Here's the mistake almost every new Amazon seller makes: they see a product selling for $29.99, find it on Alibaba for $5, and think they're staring at a $25 profit margin.
They're not. After Amazon's fees, they might clear $8. Maybe less.
Understanding what Amazon actually takes — before you order inventory — is the single most important calculation in this business. Let's break it down.
The 4 Fees Every FBA Seller Pays
1. Referral Fee (8%–15% for most categories)
Amazon charges a percentage of every sale as a referral fee. Think of it as Amazon's commission for letting you sell on their platform.
For most categories — home goods, sports, toys, kitchen — it's 15%. Some categories are lower: electronics accessories often run 8%. A few specialty categories hit 20%+.
On a $29.99 sale at 15%: $4.50 goes to Amazon immediately.
2. FBA Fulfillment Fee (per unit shipped)
This is what Amazon charges to pick, pack, and ship your product from their warehouse. It's based on size and weight — not your selling price.
A standard small item (under 1 lb, fits in a shoebox): roughly $3.06–$3.31 per unit in 2026.
A larger item (2–3 lbs): expect $5.00–$6.50 per unit.
That same $29.99 product? Add another $3.31 out the door.
3. Storage Fees (monthly, per cubic foot)
Amazon charges you to store your inventory in their warehouses. Rates change by season:
- January–September: ~$0.78/cubic foot/month
- October–December (peak): ~$2.40/cubic foot/month — 3× more expensive
A slow-moving product sitting in Amazon's warehouse during Q4 can quietly drain hundreds of dollars. This is why velocity matters as much as margin.
4. Inbound Placement Fee (newer — easy to miss)
Since 2024, Amazon charges sellers to place inventory near customers. If you don't pay to split your shipment, Amazon will distribute it themselves — and charge you for the privilege.
For a standard-size product, this typically runs $0.27–$1.58 per unit depending on the shipment type you choose. Small, but it adds up on every replenishment order.
The fees most beginners forget: Referral fee + Fulfillment fee alone often consume 35–45% of your selling price before you've counted product cost, advertising, or shipping to Amazon.
What Real Profit Looks Like
Let's run the honest math on a $29.99 product. Say it costs you $5 landed (product + shipping from supplier to Amazon).
- Selling price: $29.99
- Referral fee (15%): −$4.50
- FBA fulfillment fee: −$3.31
- Inbound placement fee: −$0.50
- Storage (estimated per unit): −$0.30
- Product cost (landed): −$5.00
- Gross profit before ads: $16.38
That's a 54% margin before advertising. Sounds decent — until you factor in PPC. A realistic ad spend for a competitive product runs 15–25% of revenue.
At 20% TACoS: subtract another $6.00. Real profit: ~$10.38 per unit.
Still profitable — but a very different picture than the $25 a lot of beginners imagine when they first run the numbers.
The Products That Look Good But Aren't
Certain product types get crushed by fees before they even start:
- Low-priced items ($9.99 and under): The fulfillment fee alone eats 30%+ of revenue. Amazon's minimum fulfillment fee doesn't scale down with price.
- Heavy or oversized items: Fulfillment fees jump sharply. A 5 lb product can hit $8–10 in fulfillment fees alone.
- Slow-moving seasonal products: Storage fees compound month after month. A product that doesn't sell during peak season can cost more to store than it makes.
Rule of thumb: For FBA to make sense, most sellers target a minimum selling price of $18–$25+. Below that, fees leave very little room for error.
How to Run the Numbers Before You Buy
Amazon has a free tool called the Revenue Calculator inside Seller Central. Plug in any ASIN, enter your product cost, and it shows you the actual fee breakdown and estimated profit.
Use it on every product before you commit to inventory. Not after.
Also factor in:
- Return rate (2–5% for most products, higher for apparel/electronics)
- Amazon's removal/disposal fee if inventory goes unsold
- Any prep or labeling costs before sending to Amazon
The Takeaway
Amazon FBA is a real business with real costs. The sellers who build sustainable margins aren't the ones who found cheaper products — they're the ones who ran the honest math first and only moved forward when the numbers actually worked.
Today's action: Pull up Amazon's FBA Revenue Calculator and run the real numbers on your next product idea before you spend a dollar on inventory. If the margin doesn't survive a 20% ad cost, keep looking.
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