Why use an e-commerce accountant in 2026

Updated April 2026 - Launching an online store seems simple. Managing it from an accounting perspective is much less so. Between marketplace feeds, Stripe commissions, multi-country VAT, customer returns and mandatory electronic invoicing since September 2026, e-commerce accounting requires expertise that few generalists really master. Calling on an e-commerce accountant is not a luxury: it is the difference between reliable management and costly tax errors.

Direct answer: An e-commerce accountant provides specific mastery of the issues specific to online sales: cross-border VAT (OSS/IOSS), reconciliation of marketplace and payment flows, electronic invoicing, returns and stock management. Unlike a general accountant, he immediately understands the structure of your data, identifies recovery risks and transforms your raw exports into usable margin indicators.

Accounting for an online store is unlike any other business model. Where a traditional business issues invoices, cashes checks and tracks physical inventory, an e-retailer manages simultaneous digital flows that constantly intersect.

Each sale generates several layers of data: the gross amount displayed on the marketplace, platform commissions, payment fees, logistics costs, VAT collected, refunds, disputes. None of these layers correspond directly to the bank transfer received.

The main e-commerce accounting challenges include:

• Multiplicity of channels: own site (Shopify, WooCommerce, PrestaShop), marketplaces (Amazon, Cdiscount, Etsy), social networks (Instagram Shopping, TikTok Shop);
• Cash flow lags: the platforms pay the funds with a delay of 7 to 14 days, creating a gap between the recorded sale and the actual collection;
• Returns management: a return rate of 15 to 30% depending on the sector, with a direct impact on net turnover and VAT;
• Dependence on tools: the quality of accounting directly depends on the integration between the store, the invoicing software and the accounting software.

VAT is undoubtedly the number one complexity item for any e-retailer. Since the European reform entered into force in 2021 and strengthened in 2026, the rules have changed radically.

The single threshold of €10,000 for intra-EU sales

Since July 1, 2021, a single threshold of €10,000 in annual turnover replaces the old thresholds by country. Below this amount, you apply French VAT. Beyond that, you must either:

• register for VAT in each country of destination;
• or use the OSS (One Stop Shop) counter to declare and pay VAT for all your client countries via a single quarterly declaration in France.

IOSS for imports of less than €150

The IOSS (Import One Stop Shop) regime concerns sales of goods imported from outside the EU with a value of less than €150. It allows VAT to be collected at the time of sale and avoids customs clearance costs for the end customer. Since 2026, marketplaces have been considered liable for account in many cases, which further complicates the qualification of flows.

Marketplaces: liable on behalf

Since 2021, platforms such as Amazon or Cdiscount are considered payable on behalf of VAT for sales from third-party sellers not established in the EU. For a French seller, this means that the marketplace collects and remits VAT in some cases, but not in all. Knowing how to identify who is responsible is essential to avoid double reporting — or omissions.

To find out more, consult our guide on VAT and IOSS 2026 Obligations.

Since September 1, 2026, electronic invoicing is mandatory for all companies subject to VAT in France. This reform directly impacts e-retailers on several points.

Concrete obligations

• Issuance of electronic invoices in structured format (Factur-X, UBL or CII) for all B2B sales;
• Transmission via a dematerialization platform (PDP) approved by the tax administration;
• E-reporting: transmission of payment data and B2C invoices to the administration.

The specific impact on e-commerce

For an e-retailer who carries out thousands of B2C transactions per month, e-reporting represents a considerable volume of data. Marketplaces have their own reporting obligations, but the seller remains responsible for the compliance of their own data. An online accountant accustomed to e-commerce knows how to anticipate these volumes and set up the right connectors between your store and the dematerialization platform.

To learn more, see our article on Electronic invoicing 2026.

This is often where the trouble begins. Amazon does not pay the amount of your sales. It pays the amount of your sales less commissions, FBA logistics fees, storage fees, refunds, reserves and miscellaneous adjustments.

Concrete example

Let's imagine a seller who makes €50,000 in gross sales on Amazon in one month. The transfer received will be approximately €35,000 to €38,000 after deduction of:

• marketplace commissions (8 to 15% depending on the category);
• FBA logistics and storage costs;
• Amazon Ads advertising costs;
• refunds and customer disputes;
• exchange fees if international sales.

Without a rigorous reconciliation between the gross turnover, the costs deducted and the net received, the accounting becomes false from the first month. And false accounting leads to incorrect VAT declarations, inaccurate tax results and blind management.

Hayot Expertise advice: in e-commerce, the figures are rarely "false" in the raw sense. They are often incomplete, poorly reconciled or poorly qualified. This is where the real margin and VAT differences arise.

A general practice can technically keep e-commerce accounts. But the question isn't whether he can, it's whether he knows how to do it effectively.

An accountant specialized in e-commerce brings skills that you will not find elsewhere:

• Reading settlement marketplace reports: he knows how to extract useful information from an Amazon Settlement report or a Mirakl statement;
• Rapid qualification of VAT issues: it immediately identifies whether you fall under the OSS, the IOSS, the general regime or a combination;
• Organization of supporting documents: it sets up a method for collecting and classifying exports, payment receipts and platform statements;
• Real margin management: it transforms your raw data into usable dashboards: margin by channel, acquisition cost, real profitability after all costs.

What to expect from a firm adapted to e-commerce

• real mastery of digital flows and payment APIs;
• a clear reading of French, European and international VAT;
• a robust bank reconciliation method, automated as much as possible;
• an ability to link accounting, e-commerce tools and financial management;
• an understanding of logistics issues (FBA, 3PL, dropshipping) and their accounting impact.

All firms are not equal when it comes to the specificities of e-commerce. Here are the questions to ask before you commit:

1. Do you already have e-commerce clients? — Ask for concrete references (Shopify, Amazon, PrestaShop, etc.);
2. How ​​do you manage marketplace reports? — A good firm must be able to explain its reconciliation method;
3. Which accounting tool do you use? — Cloud tools (Pennylane, QuickBooks, Xero) offer better integrations with e-commerce platforms;
4. How ​​do you support electronic invoicing? — The firm must have a clear answer on the chosen PDP and the migration process;
5. Do you offer margin management? — Accounting should not be limited to tax compliance.