dollars of sales or number of transactions — with no physical presence required. Most states use $100,000 in sales or 200 transactions; some use higher thresholds; many states have repealed the transaction count and now use revenue only.
3. Marketplace facilitator laws. Amazon, Walmart Marketplace, eBay, Etsy and similar platforms collect and remit sales tax on your behalf for sales made through their platform, in nearly every state with sales tax. This is real relief — but it does not eliminate your registration obligations, and it does not cover direct sales through Shopify, WooCommerce or your own site.
4. Physical nexus and the FBA inventory trap. Storing inventory in a state — even a single pallet for a single day — creates physical nexus in that state. There is no de minimis exception. Amazon FBA redistributes your inventory across 20+ states automatically. Foreign sellers using FBA typically have nexus in 15-20 states from day one and almost never realise it.
5. State registration. Once you have nexus, you must register with that state’s tax authority before collecting tax. Registration requires an EIN. Most registrations are free, take 1-5 business days, and produce a sales tax permit/seller’s permit number that you use on every return.
6. Filing and remittance cadence. Each state assigns you a filing frequency (monthly, quarterly or annually) based on the tax you collect. Due dates, e-file rules and electronic payment requirements vary state by state. Zero-dollar returns are mandatory in many states even when you have no activity.
7. Audit defence and Voluntary Disclosure Agreements. States audit remote sellers. Statutes of limitation typically run three to four years from a filed return, but unlimited if you never filed. When historical exposure exists, Voluntary Disclosure Agreements (VDAs) cap the look-back period and waive penalties in exchange for proactive disclosure.

Below, each layer gets its own section. Read in order if this is new to you; jump if you already know the basics.

Layer 1: There Is No U.S. Federal Sales Tax

This is the single most disorienting fact for sellers arriving from a VAT or GST country. In South Africa you have one VAT rate, one revenue authority (SARS) and one return. In the UK, one VAT rate, one HMRC. In India, GST is administered centrally with state components, but you still file in a single system. In Australia, GST is federal. In the EU, you can use IOSS to handle remote sales to the entire bloc through a single registration.

The United States does not work that way. There is no IRS sales tax. There is no Department of Sales Tax in Washington. Each state is its own sovereign tax jurisdiction for sales tax purposes, with its own statute, its own revenue department, its own rates, its own taxability rules, its own forms and its own audit teams. Forty-five states plus Washington D.C. impose a sales tax. Five — the so-called NOMAD states (New Hampshire, Oregon, Montana, Alaska, Delaware) — do not impose a statewide sales tax, although Alaska local jurisdictions can and do.

Rates vary wildly within and across states

California’s statewide rate is 6%, before local add-ons that push the combined rate above 8% in most cities. Texas charges 6.25% statewide, with local additions reaching 2% for a combined rate of up to 8.25%. Colorado’s state base rate is only 2.9%, but home-rule cities can stack on another 8%+, producing combined rates above 11%. Indiana and Rhode Island sit at 7% statewide. A single U.S. ZIP code can sometimes span multiple tax jurisdictions with different combined rates. This is not a glitch; it is the system working as designed.

Income tax treaties do not help you here

This is the trap that catches more foreign sellers than any other. The United States has income tax treaties with the UK, South Africa, Australia, India, most EU countries, Canada and many more. Those treaties can reduce or eliminate U.S. federal income tax on certain types of business profits and cross-border income. They have zero application to state sales tax. Sales tax is a state-level transaction tax. Income tax treaties are bilateral federal-level instruments. A South African seller with a U.S./SA treaty is fully exposed to state sales tax obligations in every state where she has nexus, regardless of any treaty position she takes on Form 1120-F or Form 8833.

For the foundational Supreme Court decision that reshaped this whole framework, see our walkthrough of South Dakota v. Wayfair Explained. For the high-level question of whether non-U.S. sellers really do owe this tax, see Do Non-U.S. Sellers Need U.S. Sales Tax?.

Layer 2: Wayfair and Economic Nexus

From 1992 until 2018, U.S. sales tax law operated under the Quill v. North Dakota rule: a state could only require you to collect sales tax if you had physical presence inside the state — an office, a warehouse, employees, contractors. A foreign seller in Cape Town shipping into California had no obligation, period. That was the rule for 26 years.

On 21 June 2018 the U.S. Supreme Court overturned Quill in South Dakota v. Wayfair, Inc.. The Court held that states may require remote sellers to collect and remit sales tax based on economic activity alone — no physical presence required — provided the state’s threshold is not unduly burdensome. South Dakota’s threshold, which the Court upheld, was $100,000 in sales or 200 separate transactions per year. Within 24 months almost every state with a sales tax had passed its own economic nexus statute mirroring or modifying the South Dakota model.

