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Certified E-commerce Accountants UK

HMRC investigations, VAT penalties, messy profit tracking? As top-tier ecommerce accounting specialists, we fix what others miss – from Amazon FBA reconciliations to Making Tax Digital compliance. 500+ UK sellers trust us to keep their business safe and profitable.
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Seller Central PPC ROI Analysis
MTD for Shopify
Sellers
Multi-Channel VAT (UK/EU)

The Hidden Accounting Traps Killing UK E-Commerce Businesses

UK e-commerce businesses face a minefield of financial headaches: Amazon FBA sellers lose thousands to hidden fees and COGS miscalculations, Shopify stores drown in MTD/VAT filing errors, and eBay traders face sudden HMRC investigations due to unreported global sales. Add multi-channel inventory chaos, IR35 risks for freelancers, and 20%+ overpaid tax from poor R&D claims – it’s no wonder 68% of online sellers call accounting their #1 growth blocker.

Sigma cuts through the chaos with e-commerce-exclusive fixes

Amazon FBA

We audit your Seller Central PPC, fees, and COGS to recover 15%+ lost profits.

Shopify/Etsy

Automated, accurate, MTD-compliant VAT filing that saves 8 hours/month.

eBay Global Sellers

Full UK & EU VAT registration to prevent HMRC fines.

7-Figure Brands

Cash flow forecasting to scale 25% faster without tax surprises.

The Sigma Method

Your E-Commerce Accounting Solutions

We know e-commerce accounting isn’t just about numbers—it’s about your time, profit, and peace of mind. That’s why 500+ UK sellers trust our step-by-step system to keep them compliant, tax-efficient, and scaling without surprises.
Discovery Deep Dive

Discovery Deep
Dive

We start by dissecting your entire operation—Amazon FBA fees, Shopify MTD gaps, eBay’s VAT rules—because we can’t fix what we don’t understand. No generic templates; just your actual pain points.
Profit Leak Forensics

Profit Leak
Forensics

Using tools like SellerBoard and Xero, we audit your last 12 months to find misclassified expenses, overpaid VAT, and PPC waste—most clients recover 15-30% in “lost” cash.
Smart Process Automation

Compliance Firewall Setup

HMRC’s new MTD rules? EU VAT for global sales? We reconfigure your workflows to auto-capture every transaction—so you’re audit-proof without the admin nightmares.
R&D Tax Credit Claims

Live Financial Dashboards

You’ll log in daily to see real-time profit per SKU, ad spend ROI, and cash flow forecasts—not just a quarterly tax bill. We sync Seller Central, Shopify, and Stripe seamlessly.
Tax War Room Sessions

Tax War Room Sessions

Every quarter, we run “what-if” scenarios to legally slash liabilities—like reclassifying warehouse costs as R&D or claiming £50k+ in overlooked R&D tax credits.
HMRC Attack Plan

HMRC Attack
Plan

If you get a compliance letter (like 1 in 3 Amazon sellers do), we take over all communication—using our 95% success rate to shut down inquiries fast.
Hassle-Free Payroll & Pensions

Scale-Ready
Payroll

Hiring VAs or devs? We structure contracts to dodge IR35 landmines and automate payroll—cutting 10+ hours/month of admin for growing teams.
MTD-Compliant VAT Management

Exit Strategy
Prep

Planning to sell your brand? We pre-audit your books to boost valuation—fixing metrics like inventory turnover and EBITDA that buyers scrutinize.

E-Commerce Accounting Services That Actually Understand Your Business

Running an online business means juggling multiple sales channels, fluctuating VAT rules, and messy data—all while trying to scale. Most e-commerce accountants just file your taxes; we optimise your entire financial engine. From integrating Shopify with MTD-compliant software to untangling Amazon’s hidden fees, our accounting for e-commerce business services are built for real online sellers, not spreadsheets.
We Handle the Complexities So You Don’t Have To:
  • Multi-platform chaos? Sync Amazon, eBay & Shopify in one dashboard.
  • VAT headaches:Automated filings for UK, EU & global marketplaces
  • Making Tax Digital (MTD):No more last-minute scrambles for HMRC
  • Profit-killing fees :Audit Amazon FBA & ads to recover 15–30%.
  • R&D tax credits:Average £50k+ claimed for tech-driven sellers
  • Payroll for remote teams:IR35-safe contracts & auto-payments

Social Commerce Accountants Who Speak Your Language

If you’re scaling on Instagram, TikTok Shop, or Facebook Marketplace, you need more than a tax return—you need an accountant who lives in your world. At Sigma, we’re specialists in social-first commerce, helping creators and DTC brands turn viral moments into sustainable profits. While others struggle with platform payouts and influencer collaborations, we automate your financial ops so you can focus on what you do best: selling.

TikTok Shop & Meta Payouts Decoded

Never lose track of commissions or chargebacks again

Influencer Collab Accounting

Properly track affiliate payouts and UGC costs

Live Commerce Tax Handling

Real-time sales tax compliance during drops and flash sales

Platform Fee Audits

Recover 10-15% in overpaid TikTok/Instagram selling fees

Creator VAT Solutions

Special schemes for digital products and cross-border sales

Dropshipping Financials

Clean books for brands using 3PLs and print-on-demand

Why E-Commerce Brands Choose Sigma?

In a sea of accountants, we stand apart. Sigma is built by e-commerce experts, for e-commerce founders—proven by our track record of higher profits, lower taxes, and zero HMRC surprises for 500+ UK online sellers.
While others take your numbers at face value, we forensically examine your Seller Central, Shopify, and ad spend data—finding an average of £18k/year in recoverable costs for clients.
Amazon FBA? TikTok Shop? We tailor every VAT scheme, R&D claim, and duty calculation to your exact sales channels—because Shopify accounting ≠ eBay accounting.
We don’t just file your taxes—we optimise your unit economics, inventory turns, and cash flow to help 7-figure brands scale 30% faster with financial confidence.
If you’re audited, we handle every letter, call, and deadline—with a 95% success rate at reducing penalties to £0. (Try getting that from a high street accountant.)
Why Sigma Chartered Accountants Wins Where Others Fall Short
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