Amazon's Manufacturer Barcode Crackdown: Why Resellers Must Use FNSKU Labels in 2026

By Bernardo Campelo, Forbes Business Council E-Commerce Leader, Amazon SPN Certified provider, Amazon SP-API authorized partner, and Founder of PrepVia.

If you sell on Amazon FBA without owning the brand, 2026 is the year the rules changed on you. Amazon has tightened its policy on manufacturer barcodes, the UPCs, EANs, JANs, and ISBNs printed on the product packaging by the original manufacturer, and the impact falls hardest on resellers, arbitrage sellers, and wholesalers who are not registered as brand owners.

Under the new enforcement, only sellers holding the Brand Representative role in Amazon Brand Registry can keep identifying units by the manufacturer barcode, and since March 31, 2026 those units are tracked to their own account through FBA virtual tracking, not pooled with anyone else's. Everyone else must apply an Amazon-issued FNSKU label on every single unit before it ships to a fulfillment center. No exceptions. No workarounds.

I run PrepVia, which is an Amazon SPN Certified prep center that applies up to 13,200 labels per hour for sellers of every size. I have watched this policy shift roll out across our client base, and the sellers who adapted first are the ones still shipping inventory on schedule. This guide explains exactly what changed, who it affects, and what to do about it.

What Is a Manufacturer Barcode on Amazon?

A manufacturer barcode is the standard product identifier printed on the retail packaging by the original brand or manufacturer. In the United States and Canada, this is almost always a UPC (Universal Product Code). In Europe and most other regions, it is an EAN (International Article Number, still abbreviated EAN). Books use an ISBN.

Historically, Amazon gave FBA sellers two options for identifying units inside fulfillment centers:

1. Stickerless, Commingled Inventory, also called the "stickerless" setting. Amazon scanned the manufacturer barcode already on the packaging. Your units were pooled with other sellers of the same UPC, and when a customer ordered, Amazon shipped from the nearest available unit regardless of who originally sent it.
2. FNSKU Labeling, Amazon generated a unique, seller-specific barcode called the FNSKU (Fulfillment Network Stock Keeping Unit). You printed and applied this label to every unit. Amazon tracked your units separately from other sellers.

Stickerless commingling saved resellers time and money because no labeling was required. Just ship the product in its original packaging and Amazon handled the rest. That option is gone: Amazon ended commingling for everyone on March 31, 2026, and brand representatives now keep the manufacturer barcode through FBA virtual tracking.

The Policy Change in 2026: What Actually Changed

Amazon ended commingling across the US store on March 31, 2026, and that is the date the rule became hard for non-brand-owners. Here is what changed in practical terms:

1. The manufacturer barcode is now gated by brand representation

There is no commingled program left to enroll in: since March 31, 2026 the manufacturer barcode is available only to brand representatives, and their units are tracked to their own account through FBA virtual tracking. Sellers who cannot prove they own the brand are no longer eligible, even if they successfully used stickerless in previous years.

2. Reseller stickerless inventory ended for new shipments

Since March 31, 2026, every reseller, including authorized resellers, has to use Amazon barcodes on every new shipment. Stickerless reseller inventory that was already stored in, or on its way to, a fulfillment center before that date needed no action and keeps selling under its original SKU. Any shipment created after March 31, 2026 has to carry Amazon barcodes.

3. Non-compliant shipments are being rejected

Amazon may refuse shipments that do not comply, and units that arrive without proper prep or labeling are not eligible for reimbursement if they are damaged or untraceable. Amazon stopped offering its paid FBA prep and item labeling service on January 1, 2026. What happens now is not a service: a reseller unit that arrives without an Amazon barcode is considered defective, Amazon applies a barcode sticker itself, and the defect is reported on your Inbound Performance Dashboard.

4. Enforcement is automated at the inbound level

Amazon's receiving systems now check barcode type against seller account status at intake. If a reseller tries to send stickerless units under a UPC they do not own, the mismatch is detected before the shipment even completes check-in.

FNSKU vs Manufacturer Barcode: The Real Difference

Understanding which barcode applies when is the foundation of staying compliant. Here is the distinction:

Some brand owners still apply FNSKU out of habit. Since the commingled pool ended on March 31, 2026, that habit buys no separation: units shipped on a brand representative's manufacturer barcode are already tracked to that brand's own account, and customers who buy from you only receive units from your inventory.

Why Amazon Made This Change

Amazon's own explanation, in its barcode choice and labeling FAQ, is short: most sellers now keep inventory close enough to customers that Amazon can deliver fast without commingling. Beyond that stated reason, the change also closes three problems sellers lived with:

Counterfeit and quality control

Commingled inventory was one way counterfeit complaints reached honest sellers. When a brand owner shipped genuine units under UPC 123456789012 and a bad actor shipped counterfeit units under the same UPC, pooled units could not always be told apart at fulfillment. When a customer complained, the legitimate brand owner took the reputation hit. Ending commingling removes that failure mode structurally.

Brand Registry alignment

Amazon has invested heavily in Brand Registry as the mechanism for authorizing brand control on the platform. Gating manufacturer barcode usage behind Brand Registry enrollment strengthens the program and makes it more valuable for enrolled brands.

Reducing rights complaints

Intellectual property complaints are a major source of account suspensions and support load. When every reseller carries a unique FNSKU, disputes about who shipped which unit become trivial to resolve. Amazon reduces arbitration cost.

