US Sales Tax Guide for UK Ecommerce Sellers (2026)

What UK ecommerce sellers need to know about U.S. sales tax — how it differs from VAT, what triggers registration, and how to handle compliance from London, Manchester, Edinburgh or Bristol.

Why This Matters For UK Sellers

UK ecommerce sellers selling into the United States — through Amazon FBA, Shopify, Walmart Marketplace, Etsy, or a branded website — face the same U.S. sales tax obligations as any other foreign or domestic seller. The UK–US tax treaty doesn’t help (it covers income tax only), and post-Brexit, EU rules don’t apply either.

UK sellers have one big conceptual advantage and one big conceptual disadvantage:

• Advantage: You already understand transaction tax mechanics from VAT. Sales tax is structurally simpler.
• Disadvantage: U.S. sales tax has NO INPUT CREDIT. Unlike VAT, you cannot reclaim tax paid on your business inputs. It is a pure exit tax on the final consumer, paid in addition to your other costs.

This guide covers what UK sellers need to know — registration, banking, payment mechanics, currency considerations, and how to set up cleanly from a UK base.

Yes, You Owe US Sales Tax. The UK-US Tax Treaty Doesn’t Cover It.

The 2001 UK–US tax treaty (with subsequent protocols) is one of the most comprehensive in the world. It prevents double taxation of business profits, dividends, interest, royalties and pensions, and it sets generous thresholds for U.S. permanent establishment for UK residents.

But the treaty does NOT cover U.S. state sales tax. Sales tax is a state-level transaction tax, not federal income tax. Even with full treaty protection on your business profits (which most UK sellers have, because their U.S. activities don’t constitute permanent establishment), you still owe sales tax in every state where you have nexus.

The 2018 Wayfair decision means all 45 U.S. states with sales tax now apply economic nexus rules to remote sellers — including UK residents. Thresholds run from $100,000 (most states) to $500,000 (California, Texas, New York). UK companies are not exempt.

How U.S. Sales Tax Differs From UK VAT — In Plain English

UK sellers familiar with VAT will spot the key differences quickly:

• State-by-state, not nationwide. There is no U.S. federal VAT. Each of 45 states (plus DC) runs its own sales tax with its own rate, threshold, exemptions, registration form and filing schedule.
• Single-stage, no input credit. Sales tax is collected only once — at the final retail sale to a consumer. Business-to-business sales are typically exempt with a resale certificate. There is no equivalent of the VAT input credit.
• Origin vs destination sourcing. Most states use destination-based sourcing (rate determined by the buyer’s location) but a few are origin-based (rate determined by the seller’s location).
• Local rates on top of state rates. Many states allow counties, cities and special districts to add local sales tax — sometimes pushing the combined rate above 11% (Calumet City, IL).
• No registration threshold for physical presence. Storing inventory in a U.S. state (Amazon FBA) creates immediate registration obligation, regardless of revenue.
• Penalties are state-level. Each state has its own late-filing, late-payment and interest schedule. There’s no central HMRC equivalent.

The Three Most Common Triggers for UK Sellers

1. Amazon FBA inventory in U.S. fulfillment centers

If you ship into Amazon US FBA, your inventory will be stored across 8–25 U.S. states. Each one becomes a state where you owe sales tax registration, regardless of revenue.

2. Direct Shopify or branded site sales

If you sell through your own UK or US Shopify store with US customers, you are the seller of record once your direct sales cross the economic threshold ($100,000 in most states).

3. UK fulfillment partners shipping into the US

If you use a UK-based 3PL (Whistl, Yodel, ParcelHub) that ships orders directly to U.S. customers without going through a U.S. warehouse, you typically only have economic nexus risk — physical nexus from FBA-style inventory storage doesn’t apply. This is a structural advantage of pure direct-from-UK fulfillment, but the cost and shipping time usually make it impractical above ~$500K U.S. revenue.

How To Set Up From the UK

1. Decide your structure. For sales under ~£250K/year U.S. revenue, registering as a UK Ltd is fine. For higher volumes, forming a U.S. LLC owned by your UK Ltd gives you better banking, simpler tax and FX mechanics, and easier customer trust.
2. Get a U.S. EIN. Call IRS at +1-267-941-1099 (M–F 6am–11pm Eastern = M–F 11am–4am UK). Apply by phone with Form SS-4 in front of you. Write ‘FOREIGN’ in the responsible party’s SSN field. EIN issued on the call.
3. Open Wise Business (without U.S. LLC) or Mercury / Brex / Relay (with U.S. LLC). All give you U.S. routing/account numbers for ACH payment of sales tax to state DORs.
4. Register for sales tax in your nexus states. Use your UK business address on the registration forms. Most states accept it. You’ll need EIN, Companies House documents, passport copy and NAICS code (typically 454110).
5. Configure Amazon, Shopify and Walmart with your state registration numbers.
6. File and remit on each state’s cadence.

👉 We handle every step for UK clients. Book a Free Consultation.

Managing Sterling-Dollar Currency on Tax Remittances

UK sellers benefit from one of the deepest GBP–USD currency markets in the world. Conversion costs are minimal compared with rand–dollar or rupee–dollar.

Practical guidance:

• Hold a USD float in your Wise Business or Mercury account equal to 60–90 days of expected U.S. sales tax liability. Buffers monthly volatility.
• Settle Amazon FBA payouts to USD rather than auto-converting to GBP — Amazon’s auto-conversion fee (1–2%) is much higher than Wise’s (0.4%).
• Match calculation currency to remittance currency. Calculate tax in USD throughout the period; convert to GBP for UK Companies House and HMRC reporting at period-end exchange rates.
• For high-volume sellers ($1M+/year U.S. revenue): consider a USD-denominated tax accrual on your UK balance sheet to remove FX volatility from your monthly P&L.

What About Brexit? Does It Change Anything?

Brexit affected UK–EU VAT and customs but had zero impact on U.S. sales tax obligations. The 2018 Wayfair economic nexus rules applied to UK sellers before Brexit and continue to apply after. The UK is no longer in IOSS or OSS for EU VAT — but neither system was relevant to U.S. sales tax in the first place.

The one indirect Brexit effect: many UK sellers post-Brexit chose to consolidate U.S. expansion through Amazon FBA rather than direct UK shipping (to bypass new EU customs friction). This pushed more UK sellers into U.S. physical nexus territory faster than they expected.

Frequently Asked Questions

UK Sellers Have a Conceptual Head Start

Coming from a VAT-literate UK background, you’ll grasp U.S. sales tax mechanics quickly. The hard parts are the operational: 45 different state registrations, EIN application as a foreign entity, ACH-capable banking, and reconciling marketplace-collected vs direct-collected sales monthly.

👉 Book a Free Consultation with our U.S. tax specialists. Fixed fee, end-to-end, no software for you to learn.

Related reading: Do Non-US Sellers Need to Collect US Sales Tax? · How to Register Without a US Address, EIN or Bank Account