Amazon Commingling Program Ends March 2026: What Every Seller Must Do Now

Amazon's commingling program — the practice of pooling identical products from different sellers in the same fulfillment center bin — officially ends on March 31, 2026. If you sell through FBA and haven't taken action yet, now is the time to understand what's changing and update your fulfillment workflow before disruptions hit your account.

What Was Commingling, and Why Is Amazon Ending It?

Under the old commingling system, Amazon treated products with the same manufacturer barcode (UPC, EAN, ISBN) as interchangeable. When a customer ordered your product, Amazon might ship a unit that was originally sent in by a completely different seller. The logic was efficiency: ship from whichever unit is closest to the customer.

The problem was trust. Commingling made it nearly impossible to trace the origin of defective or counterfeit units. Brand owners reported receiving negative reviews and A-to-Z claims for products they never actually shipped. Amazon estimated that brand owners collectively spent over $600 million per year on re-stickering inventory with FNSKU labels — a workaround to opt out of a system that shouldn't have required opting out of in the first place.

Two factors made the change possible. First, Amazon's logistics network has matured to the point where most sellers maintain enough distributed inventory to achieve fast delivery without pooling. Second, virtual tracking technology now allows Amazon to trace individual units through the fulfillment chain, eliminating the operational need for physical pooling.

How the New Rules Work: Brand Owners vs. Resellers

The impact depends on your role in Amazon's ecosystem, and the difference is significant.

If you're a Brand Owner with Brand Representative status in Brand Registry, you're getting more flexibility, not less. After March 31, your products with valid manufacturer barcodes (UPC, ISBN, etc.) will no longer require FNSKU stickers to prevent commingling. Since there's no more commingling to prevent, your manufacturer barcode is sufficient. This simplifies your prep workflow and reduces per-unit costs — you no longer need to pre-allocate units specifically for Amazon versus other channels.

If you're a Reseller or a seller without Brand Representative status, the rules tighten considerably. Every unit you send to FBA must carry an Amazon barcode label (FNSKU) — no exceptions. After March 31, any inventory arriving at fulfillment centers without proper FNSKU labeling will be classified as "defective." That means delayed processing, potential removal fees, and lost sales while your units sit in limbo.

An important detail that many sellers overlook: the March 31 deadline applies to when shipments arrive at fulfillment centers, not when they're created. A shipment you create on March 25 that arrives on April 3 must comply with the new FNSKU requirements.

Action Steps to Take Right Now

Whether you're a brand owner or a reseller, here's what to do before your next FBA shipment.

Step 1: Confirm your Brand Registry status. Log into Brand Registry and verify you hold the Brand Representative role. If you're listed as an Authorized Agent or Registered Agent, the full brand-owner benefits don't apply — you'll need FNSKU labels.

Step 2: Audit your current labeling workflow. Check your active FBA listings to see which are set to "Manufacturer Barcode" vs. "Amazon Barcode" fulfillment. If you're a brand owner, you can now simplify by defaulting to manufacturer barcodes across the board. If you're a reseller, confirm that every SKU is configured for Amazon Barcode and that your prep process includes FNSKU labeling.

Step 3: Update your prep service instructions. If you use a third-party prep center, notify them about the policy change. Prep centers that previously handled stickerless inventory for brand owners may need to adjust their workflow. Resellers should confirm that their prep centers are applying FNSKU labels to every unit without exception.

Step 4: Review inbound shipments in transit. Any shipments created before March 31 but arriving after must meet the new requirements. If you have pending shipments that don't comply, consider recalling or re-routing them for relabeling.

Step 5: Monitor your Account Health dashboard. After April 1, watch for any new policy compliance warnings related to inventory labeling. Amazon may flag existing inventory that was commingled under the old system — understanding these alerts early prevents escalation.

What This Means for Product Quality and Brand Protection

For brand owners, this is one of the most positive policy changes in years. Commingling was the root cause of some of the most frustrating marketplace issues: counterfeit units mixed with authentic inventory, quality control complaints triggered by other sellers' substandard products, and the inability to trace exactly which seller shipped a problematic unit.

With commingling gone, every unit in Amazon's fulfillment network will be traceable to its source seller. This means more accurate quality attribution, cleaner review profiles, and stronger brand protection. If you've been dealing with unexplained negative reviews or authenticity complaints, you should see improvement over the coming months as legacy commingled inventory cycles out of the system.

How SellerMage Can Help

Navigating policy transitions like this is exactly what our account management team handles for clients every day. We're currently helping sellers audit their inventory configurations, update labeling workflows, and ensure compliance before the deadline creates operational disruptions.

If you want a free assessment of how the commingling change affects your specific catalog, contact our team for a no-obligation account review.