Amazon Stopped Prepping Your Stock. Here's What That Actually Means

You send a pallet into Amazon the way you always have. Two weeks later you get an email: shipment rejected. Not delayed, not partially received. Rejected. The stock is coming back to you, at your cost, and there is a fee attached for the privilege.

Welcome to FBA after July 2026. If you have not looked closely at what changed, this is the piece worth ten minutes of your time — and you can apply all of it without ever speaking to a prep centre, ours included.

What actually changed

Two separate things, and people keep confusing them.

• 31 March 2026: every seller outside Brand Registry has to apply an FNSKU label to every single unit. No exceptions, no commingling your way out of it.
• 1 July 2026: Amazon stopped offering its own prep and label services across its European stores, the UK included. The US lost the same service on 1 January.

The second one is the killer. Amazon used to run a service where you sent in unprepped stock and paid a modest per-unit fee for them to sort it out. Label missing? They would stick one on. Needed a polybag? They had bags. That safety net is gone.

Note the distinction, because it trips people up constantly: Amazon's own prep service has closed. Independent prep centres are a completely different thing and are unaffected. One was Amazon doing the work inside a fulfilment centre. The other is a separate warehouse doing it before the stock ever gets there.

What Amazon now expects of every unit

Everything has to arrive ready to go straight onto a shelf. In practice that means:

• A scannable FNSKU label, applied over the manufacturer barcode so only one barcode is readable.
• Polybagging where required, with a suffocation warning in the correct size for the bag, properly positioned.
• Protective packaging on anything fragile — real cushioning, not optimism.
• Sets and multipacks assembled, sealed and labelled as a single sellable unit.
• Box content information declared, with correct box labels, weights and dimensions.

None of this is new as a requirement. What is new is that nobody will fix it for you.

What it costs when you get it wrong

This is the part worth internalising. A non-compliant shipment is not quietly corrected any more. Depending on the failure, Amazon will reject it, return it to you at your expense, or dispose of it — and apply a fee. If the units were not prepped correctly, you also lose the reimbursement safety net when something goes missing or gets damaged.

So the maths shifted. Prep used to be a cost you could defer. It is now a condition of your stock being sellable at all, and the downside of skipping it is not a fee — it is the entire consignment.

Your three options, honestly assessed

Option 1: do it yourself. Genuinely fine at low volume. A thermal label printer, a roll of polybags with pre-printed warnings, and a free evening will handle a few hundred units. The costs are a printer, your time, and the certainty that it stops being fine somewhere between five hundred and a thousand units a month. If you are shipping under about two hundred units a month, stop reading and go and buy a label printer.

Option 2: push it back to your supplier. Cheapest per unit if you can get it, because they are already handling the goods. Works well with private-label manufacturing where you control the spec. Works badly with wholesale and arbitrage, where the supplier has no interest in your FNSKUs. Ask, though — it costs nothing to ask, and a factory that already polybags for another client will often do yours for pennies.

Option 3: use a prep centre. Someone else's warehouse receives your stock, preps it and ships it in. You are buying time and compliance rather than storage. It makes sense when the evening labelling shift is costing you more in lost sourcing time than the per-unit fee, which happens earlier than most sellers expect.

What prep actually costs in the UK

Rates vary, but the market has settled into a fairly predictable band. FNSKU labelling typically runs somewhere between 35p and 60p a unit, polybagging between 20p and 40p, and outbound cartons between two and four pounds each. Most centres add a monthly account fee of roughly thirty to forty pounds, and most tier their pricing so the per-unit rate drops as your volume climbs.

Two things to check before you commit to anyone. First, model the total invoice rather than comparing headline per-unit rates — minimum charges can quietly dominate the bill on small batches. Second, find out who books the freight into Amazon. If the prep centre ships on your own Amazon Partnered Carrier account you keep your discounted inbound rates; if they ship on theirs, you are probably paying their margin on the postage as well as the prep.

The bit nobody mentions: Q4

Every prep centre in the country is busiest between October and December, because every seller is stuffing stock in before Christmas. That is precisely when turnaround times slip, and precisely when you can least afford it.

If you are planning a Q4 push, have the conversation in August, not November. Ask any prospective partner directly what happens to turnaround during peak and whether they cap intake. A straight answer tells you a great deal about how they run the place. A vague one tells you rather more.

So what should you do this week

• Audit one shipment. Take your last consignment and check it against Amazon's current prep requirements line by line. Most sellers find at least one thing they were relying on Amazon to catch.
• Work out your real cost per unit. Your hourly rate multiplied by the time it takes you, plus consumables. Compare that honestly to a prep quote before assuming DIY is cheaper.
• Ask your supplier. Free to ask, occasionally transformative.
• Sort it before September. