Bookkeeping for Amazon Sellers: The Complete Guide

Most Amazon sellers know their best-selling product SKU by heart. But ask them what their net profit margin was last quarter—after fees, refunds, and inventory costs—and you'll often get a blank stare.

That's the hidden challenge of selling on Amazon: the storefront is easy, but the accounting underneath is surprisingly complex. Amazon's unique payment structure, fee deductions, and multi-state sales tax obligations create bookkeeping headaches that trip up even experienced business owners.

This guide walks you through everything you need to know to keep clean books as an Amazon seller—from understanding your settlement reports to managing sales tax, tracking COGS, and knowing when to call in a professional.

Why Amazon Bookkeeping Is More Complex Than It Looks

At first glance, Amazon seems like a simple platform: you sell, Amazon collects, Amazon pays you. Easy, right?

Not quite. Here's what's actually happening behind the scenes:

Amazon holds your money. Amazon collects payment from customers and deposits funds to your bank account in biweekly "settlements." Between the sale and the payout, Amazon deducts its fees—referral fees, fulfillment fees (FBA), advertising costs, and more. These deductions happen inside Amazon, meaning they never touch your bank account.

That creates a bookkeeping problem. If you only track your bank deposits, you're missing a significant portion of your expenses. Amazon fees are tax-deductible—but if you never record them, you'll overpay on taxes and have an inaccurate picture of your profitability.

Sales tax is a maze. Amazon collects and remits sales tax on your behalf in most states (under marketplace facilitator laws), but not all states and not all sellers have the same obligations. If you also sell on your own website or at other venues, sales tax tracking gets even more complicated.

Returns and refunds distort your revenue. Amazon processes customer refunds and charges back sellers. Without tracking these separately, your revenue figures will be inflated.

The Amazon Settlement Report: Your Bookkeeping Foundation

Every two weeks (or weekly, if you qualify), Amazon generates a settlement report—a detailed breakdown of everything that happened in that period: gross sales, refunds, FBA fees, referral fees, advertising spend, storage fees, and the net amount deposited to your bank.

This report is the single most important document in your Amazon bookkeeping workflow. You need to reconcile it against your bank statement every settlement period.

What to Look For in Your Settlement Report

• Gross product sales – Your total revenue before any deductions
• Product charges – What customers actually paid
• Refunds – Returns and reimbursements issued
• Amazon fees – Referral fees (usually 8–15% of sales price), FBA fulfillment fees, monthly storage fees
• Advertising fees – Sponsored Products, Sponsored Brands costs
• Other adjustments – Promotional rebates, A-to-Z guarantee claims
• Net deposit – What hits your bank account

Each of these line items needs to flow into your accounting records correctly.

Setting Up Your Chart of Accounts for Amazon

Whether you use accounting software or manage a spreadsheet, you need the right categories to capture Amazon's complexity. Here's a recommended chart of accounts for Amazon sellers:

Revenue Accounts

• Amazon Sales – Gross product sales
• Amazon Refunds – Contra-revenue account for customer refunds (negative)

Cost of Goods Sold (COGS)

• Product Cost – What you paid to manufacture or source inventory
• Inbound Shipping – Cost to ship inventory to Amazon FBA warehouses

Operating Expenses

• Amazon Referral Fees – Platform commission on each sale
• FBA Fulfillment Fees – Per-unit pick, pack, and ship fees
• FBA Storage Fees – Monthly storage charges in Amazon's warehouses
• Amazon Advertising – PPC campaigns (Sponsored Products, Sponsored Brands, etc.)
• Amazon Subscription Fees – Professional Seller account ($39.99/month)
• Amazon Returns Processing – Return fees charged by Amazon
• Other Amazon Fees – Long-term storage, removal order fees, etc.

Having dedicated accounts for each fee type makes it much easier to analyze your cost structure and find areas to improve profitability.

