Amazon FBA
Do I need FNSKU labels after Amazon ended commingling?
A set needs its own FNSKU. A brand owner with a UPC, EAN, or ISBN may keep the manufacturer barcode.
After Amazon ended commingling, the label on each unit depends on two things: whether you own the brand, and whether the product has its own retail barcode. Since 31 March 2026, a reseller who is not the brand owner needs an FNSKU on every unit. A brand owner in Brand Registry whose product has its own UPC, EAN, or ISBN may still use that manufacturer barcode, if Seller Central allows it for the listing. A set always needs its own FNSKU.
The checker on the label page asks the same three questions and needs no account.
Who needs an FNSKU after commingling ended?
| Who is selling | Barcode on the product | What to print |
|---|---|---|
| Any seller | Sold as a set of several items | The set's own FNSKU. Tick Sold as set. |
| Brand owner in Brand Registry | Its own UPC, EAN, or ISBN | The manufacturer barcode can be enough. Check Seller Central first. |
| Brand owner in Brand Registry | No retail barcode of its own | An FNSKU. |
| Reseller, not the brand owner | Any barcode, or none | An FNSKU on every unit, covering the manufacturer barcode. |
The checker follows this order: a set always needs an FNSKU; otherwise a brand owner with their own UPC, EAN, or ISBN may use it; everyone else needs an FNSKU, and the page scrolls to the label form.
When is the manufacturer barcode enough?
Only when both are true: you are the brand owner in Brand Registry for this product, and the product has its own UPC, EAN, or ISBN.
- Confirm you are the brand owner in Brand Registry for this exact product.
- Confirm the pack has its own UPC, EAN, or ISBN, and that its check digit is valid. The barcode form tells you.
- Open the barcode setting for the listing in Seller Central. If it still asks for an FNSKU, print an FNSKU.
- If the manufacturer barcode is accepted, print it as an EAN-13 or a UPC-A.
- Scan the printed barcode and compare the digits with the listing.
A reseller who finds a UPC already printed on a wholesale unit still covers it and applies their own FNSKU. Sharing one manufacturer barcode across sellers is exactly what the change ended.
What if the product is sold as a set?
A set is a different offer from the pieces inside it, so it needs its own FNSKU, copied from the set's row in Seller Central. On the label generator, tick Sold as set. The label then prints Sold as set – do not separate, so the warehouse keeps the pieces together. The checker ticks the box for you when you answer yes to the set question.
The pieces inside may keep their own UPCs if the packaging needs them, but the outside of the set carries the set's FNSKU. Cover any barcode a scanner could read by mistake, and make sure the label scans without opening a poly bag.
What should I check in Seller Central?
- The barcode setting of each listing: manufacturer barcode or Amazon barcode.
- Whether the listing is a set, and its own FNSKU if it is.
- The FNSKU field itself. Copy it from there, not from the ASIN.
Seller Central is the authority for your account. If it shows a different instruction from this page, follow Seller Central. When you know what to print, continue on the label generator or the EAN-13 guide.
Frequently asked questions
Did commingling end for every seller?
A reseller who is not the brand owner needs an FNSKU on every unit sent to Amazon since 31 March 2026. A brand owner whose product has its own UPC, EAN, or ISBN may still be allowed to use that barcode. Seller Central shows the setting for each listing.
Does a UPC on the pack replace the FNSKU?
Only for the brand owner in Brand Registry, when Seller Central accepts the manufacturer barcode for that listing. A reseller covers the UPC and applies their own FNSKU.
What if I sell a set?
The set needs its own FNSKU, even when each piece has a retail barcode. Tick Sold as set so the label says the pieces stay together.
Where is the checker?
On the label page, under Do I need FNSKU labels. It asks three questions and needs no account.
What if Seller Central says something different?
Follow Seller Central. It is the authority for the barcode setting of each listing; the checker is a quick guide.
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