If you’re a non-US seller staring at 45 different state registration portals, no EIN, no SSN, no US bank account, and an Amazon FBA inventory report that puts your stock in 18 states — this page is for you. Sales Tax Compliance USA registers foreign sellers across all 50 states under one engagement, one flat fee, no software for you to learn. We obtain the EIN, prepare every state application, deal with the responsible-officer field, and hand you the credentials and filing calendar. You don’t touch a DOR portal.
This is the long-form guide to how foreign-seller sales tax registration actually works in 2026 — what the law requires, where each state’s rules trip up non-US founders, and what our done-for-you service includes.
Why Foreign Sellers Need US Sales Tax Registration in 2026
Bold takeaway: US sales tax obligations don’t care where you’re based. If you ship to US customers or store inventory in a US warehouse, you have nexus — full stop.
The Wayfair decision and economic nexus apply regardless of seller nationality
In The U.S. Supreme Court’s Wayfair decision is the foundation of modern economic nexus, and its precise citation and holdings matter when analyzing remote-seller obligations. If you need a Wayfair-based nexus analysis for your facts, contact us for a current review., the US Supreme Court overruled the physical-presence requirement that had previously protected remote sellers. The decision said nothing about citizenship. A seller in Auckland, London, Berlin, Sydney, Toronto, Mumbai, or Shenzhen has the same economic-nexus exposure as a seller in Ohio.
After Wayfair, every state with a sales tax enacted economic-nexus legislation. Nearly every state that imposes a sales tax now enforces economic nexus on remote sellers, including foreign sellers, though specific thresholds and enforcement against foreign sellers vary by state. If you sell into the US from abroad or across multiple states, contact us for a current nexus review.. The five states with no statewide sales tax (Alaska, Delaware, Montana, New Hampshire, Oregon) are the only exceptions, and even Alaska has local sales tax in many municipalities through the Alaska Remote Seller Sales Tax Commission.
FBA inventory creates physical nexus the moment Amazon ships your goods to a US warehouse
Economic nexus gets the headlines, but for Amazon FBA sellers, physical nexus is the bigger trigger. The moment Amazon moves your inventory into a fulfillment center in California, Texas, Pennsylvania, or any other state, you have tangible personal property stored there for sale — which most states treat as physical-presence nexus on day one, with no dollar threshold.
California’s position is explicit. CDTFA’s Tax Guide for the Marketplace Facilitator Act states that “a marketplace seller is generally required to be registered with CDTFA if they are a retailer engaged in business in this state because they have a sufficient physical presence in this state,” and that physical presence “includes maintaining inventory in California.” In plain language: FBA inventory in California means you must register, even if 100% of your sales are facilitated by Amazon.
California’s nexus statute reaches retailers with a wide range of physical or representative connections to the state, and the precise statutory text controls in close cases. If you have any California footprint — inventory, contractors, agents, or temporary presence — contact us for a current review. FBA warehouses fall squarely within that language.
Marketplace facilitator laws don’t cover your Shopify or direct-to-consumer sales
Here’s the trap most foreign sellers fall into: they hear “Amazon collects sales tax for me” and assume they have no obligations. Wrong on two counts.
First, marketplace facilitator laws only cover the channel the marketplace is operating. If you also sell through Shopify, BigCommerce, WooCommerce, your own website, Etsy off-Amazon products, eBay, Faire, or wholesale to retailers — none of those are facilitated by Amazon. You collect and remit on those yourself once you cross nexus.
Second, several states require marketplace sellers to register and file even when 100% of their sales are facilitated. New York’s vendor registration rules turn on whether you are making taxable sales in the state and whether marketplace collection satisfies your obligations; registration is not automatically required simply because you sell handmade goods through a collecting marketplace (see NY DTF TB-ST-175). Connecticut requires Form OS-114 to be filed reporting all sales activity, even if no sales were made or no tax is due.
The done-for-you angle: we handle the channel mapping. We pull your Shopify, Amazon, and other channel reports, map them to nexus states, and tell you exactly where you must register, what frequency, and which sales each state expects on the return.
The Five Hurdles Foreign Sellers Hit (and How Our Service Removes Them)
Bold takeaway: Software competitors assume you already have an EIN, US bank account, US address, and an SSN for the responsible-officer field. We assume you have none of those — and we get you over each hurdle as part of the engagement.