Cash Basis vs. Accrual Accounting for Amazon Sellers

Most small Amazon sellers use cash basis accounting—recording revenue when money hits your bank account and expenses when they're paid. It's simpler and works fine for most solo and small-team operations.

Accrual accounting records revenue when earned (at time of sale) and expenses when incurred. It provides a more accurate picture of business performance and is required by GAAP if you ever need audited financials (for investors, large loans, etc.).

For tax purposes, if your gross receipts are under $25 million, you can use cash basis. Most small Amazon sellers stick with cash basis until they scale significantly.

Recording the Settlement Under Cash Basis

When you receive your biweekly Amazon deposit, here's a simplified recording approach:

1. The deposit hits your bank account—record it as a debit to Cash
2. Create a corresponding entry that breaks out: gross sales (credit to Amazon Sales), fees (debit to the relevant expense accounts), and net deposit (which should equal the cash received)
3. Record any refunds as a reduction of revenue

This reconciliation should be done within a few days of each settlement so discrepancies don't accumulate.

Tracking Inventory and Cost of Goods Sold

For Amazon FBA sellers, inventory tracking is one of the most important—and most neglected—bookkeeping tasks.

Why it matters:

• COGS directly reduces your taxable income
• Unsold inventory is an asset on your balance sheet
• Inventory tracking reveals your true product margins

Two Common Inventory Methods

Periodic inventory – You count inventory at the start and end of each accounting period. COGS is calculated as: Beginning Inventory + Purchases – Ending Inventory. Simpler, but requires periodic counts.

Perpetual inventory – You track inventory changes in real time with every purchase and sale. More accurate, typically requires software integration.

For growing Amazon businesses, perpetual tracking through your accounting software or a dedicated inventory tool (like Linnworks, Skubana, or Inventory Planner) provides much better visibility.

What to Include in Your COGS

• Manufacturing or wholesale cost of goods
• Import duties and customs fees
• Freight to your prep center or Amazon warehouse
• Prep and inspection costs (labeling, bundling, etc.)

Don't include fulfillment fees, advertising, or platform fees—those are operating expenses, not COGS.

Sales Tax for Amazon Sellers

Sales tax is the area where Amazon sellers most commonly make expensive mistakes. Here's what you need to understand:

Marketplace Facilitator Laws

In most US states, Amazon is classified as a "marketplace facilitator" and is required to collect and remit sales tax on your behalf. This means for most Amazon FBA sales, you don't need to worry about collecting and remitting sales tax yourself—Amazon does it automatically.

However, there are important exceptions:

• Sales through your own website or other non-Amazon channels
• States where marketplace facilitator laws don't apply (a small but shrinking number)
• Certain categories or seller types that may be excluded

Nexus and Your Obligations

Even if Amazon collects sales tax for marketplace sales, you still need to understand where you have nexus—a sufficient connection to a state that creates a tax collection obligation for your own sales.

FBA sellers have a unique complication: because Amazon stores your inventory in warehouses across the country, you may have nexus in states where you've never set foot. Amazon's FBA warehouses are located in dozens of states, and storing inventory there can trigger nexus.

If you sell through your own website or other channels, you need to track and remit sales tax in states where you have nexus.

What to Do

1. Run an inventory placement report to identify which states Amazon stores your products in
2. Register for sales tax collection in states where you have FBA-created nexus (if required)
3. Use sales tax automation software (TaxJar, Avalara, or similar) if managing multiple states
4. Keep records of Amazon's marketplace facilitator tax collections in case of state inquiries

Managing FBA Inventory Reconciliation

Amazon isn't perfect with inventory. Units get lost, damaged, or disposed of. Amazon typically reimburses sellers for these events, but you need to track them.

Regularly reconcile:

• Units sent to FBA vs. units received at Amazon (inbound shipment discrepancies)
• Lost or damaged inventory reimbursements (these count as income and need to be recorded)
• Removal orders (when you bring inventory back from FBA)
• Destroyed or disposed inventory (creates a COGS deduction)

Use the Inventory Adjustments report in Seller Central to identify discrepancies and ensure you're receiving all reimbursements you're entitled to.

