Amazon FBA Sellers: Accounting, Taxes, and Financial Management

Selling through a fulfilment programme means the platform holds your stock, handles delivery, collects the money and deducts its costs before anything reaches you.

Everything difficult about the accounting follows from that. What lands in the bank is a net figure covering sales, refunds, fees and reimbursements, and it matches nothing in the sales reports until somebody breaks it apart.

This covers how the revenue actually works, when it should be recognised, how marketplace-collected sales tax is treated, how cost of sales is built from stock, and the tools that make the reconciliation manageable.

How Amazon FBA Revenue Works

When a customer buys your product on Amazon, Amazon collects the full purchase price, deducts its fees (referral, FBA fulfillment, storage), and deposits the net amount to your bank account every two weeks (bi-weekly settlement). This means you never see the full gross revenue in your bank, only the net proceeds after Amazon's cut.

Amazon FBA Revenue Recognition

Revenue is recognized when the customer's order ships (transfer of control), not when Amazon settles payment to you. This creates a timing difference between your economic activity and your bank deposits.

• Use accounting software that pulls from Amazon's Seller Central reports, not just bank feeds
• Tools like A2X, Taxomate, or Sellerboard map Amazon settlement data to proper revenue categories
• Track gross sales, returns/refunds, and each fee type separately

Sales Tax and Marketplace Facilitator Laws

This is the most misunderstood area for Amazon sellers. Under Marketplace Facilitator laws, Amazon collects and remits sales tax on your behalf in most US states. You are not responsible for collecting or remitting tax on orders Amazon handles as a marketplace facilitator.

• Amazon is a marketplace facilitator in all 50 states (and DC)
• For most FBA sellers, Amazon handles sales tax collection automatically
• Your obligation: understand where your economic or physical nexus exists, and file any required returns even if Amazon paid the tax (some states require the seller to file a zero return)
• States with no sales tax: Montana, New Hampshire, Oregon, Delaware, Alaska

Pro Tip: Use TaxJar or Avalara to monitor your nexus exposure across all channels. Amazon settlement reports show where customers are located.

Cost of Goods Sold for FBA Sellers

COGS for an FBA seller includes more than just the purchase price of inventory:

FBA fulfillment fees can be treated as COGS or operating expense, pick one method and be consistent. Most accountants treat them as COGS since they are directly tied to each unit sold.

Inventory Accounting: FIFO Method

Amazon FBA sellers typically use FIFO (First In, First Out) for inventory valuation. FIFO means the oldest inventory units are assumed sold first.

• FIFO is required for most inventory-heavy businesses under US GAAP
• In an inflationary environment, FIFO produces lower COGS and higher reported profit vs. LIFO
• Track inventory by purchase lot: date, unit count, per-unit cost
• At month-end, calculate ending inventory value: units remaining x cost of oldest unsold batch

Recommended Tools for Amazon FBA Accounting

S-Corp Election for FBA Sellers

Once your FBA business nets $40,000-$50,000+ in annual profit, an S-corp election can reduce your self-employment tax bill significantly. An S-corp lets you split income between a reasonable salary (subject to payroll taxes) and distributions (not subject to SE tax).

Example: $150,000 net profit. As a sole proprietor, you pay 15.3% SE tax on the full amount (approx. $22,950). As an S-corp with a $70,000 salary, you pay payroll taxes only on $70,000 (approx. $10,710 in employee + employer share) and take $80,000 as a distribution with no SE tax. Savings: ~$12,000/year.

Quarterly Estimated Taxes

FBA sellers who operate as sole proprietors, partnerships, or S-corp shareholders must pay quarterly estimated taxes to avoid underpayment penalties. Due dates: April 15, June 15, September 15, January 15 of the following year.

• Safe harbor: pay 100% of prior year's tax liability (110% if prior year AGI exceeded $150k)
• Or pay 90% of current year's actual liability
• Set aside 25-30% of net profit each month in a separate savings account earmarked for taxes

Frequently Asked Questions

Written by

Abhinav Gupta, CPA, CA, MBA

Abhinav works with business owners across the US on industry-specific bookkeeping, from dental practices and restaurants to construction and e-commerce. He writes about what each trade's books actually need. Connect on LinkedIn