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E-commerce Accountants

Comprehensive accounting for online retailers including multi-channel integration, marketplace reconciliation, international VAT, and inventory tracking.

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Written by Asrah Abbas, ACA / ACCA — Principal at Westfin Accountants Ltd
Chartered accountant with 12+ years of UK practice experience. Member of the Institute of Chartered Accountants in England and Wales (ICAEW) and the Association of Chartered Certified Accountants (ACCA).
Last updated:

In plain English

E-commerce accounting is materially different from bricks-and-mortar: multi-channel revenue (Shopify, Amazon, Etsy), platform fees, marketplace VAT collection, inventory valuation, and cross-border duty. Westfin reconciles Stripe, Klarna and PayPal feeds daily, manages Amazon FBA accounting (deferred revenue, FBA fees, storage), and handles One Stop Shop (OSS / IOSS) for EU B2C.

Sector-specific tax matters

The reliefs, schemes and risks that consistently apply in this sector — with HMRC source links so you can verify everything we say.

VAT One Stop Shop (OSS)

For EU B2C sales > €10,000/yr — single quarterly return covering all 27 member states instead of registering in each.

Reference (gov.uk)
Marketplace VAT (Amazon, eBay)

Online marketplaces are deemed supplier for £135-and-under imports and for sellers established overseas — they collect VAT, not you.

Reference (gov.uk)
Plastic Packaging Tax

£217/tonne on plastic packaging with < 30% recycled content; applies if you manufacture or import ≥ 10 tonnes/yr.

Reference (gov.uk)
Stock valuation under FRS 102

Inventory valued at lower of cost and net realisable value; FIFO or weighted-average required for tax purposes.

Reference (gov.uk)

Common E-commerce Accounting Challenges

Multi-channel sales reconciliation

Marketplace fees and commissions

International VAT and customs

Inventory across multiple warehouses

Returns and refunds tracking

Payment gateway reconciliation

Our E-commerce Solutions

Automated marketplace integration

Multi-currency accounting

Real-time inventory sync

EU and international VAT compliance

Payment processor reconciliation

Return rate analysis

Specialized Services for E-commerce

Shopify, Amazon, eBay integration

Multi-marketplace consolidated reporting

International VAT (OSS, IOSS) compliance

Inventory management across channels

Payment gateway reconciliation

Dropshipping accounting

E-commerce FAQs

How do you reconcile Amazon seller accounts?

We integrate with Amazon Seller Central using A2X or Link My Books, automatically importing sales, fees, refunds, and reserves for accurate reconciliation and profitability analysis.

Do I need to register for VAT in EU countries?

Post-Brexit, UK sellers exceeding €10,000 EU sales can use OSS (One Stop Shop) for simplified VAT compliance. We handle registrations and returns for all EU sales.

Can you track inventory across multiple warehouses?

Yes, we integrate with inventory systems like Cin7, Unleashed, or TradeGecko to track stock across your own warehouses, Amazon FBA, and third-party fulfillment centers.

Ready to Get Started?

Speak to our E-commerce accounting specialists today