If you sell on Amazon, you've faced this decision: Fulfilled by Merchant (FBM) or Fulfilled by Amazon (FBA)? Most sellers default to FBA without fully understanding what they're giving up — or when FBM is actually the smarter choice. Here's how to think through it clearly.
What FBA Actually Is (and What It Costs You)
With FBA, you ship inventory to Amazon's warehouses and Amazon handles storage, packing, shipping, and customer service. Your listings get the Prime badge, which improves conversion. You also win the Buy Box more consistently.
But FBA comes with real costs that eat into your margins: fulfillment fees, monthly storage fees, long-term storage fees, removal fees, and a complex reimbursement system when Amazon loses or damages your inventory. For slow-moving, oversized, or seasonal products, FBA can quietly destroy profitability.
What FBM Actually Is (and When It Wins)
With FBM, you store and ship your own inventory — either directly or through a 3PL. You control the packaging, the timing, and the customer experience. There's no storage fee, no long-term storage penalty, and no surprise removal order from Amazon forcing you to liquidate at a loss.
FBM wins clearly in these situations:
- Heavy or oversized items — FBA fulfillment fees for large items can exceed $20–40 per unit
- Slow-moving SKUs — inventory sitting in FBA warehouses past 180 days incurs escalating long-term storage fees
- Products with high return rates — FBA return processing can damage or destroy items you could have refurbished yourself
- Custom or branded packaging — FBA requires specific prep that removes your brand experience from the unboxing
- Sellers with their own logistics operation — if you have a 3PL with competitive rates, FBM margins can exceed FBA
The Real Comparison: FBA vs FBM on a $35 Product
| Cost Factor | FBA | FBM via 3PL |
|---|---|---|
| Fulfillment fee | $4.75 | $3.20 (3PL rate) |
| Monthly storage (per unit) | $0.75–$2.40 | Included in 3PL contract |
| Prime eligibility | Automatic | Seller Fulfilled Prime (application required) |
| Buy Box advantage | Strong | Moderate |
| Returns processing control | Amazon controls | You control |
| Inventory visibility | Amazon dashboard | Real-time 3PL system |
The Hybrid Approach: Use Both
The smartest Amazon sellers run both FBA and FBM simultaneously on the same listing. This protects you when FBA stock runs out, gives you a backup if Amazon restricts inbound shipments, and lets you test which fulfillment method wins the Buy Box for your specific category.
Many experienced sellers keep their top 20% of SKUs (fast-moving, small, high-margin) in FBA and manage the rest through FBM or a 3PL.
FBA is not the default right answer. It's the right answer for fast-moving, small, high-margin products where Prime conversion matters. For everything else, run the numbers against your actual 3PL rates before assuming FBA wins.
How TLT Commerce Group Can Help
We manage Amazon FBA and FBM operations for brands and Chinese manufacturers entering the U.S. market. Our Los Angeles 3PL is specifically built to support FBM fulfillment at competitive rates — giving you the flexibility to run both channels simultaneously without overcommitting inventory to Amazon.
- Amazon Seller Central and Vendor Central (1P and 3P) management
- FBA prep, labeling, and inbound shipment management
- FBM fulfillment from our 300,000 sq ft Los Angeles 3PL
- Hybrid strategy setup — FBA for fast movers, FBM for everything else
- Buy Box optimization and listing management across all SKUs