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Ecommerce Bookkeeping Services

📅 June 2026⏱ 3 min read✍️ Mary Williams

Selling online generates a flood of data: platform fees, payment processor deductions, multi-state sales tax, returns, and inventory that moves constantly. Ecommerce bookkeeping turns that chaos into clean numbers so you know your true margins and stay compliant across every state you sell in. Here is what online sellers need to track and how to get help.

Why ecommerce bookkeeping is uniquely tricky

Ecommerce accounting has to untangle gross sales from the fees platforms and processors skim off the top, track inventory and cost of goods sold accurately, and handle sales tax across multiple states. A single Shopify or Amazon payout can bundle sales, refunds, and fees into one number, and getting it wrong distorts your entire profit picture.

What ecommerce bookkeeping should track

Your bank deposit is not your revenue. Platform and processor fees can quietly eat double-digit percentages, ecommerce bookkeeping makes the real number visible.

Sales tax and the ecommerce tax accountant

Economic nexus rules mean you may owe sales tax in states where you have no physical presence. An ecommerce tax accountant works hand-in-hand with your bookkeeping to track where you have nexus and keep you compliant. Clean books make this manageable; messy books make it a liability.

Choosing an ecommerce bookkeeping provider

Look for someone who has worked with your platforms, Shopify, Amazon, WooCommerce, or others, and understands inventory and multi-state tax. Generic bookkeeping for online business often misses fee reconciliation and nexus tracking. The general vetting principles in the Best Bookkeeping Services for Small Business still apply.

Knowing your true margins

Once fees and COGS are accounted for, you can finally see real margins by product and channel, the foundation of smart growth. Our guide to Small Business Financial Planning shows how to turn those numbers into a plan.

Reconciling platform payouts correctly

A single Shopify, Amazon, or Stripe payout often bundles gross sales, refunds, platform fees, processing fees, and reserves into one deposit. Booking that deposit as revenue understates your sales and overstates your margin. Proper ecommerce bookkeeping breaks each payout into its components, so your profit and loss reflects true revenue and true costs, not just what hit your bank.

Inventory and cost of goods sold

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Frequently Asked Questions

Why is my bank deposit different from my sales?

Platforms and processors deduct fees, refunds, and reserves before paying you. Proper bookkeeping separates these so you see true revenue.

Do I owe sales tax in other states?

Possibly. Economic nexus rules can create sales tax obligations in states where you have enough sales, even with no physical presence.

How is ecommerce inventory tracked?

Through cost of goods sold and inventory valuation, so profit reflects actual product costs rather than just cash flow.

How do I handle Amazon or Shopify fees in my books?

Each payout must be split into gross sales, fees, refunds, and reserves. Specialized tools and an experienced bookkeeper automate this so your numbers stay accurate.

When do I owe sales tax in another state?

When you cross that state's economic nexus threshold, typically a sales or transaction volume. An ecommerce tax specialist tracks where you have obligations as you grow.

MW
Mary Williams · ACCA · US GAAP
Head of Bookkeeping & Compliance. ACCA-qualified specialist in US GAAP bookkeeping, financial reporting, and compliance for small businesses and early-stage startups.

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