INTERNATIONAL ACCOUNTANTS & US–UK TAX SPECIALISTS FOR E-COMMERCE BUSINESSES
US–UK Tax Advisors are expert international accountants for e-commerce businesses, providing specialist US and UK tax services for online retailers, digital brands, and global marketplace sellers. We handle HMRC and IRS compliance, manage cross-border accounting, and optimise international tax structures — helping e-commerce businesses stay compliant, profitable, and focused on what they do best: selling and scaling globally.
International Accountants & US–UK Tax Specialists for E-Commerce Businesses
US–UK Tax Advisors are expert international accountants for e-commerce businesses, providing specialist US and UK tax services for online retailers, digital brands, and global marketplaces. We manage HMRC and IRS compliance, handle cross-border accounting, and optimise international tax structures — helping e-commerce businesses stay compliant, profitable, and ready for global expansion.
Our team of US–UK tax specialists for e-commerce companies ensures seamless financial management across multiple platforms and currencies. From VAT and sales tax registration to inventory accounting, transfer pricing, and double taxation relief, we simplify the complexities of international online trading and ensure accurate financial reporting.
Whether you're a UK-based online retailer selling to U.S. customers or an American e-commerce brand expanding into the UK, US–UK Tax Advisors deliver tailored global accounting solutions that keep your business compliant and efficient — so you can focus on scaling your brand while we manage the financial details.
Cross-Border Tax Planning and Accounting for E-Commerce Businesses
Expanding your e-commerce business internationally brings exciting opportunities — but also complex tax challenges. US–UK Tax Advisors provide expert cross-border tax planning for e-commerce businesses, helping online retailers, digital brands, and marketplace sellers navigate global tax systems with confidence.
Our dual-qualified international accountants for e-commerce ensure full HMRC and IRS compliance while designing efficient tax structures that minimise liability and maximise profit. We assist with VAT and sales tax registration, customs duties, and transfer pricing, making sure your cross-border transactions are handled accurately and strategically.
Whether you're selling through Shopify, Amazon, or your own online store, US–UK Tax Advisors help you structure your global operations efficiently. Our cross-border tax experts ensure that every sale, shipment, and payment works to your financial advantage — so your e-commerce brand can grow globally with stability, compliance, and confidence.
Key Industry Insights:
£120BN
UK e-commerce market value in 2023, with significant cross-border sales growth.
Source: UK E-Commerce Report 2023
68%
Percentage of UK online retailers selling internationally, requiring multi-jurisdiction tax planning.
Source: International E-Commerce Survey 2023
35%
Average tax savings for e-commerce businesses through proper international structuring and VAT optimization.
Source: E-Commerce Tax Planning Guide 2023
Specialist International Accounting Services for E-Commerce Businesses
US–UK Tax Advisors provide comprehensive international accounting services for e-commerce businesses, supporting online retailers, dropshippers, and digital brands selling across borders. Our team helps you stay compliant with HMRC and IRS regulations while managing the financial complexities of operating in multiple countries and currencies.
We offer tailored services including VAT and sales tax management, cross-border bookkeeping, inventory and fulfilment accounting, and tax-efficient business structuring. Our experts also assist with transfer pricing, double taxation relief, and international reporting, ensuring your e-commerce finances are transparent, compliant, and built for growth.
Whether you're a UK e-commerce startup expanding into the U.S. or an American online brand selling to UK customers, US–UK Tax Advisors deliver reliable and strategic financial support. Our international accountants for e-commerce simplify your global accounting — so you can focus on scaling sales, reaching new markets, and driving your business forward.
Why It's Important to Hire Specialist International Accountants for E-Commerce Businesses
Running an e-commerce business across borders comes with complex financial and tax obligations. Every sale, shipment, and transaction can trigger different tax rules in multiple countries. Hiring specialist international accountants for e-commerce businesses ensures your operations remain fully compliant with both HMRC and IRS regulations while keeping your finances structured for global growth and profitability.
From VAT and sales tax registration to cross-border income reporting and inventory accounting, international trading introduces challenges that require expert guidance. A US–UK tax specialist for e-commerce understands how to manage marketplace taxes, avoid double taxation, and create efficient corporate structures that reduce costs and improve cash flow.
