US Tax Compliance for Foreign E-Commerce Sellers 2026

Foreign-based sellers shipping goods or delivering services to US customers face the same state sales tax rules as US-based sellers once their sales cross nexus thresholds. In addition, they must navigate federal customs and import duty obligations, US entity formation considerations, and IRS reporting requirements that do not apply to domestic sellers.

This checklist covers all tax-related compliance layers for non-US sellers selling into the US as of June 2026. It does not address shipping logistics, store setup, or marketing. For general sales tax mechanics shared with domestic sellers, see the US Sales Tax Compliance Checklist for US-Based Sellers. For state-level thresholds, see the State Sales Tax Index.

Step 1: Determine If You Have US Sales Tax Nexus

The South Dakota v. Wayfair (2018) ruling applies globally. Foreign-based sellers are subject to the same economic nexus rules as US-based sellers — no physical US presence required.

1a. Economic Nexus Thresholds

Pattern	States	Threshold
Common rule	Most states + DC + Puerto Rico	$100,000 in sales or 200 transactions in current or previous calendar year
Sales-only (transaction threshold eliminated)	Alaska (eff. Jan 1, 2025), Utah (eff. Jul 1, 2025), Illinois (eff. Jan 1, 2026)	$100,000 in sales only
High revenue threshold	California	$500,000 gross sales of tangible personal property
High revenue threshold	Texas	$500,000 gross revenue
High revenue threshold + transaction count	New York	$500,000 gross receipts and 100 transactions (previous four sales tax quarters)
Mid-level revenue threshold	Alabama	$250,000 retail sales (marketplace-facilitated sales often excluded from seller’s threshold)
Mid-level revenue threshold	Mississippi	$250,000 in sales
Dual condition (AND)	Connecticut	$100,000 and 200 transactions in the 12-month period ending September 30
No state sales tax	Alaska*, Delaware, Montana, New Hampshire, Oregon	No state-level obligation (*Alaska has local jurisdiction taxes via ARSSTC)

1b. Physical Nexus — Foreign Sellers Are Not Exempt

Physical nexus applies regardless of where your business is incorporated:

Amazon FBA: If Amazon stores your inventory in US warehouses, you have physical nexus in those states from dollar one — no revenue threshold applies. See Amazon FBA Sales Tax: Physical Nexus Trap Explained.
Third-party logistics (3PLs): Same rule — inventory in any US warehouse creates physical nexus in that state
US employees or contractors: Any person working on your behalf in a US state creates physical nexus there
US office or pop-up presence: Any fixed or temporary place of business triggers nexus

1c. Marketplace Facilitator Relief

If you sell exclusively through marketplaces (Amazon, Etsy, eBay, Walmart Marketplace), those platforms act as marketplace facilitators in nearly all applicable US states and collect and remit sales tax on your behalf. However:

Marketplace-facilitated sales may still count toward your economic nexus threshold for your own direct-channel sales in some states
Physical nexus from FBA inventory is not eliminated by marketplace facilitator status — Amazon collects for Amazon sales, but you must collect for your own-store sales into those same FBA states
If you also sell direct (your own website, Shopify store, Stripe billing), those sales are your full responsibility regardless of marketplace status

1d. Ongoing Nexus Monitoring

Monitor total US sales per state monthly across all channels
Use tax software with cross-channel nexus tracking and automated alerts
Set alerts at 80% of each state’s threshold — registration takes time and must occur before you begin collecting

Step 2: Obtain a US EIN — Required Before Anything Else

An Employer Identification Number (EIN) is a federal tax identifier issued by the IRS. Most US states require it for sales tax permit registration. It is separate from and does not replace a sales tax permit.

Apply by phone (fastest for foreign entities without a US SSN): Call the IRS Business and Specialty Tax Line at +1 (267) 941-1099, Monday–Friday 6am–11pm ET. Have your business details ready; EIN is issued in the same call.
Apply by fax: Complete IRS Form SS-4 and fax to +1 (855) 215-1627. Allow 4–6 business days.
Apply by mail: Send Form SS-4 to the IRS. Allow 4–6 weeks.
The online EIN application is available only to entities with a US SSN or ITIN — foreign entities without a US TIN must use phone, fax, or mail
Retain your EIN confirmation letter (CP575) — it will be required repeatedly for state registrations and banking

Step 3: Register for Sales Tax Permits

3a. Streamlined Sales Tax (SST) Registration

Foreign sellers may register via the SST programme, which covers 23 full member states in a single application.

