UK businesses using Amazon FBA in the United States often trigger U.S. tax exposure under domestic law due to inventory held in American warehouses.
However, the UK–U.S. income tax treaty frequently eliminates U.S. federal income tax where activities are limited solely to storage and fulfilment.
That said:
- Protective U.S. filings are still strongly recommended
- State taxes and sales tax obligations often apply regardless
- Any U.S. activity beyond logistics can create a Permanent Establishment (PE)
This guide explains the position as it stands in 2025, with practical compliance guidance for UK sellers.
Table of Contents
1. Why Amazon FBA Creates U.S. Tax Questions for UK Sellers
The U.S. remains one of the most attractive ecommerce markets globally due to:
- High consumer spending
- Mature logistics infrastructure
- Frictionless access via Amazon FBA
Under Fulfilled by Amazon (FBA), UK sellers store inventory in U.S. warehouses while Amazon handles picking, packing, delivery, and customer service.
While operationally efficient, this model creates complex U.S. tax questions, including:
- Does inventory in U.S. warehouses create a Permanent Establishment (PE)?
- Are U.S. federal income tax returns required?
- How does the UK–U.S. income tax treaty apply?
- What about U.S. state taxes and sales tax?
2. U.S. Domestic Law: U.S. Trade or Business (USTB) & ECI
2.1 The USTB threshold
Under U.S. domestic tax law, a foreign business may be subject to U.S. federal income tax if it is:
- Engaged in a U.S. trade or business (USTB), and
- Earns Effectively Connected Income (ECI)
U.S. courts describe a USTB as activity that is:
“considerable, continuous, and regular.”
2.2 Why Amazon FBA often meets this test
For Amazon FBA sellers:
- Inventory is physically located in the U.S.
- Stock is replenished continuously
- Sales are fulfilled domestically
As a result, inventory held in U.S. warehouses commonly satisfies the asset-use test for ECI, meaning many UK sellers meet the domestic threshold for U.S. taxation — even with no U.S. staff or offices.
⚠️ Important: Domestic law is only the starting point.
3. The UK–U.S. Tax Treaty: The “Permanent Establishment Filter”
The UK–U.S. income tax treaty can override U.S. domestic law.
3.1 Article 7 – Business Profits
Under Article 7:
The U.S. may tax the business profits of a UK enterprise only if those profits are attributable to a Permanent Establishment in the United States.
If no PE exists, taxing rights remain exclusively with the UK.
3.2 Why this matters for FBA sellers
This means:
- You can have a USTB under domestic law
- Yet still owe no U.S. federal income tax if treaty protection applies
The treaty acts as a filter, blocking U.S. taxation where activities fall within specific exceptions.
4. When Amazon Warehousing Does Not Create a Permanent Establishment
4.1 Article 5(4): The Warehousing Exception
Article 5(4) explicitly excludes certain activities from creating a PE, including:
- Use of facilities solely for storage, display, or delivery of goods
- Maintenance of inventory solely for storage, display, or delivery
- Fixed places of business used solely for preparatory or auxiliary activities
4.2 HMRC’s position
HMRC guidance confirms that:
- Storage, display, and delivery activities are excluded from PE status
- This applies even if those activities are substantial
- The exception applies regardless of whether they are preparatory or auxiliary in nature
4.3 Application to Amazon FBA
Accordingly:
- Inventory stored and shipped by Amazon FBA or a third-party logistics provider (3PL) does not in itself create a PE
- Amazon is generally treated as an independent agent
- Standard fulfilment activities alone do not establish a PE for the seller
5. The Importance of “Solely” & the Preparatory or Auxiliary Test
The warehousing exception is not automatic.
5.1 Why “solely” matters
Article 5(4) requires that U.S. activities be limited exclusively to the listed functions.
Once activities move beyond logistics and into core profit-generating functions, treaty protection can fail.
5.2 Low-risk structures (where treaty protection is strongest)
Treaty protection is more robust where:
- Pricing authority remains outside the U.S.
Pricing is a core commercial function. If pricing decisions are made in the UK and merely executed automatically via Amazon, risk is reduced. - Strategic and operational decisions occur in the UK
Inventory levels, returns policies, quality control, and supplier negotiations are handled outside the U.S. - Amazon acts as an independent agent
Amazon fulfils orders in the ordinary course of its business and has no authority to negotiate or conclude contracts on the seller’s behalf.
5.3 When the exception may fail
Risk increases where U.S. activities include:
- Discretionary inventory management
- Returns handling involving judgment calls
- Customer-facing services
- Marketing or advertising decisions
- U.S.-based staff or agents with commercial authority
6. When Permanent Establishment Risk Increases
A PE may arise if the seller has:
- A fixed place of business in the U.S. through which business is carried on, or
- A dependent agent in the U.S. who habitually concludes contracts
Additional risk factors include:
- Anti-fragmentation rules (Article 5(4.1)) preventing artificial splitting of activities
- Closely related enterprises performing complementary functions
- Substantive U.S. operational involvement
7. Why Protective U.S. Tax Filings Are Still Essential
Even where treaty protection applies, non-filing is risky.
Many advisers recommend filing:
- Form 1120-F (companies) or Form 1040-NR (individuals)
- Form 8833 to disclose the treaty position
Benefits of protective filing:
- Starts the statute of limitations
- Preserves deductions
- Avoids gross-income taxation if the IRS later challenges the treaty claim
8. U.S. State Taxes & Sales Tax Obligations
The UK–U.S. treaty applies only to federal income tax.