The 2026 economic nexus landscape

The default threshold for most states remains $100,000 in sales OR 200 transactions, whichever is hit first. But the variations matter:

• $500,000 thresholds: California, Texas and Tennessee use a higher $500,000 sales threshold. New York is $500,000 AND 100 transactions (both required).
• Revenue-only states: As of 1 January 2026, at least 16 states — including South Dakota itself, Indiana, Louisiana, Maine, Washington, Illinois (effective 1 Jan 2026) and others — have repealed the 200-transaction rule and use revenue only. Kentucky eliminates its transaction threshold on 1 August 2026.
• Measurement period: Some states measure prior calendar year, some measure current calendar year, some use rolling 12 months, and a few use specific periods (Connecticut measures the 12 months ending 30 September).

Per-state, not nationwide

Economic nexus is measured one state at a time. Total U.S. sales of $2 million spread thinly across 50 states might not cross a single threshold. The same $2 million concentrated 80% into California and 20% into Texas crosses both. The implication: you have to track sales by destination state, not just in aggregate.

Exempt sales and marketplace sales usually count toward the threshold

In most states, the threshold includes gross sales, not just taxable sales. Resale sales to wholesalers count. Sales of exempt products count. And critically, in many states, sales you make through Amazon and other marketplaces count toward your own threshold, even though Amazon is the one collecting the tax. That means a seller doing $90,000 on Amazon and $20,000 on Shopify into California has crossed the $100,000 sales threshold (California’s threshold is $500,000 for economic nexus, but the principle holds in lower-threshold states).

For the deep-dive version of this layer, the country-by-country threshold table and the question of how thresholds interact with international sellers specifically, read Economic Nexus Thresholds for International Sellers.

Layer 3: Marketplace Facilitator Laws

The states learned a hard lesson in the months after Wayfair: chasing millions of individual remote sellers for registration and collection was administratively impossible. So they did the sensible thing. They wrote laws that delegated collection to the platforms.

A marketplace facilitator is a platform that does three things: lists third-party sellers’ products, processes payment, and (often) handles fulfilment or other transaction services. Amazon, Walmart Marketplace, eBay, Etsy, TikTok Shop and similar platforms fit this definition. By 2026, 46 states plus D.C. have marketplace facilitator laws on the books. Under those laws, when you sell a $40 hoodie to a buyer in Ohio through Amazon, Amazon calculates the Ohio sales tax, collects it at checkout, remits it to the Ohio Department of Taxation, and shows you the net of fees and tax in your seller payout.

This is real relief — but it is not a magic eraser

Four things foreign sellers routinely get wrong about marketplace facilitator laws:

1. It only covers sales through that marketplace. If you sell on Amazon AND on your own Shopify store, Shopify sales are entirely your responsibility — platform calculation alone does not equal compliance. Shopify is an ecommerce software platform, not a marketplace facilitator. Same for WooCommerce, BigCommerce, Squarespace.
2. Marketplace collection does not eliminate your registration obligation. If you have nexus in a state — typically because Amazon has stored your inventory there — most states still require you to register, even if every sale you make is through Amazon and Amazon collects every cent of tax. You file a return that reports the marketplace-collected sales and shows the tax as already remitted by the facilitator. Skipping registration because “Amazon collects” is a top-three audit trigger for FBA sellers.
3. Marketplace sales usually count toward your own economic nexus threshold. In most states, Amazon sales count toward your seller-level threshold. If you do $90k on Amazon and $20k direct in a state, you have crossed a $100k threshold in aggregate, even though Amazon is collecting on the $90k portion.
4. Some marketplaces are not facilitators. Shopify is not a marketplace; it is a SaaS platform. Faire and certain B2B platforms may not be facilitators in all states. Always verify per-platform, per-state.

For the platform-by-platform mechanics, see Marketplace Facilitator Laws Explained, Amazon FBA Sales Tax for International Sellers, Shopify Sales Tax for International Sellers, and Walmart Marketplace Sales Tax for International Sellers.

Layer 4: Physical Nexus and the FBA Inventory Trap

If economic nexus is the layer most sellers have heard of, physical nexus is the layer that quietly does the most damage. The rule is simple and brutal: storing inventory in a state — in any quantity, for any length of time — creates physical nexus in that state. There is no de minimis exception. A single pallet stored for a single day is enough. Physical nexus pre-dates Wayfair by decades and was unaffected by it.

Amazon FBA: nexus in 15-20 states from day one

Amazon operates roughly 1,300 fulfilment centres, sort centres and delivery stations across more than 20 U.S. states. When you ship inventory into FBA, Amazon’s distribution algorithm splits and redistributes that inventory across its network based on demand forecasting, geographic optimisation and capacity. You have no control over where your units physically end up. According to the Sales Tax Institute, 89% of FBA sellers have nexus in at least 10 states; the average FBA seller has nexus in 18 states. For a foreign seller who has just sent her first 1,000 units to a single FBA receive centre in New Jersey, the practical reality is that within weeks she likely has inventory — and therefore physical nexus — in California, Texas, Pennsylvania, Virginia, Illinois, Tennessee, Indiana, Florida and several more.