Hurdle 1: No EIN
Almost every state DOR application has a field for Federal Employer Identification Number. Without one, you can’t submit. A non-US person without an SSN or ITIN can obtain an EIN by filing IRS Form SS-4 by fax or mail with “Foreign” entered in the responsible party SSN/ITIN field. The IRS issues EINs to foreign applicants regularly — but the process is paper-based, the fax queue is unpredictable, and any error means starting over.
We file SS-4 on your behalf as part of the engagement. No extra fee for first-time clients. We track the fax confirmation, follow up with the IRS international desk if needed, and deliver your EIN letter (CP 575) digitally.
Hurdle 2: No SSN or ITIN for the responsible officer field
This is where most foreign sellers get stuck — and where most DIY guides fall silent. Several state registration applications require an SSN or ITIN for at least one officer, owner, or “responsible person.” Some accept a foreign passport number or the entity’s EIN as a workaround; some explicitly require an SSN. The list changes year to year as portals get redesigned.
We’ve registered hundreds of foreign sellers and we know which fields each DOR’s application actually validates against, which fields can be left blank with explanatory notes, and which states require a phone or email follow-up to push the application through. If your specific entity structure or country combination needs a workaround a state hasn’t documented, contact us and we’ll confirm the current path before quoting.
Hurdle 3: No US bank account for ACH refunds/payments
Most states require electronic payment of sales tax. Many states only accept ACH debit from a US bank account, although a growing number now accept credit card payments (with a convenience fee) or ACH from accounts at banks like Wise, Mercury, or Relay that issue US routing/account numbers to non-US founders.
California requires EFT for taxpayers averaging over $10,000/month in tax liability, with accepted methods including ACH Debit, ACH Credit, Fedwire, and approved third-party processors (see CDTFA EFT payment options). New York’s PrompTax program is mandatory for high-volume filers and requires accelerated electronic payment.
We help you select the right banking option (Wise, Mercury, Payoneer, or a US LLC with a US bank), and where credit-card filing is acceptable we can route payments that way until your US banking is set up. You don’t get blocked at “remit tax” because your bank is in the wrong country.
Hurdle 4: No US business address
Some states accept a foreign mailing address; others want a US address for service of process. The fix isn’t always to form a US LLC — sometimes a registered-agent service or a virtual mailbox is enough. We coordinate this where required and tell you when it isn’t.
Hurdle 5: Apostille and notarization requirements in certain states
A small number of paper-only registration tracks (used when a state’s online portal won’t accept a foreign applicant) require notarized signatures or apostilled corporate documents from your home country. We tell you which states this applies to before kickoff, and our team handles the document flow with your home-country notary or apostille office.
What “Done-For-You” Sales Tax Registration Actually Includes
Bold takeaway: We register, you don’t. No software for you to learn, no portal logins to manage, no “DIY checklist” disguised as a service.
EIN procurement (if you don’t have one)
We file IRS Form SS-4 by fax for foreign-applicant entities with no responsible-party SSN/ITIN. Faxed Form SS-4 applications, including from international applicants, are generally processed by the IRS within about four business days (see IRS Instructions for Form SS-4). We track the fax, deliver the CP 575 letter, and roll the EIN into the state registrations.
Nexus study to determine which states you must register in
Before we register a single state, we run a nexus study. We pull:
– 24 months of sales-by-state data (from Shopify, Amazon, Etsy, your own systems)
– Amazon FBA Inventory Event Detail report (every warehouse your stock has touched)
– Channel mix (marketplace vs. direct)
– Product taxability per state (food, supplements, SaaS, apparel, etc.)
The output is a one-page matrix: state, nexus type (physical/economic/both), trigger date, recommended registration date, expected filing frequency. You see every state we recommend and every state we recommend skipping (and why).
Application preparation and submission per state
We prepare and file each state application ourselves. You don’t open the DOR portal. We use either the state’s online registration system, the Streamlined Sales Tax Registration System (SSTRS) for the 24 SST member states, or paper applications where a foreign applicant needs that path.
Login credential delivery and password vault
When the state issues your permit, we receive the login credentials, document them in a secure encrypted vault, and hand them to you. You own the credentials. If you ever leave us, you walk out with full access — no lock-in.
Filing frequency setup and calendar
States assign filing frequency (monthly / quarterly / annual) based on expected liability. We register at the right frequency to minimize over-reporting cost. California assigns sales tax filing frequency based on taxable sales per month rather than tax liability, and accounts exceeding $17,000 in taxable sales per month are placed on quarterly prepayment (see CDTFA Compliance Policy Manual Ch. 3). Connecticut typically assigns annual filing frequency to marketplace-only sellers — a low ongoing-burden setup.