Quarterly Estimated Taxes

Amazon doesn't withhold income taxes on your behalf the way an employer does. As a self-employed seller (or business owner), you're responsible for paying quarterly estimated taxes.

Who needs to pay: If you expect to owe $1,000 or more in federal income tax, you need to make quarterly estimated payments.

Due dates for 2026:

• Q1 (Jan–Mar): April 15
• Q2 (Apr–Jun): June 16
• Q3 (Jul–Sep): September 15
• Q4 (Oct–Dec): January 15, 2027

How much to pay: Use the "safe harbor" rule—pay 100% of last year's tax liability (or 110% if your adjusted gross income was over $150,000), or pay 90% of the current year's expected tax. Whichever is smaller keeps you penalty-free.

Missing quarterly payments leads to underpayment penalties, even if you settle up in April.

Common Amazon Bookkeeping Mistakes to Avoid

1. Recording Only Bank Deposits as Revenue

The deposit is net of fees. If you record only the deposit amount, you're understating both revenue and expenses. Always reconcile to gross sales from your settlement report.

2. Ignoring Amazon Fees as Expenses

Referral fees, FBA fees, and advertising costs are all legitimate tax deductions. Not recording them inflates your taxable income.

3. Mixing Business and Personal Finances

Run all Amazon income through a dedicated business bank account and pay all business expenses from that account. Commingling finances makes bookkeeping harder and creates liability issues.

4. Not Tracking Inventory Accurately

If you don't know your true cost of goods sold, you don't know your real profit margins. Inaccurate inventory also leads to incorrect balance sheets and potential tax errors.

5. Falling Behind on Reconciliation

The longer you wait to reconcile your settlement reports, the harder it becomes. Monthly reconciliation is the minimum; weekly is better for high-volume sellers.

6. Forgetting About Reimbursements

Amazon reimbursements for lost or damaged inventory are taxable income. Many sellers forget to record them, creating a discrepancy between reported income and 1099-K totals.

When to Hire a Professional Bookkeeper

DIY bookkeeping works for many new sellers, but there's a point where professional help pays for itself many times over.

Consider hiring a bookkeeper when:

• Your monthly revenue exceeds $10,000–$15,000
• You sell on multiple channels (Amazon, Shopify, eBay, wholesale, etc.)
• You import products internationally and deal with duties and currency conversion
• You're spending more than a few hours per month on bookkeeping
• You've fallen more than a month behind
• You're not confident in your numbers at tax time

Look for a bookkeeper or accountant who has specific experience with ecommerce and Amazon sellers. They'll understand settlement reports, FBA fee structures, and the nuances of multi-state sales tax in a way that a generalist bookkeeper may not.

Tools That Help Amazon Sellers Stay Organized

While any accounting software can be configured for Amazon sellers, some tools are particularly well-suited:

• A2X – Automatically maps Amazon settlement data to your accounting software with proper categorization
• Fetcher – Profit and loss tracking specifically for Amazon sellers
• Inventory Planner – Demand forecasting and inventory management with financial visibility
• TaxJar / Avalara – Automated sales tax tracking and filing
• Google Sheets with Amazon reports – Still used by many small sellers for manual reconciliation

Whatever tools you choose, consistency matters more than sophistication. A simple system you use every month beats a complex system you never update.

Keep Your Amazon Finances Organized from Day One

Whether you're just launching your first product or managing a seven-figure Amazon store, accurate financial records are the foundation of a sustainable business. Clean books let you understand your actual margins, make informed decisions about inventory and advertising, and avoid surprises at tax time.

Beancount.io provides plain-text accounting that gives Amazon sellers complete transparency and control over their financial data—with version history, easy auditing, and no vendor lock-in. Get started for free and see why developers and data-driven sellers are choosing a more transparent approach to accounting.