How to see your real footprint

The single most useful exercise any FBA seller can do is to pull the Inventory Event Detail report from Amazon Seller Central. It shows every state where Amazon has placed your inventory, the dates inventory entered and left, and the quantities. That report is also the foundation of any honest historical exposure analysis if you have to do a voluntary disclosure later.

Physical nexus is harder than economic nexus, not easier

Three things make FBA-driven physical nexus particularly painful for foreign sellers:

• It is immediate. There is no $100,000 ramp. The moment Amazon’s truck unloads at the Memphis fulfilment centre, you have nexus in Tennessee, even if you have made zero sales in Tennessee.
• It triggers retroactively. If a state audits you three years later, the look-back goes back to the first day of inventory presence — not to the date you finally registered. Statutes of limitation typically run from the filing of a return, so if you never filed, the look-back can be unlimited.
• It often triggers state income tax too. Most income tax states view inventory presence as “doing business” in the state, which triggers state income tax filings, franchise tax in some cases, and — in California — the infamous $800 annual LLC fee imposed on any LLC “doing business” in California, regardless of the amount of business done.

3PLs are not a safe harbour

Some sellers move from Amazon FBA to a third-party logistics provider (3PL) thinking it solves the problem. It does not. If you control inventory at a 3PL warehouse, that location creates physical nexus in exactly the same way. The only inventory-related arrangement that avoids creating physical nexus is genuine dropshipping where a supplier you do not own holds inventory and ships to your customer.

For the FBA-specific deep dive on this, see Amazon FBA Sales Tax for International Sellers.

Layer 5: State Registration

Once you have nexus — economic or physical — the next step is registration. This step has one rule and many sub-rules. The one rule: register before you collect. Collecting sales tax in a state where you are not registered is a separate compliance violation. It is not enough to flip the toggle in Shopify; the state must have issued you a sales tax permit number first.

What every registration requires

You will need: a U.S. EIN, a principal business address (your overseas address is usually fine, though some states prefer a U.S. address), an identification document (passport works for foreign owners), a six-digit NAICS code that fits your business, ownership and officer details, and — in some states — a registered agent inside the state. Some states ask for a security bond from foreign sellers; Massachusetts requires up to $10,000 and Connecticut up to $5,000, refundable after a clean two- to three-year filing record.

Foreign sellers: getting the EIN first

A non-U.S. owner cannot apply for an EIN online; the IRS online system rejects applications without an SSN or ITIN. The mechanism that works is calling the IRS International EIN line at +1 267-941-1099 (Monday-Friday, 6am-11pm ET; not toll-free). Have your Form SS-4 filled out before you call. The agent typically issues an EIN on the call, in roughly 15 minutes. We have published the step-by-step in How to Apply for a U.S. EIN as a Foreign Entity.

Registration without a U.S. address

Most states accept foreign business addresses on the registration form. A handful prefer or require a U.S. address; these are usually best handled with a registered agent service address. The mechanics, state by state, are covered in U.S. Sales Tax Registration Without a U.S. Address.

Registration cost and timing

Most states charge $0 for the registration itself. A few charge $10-$200. Online registrations are usually approved in 1-5 business days. A handful of states still require paper applications and can take 2-4 weeks. For a foreign seller registering in 15 states, plan on 2-4 weeks of focused effort if doing it yourself, or 2-3 weeks calendar time if a specialist is doing it in parallel.

What you receive

Each state issues a sales tax permit, seller’s permit, sales and use tax license or similar document. It contains your account number, which goes on every return. Many states also require you to display a paper certificate at your place of business — not directly relevant to foreign sellers, but worth knowing if you ever set up a U.S. warehouse.

Layer 6: Filing and Remittance Cadence

Registration gets you into the system. Filing keeps you in it. Each state assigns a filing frequency at the time of registration, usually based on the tax volume the state estimates you will collect.

How states assign frequency

Common rules: monthly filing for sellers expected to collect more than $200-$1,500 per month in tax (the exact trigger varies); quarterly for moderate sellers; annual for very low-volume sellers. California assigns monthly prepayment obligations to sellers whose average monthly liability exceeds $17,000. Texas and most other large states assign frequency at registration and may reassess annually.

Due dates that don’t line up

Filing deadlines are not standardised. Some states are the 15th of the following month, some the 20th, some the last day of the month. Texas monthly returns are due the 20th. California monthly returns are due the last day of the following month. New York is quarterly with quarter-specific dates. Each state has its own e-file portal, its own user credentials, its own forgotten-password recovery flow. For a seller registered in 15 states, the calendar is the single biggest source of failure mode.

Zero returns are mandatory

Most states require a return every period even when you had zero sales. Forgetting to file a zero return triggers late-filing penalties even though no tax was owed. This is the most common penalty foreign sellers actually incur.