SST Full Member States (23): Arkansas, Georgia, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Nebraska, Nevada, New Jersey, North Carolina, North Dakota, Ohio, Oklahoma, Rhode Island, South Dakota, Utah, Vermont, Washington, West Virginia, Wisconsin, Wyoming. Tennessee is an associate member.

Register at sstregister.org using your EIN and foreign business address
Consider engaging a Certified Service Provider (CSP) — SST CSPs (Avalara, TaxJar, TaxCloud) handle calculation, filing, and remittance in SST states; foreign sellers can use them without a US entity

3b. Individual State Registration

For non-SST states, register with each state’s Department of Revenue directly.

Address requirement: Many state portals expect a US address. Options:
- Use a US registered agent service ($50–200/year per state) — provides a US address and accepts official correspondence
- Some states accept foreign addresses directly — verify on each state’s portal
Required information per state: EIN, legal business name, country of incorporation, business type, principal address, description of goods/services, estimated annual US revenue
Keep all permit numbers — needed for returns and in some states for invoices

3c. Local Jurisdiction Registration

Colorado Home Rule cities (~70+ independent tax jurisdictions): Register and file directly with each applicable city if you have Colorado sales
Alaska ARSSTC: Register via the Alaska Remote Seller Sales Tax Commission for local jurisdiction compliance if selling into Alaska
Most other states: state registration covers all local taxes through a single return

Step 4: US Entity Formation — Options and Obligations

A US entity is not required for sales tax compliance — foreign entities can register for sales tax permits using a foreign address and an EIN. However, many foreign sellers form a US entity for payment processing, banking, and contracting purposes. Each option carries distinct obligations.

4a. Option: Operate as a Foreign Entity with US Registration

Obtain an EIN (see Step 2)
Use a US registered agent for official correspondence in each state where required
Register as a foreign qualified entity only if you have a physical presence requiring it — pure economic nexus generally does not require qualification as a foreign entity in most states
No US federal income tax filing required unless you have Effectively Connected Income (see Step 7)

4b. Option: Form a US LLC or C-Corporation

Many foreign sellers form a Delaware or Wyoming LLC to access Stripe, US bank accounts, and simplified contracting.

What a US LLC does:

Provides a US business entity for payment processor acceptance
Simplifies contracting with US customers and vendors
Enables US business banking

What a US LLC does NOT do:

It does not eliminate your foreign-country tax obligations
It does not automatically exempt you from IRS reporting requirements — it triggers new ones

Critical IRS obligation for single-member US LLCs owned by non-US persons:

A single-member US LLC owned entirely by a non-US person or entity is a Foreign-Owned Disregarded Entity (FODE). This triggers mandatory annual filing of IRS Form 5472 attached to a pro forma Form 1120.

File Form 5472 annually — deadline April 15 (or October 15 with Form 7004 extension)
Report all transactions between you (the foreign owner) and the LLC: capital contributions, distributions, loans, service payments, property transfers
Penalty for failure to file: $25,000 per violation per year — enforced aggressively by the IRS since 2017
This is a federal IRS requirement entirely separate from state sales tax — being registered for state sales tax does not satisfy it

See IRS Form 5472 for Foreign-Owned US LLCs for the full detail.

4c. Compliance Partner and Fiscal Representative Services

Some foreign sellers use a US-based compliance partner or fiscal representative to handle registrations, correspondence, and filing on their behalf
Sales tax permits are state-level — a fiscal representative arrangement does not substitute for per-state registration, but a compliance firm can handle the registration process
Compliance firms (Avalara, Taxually, and others) offer registration services as an add-on to software subscriptions

Step 5: Federal Customs, Import Duties & Tariffs

Customs duties are federal obligations entirely separate from state sales tax. They apply when you ship physical goods from outside the US into the US — either directly to customers or into a US warehouse (FBA or 3PL).

Customs duty and sales tax are independent. Owing one does not affect the other. Both can apply to the same shipment.

