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FBA is convenient but expensive. FBM is cheap but hard to win Buy Box on. This breaks down which products belong where, the real fee math, and how to set both up inside Seller Central.
Who this is forNew and growing Amazon sellers deciding which products go FBA, which stay FBM, and how to set up the warehouse, shipping, and labeling for each. Especially relevant for sellers shipping over 100 units/month or expanding to multiple SKUs with different size/weight profiles.
What you'll need
Step 1
FBA: referral fee (8-15%) + FBA fulfillment fee ($3.22-$5.42/unit standard) + monthly storage ($0.87-$2.40/cubic foot). FBM: referral fee only.
FBA Standard Size fulfillment fee (2026): $3.22 (small/light) to $5.42 (large) per unit. Plus storage: $0.87/cu ft (Jan-Sep) and $2.40/cu ft (Oct-Dec).
FBA Oversize: $9.39-$158+ per unit. If your product is over 20 lbs or 18"x14"x8", FBA economics often break.
FBM: ONLY the referral fee (8-15% depending on category). You pay your own shipping, packaging, and labor.
Long-term storage fee: $6.90/cu ft per month for inventory aged 271-365 days, $0.15/unit minimum. Slow movers in FBA bleed margin.
New 2024+ fees: Inbound Placement Service Fee ($0.21-$1.95/unit) and Low-Inventory-Level fee ($0.89/unit if you fall below 28 days of cover). These are silent killers.
Step 2
Rule of thumb: high-velocity small items → FBA. Low-velocity bulky items → FBM. Items where you need brand-controlled packaging → FBM.
FBA wins when: product is under 2 lbs, sells 5+ units/week, doesn’t require gift wrap or branded inserts, has consistent demand.
FBM wins when: product is over 5 lbs, sells under 2 units/week, requires custom packaging/inserts, is fragile (Amazon’s warehouse damage rate is real), or has high seasonality.
Hybrid (both FBA and FBM on the same ASIN): sellers do this to keep listings live when FBA inventory runs out. The FBM listing kicks in as a backup. Costs nothing extra to enable.
Multi-Channel Fulfillment (MCF): you store inventory at FBA but use it to fulfill orders from your Shopify/site. Pricing: $7-18/order. Worth it if Amazon is 70%+ of revenue and you have one Shopify storefront.
Buy Box: FBA almost always wins Buy Box vs FBM at the same price because Amazon ranks fulfillment reliability. To win Buy Box on FBM, you need a 98%+ on-time rate AND a price ~3-5% lower than FBA competitors.
Step 3
Inventory → Manage All Inventory → select SKU → Edit → Fulfillment by Amazon → Convert. Then create an inbound shipment.
Open Inventory → Manage All Inventory.
Select the SKU you want on FBA. Click the dropdown next to it → "Change to Fulfilled by Amazon."
Amazon converts the listing in 5-10 minutes. The listing won’t show as in-stock until inventory arrives at the warehouse.
Next: Inventory → Manage FBA Inventory → "Send to Amazon" (the simplified workflow).
Specify quantity, packing type (case-packed = same SKU per box, individual = mixed), and ship-from address.
Amazon will assign you a Fulfillment Center destination (you don’t pick). Print FNSKU labels (unique Amazon barcode) and box labels. Ship via Amazon Partnered Carriers (UPS/Amazon LTL) for discounted rates.
Step 4
Settings → Shipping Settings → create shipping templates that match your real fulfillment speed. Lying about Standard vs Expedited triggers performance dings.
Settings (gear top-right) → Shipping Settings → "Shipping Templates."
Create one template per product weight class (light, medium, heavy). Don’t use one giant template.
Set Handling Time honestly. If you ship within 1 day, set it to 1. If you ship within 3 days, set it to 3. Missing the Handling Time window triggers Late Shipment Rate penalties (max allowed: 4%).
Use Amazon Buy Shipping (Orders → manage order → Buy Shipping). This auto-protects you in A-to-z claims because Amazon vouches for the label. Skipping Buy Shipping = manually defending every claim.
For products under 1 lb, USPS Ground Advantage via Amazon Buy Shipping is usually $4.50-6.80 per package. For heavier items, UPS Ground at Amazon negotiated rates beats your retail UPS rates by 20-40%.
Step 5
FBA: enable Distributed Inventory Placement (default) to spread across warehouses. Set Min Restock Alert to 28 days of cover to dodge Low-Inventory-Level fee.
Settings → Fulfillment by Amazon → Inbound Settings → Inbound Placement Service.
Three options: (a) Amazon-Optimized Distribution (default, $0.21-$1.95/unit), (b) Partial Shipment Splits ($0.30-$2.30/unit), (c) Minimal Shipment Splits ($0.41-$3.10/unit). For most sellers, (a) is cheapest.
Inventory → Inventory Planning → Restock Inventory. Set Min Restock Alert to your sales velocity × 28 days. This avoids the Low-Inventory-Level fee ($0.89/unit when you fall under 28 days of cover).
For FBM SKUs, set restock alerts in your own ops system (Cin7, Skubana, etc.) since Amazon doesn’t monitor FBM inventory levels.
Audit weekly: Reports → Fulfillment → FBA Inventory Age. Anything over 180 days needs to be liquidated, returned (Removal Order), or discounted aggressively. Long-Term Storage fees compound.