Remittance: ACH, wire, or rejection

Most states require electronic payment. ACH transfer is the default; wire is accepted in many states, sometimes with a fee. Foreign-issued debit cards and credit cards are routinely rejected by state revenue portals. This is one of the reasons U.S. banking is non-negotiable infrastructure for foreign sellers — see Layer 4 of the four-pillar infrastructure below, or read How to Open a U.S. Business Bank Account as a Non-Resident.

Penalties

Late filing penalties are typically 2%-10% of the tax due per month, capped at 20%-35%. Late payment penalties stack on top. Interest accrues daily at 6%-12% per year. A $10,000 monthly liability filed 60 days late and unpaid can incur an additional $1,200-$2,500 in penalties and interest in many states.

Layer 7: Audit Defence and Voluntary Disclosure Agreements

States audit. The frequency and aggression vary, but the trend over the last five years is clear: state revenue departments have built specialised remote-seller audit teams and are actively working through Amazon seller lists, marketplace data and inter-state information-sharing agreements to find unregistered sellers.

How an audit starts

Almost always with a letter. Often called a “Nexus Questionnaire,” “Notice of Possible Tax Liability” or simply “Demand to Register.” The letter typically gives the seller 15-45 days to respond and asks for sales data going back three to four years. Do not respond to one of these letters without a tax advisor. The wording of your response often determines the look-back period and the penalty posture the state takes.

Statutes of limitation

The general rule: states can audit three to four years back from the filed return or its due date, whichever is later. The trap: if you never filed a return in a state where you had nexus, most states impose no statute of limitations at all. The state can go back to your very first day of nexus. For an FBA seller five years in, that can mean five years of unreported tax on the table, in every state where inventory has sat.

Voluntary Disclosure Agreements (VDAs)

Nearly every state offers a VDA programme. The seller approaches the state — ideally through counsel or a specialist, on an anonymous basis — declares an intention to disclose, negotiates a look-back period (typically capped at three or four years even when statute of limitations would otherwise be unlimited), pays the back tax with interest, and in exchange the state waives all penalties and confirms the seller is closed for the disclosed periods. A VDA is the single most powerful tool a foreign seller has when historical exposure exists.

The VDA decision framework

VDAs are not free. They cost professional fees ($2,000-$5,000 per state in advisory and negotiation costs) plus the back tax and interest. Total exposure for a seller with 3-4 years of unregistered FBA activity across 15 states routinely reaches $50,000-$200,000+. The decision — disclose proactively, or wait and hope — turns on (a) the size of the exposure, (b) how visible you are to the state (large FBA footprint and Amazon Seller Central data make you very visible), (c) whether you are planning to grow, sell or raise capital (clean tax history matters), and (d) your appetite for tail risk.

Do not file a VDA without an exposure analysis first

The single most expensive mistake in VDA work is sellers calling a state directly, identifying themselves and then discovering they have just disclosed liability they could have managed differently. Always run an exposure analysis first — ideally with a specialist — then decide.

The 4-Pillar Infrastructure Every Foreign Seller Needs

Knowing the seven layers tells you what you owe. The four-pillar infrastructure is how you actually operate. Skip a pillar and the system will break sooner or later. Build all four and you can run a clean compliance operation from anywhere in the world.

1. U.S. Employer Identification Number (EIN). Every foreign seller needs an EIN. It is the federal tax ID used for state sales tax registrations, for opening a U.S. bank account, for filing the federal returns your LLC may require, and for proving identity to Amazon, Walmart and Stripe. Cost: free. Time: one phone call to the IRS international line at +1 267-941-1099. You do not need an ITIN to get an EIN if you have a foreign entity; you do need to fill out Form SS-4 in advance. Full step-by-step in How to Apply for a U.S. EIN as a Foreign Entity.
2. U.S. LLC (optional, often recommended). A U.S. limited liability company gives you (a) limited liability protection separating your personal assets from the business, (b) easier access to U.S. banking and payment rails, (c) credibility with U.S. wholesalers and suppliers, and (d) clean tax structure for the federal layer. Single-member LLCs owned by a non-U.S. person are disregarded entities for federal tax purposes but must still file Form 5472 with a pro forma Form 1120 every year. Missing Form 5472 carries a $25,000 penalty per form per year, even if no tax is owed. Form-state choices: Wyoming and New Mexico for low-cost, low-compliance home base; Delaware for sellers raising capital; avoid California as a formation state due to the $800 annual fee. If you sell into California, you may still owe the $800 fee as a foreign LLC “doing business” there.
3. U.S. ACH-capable banking. State revenue portals require electronic payment via ACH or wire. Foreign-issued cards are rejected. A U.S. bank account in the LLC’s name solves the problem permanently. The fintechs that actually work for non-residents are Mercury, Lili and Relay; they open accounts online for foreign owners, charge no monthly fee, and support both ACH and wire. Use Wise as a complement, not a substitute — Wise is excellent for receiving USD payouts and converting to your home currency, but it is a money services business, not a U.S. bank, and a handful of state portals will not accept ACH from Wise USD balances. The detailed walkthrough is at How to Open a U.S. Business Bank Account as a Non-Resident.
4. Registered Agent. A registered agent is a person or service with a physical address inside the state where your LLC is formed and (separately) in every state where you have registered as a foreign LLC. The agent receives official mail — tax notices, audit letters, lawsuit service of process — and forwards it to you. Cost: $50-$300 per state per year. For a foreign owner, this is non-negotiable. Missing a tax notice because it sat unopened at an old registered agent address is one of the most expensive avoidable mistakes a foreign seller can make.