Who Is Actually Impacted

Not every seller needs to change anything. Here is the breakdown:

Brand owners who qualify rarely gain anything by stickering anymore. Since commingling ended, the manufacturer barcode keeps their units in their own account, saves the labeling step, and, as Amazon itself points out, lets the same inventory serve Amazon, retail channels and other e-commerce platforms.

The Cost of FNSKU Labeling at Scale

If you are suddenly required to label every unit, the economic question is: what does this actually cost?

Self-labeling is possible but rarely efficient. A single worker manually printing and applying FNSKU labels handles roughly 200 to 400 units per hour. At a fully loaded labor cost of around $20 per hour including overhead, that is $0.05 to $0.10 per unit in labor alone, plus label stock, printer depreciation, and the opportunity cost of time you are not spending on product research or marketing.

Outsourced labeling through a prep center typically costs $0.05 to $0.25 per unit depending on volume, location, and included services. The math usually favors outsourcing once you are labeling more than about 500 units per week.

At PrepVia, our automated labeling line applies up to 13,200 labels per hour, roughly 33 to 66 times a manual station. Pricing for full FBA prep including FNSKU labeling is quoted per account on a free 15-minute call, and 0% sales tax applies on all prep services in Florida. See the full FBA labeling service breakdown.

Action Plan If You Are a Reseller

Action Plan If You Are a Brand Owner

How PrepVia Handles the Transition

At PrepVia we have already moved reseller accounts through this change. Our workflow looks like this:

1. Automated inbound check. When your inventory arrives, our WAZIN AI reads your shipment manifest and cross-references the UPC and FNSKU status against your Amazon account.
2. Automatic labeling at up to 13,200 labels per hour. Our automated labeling line applies FNSKU labels with 99.9% scan accuracy, covering standard, oversize, and multi-SKU shipments.
3. Quality control scan. Every labeled unit is verified against a second scanner to confirm the correct FNSKU was applied before boxing.
4. Shipment creation and dispatch. PrepVia creates the Amazon shipment through its own SP-API integration, and your units move to FBA within our 24 to 36 hour prep SLA.

Our FastLane 35H program guarantees 35 hours end to end, from check-in at PrepVia to Amazon FBA delivered status, or the prep is free.

Frequently Asked Questions

Is Amazon really banning manufacturer barcodes?

Amazon is not banning them outright. Manufacturer barcodes (UPC, EAN, ISBN) are still used and valid. What Amazon has changed is who is allowed to use them as the FBA identification method. Since March 31, 2026 commingling is over for everyone. Sellers with the Brand Representative role can still use the manufacturer barcode, with their units tracked to their own account through FBA virtual tracking. Everyone else must apply FNSKU labels.

What happens if I ship stickerless inventory without being the brand owner?

Amazon may refuse non-compliant shipments, and units received without proper prep or labeling are not eligible for reimbursement if they are damaged or untraceable. The paid prep and labeling service ended on January 1, 2026, so there is no labeling you can buy from Amazon. If a unit that needs an Amazon barcode arrives without one, Amazon marks it as defective, applies a sticker itself, and reports the defect on your Inbound Performance Dashboard. Repeated non-compliance can also lead to account warnings.

How do I switch a SKU from manufacturer barcode to FNSKU?

In Seller Central, go to Inventory, find the SKU, click Edit, and change the "Product identification method" from Manufacturer barcode to Amazon barcode (FNSKU). Amazon will generate an FNSKU that you must print and apply to every unit of that SKU before your next FBA shipment.

Can I still sell branded products I do not own on Amazon?

Yes. The policy change does not restrict what you can sell, only how you identify units going to FBA. You can continue selling branded products you do not own as long as you apply FNSKU labels on every unit and comply with Amazon's selling eligibility rules for the category.

What is the cheapest way to apply FNSKU labels at scale?

For volumes under 500 units per week, self-labeling works as long as the label meets Amazon's spec: 1 to 2 inches by 2 to 3 inches, black ink on non-reflective adhesive stock, printed at 300 DPI. For anything above that, a prep center almost always wins on total cost once you include labor, equipment, error rates, and your own time. Automated prep centers process over ten thousand units per hour with scan verification, which manual labor cannot match.

Does this affect international sellers on Amazon EU or UK?

Yes, the same policy direction applies across Amazon's global marketplaces. Brand owners using EAN or ISBN for stickerless fulfillment must be enrolled in Brand Registry for the relevant marketplace. Non-brand-owners selling in EU and UK must use Amazon-issued labels on every unit.

Does this affect Amazon Vendor Central?

Vendor Central operates on a different workflow where Amazon purchases inventory directly from the supplier. The barcode policy described here applies to Seller Central FBA, not Vendor Central. If you are a 1P vendor, your barcode handling is governed by your vendor agreement.

Final Take

This policy change is not a temporary enforcement push. It is a structural shift that aligns Amazon's inventory model with its long-term push toward brand-registered commerce. Resellers who adapt quickly, by updating SKUs, applying FNSKU labels on every unit, and outsourcing labeling at scale, will continue operating without disruption. Those who ignore the change will face rejected shipments, account warnings, and lost sales.

Manufacturer barcodes are not going away. They are just becoming a privilege of brand ownership instead of a shortcut for everyone. If you own your brand, this is a net positive. If you resell, the work of labeling every unit is now non-negotiable, and the cheapest way to do that at any serious volume is through an automated prep center.

If you need help moving to FNSKU-on-every-unit without slowing down your operation, schedule a 15-minute call with PrepVia. We have already processed this transition for resellers.