We deliver a 12-month filing calendar showing every due date, every state, every form. You see at a glance what’s coming.
Ongoing optional filing service handoff
Registration is the start. From there you can either:
1. Roll into our monthly filing service — we file every return, every state, every month, for one fee.
2. Hand the calendar to your existing bookkeeper.
3. Self-file via the credentials we delivered.
Most foreign-seller clients pick option 1. The whole point of hiring a service is not to learn 45 state portals.
Economic Nexus Thresholds Foreign Sellers Must Watch (2026)
Bold takeaway: $100K is the most common threshold, but California, Texas, and New York sit at $500K — and the transaction-count prong has been quietly dropped by most states since 2019.
The standard thresholds: $100K, $250K, $500K
Most states use $100,000 in gross receipts (or sometimes taxable receipts) as the economic-nexus trigger, measured over the prior or current calendar year. A handful of larger states use higher thresholds:
| State | Sales-dollar threshold | Transactions | Conjunctive (AND) or single (OR)? |
|---|---|---|---|
| California | $500,000 | none | Single (dollar only) |
| New York | Economic nexus thresholds vary by state and have been revised repeatedly since Wayfair. If you need to confirm the current sales threshold for a specific state, contact us for a current review. | 100 transactions | Some states use a conjunctive sales-and-transactions threshold while others use a single-prong test, and several have changed their formulation in recent years. If you are evaluating a specific state’s economic nexus test, contact us for a current review. |
| Connecticut | Most economic nexus thresholds cluster around a sales-based dollar figure, but the exact amount and measurement period differ by state. If you need the current threshold for your target states, contact us for a current review. | 200 transactions | Whether a state’s economic nexus test requires crossing both a sales and a transaction threshold — or only one — depends on the specific state and recent legislative changes. If you are sizing up multi-state exposure, contact us for a current review. |
| Kansas | Economic nexus sales thresholds vary by state and are subject to legislative change. If you need the current threshold for a particular state, contact us for a current review. | none | Single (dollar only) |
| Pennsylvania | $100,000 | none | Single (dollar only) |
Transaction-count thresholds (and which states dropped them)
Many states originally adopted “$100K OR 200 transactions” — copying South Dakota’s Wayfair statute. After Wayfair, most states realized 200 transactions captured low-revenue casual sellers and started dropping the count prong. Today, the count prong remains in only a minority of states, and where it does it’s usually conjunctive (AND), not single (OR).
For a foreign seller, the conjunctive states (NY, CT) are friendlier — you need both prongs to cross, so a high-AOV seller with under 100 transactions in NY can stay below nexus indefinitely.
States with no nexus de minimis
A few states have at various points argued they have no de minimis threshold for remote sellers. Kansas, prior to 2021 SB 50 effective 2021-07-01, had no economic nexus threshold and asserted that all remote sellers had to register. Kansas now has a $100,000 cumulative gross receipts threshold per 2021 SB 50.
For the current 2026 threshold for any state not listed above, see our economic nexus thresholds by state reference, or contact us for a current review tied to your sales data.
Amazon FBA Foreign Seller Special Case
Bold takeaway: FBA inventory triggers physical-presence nexus the day Amazon ships your stock to a state — and several states require you to register even when Amazon collects 100% of the marketplace sales tax.
Inventory in an FBA warehouse = physical nexus
When you opt into Amazon FBA, you authorize Amazon to redistribute your inventory across its US fulfillment network. Amazon makes that decision algorithmically based on demand forecasting, not your tax planning. A pallet you sent to a California cross-dock can land in 12 states inside two weeks.
Each state where your inventory rests creates its own nexus question. Most states’ physical-presence statutes pre-date Wayfair and capture “owning, leasing, or storing tangible personal property” in the state. FBA stock is your tangible personal property, stored for sale. The fact that Amazon (not you) operates the warehouse doesn’t change the analysis.
Which FBA warehouse states still require registration despite MF laws
This is the question every a SaaS sales tax platform/a SaaS sales tax platform competitor blog skims over. Marketplace facilitator laws shift the collection and remittance obligation to the marketplace, but they don’t always shift the registration obligation. Several states have explicit positions that an FBA seller with in-state inventory must still register:
- California: The CDTFA Tax Guide for the Marketplace Facilitator Act states that the marketplace-only registration relief in R&TC §6042 does not apply when the seller has independent physical-presence nexus from FBA inventory. Register required.
