# Amazon FBA labeling requirements supplier checklist: what your supplier must get right
When your goods go straight from a Chinese factory to an Amazon fulfillment center, nobody on your side touches the cartons. The supplier packs them, a forwarder moves them, and Amazon receives them. In that chain, labels decide everything. This Amazon FBA labeling requirements supplier guide exists because wrong or missing labels are one of the most common reasons first-time importers get hit with chargebacks on an otherwise fine order.
The rule is simple: the supplier applies the labels, but the importer owns the result. If a barcode is wrong, Amazon charges your seller account. So the labeling instructions need to reach the factory before production ends, in writing, with the label files attached. Below is how to do that without overcomplicating it.
Why the Amazon FBA labeling requirements supplier brief decides whether a shipment succeeds
Amazon's fulfillment centers check cartons at receiving. When the labels are right, boxes route to the right place and units enter inventory without anyone opening them. When labels are wrong or missing, Amazon charges per unit or per carton to fix or investigate. Those chargebacks turn a healthy margin into a thin one before you have sold a single unit.
Factories that have never done Amazon work tend to treat labels as an afterthought. They will stick a shipping mark on the outer carton and call it labeled. That is not enough for Amazon. The FBA system needs scannable unit barcodes, shipment-specific carton labels, and polybags with suffocation warnings where required. A supplier who learns about these needs after the goods are packed will improvise, and improvised labels are exactly what triggers fees.
The fix costs nothing: put the Amazon FBA labeling requirements supplier brief into your spec sheet as its own section, the same way you would list materials or dimensions. Suppliers who know you will verify labels at inspection take them seriously. Suppliers who hear about the labels at shipping time make mistakes.
FNSKU vs UPC: the one decision to hand your supplier in writing
Every sellable unit needs a scannable barcode. For most Amazon sellers that means FNSKU, not UPC.
FNSKU stands for Fulfillment Network Stock Keeping Unit. It is Amazon's identifier for your product inside your seller account. Two sellers with the same physical product each carry their own FNSKU. A UPC is the manufacturer barcode, which can be shared across sellers. When you create a shipment in Seller Central, Amazon tells you which one to apply.
That distinction matters less than what you do with it: send the supplier the exact barcode file, tell them where on the unit it goes, and get a photo of a scanned label before they label the whole batch. Many sellers choose FNSKU because it keeps their inventory identified to their account. Some use the manufacturer's UPC with commingled inventory instead. Either setup works as long as the supplier follows the instructions for that specific shipment.
Register barcodes through the legitimate channel. For retail products, GS1 is the recognized source of UPC numbers. FNSKU labels come from your Amazon seller account. What causes trouble is a supplier reusing an old barcode from a previous buyer's job, or slapping on a generic barcode bought somewhere. Fresh file per order, written confirmation of which file they used, and a scan test. That is the whole discipline.
Label placement is the other half. A label folded over a box edge, hidden under a shrink-wrap seam, or printed too small to scan is a failed label. Put a placement photo on the spec sheet, confirm it against your approved sample, and check it again at pre-shipment inspection. The PSI is your last look before the balance goes out.
Carton labels and pallet rules in this Amazon FBA labeling requirements supplier guide
Unit labels are half the job. Every carton in the shipment also needs a shipment label that Amazon generates when you create the shipment in Seller Central.
Generate the carton labels as soon as the shipment exists and send them to the supplier or forwarder with the unit labels, not as an afterthought. Cartons from different shipments that arrive mixed or unlabeled cannot be routed until someone identifies the contents, and that is where check-in delays start.
Pallets add a layer of their own. Some direct-to-FBA freight travels as loose cartons, some moves palletized, and the destination fulfillment center's stacking rules apply at receiving. Your forwarder usually handles the delivery appointment and knows what the destination expects. The supplier's part is packing cartons that stack cleanly and survive the trip. Overstuffed, bulging cartons change the declared dimensions and raise the chance of damage on the way.
Decide the carton spec early, confirm it with your forwarder, and write it into the purchase order. Size, label design, placement. When the supplier knows all three before production starts, the shipping side of the order runs the same way every time.
Polybags: the small detail that keeps triggering chargebacks
Polybags burn more small-item sellers than almost anything else in the Amazon FBA labeling requirements supplier process. The rules are plain: if the product ships in a polybag of a certain opening size, the bag needs a suffocation warning printed on it, and the bag has to be transparent enough for the barcode to scan through.
Suppliers buy generic polybags without warnings and pack the units anyway. The fix is cheap but it has to happen before production. Specify the warning in the packaging brief, confirm the wording and print size against Amazon's current packaging rules, and keep a sample bag with your approved reference set.
Then verify at inspection. Open a few finished units. Confirm the warning is legible, the barcode scans through the film, and the bag closes the way you specified. Finding unmarked bags at the factory leaves time to re-bag. Finding out on the water does not.
Writing the Amazon FBA labeling requirements supplier terms into the order
Verbal agreements do not survive a labeling dispute. A supplier who agreed to the labels in a WeChat call can still ship unlabeled stock and argue it was never part of the deal. Four pieces of paper prevent that.
The spec sheet comes first. Materials, dimensions, tolerances, colors, functions, packaging, labeling, QC criteria. It is the single source of truth, and labeling gets its own section: the FNSKU file, the carton label file, the polybag artwork, and photos showing where each label sits.