5a. The De Minimis Rule — Major 2026 Change

Effective August 29, 2025 (and continuing in 2026), the duty-free de minimis treatment for commercial shipments valued at $800 or less has been suspended for all countries.

Low-value e-commerce parcels no longer qualify for automatic duty-free entry. All such shipments are now subject to:

Applicable customs duties based on HTS code and country of origin
Applicable taxes and fees
Formal or simplified entry processing via CBP’s Automated Commercial Environment (ACE)

Postal shipments may be subject to transitional flat-fee processes — verify current postal treatment with your carrier.

Do not assume small-value shipments (under $800) are duty-free — this exemption no longer applies
Account for customs duty in your landed cost and pricing for all US-bound shipments
Determine your product’s HTS (Harmonized Tariff Schedule) code and the applicable duty rate — use CBP’s online HTS database or a licensed customs broker
Build duty costs into your pricing or display them transparently at checkout (DDP — Delivered Duty Paid) to avoid surprise charges on delivery

5b. Additional Tariffs — China-Origin Goods

If your goods originate in China, additional tariffs apply on top of standard duties:

Section 301 tariffs: Base rates of 7.5–25% on most goods; escalated to 25–100% on strategic categories including EVs, batteries, solar panels, steel, aluminum, and semiconductors (phased in through 2024–2026). Some exclusions have been extended selectively but many have expired.
Section 232 tariffs: Apply to steel and aluminum products from most countries
Identify your goods’ country of origin (not just country of shipment — rules of origin apply)
Check Section 301 tariff lists maintained by USTR (ustr.gov) for your HTS codes
Verify whether any exclusions apply to your specific HTS code

5c. Importer of Record (IOR) Responsibility

The Importer of Record is legally responsible for accurate entry filing, duty payment, and customs compliance. This is typically the seller or a designated US party.

Designate your IOR role — either your US entity, a US customs broker acting on your behalf, or in some cases a fulfilment partner (verify their terms)
Prepare accurate commercial invoices and packing lists for every shipment: seller and buyer details, full description of goods, quantity, unit value, country of origin, HTS code
Amazon FBA foreign sellers: Amazon handles logistics after goods arrive in the US, but you remain responsible for import compliance and duty payment — Amazon does not act as your IOR by default
Licensed customs broker strongly recommended for most e-commerce importers post-de minimis suspension — brokers file entries, calculate duties, and manage compliance on your behalf

5d. DDP vs. DAP — Customer Experience

DDP (Delivered Duty Paid): You pre-pay all duties; customer receives goods with no surprise charges at delivery. Better customer experience; higher landed cost.
DAP (Delivered at Place): Customer pays duties on delivery. High rates of package refusal, chargebacks, and negative reviews.
For goods shipped directly to US customers, use DDP if possible — configure your checkout to collect estimated duties or absorb them into pricing
Major carriers offering DDP services: DHL Express, FedEx International, UPS Worldwide

5e. Additional Compliance Requirements

UFLPA (Uyghur Forced Labor Prevention Act): Goods made in Xinjiang, China, or by named entities on the UFLPA Entity List are subject to a rebuttable presumption of forced labor and may be detained at the border. Applies regardless of declared value.
Product-specific regulations: Depending on your product category, additional compliance may be required (FDA for food/cosmetics/medical, CPSC for children’s products, USDA for agricultural goods)
Use CBP.gov and ACE for entry filing and compliance information

Step 6: Sales Tax — Collection, Filing & Remittance

Once registered, your sales tax collection and filing obligations are identical to those of a US-based seller. The following summarises the key actions; for full detail see the US Seller Compliance Checklist.

6a. Platform Configuration

Channel	Who Collects Tax	Your Action
Amazon Marketplace (FBA/FBM)	Amazon (marketplace facilitator)	Monitor physical nexus from FBA inventory; ensure accurate product taxability data
Etsy / eBay / Walmart Marketplace	Platform (marketplace facilitator)	Monitor aggregate cross-channel nexus thresholds
Your own Shopify / WooCommerce store	You	Configure tax collection in nexus states; integrate filing software
Stripe billing / direct payments	You	Enable Stripe Tax or integrate Anrok/Quaderno; note Stripe Tax tracks Stripe-only revenue
Lemon Squeezy / Paddle / Payhip	Platform (Merchant of Record)	Nothing — platform handles all US sales tax