The total infrastructure setup cost for a foreign seller is typically $200-$800 upfront and $300-$1,000 per year ongoing, before any compliance work itself. This is a small fraction of the cost of a single avoided audit.

Decision Tree: Do You Owe Sales Tax in That State?

This is the eight-step process for working out, state by state, whether you have a registration obligation. Run it once for every state where you might have presence; the output is a state-by-state nexus map that becomes the foundation of your compliance plan.

Step 1: Do you have physical presence in the state?

Pull your Amazon Inventory Event Detail report. List every state where you have ever had inventory — currently or historically. Add any state where you have employees, contractors, an office, a 3PL warehouse, a trade-show booth that stayed past a certain number of days, or any other physical footprint. Any state on this list has physical nexus — mandatory registration.

Step 2: For every state not already on the physical-nexus list, calculate your sales into that state

Aggregate sales across all channels — Amazon, Shopify, Etsy, Walmart, eBay, direct B2B — over the state’s measurement period. Most measure prior calendar year or current calendar year. A few use rolling 12 months.

Step 3: Compare to the state’s economic nexus threshold

Default: $100,000 in sales or 200 transactions. Exceptions: California, Texas, Tennessee at $500,000; New York at $500,000 AND 100 transactions; an expanding list of states at $100,000 revenue only with no transaction count. If you are over, you have economic nexus — mandatory registration.

Step 4: Affiliate or click-through nexus

If you pay commissions to U.S.-based affiliates or have referral relationships with U.S.-based influencers, check whether each state’s affiliate nexus law catches you. Generally less common for foreign sellers but worth a pass.

Step 5: Marketplace vs. direct treatment

For every nexus state, identify what proportion of your sales are marketplace-collected (Amazon, Walmart, Etsy) versus direct (Shopify, your own site). The marketplace portion is collected for you; the direct portion is your responsibility. In most states, both count toward your seller-level threshold for nexus purposes.

Step 6: Build your state-by-state nexus table

For every state, mark one of: No Nexus / Economic Nexus / Physical Nexus / Marketplace-Collected (registration may still be required). Note the date the obligation began (first day of inventory presence, or first day of the month after threshold was crossed, depending on state).

Step 7: Identify the applicable rate(s)

For each registration state, identify the statewide rate plus any local rates that apply to your destination ZIP codes. Most checkout-level tax software handles this; the compliance work is in the back-end filings, not the front-end calculation.

Step 8: Verify marketplace facilitator treatment

For each nexus state, confirm whether the marketplaces you use are collecting tax on your behalf for that state. Almost universally yes for Amazon and Walmart Marketplace; verify each platform individually. Document this as part of your compliance file for audit defence.

Done properly, this decision tree takes 4-8 hours of focused work for a seller with 10-15 nexus states. The output is the map you operate from. Read more on this in the dedicated Sales Tax by State Guides and Compliance hub.

Country-Specific Notes for Major Foreign Markets

The seven-layer framework is the same regardless of where you live. The friction points — banking, currency, home-country tax reporting, treaty interactions — vary by country. Below are the notes that matter most for sellers in each of the major foreign markets we work with.

South African Sellers

Three things matter for South African sellers more than for any other cohort. First, SARS regulates outbound foreign exchange under the Exchange Control framework, and traditional South African banks (Capitec, Standard Bank, FNB, ABSA, Nedbank) impose meaningful friction on USD wire transfers and frequently rate-limit them. The practical answer is to receive USD into Mercury or Lili (which open for South African beneficial owners despite some perception otherwise), hold balances there, and only convert to ZAR when you need to repatriate. Second, the rand is volatile against the dollar; price products in USD on Amazon and accept that COGS-denominated-in-ZAR plus revenue-denominated-in-USD is a permanent margin sensitivity to manage. Third, you remain a South African resident for tax purposes and SARS taxes residents on worldwide income; a U.S. LLC’s profits flow through to your South African return regardless of whether you remit them to South Africa, and the U.S./SA double tax treaty governs how the credits work for federal income tax, but does not touch state sales tax. Full country deep-dive: U.S. Sales Tax for South African Sellers.

