The Complete Amazon FBA Fee Structure (2026)
Amazon FBA now has more fee layers than ever. Most sellers correctly account for referral and fulfillment fees — but miss inbound placement fees, the 2026 low-inventory surcharge, Q4 storage spikes, and the true per-unit cost of their return rate.
| Fee Type | Rate / Amount | Notes |
|---|---|---|
| Referral Fee | 15% of selling price | Most categories; 8% electronics, 17% clothing |
| FBA Fulfillment Fee | $3.06–$13.08+ | Based on size tier and weight |
| Inbound Placement Fee | $0.27–$1.58/unit | 2024–2026; waived for multi-warehouse splits |
| Low-Inventory Fee | $0.08–$0.89/unit | Applied when stock < 28-day historical demand |
| Monthly Storage (Jan–Sep) | ~$0.78/cu ft | Standard size; per-unit depends on dimensions |
| Monthly Storage (Oct–Dec) | ~$2.40/cu ft | Q4 surcharge — 3× regular rate |
| Aged Inventory Surcharge | $0.50–$6.90/cu ft | 181–365+ days aged |
| Returns Processing | $2.12–$12.58/return | Varies by size tier |
| Total Estimated (on $50 product) | $13–$19 | Before PPC; 26–38% of selling price |
The 2026 Low-Inventory Fee: New Tax on Understocking
Amazon introduced the low-inventory fee to incentivize sellers to maintain adequate stock levels. If your on-hand inventory covers less than 28 days of demand based on historical sales, Amazon charges an additional per-unit fee on every outbound shipment.
If you sell 10 units/day, you need 280+ units on hand to avoid the fee.
At 200 units on hand: $0.08–$0.89 extra per unit shipped.
This creates a paradox for capital-efficient sellers: keeping lean inventory to reduce storage costs now triggers a low-inventory fee that often costs more than the storage savings. The calculator defaults to $0.08/unit — the lowest tier — but sellers with faster-moving products may face $0.32 or $0.89/unit.
Q4 Storage: The Holiday Margin Trap
Amazon's October–December storage rate is roughly 3× the standard rate. Sending 1,000 units into FBA in August at $0.78/cu ft and not selling them through October means you're now paying $2.40/cu ft on the same inventory. Toggle the Q4 switch in the calculator to see exactly what this does to your per-unit economics.
FBA Size Tier Fulfillment Fees
Returns: The Math No One Talks About
The 2026 industry average FBA return rate is 16.9%. That means roughly 1 in every 6 orders is returned. The true cost of a return is not just the lost revenue — it's the original FBA fulfillment fee (non-refunded), the returns processing charge Amazon adds, and the cost of the inventory if it can't be resold.
+ COGS (if unsellable) + Lost Profit
At 16.9% return rate and $15 profit/sale:
Returns cost allocated per sale = (0.169 × return cost) ÷ (1 − 0.169)
This equals roughly $3.05/sale in return overhead — eating 20% of your profit.
Use the returns slider in the calculator above. At 16.9%, you'll see the visualizer display how many green "winning" sales are needed to offset one losing return. For most FBA products at typical margins, that answer is 4–6 sales.
Compare FBA Against Every Other Platform
The FBA estimator above models one product. The full TrueMargin tool compares Amazon, Shopify, TikTok Shop, Etsy, and more — side by side, including LTV modeling and inventory cash flow projections.
Open Full Profit CalculatorFree · No credit card · Results in 60 seconds