- New York: New York’s guidance addresses whether marketplace sellers must obtain a Certificate of Authority even when the marketplace collects tax, and the answer depends on the seller’s specific activities. If you sell into New York through a marketplace, contact us for a current review. Register required.
- Pennsylvania: Pennsylvania requires marketplace facilitators and online sellers with sufficient economic presence in the state to register, collect, and remit sales tax, with the specific threshold and mechanics set by PA DOR guidance. If you are evaluating PA registration obligations, contact us for a current review. PA does not exempt MF-only sellers from registration.
- Connecticut: Per CT DRS bulletin OCG-8, marketplace sellers select an MF-only checkbox on Form REG-1 and are assigned an annual filing frequency. MF assumes liability but seller registration is still required for tracking.
Other states (Kansas, for example) take a more relaxed view. KDOR Notice 21-24 states that the specific provisions of 2021 SB 50 supersede traditional registration requirements for facilitated sales — Kansas’s position is that MF collects on facilitated sales and direct seller registration for those sales isn’t required.
The pattern: the rules differ state by state, and your channel mix matters. A foreign FBA-only seller with no Shopify or direct sales has different obligations than the same seller running a Shopify store alongside Amazon.
How we pull your Amazon FBA inventory report and map it to states
During onboarding, we ask for read-only access to (or a one-time CSV export of) your Amazon Seller Central Inventory Event Detail report. We process it to identify every state your stock has touched in the last 24 months and overlay each state’s MF and registration position. The output is a clear yes/no per state, with the rationale documented so it survives audit defense later.
For more detail, see our Amazon FBA sales tax guide for foreign sellers.
Pricing: What a Foreign-Seller Registration Engagement Costs
Bold takeaway: Flat fee per state, paid once. EIN procurement included for first-time clients. No per-transaction or revenue-based pricing.
Our flat per-state fee
We charge a single flat fee per state registration. The fee covers the nexus determination for that state, the application preparation and submission, login credential delivery, and the filing-frequency setup. No hourly billing, no surprise add-ons, no “configuration fee.”
For specific 2026 pricing tied to your number of states and channel mix, see our pricing page or book a free consultation.
What’s included vs add-ons
Included:
– EIN procurement via SS-4 (first-time foreign clients)
– Nexus study covering all 45 sales-tax states
– State applications submitted on your behalf
– Login credentials delivered in a secure vault
– 12-month filing calendar
– 30 days of post-registration support per state
Available as add-ons:
– Ongoing monthly filing service
– Voluntary disclosure agreement (VDA) service for back-period exposure
– Local-jurisdiction filings (home-rule cities in Colorado, Alaska, etc.)
– Audit defense if a state opens a review
Comparison: software-only vs CPA hourly vs done-for-you service
| Approach | Who does the work? | Foreign-seller fit? | Total cost (typical) |
|---|---|---|---|
| the major SaaS sales tax platforms / a SaaS sales tax platform software | You | Poor — assumes EIN, US bank, SSN | Subscription + your time |
| Boutique CPA hourly | CPA, but billed per hour | Variable — many decline non-US | High and unpredictable |
| Sales Tax Compliance USA | Us, end-to-end | Built for non-US founders | Flat fee per state |
The economics shift with cross-border complexity. A CPA who charges $300/hour and has never registered a foreign entity in California will spend three times as long figuring out the responsible-officer workaround as we will. We’ve done it hundreds of times.
How to Start: Onboarding Steps for a Foreign Seller
Bold takeaway: From your first call to your first state being live: typically 2-3 weeks. EIN-required engagements add 4-6 weeks if you don’t already have an EIN.
Step 1: 30-minute discovery call
You book a free consultation. We talk through your channels (Amazon, Shopify, Etsy, direct), your sales volume by state, your FBA inventory exposure, and your existing US footprint (LLC or no LLC, EIN or no EIN, US bank or no US bank). At the end of the call, we send you a written scope and quote.
Step 2: We send a secure intake questionnaire
If you accept the quote, we send a secure intake form covering:
– Entity name, country of formation, registration documents
– Officer/owner details (passport, foreign tax ID)
– 24 months of sales data (CSV exports from each channel)
– Amazon FBA Inventory Event Detail report
– Existing EIN letter (if any) or authorization to obtain one
– Banking situation
Step 3: Nexus determination report
Within 5 business days of receiving the intake, we deliver a nexus determination report — the per-state matrix described earlier. You approve the state list before we file anything.