UK Sellers

The biggest single advantage UK sellers have is mental: VAT prepared you for thinking about destination-based consumption taxes, registration thresholds and periodic returns. The biggest single misconception is that the U.S. is just a federalised version of VAT. It is not. There is no national IOSS for U.S. sales tax; there is no place-of-supply rule simplification; there is no monthly EU-style return covering all states. Banking-wise, UK banks (HSBC, Barclays, NatWest, Lloyds, Starling, Wise’s UK entity) handle outbound USD wires reasonably well, and Mercury/Lili open for UK owners straightforwardly. The U.S./UK income tax treaty offers federal-level relief on certain business profits, but — again — not on state sales tax. Full country deep-dive: U.S. Sales Tax for UK Sellers.

EU Sellers

EU sellers arrive with strong VAT instincts and one specific cognitive trap: assuming that what works for EU remote sales (IOSS, OSS, one-stop-shop simplifications) will have an analogue in the U.S. It does not. Streamlined Sales Tax (SST), a cooperative framework joining 24 states, provides some consistency in definitions and a single-form registration into those 24 states, but you still file per-state. Digital goods rules vary dramatically by U.S. state in a way they do not in the EU after the 2015 place-of-supply reforms. EU sellers shipping from EU warehouses directly to U.S. consumers (i.e. no FBA, no U.S. inventory) have no physical nexus and may have no economic nexus either, depending on volume — a configuration worth modelling carefully if it fits your business. Full country deep-dive: U.S. Sales Tax for EU Sellers.

Indian Sellers

Indian sellers face the strictest outbound foreign exchange regime among the major foreign markets: the Reserve Bank of India’s Liberalised Remittance Scheme caps outbound transfers at USD 250,000 per individual per financial year, and corporate outbound under ODI rules requires structured approvals. The practical solution most Indian sellers adopt is to keep USD balances offshore in Wise, Mercury or a similar tool and only repatriate when needed; the U.S. LLC’s earnings then sit in the U.S. banking layer rather than landing in India and triggering FEMA reporting friction. Indian residents are taxed on worldwide income, so the LLC’s profits flow through to your Indian return; the U.S./India income tax treaty allocates taxing rights but, again, does not affect state sales tax. Full country deep-dive: U.S. Sales Tax for Indian Sellers.

Australian Sellers

Australian sellers come from a single-rate, single-administrator GST world that is structurally very different from the U.S. patchwork. The mental shift is the biggest part of the work. Practically, Australian banks (CBA, ANZ, NAB, Westpac) generally do not accept incoming or outgoing ACH from U.S. state revenue portals, and Australian-issued cards are routinely rejected; Mercury and Lili work well for Australian owners. The Australia/U.S. DTA governs income tax but not sales tax. The ATO requires worldwide income reporting and is increasingly active on foreign account reporting; if you set up a U.S. LLC, expect to need it on your Australian tax return.

The 7 Most Costly Mistakes Foreign Sellers Make

Across hundreds of foreign-seller engagements, seven mistakes account for the bulk of the avoidable cost. Read this section twice if you read nothing else.

1. Assuming an income tax treaty exempts you from sales tax. The U.S. has income tax treaties with the UK, EU member states, Australia, South Africa, India, Canada and most major economies. None of them touch state sales tax. Sales tax is a state-level transaction tax on a different legal foundation. If you have read about treaty exemptions and concluded that you have no U.S. tax obligations of any kind, you are looking at the wrong tax.
2. Assuming that Amazon collecting tax means you have no registration obligation. In most states, if you have physical nexus (because Amazon stored inventory there), you must register — even if every cent of tax was collected and remitted by Amazon. You then file a return showing the marketplace-collected sales and zero additional tax owed. Skipping the registration step is the most common audit trigger we see.
3. Underestimating physical nexus. One pallet for one day creates permanent physical nexus in that state. There is no de minimis. There is no “it was only a few units.” If Amazon put inventory in Indiana for a week three years ago, you have had Indiana nexus since that week and the look-back is potentially unlimited because you never filed.
4. Treating an EIN as the end of the compliance journey. An EIN is necessary but not sufficient. It is a federal tax ID; it is not a state registration. Sellers who get an EIN, enable Shopify tax calculation, and assume they are compliant are stacking up exposure month after month.
5. Filing a VDA without an exposure analysis first. A VDA is powerful, but it is also a binding admission of liability. Running into a state’s VDA programme without first calculating the cost is how foreign sellers end up paying six-figure settlements that more strategic disclosure could have reduced or restructured.
6. Conflating sales tax with state income tax. They are separate obligations on different legal foundations. FBA physical nexus often triggers both. A seller who handles sales tax but ignores state income tax filings in income-tax states has half a compliance solution.
7. Not tracking sales by destination address. If a state audits you and you cannot produce a clean reconciliation of sales into that state, the auditor will apply estimates that work in the state’s favour. Build the reporting habit early: monthly sales-by-state extract from every channel, reconciled to the bank.

