The Complete Guide to Amazon Seller Accounting and Bookkeeping

With nearly 9.7 million sellers worldwide and over 60% of all Amazon sales coming from independent merchants, the marketplace has become one of the most powerful engines for small business growth. But here is a number that should give every Amazon seller pause: 44% of sellers say bookkeeping and accounting is one of their biggest pain points. If you are selling on Amazon—or thinking about it—getting your financial house in order is not optional. It is the difference between a thriving business and an expensive hobby.

This guide walks you through everything you need to know about Amazon seller accounting, from understanding the complex fee structure to tracking cost of goods sold, managing sales tax, and building a system that scales with your business.

Why Amazon Seller Accounting Is Uniquely Challenging

Running an Amazon store is not like operating a traditional retail business. Several factors make the accounting significantly more complex.

The Lump-Sum Settlement Problem

Amazon does not deposit individual transaction amounts into your bank account. Instead, you receive settlement payments every two weeks that bundle together sales revenue, refunds, fees, taxes, and adjustments into a single deposit. Without breaking down each settlement report, you have no real visibility into your actual revenue or expenses.

This means your bank statement will show one deposit—say, $12,847.63—but that number is the net result of potentially thousands of individual transactions. Treating this as simple "revenue" is one of the most common and costly accounting mistakes Amazon sellers make.

A Complex Fee Structure

Amazon charges multiple categories of fees that must be tracked separately for accurate bookkeeping:

• Referral fees: A percentage of each sale (typically 8-15%, varying by category)
• FBA fulfillment fees: Per-unit charges for picking, packing, and shipping
• Monthly storage fees: Based on cubic footage of inventory in fulfillment centers
• Long-term storage fees: Surcharges for inventory stored beyond 365 days
• Removal and disposal fees: Charges for returning or destroying unsold inventory
• Advertising fees: Sponsored Products, Brands, and Display campaign costs
• Subscription fees: The $39.99 monthly Professional seller account fee

Each of these fees is a legitimate business expense that reduces your taxable income—but only if you track them properly.

Multi-State Inventory Distribution

If you use Fulfillment by Amazon (FBA), your inventory is distributed across fulfillment centers in multiple states. You do not get to choose which warehouses Amazon uses. This creates tax nexus in every state where your products are stored, which has significant implications for sales tax obligations.

Setting Up Your Chart of Accounts

A well-organized chart of accounts is the foundation of clean Amazon seller bookkeeping. Here is a recommended structure:

Revenue Accounts

• Product Sales Revenue: Gross sales before any fees or refunds
• Shipping Revenue: Any shipping charges collected from customers
• Refunds and Returns: Track as a contra-revenue account to show true net sales

Cost of Goods Sold (COGS)

• Product Cost: What you paid your supplier for the goods
• Inbound Shipping: Freight costs to get inventory to Amazon warehouses
• Customs and Duties: Import fees if sourcing internationally
• Prep and Labeling: Costs for preparing items for FBA requirements

Amazon Fee Expenses

• Referral Fees
• FBA Fulfillment Fees
• Storage Fees
• Advertising and PPC Costs
• Other Amazon Fees (account health, returns processing, etc.)

Operating Expenses

• Software and Tools: Inventory management, repricing, research tools
• Professional Services: Accountant, bookkeeper, tax preparer
• Office Supplies and Equipment
• Insurance

Tracking Cost of Goods Sold the Right Way

COGS is arguably the most important number in your Amazon business, yet it is the one most sellers get wrong. Your COGS is not just the price you paid for the product. It includes every direct cost to get that product to Amazon's warehouse, ready for sale:

1. Product purchase price (from your supplier)
2. International shipping and freight forwarding
3. Customs duties and import taxes
4. Inspection fees
5. Prep center costs (labeling, poly bagging, bundling)
6. Domestic freight to FBA warehouses

Choosing an Inventory Valuation Method

The IRS requires you to use a consistent method for valuing your inventory. The two most common approaches for Amazon sellers are:

FIFO (First-In, First-Out): Assumes the oldest inventory is sold first. This is the most widely used method and generally aligns well with how Amazon fulfills orders. It provides a more accurate picture of current inventory costs, especially when supplier prices fluctuate.

Weighted Average Cost: Calculates an average cost across all units in stock. This is simpler to maintain and works well if your product costs remain relatively stable.

Whichever method you choose, you must apply it consistently. Switching methods mid-year without IRS approval can trigger audit flags.

Accrual vs. Cash Basis

Most serious Amazon sellers should use accrual-basis accounting. Under this method, you recognize revenue when a sale occurs (not when the settlement hits your bank) and recognize expenses when they are incurred (not when you pay for them). This gives you a real-time picture of profitability rather than a cash-flow-distorted view.

If your annual gross receipts exceed $29 million, the IRS requires accrual-basis accounting. Even below that threshold, accrual accounting is strongly recommended for inventory-based businesses.

Sales Tax: The Marketplace Facilitator Factor

Sales tax used to be a nightmare for Amazon sellers. The good news is that marketplace facilitator laws, now enacted in most U.S. states, require Amazon to collect and remit sales tax on your behalf for orders shipped to those states.