The purchase order comes second. Reference the spec sheet by name and state the Amazon FBA labeling requirements supplier terms explicitly. The proforma invoice already carries Incoterms, unit price, total value, weight, packed dimensions, HS code, payment terms, and lead time. Your PO binds those terms and adds the labeling instructions the PI usually skips.
The QC checklist comes third. Packaging and labeling sit on the inspection checklist next to spec compliance, visual checks, and barcodes. The inspector verifies unit labels, carton labels, polybag warnings, and label legibility against the approved sample. If labels are wrong at PSI, the supplier reworks before the goods ship, and the rework cost is theirs because the requirement was documented.
Payment terms come fourth. Many importers tie the balance to a passed inspection. When labeling is part of the inspection, the supplier knows the balance depends on getting the labels right.
The labeling mistakes suppliers keep making
Most failures come from a short list, and every item on it is preventable.
Wrong barcode on the unit. The supplier applies an old UPC from a previous batch or another buyer's leftover FNSKU. Prevention: fresh label file per order and written confirmation of which file they used.
Unit labels covered or unscannable. Labels tucked under shrink-wrap seams, folded over edges, or printed too small. Prevention: placement photo on the spec sheet and a scan test before mass labeling. The Amazon FBA labeling requirements supplier brief should name the exact barcode file, because a supplier who cannot point to the file they used has no way to prove they used the right one.
Missing carton labels. The units are labeled perfectly and the outer cartons carry nothing. Prevention: generate carton labels with the shipment and send them alongside the unit labels.
Unmarked polybags. Generic bags with no warning, or film too opaque to scan through. Prevention: bag spec in the packaging brief and a sealed reference sample.
Wrong quantities per carton. Contents that do not match the declared packing list cause check-in mismatches at receiving. Prevention: quantity check at PSI and a per-carton packing list the supplier fills in, verified by the inspector.
None of these are technical problems. They are communication problems, and they clear up when the Amazon FBA labeling requirements supplier brief arrives in writing early, with files attached and someone at the factory confirming receipt.
What to do when a shipment arrives mislabeled
Sometimes you only learn the labels were wrong after the goods reach Amazon. Start by documenting: photos of the labels, the packing list, and the spec sheet you sent. Then find where the chain broke.
If the PSI report shows correct labels and the labels changed afterward, the problem sits with whoever handled the goods after inspection, often the forwarder's consolidation warehouse. If the PSI never checked labels, that gap is the lesson. Update the Amazon FBA labeling requirements supplier checklist before the next order and confirm the inspector reads it, because a requirement the inspector does not know about will not be verified. A forwarder can sometimes relabel at a warehouse before the Amazon appointment, but it costs money and time, and not every problem is fixable that way.
Work the supplier side like any quality dispute: document everything, escalate in writing with deadlines, and use the inspection evidence. Solo importers usually absorb the loss, which is exactly why the paperwork matters before the order ships.
For repeat orders, build one habit: every reorder gets a fresh label file, a written confirmation of which file the supplier is using, and a label check in the pre-shipment inspection. Suppliers learn fast when the same check happens every single time.
Conclusion: the Amazon FBA labeling requirements supplier routine that prevents chargebacks
Treat labels as production instructions, not shipping paperwork. When the supplier receives the FNSKU file, the carton label design, the polybag artwork, and the placement photos with the order, and when the inspector verifies all of it before the balance is paid, labeling problems become rare. Get the Amazon FBA labeling requirements supplier terms into the spec sheet, the PO, and the QC checklist, and keep the same Amazon FBA labeling requirements supplier routine on every reorder. The goods leave China labeled, arrive at Amazon labeled, and check in without fees eating the margin.
FAQ: Amazon FBA labeling requirements supplier questions
Quick answers to the Amazon FBA labeling requirements supplier questions importers ask most.
### Who owns Amazon FBA labeling when the supplier ships direct?
You do. The supplier applies the labels, but Amazon charges the seller account when they are wrong. That is why the Amazon FBA labeling requirements supplier brief needs to be written into your spec sheet and purchase order rather than discussed verbally.
### Should the supplier use FNSKU or UPC on each unit?
Use whatever your Amazon shipment setup requires, and tell the supplier in writing with the file attached. Most sellers use FNSKU because it ties the inventory to their account. Confirm the current requirement in Seller Central when you create the shipment, since the correct barcode depends on that shipment's setup.
### Can my forwarder fix labels after the goods leave China?
Sometimes, at a warehouse before the Amazon appointment, for a fee. Not every problem is fixable that way. A supplier who labels correctly in the first place, verified at pre-shipment inspection, is the cheaper path.
### Do carton labels come from Amazon or from me?
They come from the shipment you create in Seller Central. Generate them, send them to your supplier or forwarder, and confirm they are on every carton before the goods ship.
### Why do polybags need suffocation warnings?
Amazon requires the warning on polybags of a certain size to protect consumers. Suppliers often use generic bags without it, which triggers chargebacks. Specify the warning in the packaging brief and verify it at inspection.
### How do I stop labeling mistakes on repeat orders?
Send a fresh label file with every order, get written confirmation of which file the supplier used, and keep the label check on the PSI checklist. Repeat the same verification every time and the supplier learns it is not optional.