Amazon FBA sellers consistently underestimate total fees by 30-50% in their initial projections. The referral fee is obvious; the storage fees, return fees, removal fees, and advertising costs are not.
Here's the complete fee breakdown and what sellers are actually netting in 2025.
The Full Amazon FBA Fee Stack
For a typical $29.99 product (1 lb, small standard size):
| Fee type | Amount | % of sale price |
|---|---|---|
| Referral fee (15% typical) | $4.50 | 15.0% |
| FBA fulfillment fee | $3.22 | 10.7% |
| Monthly storage (per unit) | $0.35-0.95 | 1.2-3.2% |
| Inventory placement fee | $0.27 | 0.9% |
| Returns processing (est.) | $0.50 | 1.7% |
| Total Amazon fees | $8.84-9.44 | 29.5-31.5% |
Before COGS or advertising, Amazon takes roughly 30% of your sale price.
After All Costs: Real Margin Data
For a product selling at $29.99 with 3x landed cost of goods:
| Cost component | Amount |
|---|---|
| Sale price | $29.99 |
| Amazon fees | -$9.20 |
| Cost of goods | -$10.00 |
| PPC advertising (est. 15% ACoS) | -$4.50 |
| Miscellaneous (photography, prep) | -$0.80 |
| Net profit per unit | $5.49 |
| Net margin | 18.3% |
18% sounds decent — until you factor in the cost of capital tied up in inventory and the risk of returns, damaged goods, and storage fees on unsold units.
Advertising: The Hidden Destroyer of Margin
New sellers frequently discover that launching without advertising means zero visibility. Amazon's algorithm rewards advertising spend.
Average Advertising Cost of Sale (ACoS) by category:
| Category | Average ACoS | Healthy target |
|---|---|---|
| Home & Kitchen | 28% | < 20% |
| Sports & Outdoors | 32% | < 22% |
| Health & Household | 35% | < 25% |
| Beauty & Personal Care | 38% | < 28% |
| Electronics | 25% | < 18% |
| Clothing | 42% | < 30% |
An ACoS of 35% means you're spending $3.50 in ads for every $10 of revenue. In a category where your total margin (before ads) is 45%, ACoS of 35% leaves you with 10% net. Add returns, storage, and Amazon's inevitable fee increases and you're looking at 3-7% net margin — or negative.
The Products That Work vs. Those That Don't
Products with sustainable FBA margins:
- High price point ($40-150) with low weight and small dimensions
- Proprietary brand with repeat buyers
- Bundled products (higher ASP, same fulfillment cost)
- Supplements (high margin, compact)
Products that are FBA traps:
- Price under $15 (fees consume too much of sale price)
- Heavy items over 3 lbs (fulfillment fees spike)
- Oversized items (storage fees are 3-4x higher)
- Any product with high return rates (electronics, clothing)
2025 Fee Changes to Know
Amazon raised FBA fees in February 2025:
- Standard-size items under 1 lb: up 5-8%
- Oversized items: up 10-15%
- Storage fees for Q4 (Oct-Dec): up 20% vs. prior year
Sellers who haven't repriced since late 2024 may be operating at margins 3-8 points lower than they think.
Use the Amazon FBA Calculator to model your exact product's true net margin before you commit to inventory.