Amazon commingled inventory: what ended in March 2026, and the barcode rules now

Amazon defines commingling as fulfilling customer orders using exact product matches from the closest available inventory, even if that inventory belonged to a different seller, to achieve faster delivery. Sellers who sent products with the manufacturer's barcode, such as a UPC, rather than an Amazon barcode had their units tracked by that shared barcode, so identical units from several sellers were interchangeable.

Commingled inventory was also called stickerless inventory, because sellers did not have to put an Amazon label on each unit. The tradeoff was control: a customer who bought from you could receive a unit another seller had sent in. Amazon's reason for ending it is simple: now that most sellers keep stock close to customers, it says fast delivery no longer depends on commingling.

Commingling saved sellers time: no label on each unit, and identical products from every seller shipped from whichever fulfillment center was closest. The cost was control over product quality. When units were pooled by manufacturer barcode, a counterfeit, damaged or used unit sent in by one seller could reach another seller's customer, and the complaint, return or negative feedback landed on the seller account that made the sale.

Sellers in Amazon's own forum thread on the change describe exactly that: authenticity complaints and returns traced to stock that was never theirs. Amazon's stated reasons are about tracking. Its FAQ says Amazon barcodes help maintain clear inventory separation and product traceability for all FBA sellers, so each seller's items can be tracked separately from other sellers' inventory of the same product.

Amazon announced in its Seller Forums that commingling practices would end for inventory shipped on or after March 31, 2026, and updated its Seller Central help to match. Its FBA Barcode Choice and Labeling FAQ says the change means customers who buy from you will only receive products from your inventory, including returns and removals. It is one of several 2026 changes collected in our Amazon seller news roundup.

For brand owners, the end of commingling is a gain. Amazon says brand representatives no longer need Amazon barcode stickers to prevent commingling for products that already have manufacturer barcodes, which means they do not have to set aside units for Amazon or other channels.

Amazon lists three advantages of manufacturer barcodes: no cost of creating and applying unique labels, the same inventory usable across Amazon stores and other channels, and products that keep their identity through fulfillment.

Eligibility has two conditions. The product must have a single, scannable UPC, EAN or ISBN barcode matching a single ASIN in Amazon's catalog, and it must belong to a brand enrolled in Brand Registry where you are a brand representative. Amazon adds that enrolling a brand does not connect your products to it automatically; you have to register the products to your brand.

For resellers, including wholesale and arbitrage sellers, the rule is now strict. Amazon's FAQ says all resellers, including authorized resellers of the brand, must use Amazon barcodes when sending inventory, even for products with a manufacturer barcode. Amazon explains that brand owners are exempt because they have direct responsibility for their products' quality and authenticity and buy their GTINs from GS1.

Amazon barcodes are the X00 labels, also called FNSKU labels, that you print from Seller Central. Resellers who already used them can keep their process. Those who shipped stickerless before need new offers with Amazon barcodes; Amazon says creating a new SKU does not affect product reviews, which belong to the ASIN, or your seller feedback.

Amazon says reseller inventory received without Amazon barcodes after March 31, 2026 is considered defective. Amazon will try to correct the labeling and notify you through the Inbound Performance Dashboard, but it warns that such units may be hard to track in your account, and units not labeled to its requirements are not eligible for reimbursement.

That last point matters more than the defect notice. If a mislabeled unit is lost or damaged in the fulfillment network, you cannot claim it back. Our guide to Amazon reimbursement covers the claim rules.

For resellers, labeling is now a fixed cost per unit, like prep, and a time cost on every shipment. Build it into landed cost before you buy, and decide who applies labels: you, your supplier, or a prep center. Many suppliers can apply FNSKU labels before shipping if you send the label files with the purchase order.

For brands, the question is the reverse: are your products actually registered to your brand in Brand Registry, and do their barcodes each match a single ASIN? Products that fail either check still need Amazon barcodes. An audit of the catalog, product by product, shows which items can go stickerless and which cannot. Our FBA inventory consulting service audits both.