6b. Tax Software — Foreign Seller Recommendations

Software	Best For
Avalara	High-volume multi-state sellers; offers registration services for foreign entities; strong Amazon and Shopify integrations; SST CSP
TaxJar	E-commerce SMBs; easy AutoFile; good for sellers primarily on Shopify, Amazon, or Etsy
Anrok	SaaS and digital product sellers; multi-processor nexus tracking; handles US sales tax and EU VAT in one tool
Quaderno	International sellers with EU + US obligations; multi-channel (Shopify + Stripe + PayPal); automatic invoicing
TaxCloud	Affordable option with SST CSP status; good for straightforward physical goods e-commerce
Stripe Tax	Stripe-native sellers with simple product mix — but tracks nexus on Stripe revenue only; see Stripe Tax for SaaS & Digital Goods

6c. Filing Checklist

File periodic returns in every registered state — frequency assigned by each state (monthly, quarterly, or annual)
File zero returns in registered states even in periods with no taxable sales
Due dates typically around the 20th of the following month — verify each state’s exact deadline
Remit tax collected to each state on schedule
Retain transaction records, returns, and exemption certificates for 3–7+ years per state
For B2B sales to US businesses, collect and retain valid resale or exemption certificates before zero-rating transactions

Step 7: Federal Income Tax Considerations

This section is high-level only. Consult a US international tax advisor for your specific situation.

Effectively Connected Income (ECI): If your business activities in the US rise to the level of a US trade or business — which may include operating a US warehouse, having employees or agents in the US, or other factors — your US-sourced income may be Effectively Connected Income (ECI) subject to US federal income tax.

Foreign corporations with ECI must file Form 1120-F (US Income Tax Return of a Foreign Corporation)
Individuals with ECI may need to file Form 1040-NR
Tax treaties between the US and your home country may reduce or eliminate this obligation — verify applicability

Form 5472: If you form a US LLC owned entirely by a non-US person, annual Form 5472 filing is required. See Step 4b above and the dedicated guide: IRS Form 5472 for Foreign-Owned US LLCs.

FIRPTA: Applies if you sell US real property interests — generally not relevant for e-commerce sellers.

1099-K reporting: US payment processors issue Form 1099-K for accounts exceeding reporting thresholds. This does not create a tax obligation by itself but may trigger IRS matching if not reconciled correctly.

Step 8: Recommended Compliance Stack for Foreign Sellers

Layer	What It Covers	Who to Use
Sales tax software	Nexus monitoring, rate calculation, exemption certificates, return filing, remittance	Avalara, TaxJar, TaxCloud, Anrok, Quaderno (based on channel mix and volume)
US registered agent	US address for state registrations and official correspondence	Northwest Registered Agent, Incfile, CT Corporation ($50–200/year per state)
Licensed customs broker	Import entry filing, duty calculation, HTS classification, ACE compliance	DHL Trade Services, CHB Customs, local licensed brokers — required post-de minimis suspension
US entity (optional)	Payment processor access, US banking, contracting	Delaware or Wyoming LLC via Stripe Atlas, Firstbase, or attorney — triggers Form 5472 obligation
International tax advisor	Form 5472, ECI analysis, tax treaty review, Form 1120-F if required	US CPA or enrolled agent with international tax specialisation
Sales tax specialist (optional)	Multi-state registration setup, VDA negotiations, audit response	Sales tax CPA or compliance firm (Avalara Professional Services, Taxually, etc.)

Verification & Professional Advice

This checklist reflects rules as of June 2026. US sales tax laws, customs regulations, tariff schedules, and IRS reporting requirements change frequently and can change with limited notice. This is a factual guide, not legal or tax advice.

For your specific situation:

Verify sales tax thresholds and product taxability with each state’s Department of Revenue or via SSTGB.org
Verify current customs duties, tariff rates, and de minimis treatment with CBP.gov and USTR.gov
Consult a licensed US customs broker for import compliance
Consult a US-qualified international tax advisor for ECI analysis, Form 5472 obligations, and treaty review

Non-compliance risks: back taxes, penalties, interest, duty assessments, shipment seizures, CBP holds, IRS penalty assessments, and potential loss of US market access.