How should you compare Amazon MCF with a 3PL?
Compare both options against the same SKU, destination zones, units per order, delivery promise, return process, and monthly volume. Amazon Multi-Channel Fulfillment uses eligible FBA inventory to fulfill orders from your website and other sales channels, so the decision affects both fulfillment cost and the inventory available for Amazon orders.
Do not compare one advertised per-unit rate with a blended 3PL invoice. Model every recurring, per-order, inventory, exception, and integration cost, then measure actual delivery and contribution in a controlled pilot.
Build a like-for-like fulfillment cost table
- Pick, pack, shipment, additional-unit, oversized-item, and delivery-speed charges for the exact order profile.
- Inbound transportation, preparation, labeling, receiving, storage, and inventory-aging costs.
- Account, software, integration, minimum-volume, project, and support fees.
- Returns, address corrections, cancellations, split shipments, lost units, and customer-service labor.
- Any current peak, fuel, logistics, or other temporary surcharge shown in the live rate card.
Protect the shared inventory pool
Forecast Amazon demand and off-Amazon demand separately, then reserve a service-level buffer for the channel with the highest stockout cost. One pooled inventory position can reduce duplicated stock, but an external promotion can also consume units needed to keep the Amazon offer available.
Test SKU eligibility, packaging, integrations, order import, tracking export, and cancellation timing before routing meaningful volume. Keep an exception queue for orders that fail to import, cannot be fulfilled, or require a delivery service that the selected route does not support.
Run a controlled service and margin pilot
- Select a stable set of SKUs and destinations rather than moving every order at once.
- Measure fulfillment cost per shipped order and per delivered unit, not only the quoted base rate.
- Track promised versus actual delivery, cancellation, damage, loss, return, and support-contact rates.
- Calculate contribution per order after fulfillment, storage allocation, returns, and acquisition cost.
- Set minimum margin and service thresholds before the pilot starts, plus a route-back rule for exceptions.
Decide by order segment, not one blended average
MCF may be the better route for one size tier, destination, delivery promise, or sales channel while a 3PL remains better for another. Keep the winning rule at the order-segment level and recheck it after packaging, volume, destination mix, or carrier performance changes.
Amazon currently describes MCF as using one FBA inventory pool for multiple sales channels, with rates covering picking, packing, and shipping. Available speeds, countries, integrations, discounts, eligibility, and surcharges can change, so verify the current MCF pricing and your account-specific order estimate before expanding.