Step 4: Registrations submitted within 5 business days
Once you approve the list, we begin submissions. Online-portal states typically register within California Seller’s Permit applications submitted online through CDTFA are generally processed reasonably quickly, but actual turnaround depends on application completeness and current CDTFA workload. If you need a California Seller’s Permit on a deadline, contact us for a current review.; other states vary from same-day to 4 weeks. Paper-only foreign-applicant tracks add another 2-4 weeks.
If you don’t already have an EIN, we file SS-4 on day one and run state registrations in parallel for the states that don’t require EIN at submission. EIN-dependent states queue until the IRS issues the number.
Frequently Asked Questions
Do I need a US LLC before registering for sales tax as a foreign seller?
No, in most cases. Most state DORs accept a foreign entity (e.g., a UK Ltd, an Australian Pty Ltd, a German GmbH) directly. A US LLC can simplify banking and federal income tax positioning but isn’t a sales-tax prerequisite. We’ll tell you on the discovery call whether your specific situation benefits from forming a US entity first.
Can I register for US sales tax without an SSN or ITIN?
Yes. Most states allow registration using the entity’s EIN as the primary tax identifier. A small number of states require an SSN or ITIN in the responsible-officer field; for those we use known workarounds (foreign passport number, registered agent solutions, paper applications with explanatory cover). Contact us for a current state-by-state status before relying on this.
How do I get an EIN as a non-US founder with no Social Security Number?
File IRS Form SS-4 by fax or mail with “Foreign” written in the responsible party’s SSN/ITIN field. The IRS issues EINs to foreign applicants regularly. Standard turnaround is typically 4-6 weeks. We file SS-4 for you as part of the registration engagement at no extra cost for first-time clients. See our dedicated guide: EIN for non-US founders.
Does Amazon FBA inventory trigger sales tax registration if I’m based outside the US?
Yes, in most states where your inventory rests. FBA inventory is your tangible personal property stored for sale, which most states’ physical-presence statutes capture regardless of your citizenship or location. California, New York, Pennsylvania, and Connecticut all explicitly require FBA sellers to register even when Amazon collects all marketplace sales tax. See Amazon FBA sales tax for foreign sellers.
Which US states are hardest for foreign sellers to register in?
California is operationally the most complex (modified-origin sourcing, district taxes, Seller’s Permit application with detailed officer disclosures). Pennsylvania is rigid on registration timing. New York requires a Certificate of Authority and Web File credentials with two-factor on a US phone in some setups. Washington requires bonding for some out-of-state sellers. Connecticut requires zero-return filing even with no sales. We’ve registered foreign clients in all of them — the difficulty is in the workaround knowledge, which we have.
Do I need a US bank account to file and pay US sales tax?
Not always. Many states accept credit card payments (with a convenience fee), and a growing number accept ACH from non-US-domiciled US-routing-number accounts (Wise, Mercury, Payoneer, Relay). A few high-volume states mandate ACH from a US bank account once you cross thresholds. We help you select the right banking option.
How long does sales tax registration take for a foreign seller?
Typical end-to-end timeline: 2-3 weeks per state for clients who already have an EIN. Add 4-6 weeks if EIN is needed. State portal processing varies — some issue permits same-day, others take 2-4 weeks.
What happens if I’m a foreign seller who has been selling for years without registering?
You may have meaningful back-period exposure. The fix is usually a Voluntary Disclosure Agreement (VDA), which limits the lookback period (typically 3 years), waives most penalties, and reduces interest. The VDA must be filed before the state contacts you. See our voluntary disclosure agreement service.
Do marketplace facilitator laws mean I don’t need to register at all?
No — that’s the most common misconception we see. MF laws shift collection to the marketplace for facilitated sales, but several states still require the seller to register and file, especially where the seller has FBA inventory. And MF laws never cover your direct-channel sales (Shopify, your own website, wholesale). See marketplace facilitator laws by state.
Can you handle the whole compliance process — registration, filings, and notices — for me?
Yes. That’s the entire point of the service. Registration, filings, remittance, notice handling, and audit defense — done by us, paid for in a single fee. Software vendors hand you a tool and say “do it yourself.” We do it.
Don’t Want to Figure This Out Yourself?
Sales Tax Compliance USA handles your entire US sales tax compliance — registration through filing — for a single flat fee. Built specifically for foreign sellers without an EIN, US bank account, or US address.
Book a free consultation or learn more about what’s included in our service.
Last verified: 2026-05-10
This article is for informational purposes only and does not constitute tax advice. Consult a licensed tax professional before acting on any of this content.