However, this does not eliminate all of your responsibilities:

What Amazon Handles

• Calculating the correct sales tax rate based on the buyer's location
• Collecting the tax at checkout
• Remitting the tax to the appropriate state or local jurisdiction
• Filing returns in marketplace facilitator states

What You Still Need to Do

• Register for sales tax permits in states where you have nexus (even if Amazon collects the tax)
• File zero-dollar returns in states that require filing even when Amazon handles collection
• Track where your inventory is stored to identify which states you have physical nexus in
• Monitor economic nexus thresholds in states where you sell but do not store inventory
• Keep records of all sales tax collected and remitted, in case of an audit

Amazon distributes FBA inventory based on demand patterns, which means your products could end up in warehouses across dozens of states. Review your FBA Inventory Placement report regularly to stay on top of your nexus footprint.

Building a Monthly Bookkeeping Routine

Consistency is the key to manageable Amazon accounting. Here is a monthly routine that keeps your books clean:

Weekly Tasks

• Download and review settlement reports from Seller Central
• Reconcile settlements against your bank deposits
• Record any new inventory purchases and update COGS

Monthly Tasks

• Categorize all Amazon fees from the monthly fee summary
• Reconcile advertising spend against your PPC reports
• Update inventory counts and adjust for damaged, lost, or returned items
• Review refund reports and ensure they are properly recorded
• Generate a profit and loss statement to assess monthly performance

Quarterly Tasks

• Estimate quarterly tax payments (federal and state)
• Review sales tax filing obligations and submit returns
• Audit your COGS calculations for accuracy
• Assess long-term storage fee exposure and plan inventory removal if needed

Annual Tasks

• Conduct a full inventory count (or reconcile Amazon's inventory report)
• Prepare year-end financial statements
• Gather all documentation for tax filing
• Review your chart of accounts and make adjustments for the coming year

Common Amazon Seller Accounting Mistakes

Avoiding these pitfalls will save you headaches—and potentially thousands of dollars:

Recording Net Deposits as Revenue

When Amazon deposits $10,000 into your bank account, that is not $10,000 in revenue. Your gross sales might have been $14,000, with $3,000 in fees and $1,000 in refunds. Always start with gross sales and deduct fees and refunds separately. This matters for accurate tax reporting and for understanding your true margins.

Ignoring Inventory Adjustments

Amazon regularly adjusts your inventory for damaged, lost, or customer-returned items. Some of these trigger reimbursements; others do not. If you are not tracking these adjustments, your inventory records will drift further from reality over time, and your COGS calculations will be inaccurate.

Mixing Personal and Business Finances

This is a fundamental rule that many new sellers break. Open a dedicated business bank account and business credit card. Use them exclusively for Amazon-related transactions. Commingling personal and business funds makes bookkeeping exponentially harder and weakens your legal protections if your business is structured as an LLC.

Neglecting to Save for Taxes

Amazon does not withhold income taxes from your settlements. As a self-employed seller (or business owner), you are responsible for making quarterly estimated tax payments. A common guideline is to set aside 25-30% of your net profit for federal and state income taxes plus self-employment tax.

Overlooking Deductible Expenses

Many Amazon sellers leave money on the table by failing to deduct legitimate business expenses. Beyond the obvious Amazon fees, do not forget:

• Home office deduction (if applicable)
• Product photography and graphic design
• Sample products for quality testing
• Business insurance premiums
• Professional development and training
• Mileage for business-related travel
• Software subscriptions (inventory tools, accounting software, research tools)

Scaling Your Accounting as You Grow

As your Amazon business grows, your accounting needs will evolve:

Under $100K in annual revenue: You may be able to manage bookkeeping yourself with disciplined processes and good tools. Invest time in learning the fundamentals now.

$100K-$500K in annual revenue: Consider hiring a bookkeeper who understands e-commerce. The complexity of multi-channel selling, inventory management, and sales tax compliance usually exceeds what most sellers can handle alongside running their business.

Over $500K in annual revenue: You likely need both a bookkeeper for day-to-day transaction recording and a CPA who specializes in e-commerce for tax strategy and planning. At this level, tax optimization strategies—such as entity structure changes, retirement account contributions, and cost segregation—can save significant money.

Multi-channel sellers: If you sell on Shopify, Walmart, eBay, or your own website in addition to Amazon, consolidated financial reporting becomes critical. Your accounting system needs to track revenue and expenses by channel while providing a unified view of overall business performance.

Keep Your Finances Organized from Day One

Whether you are launching your first product or managing a seven-figure Amazon business, clean bookkeeping is the backbone of smart decision-making. Every dollar tracked accurately is a dollar you can optimize, deduct, or reinvest with confidence.

Beancount.io offers plain-text accounting that gives you complete transparency and control over your financial data—no black boxes, no vendor lock-in. With version-controlled ledgers and an approach built for automation, it is the kind of tool that grows with your business. Get started for free and see why developers and finance professionals trust plain-text accounting for their most important numbers.