By March 31, 2026, Amazon FBA sellers will cross a hard operational line.
The era of commingled (shared) inventory officially ends, replaced by strict physical inventory isolation and mandatory item-level identification. For many sellers, this is not a cosmetic policy update—it fundamentally changes how inbound shipments, removals, and prep must be executed.
At MoRo Prep, a ground-based FBA prep facility in St. Thomas, Ontario, we have already seen a sharp increase in removal orders, relabeling requests, and rejected inbound shipments tied directly to these changes.
This article explains what actually changes on March 31, why it matters operationally, and how sellers can avoid disruption.
What Changes on March 31, 2026?
Amazon is enforcing a clear separation in how inventory is identified, stored, and traced.
1. The End of Commingled Inventory
Identical products from different sellers will no longer be mixed. Every unit must now be physically traceable to a single seller inside Amazon’s network.
This eliminates any tolerance for ambiguity at receiving docks. Units without correct identification are more likely to be rejected or flagged for unplanned services.
2. Mandatory FNSKU for Resellers
If you are a reseller or distributor, every unit must carry an Amazon barcode (FNSKU)—even if the product already has a manufacturer UPC.
Only registered Brand Owners may continue using manufacturer barcodes directly.
For sellers shipping into YYZ1, YYZ4, YYZ7, or YYC4, this means labeling volume and precision requirements increase immediately.
Why This Is an Operational Risk (Not Just a Policy Update)
Amazon discontinued its own internal prep services on January 1, 2026. Labeling, bagging, and item prep are no longer handled at the FBA dock.
As a result:
- Incorrect or missing labels are no longer “fixed downstream”
- Inbound errors now result in rejections, delays, or high unplanned service fees
- Removal orders arriving without relabeling capacity stall inventory recovery
This is where many sellers encounter friction—not in Seller Central, but on the warehouse floor.
How MoRo Prep Handles the 2026 Prep Shift
Our St. Thomas facility operates as a service-only, neutral prep partner, focused exclusively on execution accuracy.
High-Volume FNSKU Relabeling
All inbound and removal inventory is verified using handheld scanning terminals. Each FNSKU is matched against SKU lists before application to prevent cross-labeling errors.
Strategic Proximity to YYZ Clusters
Located centrally in Ontario, we receive removals and reship to YYZ1, YYZ4, and YYZ7 within a typical 24–48 hour turnaround, reducing dwell time and storage exposure.
Neutral, Compliance-First Operations
We do not sell products on Amazon. Inventory handling, documentation, and prep workflows are designed solely around seller compliance and traceability, not resale.
Practical Action Steps for Resellers
If you are affected by the March 31 changes, the following actions are time-sensitive:
- Audit Your Barcode Preference
Check FBA Product Barcode Preference in Seller Central to confirm whether FNSKU labeling is required. - Externalize Prep Before the Rush
With Amazon no longer offering prep services, securing a locally registered 3PL before the March 31 demand surge reduces risk. - Clear or Rework Aged Inventory
Relabeling is often the cleanest path to restoring removals or repositioning inventory under the new rules.
A Ground Team Matters in 2026
As Amazon tightens physical inventory controls, execution errors are less forgivable—and harder to reverse.
If you need local, compliant FNSKU relabeling or removal prep in Ontario, our St. Thomas facility supports sellers navigating these changes with direct, hands-on operations.
For facility details and reseller-focused FNSKU compliance support,
visit our FNSKU Relabeling Service page.
MoRo Prep
St. Thomas, Ontario
Physical warehouse. Ground execution. No intermediaries.