8.1 State tax exposure
U.S. states may impose:
- Income taxes
- Franchise taxes
- Gross receipts taxes
Inventory stored in a state through Amazon FBA typically creates physical nexus, triggering:
- Sales tax registration and collection
- Potential state income or franchise tax filings
⚠️ Treaty protection does not override state tax law.
9. Double Taxation & Foreign Tax Credits
9.1 Treaty relief
Where U.S. tax is properly imposed:
- Article 24 requires the UK to grant a foreign tax credit
- The credit is limited to the UK tax on the same profits
9.2 Practical compliance
To access treaty relief:
- U.S. returns must generally be filed
- Form 8833 should explain the treaty position
- Failure to file can result in loss of deductions
10. Compliance Checklist for UK Amazon FBA Sellers
To manage risk and preserve treaty protection:
✔ Restrict U.S. activities to storage and fulfilment
✔ Keep pricing, marketing, and strategy outside the U.S.
✔ Avoid U.S. dependent agents
✔ File protective U.S. federal tax returns
✔ Register for sales tax where inventory is stored
✔ Assess state income and franchise tax exposure
✔ Maintain robust documentation (Amazon contracts, internal decision records)
✔ Obtain specialist advice rules evolve and facts matter
11. Key Takeaways
- Warehousing alone does not create a U.S. PE where activities are limited to storage, display, or delivery
- The word “solely” is critical
- Treaty protection can eliminate federal income tax but not filing obligations
- State taxes often apply independently
- Professional advice is essential for fact-specific analysis
Final Thoughts
Amazon FBA continues to provide UK businesses with scalable access to the U.S. market.
By carefully separating UK-based commercial decision-making from U.S. logistics, sellers can significantly reduce tax risk while expanding internationally.
Given the complexity and evolving nature of U.S. and international tax law, tailored professional advice remains essential.
Frequently Asked Questions (FAQs): Amazon FBA U.S. Taxes for UK Sellers
Do UK Amazon FBA sellers have to pay U.S. federal income tax?
Not always.
While holding inventory in U.S. Amazon warehouses often creates a U.S. trade or business (USTB) under domestic law, the UK–U.S. income tax treaty can eliminate U.S. federal income tax where the seller does not have a Permanent Establishment (PE) in the United States.
If treaty protection applies, profits are taxable only in the UK but U.S. filing obligations may still exist.
Does storing inventory in Amazon U.S. warehouses create a Permanent Establishment?
Inventory storage alone does not create a U.S. Permanent Establishment, provided activities are limited solely to storage, display, or delivery of goods.
Article 5(4) of the UK–U.S. tax treaty explicitly excludes these activities from PE status, and HMRC guidance confirms this interpretation.
However, treaty protection can be lost if U.S. activities extend beyond logistics into core commercial decision-making.
Is Amazon considered a dependent agent for UK sellers?
In most cases, no.
Amazon is typically treated as an independent agent acting in the ordinary course of its business. Amazon fulfils orders and provides logistics services but does not usually have authority to negotiate or conclude contracts on behalf of sellers.
A dependent-agent PE risk may arise only if a U.S. person habitually exercises contract-concluding authority for the seller.
Why is the word “solely” so important in the treaty?
The warehousing exception applies only where U.S. activities are exclusively limited to storage, display, or delivery.
If any additional activities are performed in the U.S. such as pricing decisions, inventory strategy, discretionary returns handling, or customer engagement — the exception may fail, increasing PE risk.
Do UK Amazon FBA sellers need to file U.S. tax returns even if no tax is due?
Often, yes.
Many advisers recommend filing a protective U.S. tax return (Form 1120-F for companies or Form 1040-NR for individuals) together with Form 8833 to disclose the treaty position.
Protective filings:
- Start the statute of limitations
- Preserve deductions
- Reduce the risk of gross-income taxation if the IRS challenges the treaty claim later
What happens if a UK seller does not file a U.S. return?
Failure to file can result in:
- Loss of treaty protection in practice
- Denial of deductions
- Taxation on a gross income basis rather than net profit
- Ongoing exposure with no statute of limitations
Even where no U.S. tax is ultimately payable, non-filing materially increases risk.
Do U.S. states follow the UK–U.S. tax treaty?
No.
U.S. states are not bound by federal tax treaties. Even where treaty protection eliminates federal income tax, state-level obligations may still apply.
Inventory stored in a state through Amazon FBA typically creates physical nexus, triggering:
- Sales tax registration and collection
- Potential state income or franchise tax filings
Do Amazon FBA sellers need to register for U.S. sales tax?
In most cases, yes.
Amazon FBA inventory stored in U.S. states generally creates physical nexus for sales tax purposes. Many states also impose economic nexus thresholds based on sales volume or transaction count.
While Amazon may collect sales tax in many states as a marketplace facilitator, registration and reporting obligations can still exist.
Can UK sellers claim relief from double taxation?
Yes.
Where U.S. tax is properly paid, Article 24 of the treaty requires the UK to grant a foreign tax credit against UK corporation tax on the same profits, subject to standard limitations.
To claim relief, proper U.S. filings and documentation are essential.
Has HMRC guidance on Permanent Establishment changed recently?
Yes.
HMRC’s Permanent Establishment Manual was updated in January 2026, reinforcing:
- The importance of the “solely” condition
- The application of anti-fragmentation rules
- The need for fact-specific analysis
This makes up-to-date advice critical, particularly for ecommerce businesses operating cross-border.
Should UK Amazon FBA sellers get specialist U.S. tax advice?
Absolutely.
Amazon FBA structures are fact-sensitive, and small operational changes can materially affect tax outcomes. Given evolving treaty interpretation, state-level rules, and IRS enforcement practices, specialist cross-border tax advice is strongly recommended.