The Typical Compliance Timeline from First Sale to Steady State

Here is what the journey actually looks like for the typical foreign seller who started without a compliance plan, in roughly the order it tends to play out.

Month 1: First U.S. sale

You make your first sale, often through Amazon or Etsy. If it is a marketplace, the platform collects the tax. You have zero nexus yet, zero obligation.

Month 2-3: First FBA shipment

You ship 500-1,000 units to an Amazon receive centre. Within days, Amazon redistributes inventory across 6-12 fulfilment centres. You now have physical nexus in 6-12 states. You almost certainly do not know this yet.

Month 4-6: Sales accelerate; first state letter arrives

Marketplace sales build. If you also sell on Shopify, direct sales may start approaching state thresholds. Somewhere in this window, the first nexus questionnaire or demand-to-register letter arrives — usually from California, Texas, Washington or New York, often triggered by Amazon-supplied data or state cross-matching.

Month 6-12: Reality, then triage

You realise the scale of the obligation. You commission a nexus and exposure analysis (typical cost $1,500-$3,000 with a specialist). Output: a state-by-state map of where you have nexus, when it started, and what the back-tax exposure is.

Month 12-18: Registration, historical filings, VDA decisions

You register in every state where nexus is active and exposure is manageable. Where historical exposure is significant ($25,000+ in a single state), you weigh a VDA. VDAs typically take 2-6 months per state to negotiate and close.

Month 18-24: Steady state

Filings are running. Monthly, quarterly and annual returns are on a calendar. Marketplace facilitator data is reconciled. Direct-channel collection is happening through your checkout stack and reconciled to filings. Monthly time investment drops to 1-3 hours if you have software or a specialist running it.

Year 3+: Mature compliance

You are registered in 15-25 states, the rhythm is established, and the conversation shifts from “are we compliant” to “how do we optimise.” The compliance budget is a known operational line item rather than a recurring crisis.

The Cost Structure of Full Cross-Border Compliance

Here is what compliance actually costs a foreign seller doing meaningful U.S. volume. These are 2026 numbers based on the engagements we run.

One-time setup

• EIN: free (one phone call to the IRS).
• ITIN if required: free to apply; ~$50-$100 if you use a CAA (Certified Acceptance Agent) to handle the identity-document piece.
• U.S. LLC formation: $35-$500 depending on state, typically $100-$200 in Wyoming or New Mexico.
• Registered agent (year one): $50-$300 per state.
• U.S. business banking opening (Mercury, Lili, Relay): $0 monthly, $0-$25 per wire.

Total setup: typically $200-$800.

Annual recurring

• Registered agent: $50-$300 per state per year.
• State LLC compliance (annual reports, franchise taxes): $0-$800 per state. California $800 annual LLC fee is the big one if you have California nexus.
• Compliance software (calculation only): $200-$1,500 per year depending on volume and number of states. This is the calculation layer, not the full-service compliance layer.
• Done-for-you compliance service (registration management, filings, remittance, nexus monitoring, audit support): variable; the Sales Tax Compliance USA service is priced as a single flat monthly fee covering everything in scope, with no per-state surcharges or per-filing add-ons.
• Federal Form 5472 + pro forma 1120 for foreign-owned single-member LLCs: $500-$1,500 annually with a CPA.

Variable / event-driven

• Nexus and exposure analysis: $1,500-$3,000.
• VDA per state: $2,000-$5,000 in professional fees plus the back tax and interest.
• Audit representation: $5,000-$50,000+ depending on scope.

What “too cheap” actually looks like

If you see a U.S. sales tax “compliance” subscription advertised at $39-$99 per month, that is calculation software only. It does not register you, file your returns, remit your tax, defend you in an audit or negotiate a VDA. It is a piece of infrastructure, not a compliance solution. Treat that pricing tier accordingly when budgeting.

When to Get Help: Red Flags That Mean You Need a Specialist Today

Some situations are perfectly manageable with this guide and a careful Sunday afternoon. Others mean you need professional help on the phone tomorrow. Here are the red flags.

• You have been using Amazon FBA for six months or more and have not registered in any state. You almost certainly have multi-state physical nexus that has been accumulating retroactive exposure every day. Stop reading and book a call.
• Your direct-channel sales (Shopify, WooCommerce, your own site) into any single state exceed $100,000 over the measurement period. You are over the economic nexus threshold in that state, with no marketplace collecting for you, and every day of delay adds tax, interest and penalty.
• You have received any letter from any state tax authority — “nexus questionnaire,” “demand to register,” “notice of possible liability,” “audit notice.” Do not respond without a specialist. The wording of your reply often determines look-back periods and penalty posture.
• You have marketplace sales above $10,000 per month into multiple states. You are approaching or past economic nexus thresholds in several states simultaneously, even if Amazon is collecting. Time to map and register.
• You have used third-party logistics or fulfilment-by-merchant arrangements and cannot reconstruct which states held inventory. Historical nexus may exist that you cannot see; a forensic exercise with the 3PL is needed.
• You sell excise-taxable products — alcohol, tobacco, nicotine, firearms, certain CBD products. A separate regulatory layer applies on top of sales tax, with its own registration, filing and reporting rules.
• You are about to raise capital, sell the business, or take on a new strategic investor. Tax due diligence will find unregistered nexus. Clean it up before the diligence starts, not during.