Step 6
Place a test order on each fulfillment method. Confirm delivery time, packaging quality, and that returns route correctly.
FBA test: buy your own product through Prime. Confirm it arrives in 2 days, Amazon packaging, no damage. If damaged, file Reimbursement claim immediately — set this expectation.
FBM test: place an order to a friend or warehouse. Confirm: shipping label printed correctly, tracking populated in Seller Central within 24 hours of ship, delivery within stated Handling Time + Transit Time.
Submit a test return (call it "Wrong size") to confirm the return label generates and the refund processes within Amazon’s 48-hour SLA. FBM returns require manual approval — make sure your team has a workflow.
Check Account Health (top nav) → Customer Service Performance → Late Shipment Rate, Pre-Fulfillment Cancel Rate, Valid Tracking Rate. All three must stay green.
Common mistakes
Defaulting everything to FBA
What goes wrong: Bulky, slow-moving SKUs accumulate Long-Term Storage fees ($6.90/cu ft/month) and Low-Inventory-Level fees. A single oversize SKU at 100 units sitting for 6 months can quietly burn $1,200 in storage + LTSF.
How to avoid: Run the FBA Revenue Calculator on every SKU. Anything where FBA fee + estimated storage > 35% of sale price should be tested as FBM. Most catalogs find 15-30% of SKUs are better off FBM.
Setting a 1-day Handling Time you can’t actually meet
What goes wrong: Late Shipment Rate climbs above 4%, Amazon throttles your account, you lose Buy Box. Worst case: account suspension. We’ve seen $50K/mo FBM sellers go from "Healthy" to "At Risk" in 14 days from this.
How to avoid: Set Handling Time to your true worst-case (usually 2-3 days for non-warehouse operators). Better to over-promise nothing and over-deliver — Amazon rewards consistency.
Ignoring Inbound Placement Service fees
What goes wrong: Sellers ship to one Amazon warehouse expecting to save money, but the new (2024+) Inbound Placement Service Fee adds $0.21-$3.10/unit depending on splits. On a 1,000-unit shipment, that’s $210-$3,100 not in last year’s budget.
How to avoid: Use Amazon-Optimized Distribution (the default, cheapest option). If you’re larger and want consolidation, factor IPSF into your landed cost — not just FBA fulfillment fee.
Not enabling FBM as a backup on FBA listings
What goes wrong: FBA stocks out → listing goes "Currently Unavailable" → you lose 5-21 days of sales velocity and the listing’s Buy Box positioning. Recovery takes 30-60 days. On a $10K/mo SKU, that’s $5-10K in lost sales.
How to avoid: Enable both fulfillment offers on the same ASIN. FBM kicks in automatically when FBA stocks out. Inventory → Add a Listing → select the same ASIN → choose "Merchant Fulfilled" as a secondary offer.
Skipping Amazon Buy Shipping for FBM orders
What goes wrong: When a customer files an A-to-z Guarantee claim (lost package, late delivery), Amazon defends YOU only if you used Buy Shipping. Without it, claims hit your ODR (Order Defect Rate) and you eat the refund. ODR over 1% = suspension risk.
How to avoid: Orders → manage order → Buy Shipping. Use this for every FBM order. Amazon Buy Shipping also gets you discounted carrier rates and auto-uploads tracking numbers.
Recap
Done — what's next
How to set up an Amazon Seller Central account
Read the next tutorial
Hand it off
The fulfillment-mix decision is per-SKU and changes as your catalog scales. Most $500K+ Amazon sellers run a 70/30 or 60/40 FBA/FBM mix and reconfigure quarterly. An Amazon specialist will run the FBA Revenue Calculator across your catalog, model the right mix, and set up the workflow to keep it tuned. Starting at $14-16/hr — typical Amazon engagements run $800-2,400/mo.
See Amazon specialist rates
When (FBA fulfillment fee + estimated storage + IPSF) exceeds the cost of you fulfilling the same order. Practical rule: products under 1 lb and selling 5+ units/week are almost always FBA. Products over 5 lbs selling under 2 units/week are almost always FBM. Everything between needs FBA Revenue Calculator analysis.
Yes — reviews are tied to the ASIN, not the fulfillment method. Change the offer in Inventory → select SKU → "Change to Merchant Fulfilled." Your review history transfers immediately. Buy Box positioning may shift, but ratings stay.
Three strategies: (1) Send smaller, more frequent shipments — only 30-60 days of cover at a time. (2) Use Amazon’s Removal Order feature in Q3 to pull aged inventory before the Q4 storage rate kicks in ($2.40/cu ft Oct-Dec). (3) Liquidate aged inventory through Outlet Deals or 50%+ Lightning Deals before day 271 to dodge Long-Term Storage Fee.
Not automatically, but FBA gets significant Buy Box weight from Amazon’s ranking algorithm because fulfillment reliability scores high. An FBA seller at $19.99 will usually win Buy Box over an FBM seller at $19.99 — the FBM seller typically has to be 3-5% cheaper AND maintain a 98%+ on-time rate to compete.
Once you hit 30+ FBM orders/day, a 3PL (ShipBob, ShipMonk, ShipHero) typically beats in-house on per-unit cost AND on Handling Time consistency. 3PLs also handle Buy Shipping via Amazon’s API. Below 30 orders/day, in-house with Amazon Buy Shipping is usually cheaper.
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