At US–UK Tax Advisors, we provide tailored financial and tax support designed for global online retailers. Our international accountants for e-commerce streamline international reporting, optimise tax efficiency, and help you expand with confidence — so your brand can focus on growth while we handle the complexity of global compliance.
Get in Touch
Managing cross-border taxes doesn't have to be complicated. Whether you're a US citizen living in the UK, a UK resident with US tax obligations, or a business operating internationally, our team of specialist US UK tax accountants in London is here to help.
Online retailers and marketplace sellers trading between the US and UK must manage VAT, US state sales tax nexus after Wayfair, import duties, marketplace deemed-supplier rules and cross-border profit taxation. Specialist planning keeps e-commerce brands compliant with HMRC and the IRS while controlling the cash cost of global selling.
Key Takeaways
- US sales tax is state-by-state; economic nexus can require overseas sellers to register.
- US sellers into the UK often need a UK VAT registration and pay import VAT.
- Marketplaces may be deemed supplier, collecting VAT or sales tax for you.
- Holding inventory abroad can create a taxable permanent establishment.
- Entity choice affects Form 5471, GILTI and how HMRC and the IRS treat you.
US–UK Cross-Border Tax: Key Facts
$10,000
Aggregate in foreign accounts at any point in the year triggers a mandatory FBAR (FinCEN Form 114) for US persons.
Source: IRS — FBARWorldwide
US citizens and Green Card holders must file a US return on worldwide income every year, regardless of where they live.
Source: IRS — Citizens Abroad$120,000+
The Foreign Earned Income Exclusion lets qualifying Americans abroad exclude over $120,000 of earned income (indexed annually).
Source: IRS — FEIE31 January
UK Self Assessment online returns and any tax owed are due by 31 January following the 5 April tax year end.
Source: GOV.UK — Self AssessmentE-Commerce US-UK Tax FAQs
When does a UK online retailer need to collect US sales tax?
The US has no national sales tax; each state sets its own rules. Following the Wayfair decision, states can require out-of-state and overseas sellers to register once they cross economic nexus thresholds, usually based on sales revenue or transaction counts in that state. A UK retailer shipping to US customers can therefore have collection duties in several states even without a US physical presence.
How does VAT work for a US seller shipping goods into the UK?
Goods imported into the UK are subject to import VAT and potentially customs duty. For lower-value consignments, UK rules can require the overseas seller or the online marketplace to charge and account for UK VAT at the point of sale. US sellers frequently need a UK VAT registration to sell compliantly, and marketplaces may collect VAT on their behalf under deemed-supplier rules.
Who is responsible for VAT and sales tax on marketplace sales?
Marketplaces such as Amazon and eBay are increasingly treated as the deemed supplier for certain sales, meaning the platform collects and remits VAT or state sales tax instead of the seller. The rules depend on the goods, their value and the customer's location. Sellers still keep their own registration and reporting obligations for sales outside those deemed-supplier rules, so responsibilities must be mapped carefully.
How are e-commerce profits taxed between the US and UK?
Trading profits are taxed where the business is resident, and selling into the other country does not usually create a foreign income tax charge unless you have a permanent establishment there, such as a warehouse or dependent agent. Holding inventory abroad can create a taxable presence, so fulfilment arrangements should be reviewed. The US-UK treaty and foreign tax credits prevent the same profit being taxed twice.
What structure works best for scaling an e-commerce brand across both countries?
As you grow, a US or UK operating company, or both, may be needed to manage inventory, banking and local compliance. A US person owning a UK company faces Form 5471 and possible GILTI, while a US LLC can be treated differently by HMRC and the IRS. We compare structures against your fulfilment model, margins and expansion plans before you commit to setup costs.
Written & reviewed by the US-UK Tax Advisors cross-border tax team — chartered specialists in US and UK taxation, IRS and HMRC compliance, FATCA/FBAR reporting and double-taxation treaty planning.
Last reviewed: July 2026. This page is for general information and is not personal tax advice.