FBA Accounting Fundamentals
FBA (Fulfillment by Amazon) is simple operationally—send products to Amazon's warehouse and let them handle everything. But accounting-wise, FBA is complex. Amazon's payouts are net amounts (after all fees and adjustments), meaning you never see the full sales revenue or itemized deductions. Without proper FBA accounting, you'll never know your true profitability, overpay taxes, and miss opportunities to optimize costs. This guide walks through the complete FBA accounting framework.
FBA Fee Categories You Must Track
| Fee Type | Description | Accounting Treatment | How to Find It |
|---|---|---|---|
| Referral Fee | Amazon's commission (5-45% depending on category) | Operating expense | Payments Report - Service Fees |
| Fulfillment Fee | Per-unit FBA packing, shipping, handling | Operating expense | Payments Report - Fulfillment Fees |
| Storage Fee | Monthly warehouse space (Jan-Sept or Oct-Dec rates) | Operating expense | Payments Report - Storage Fees |
| Long-Term Storage | 365+ day inventory ($6.90/cu ft annually) | Operating expense | Payments Report - Long-Term Storage |
| Returns Credit | Refund issued to customers | Reduces revenue (negative sale) | Payments Report - Returns |
| Removal Fee | Cost to remove unsellable inventory | Operating expense (or COGS if product defective) | Payments Report - Removal Fees |
| Advertising Costs | Sponsored Products, Brand ads | Marketing expense | Advertising Dashboard - Campaign Summary |
Step-by-Step FBA Accounting Process
Record Gross Sales
When: When customer places order (accrual accounting)
Journal Entry:
Dr. Accounts Receivable / Bank $10,000
Cr. Sales Revenue $10,000
Example: Customer buys 5 units at $2,000 each = $10,000 gross sale recorded immediately (not when you get paid).
Record Cost of Goods Sold
When: Same day as sale (accrual method)
Journal Entry:
Dr. COGS $5,000
Cr. Inventory $5,000
Example: 5 units cost $1,000 each = $5,000 COGS. Reduces inventory, increases COGS expense.
Record Amazon Fees Payable
When: Sale date (accrue fees even if not immediately deducted)
Journal Entry:
Dr. Referral Fee Expense $1,500
Dr. Fulfillment Fee Expense $750
Cr. Fees Payable to Amazon $2,250
Example: 15% referral + 7.5% fulfillment = 22.5% total fees. On $10,000 sale = $2,250 in fees.
Record Amazon Payout
When: Payment received to bank (every 14 days typically)
Journal Entry:
Dr. Bank Account $7,250
Cr. Amazon Settlement Payable $7,250
Example: $10,000 gross - $2,250 fees - $500 other adjustments = $7,250 net payout.
Account for Returns/Refunds
When: Refund issued to customer
Journal Entry:
Dr. Sales Returns $2,000
Cr. Accounts Receivable $2,000
Dr. Inventory $1,000
Cr. COGS $1,000 (reverse COGS for returned units)
Example: Customer returns 1 unit ($2,000 refund). Adjust sales down and inventory/COGS back up.
Monthly FBA Accounting Checklist
Follow this process every month to stay on top of FBA accounting:
- Download Reports: Get Sales & Traffic Report and Payments Report from Seller Central for the month
- Reconcile Sales: Verify total units sold matches your records. Investigate discrepancies.
- Extract Fees: Filter Payments Report by fee type (Referral, Fulfillment, Storage, Returns, etc.)
- Record Transactions: Enter all sales, COGS, fees, and payouts into accounting software (QuickBooks, Xero, FreshBooks)
- Verify Deposits: Confirm Amazon payouts match bank deposits. Account for timing differences (deposits clear 1-2 days after processing)
- Audit Fees: Check for overcharges, duplicate fees, or calculation errors. Amazon occasionally makes mistakes.
- Review P&L: Generate Profit & Loss statement. Compare to prior months. Identify trends (rising fees, falling margins, etc.)
FBA Accounting Software & Tools
Manual Excel accounting works for small sellers, but as volume grows, software saves time and prevents errors:
| Software | Best For | Cost | Integration |
|---|---|---|---|
| Link My Books | Automated Amazon reconciliation | $99-299/month | QuickBooks, Xero |
| QuickBooks Online | Complete accounting system | $30-250/month | Integrates with 400+ apps |
| Xero | Cloud accounting for e-commerce | $13-80/month | Integrates with Link My Books |
| A2X Accounting | Automated FBA & e-commerce accounting | $199-499/month | QuickBooks, Xero, Sage |
| Helium 10 - Profit | Amazon-specific profitability tracking | $99-399/month | Standalone or with QuickBooks |
Finding FBA Fee Overcharges
Amazon occasionally overcharges or double-bills sellers. You can often recover thousands in refunds:
- Storage Fee Audit: Amazon sometimes charges peak-season rates when items were in regular season. Request refunds for mischarges.
- Duplicate Fees: Check if items were charged fulfillment fees AND removal fees. Usually only one applies.
- Long-Term Storage Errors: Verify LTS dates are accurate. Items sometimes wrongly flagged as 365+ days old.
- Fulfillment Fee Mistakes: Compare actual unit weight to what Amazon charged. Oversize classification errors are common.
- Refund Fee Issues: When customers return items, Amazon should credit you the fulfillment fee. Verify this credit appears.
Tools that help: Getida, Helium 10 Refund Genie, and FlatFile all audit FBA charges and recover overcharges (take 25-40% commission on recovered amounts).
Common FBA Accounting Mistakes
- Recording Only Net Proceeds: If Amazon deposits $6,500, recording only that misses the $10,000 sale and all itemized fees. Always record gross sales + itemized fees separately.
- Mixing COGS with FBA Fees: FBA fulfillment fees are operating expenses, not COGS. COGS is only the product cost itself.
- Not Accruing Fees: If using accrual accounting (required for tax purposes if revenue >$25M), accrue fees on sale date, not payout date.
- Ignoring Q4 Storage Surges: October-December storage rates triple. Budget accordingly. Many sellers get shocked by Q4 storage charges.
- Not Tracking Returns Properly: Each return reverses the original sale AND COGS. Failure to reverse COGS inflates profits.
Real FBA Accounting Example
Scenario: You sell 50 units of a product at $100 each in November. COGS is $30/unit. 15% referral fee, $2.92 fulfillment fee/unit.
Transactions:
- Sale recorded: Dr. Bank $5,000 / Cr. Sales Revenue $5,000
- COGS recorded: Dr. COGS $1,500 / Cr. Inventory $1,500
- Referral fee ($5,000 × 15%): Dr. Referral Fee $750 / Cr. Fees Payable $750
- Fulfillment fee (50 × $2.92): Dr. Fulfillment Fee $146 / Cr. Fees Payable $146
- Amazon payout: Dr. Bank $3,604 / Cr. Amazon Settlement Payable $3,604
P&L Result:
- Sales Revenue: $5,000
- Less: COGS: ($1,500)
- Gross Profit: $3,500
- Less: Referral Fees: ($750)
- Less: Fulfillment Fees: ($146)
- Net Profit: $2,604
Note: Amazon payout was $3,604, but net profit is $2,604 (difference is the $1,000 in COGS already spent).