Done-For-You: Why We Built Sales Tax Compliance USA

Here is the second time I will introduce myself, because at this point in the guide it actually matters. I am Paul le Roux. CA(SA), ICAEW. Twenty-plus years of cross-border tax practice. I built Sales Tax Compliance USA because the international ecommerce sellers I worked with kept asking the same question and getting one of three unsatisfying answers.

They would ask: “I sell into the U.S. — what is my sales tax position?” The answers they kept getting were: (1) a $39-a-month tax calculation subscription, which is software, not compliance; (2) a U.S. CPA firm that quoted $5,000 per state and treated cross-border sellers as an awkward edge case; or (3) silence, because most accounting practices simply do not work with foreign-resident clients holding U.S. tax obligations.

None of those are the right answer for a Cape Town founder doing $400,000 a year on Amazon FBA with nexus in 18 states. Or a London-based Shopify brand doing $1.2 million a year with FBA and direct, looking at a multi-year historical exposure question. Or a Mumbai-based seller trying to figure out whether to repatriate USD to India or hold it offshore and pay state taxes from a Wise balance.

Sales Tax Compliance USA is the done-for-you service that fills the gap. We are not software. We are not a SaaS dashboard. We are the actual human team — led by a Chartered Accountant with two decades of cross-border practice — that handles the whole thing end-to-end:

• Nexus and exposure analysis using your real marketplace and channel data.
• EIN and ITIN where needed, plus LLC formation in the right state for your business.
• U.S. banking onboarding through Mercury, Lili or whichever fintech actually works for your country and structure.
• State-by-state registration in every nexus state, handled by us with your sign-off.
• Monthly, quarterly and annual return filings in every state, including the zero returns.
• Remittance from your U.S. account on schedule.
• Marketplace facilitator reconciliation so your filings reflect what Amazon and Walmart are actually collecting.
• VDA negotiation where historical exposure makes one prudent.
• Audit response and representation if a state writes to you.
• Ongoing nexus monitoring as your sales pattern evolves.

One monthly fee. No per-state surcharges. No per-filing add-ons. No surprise invoices when a state asks a question. You get a partner who answers when the state writes, not a dashboard with a chat icon.

If you are a foreign ecommerce seller and you have read this far, you already know whether you need this. The first conversation is free and concrete — we will map your real nexus footprint from your actual sales data, tell you exactly where you stand, and quote the fee to take it from here.

Book a Free Multi-State Nexus Consultation

Where to Go Next: The Cluster

This hub is the operating manual. The cluster below goes deeper on every individual piece. Bookmark whichever you need.

• Foundational rulings and laws: South Dakota v. Wayfair Explained | Economic Nexus Thresholds for International Sellers | Marketplace Facilitator Laws Explained
• Setup guides: How to Apply for a U.S. EIN as a Foreign Entity | How to Open a U.S. Business Bank Account as a Non-Resident | U.S. Sales Tax Registration Without a U.S. Address
• State guides: Sales Tax by State Guides and Compliance
• Platform guides: Amazon FBA | Shopify | Walmart Marketplace
• Country guides: South African Sellers | UK Sellers | EU Sellers | Indian Sellers
• The threshold question: Do Non-U.S. Sellers Need U.S. Sales Tax?

Frequently Asked Questions

The Bottom Line

U.S. sales tax is genuinely complex, but it is not mysterious. Forty-five states plus D.C., seven layers of obligation, four pillars of infrastructure, one decision tree. Build it once, run it as an operational rhythm, and it becomes a known line item rather than a recurring crisis. The international sellers who succeed in the U.S. market are not the ones who out-think the system — they are the ones who respect it, build the infrastructure early, and put the right people in the right roles. The ones who fail are the ones who treat compliance as something to deal with after the audit letter arrives. By that point, retroactive exposure, penalties and Voluntary Disclosure Agreement costs have already done most of the damage.

If you are reading this as a foreign seller — from Cape Town, London, Berlin, Bangalore, Sydney or anywhere else — and you have a meaningful U.S. revenue line, the question is not whether you will eventually need to be compliant. The question is whether you build the compliance operation now, while the cost is small and the timeline is your own, or whether you build it under pressure after a state has already written to you. Build it now. If you want a Chartered Accountant who has done this for two decades to build it with you or for you, you know where to find us.

Book a Free Multi-State Nexus Consultation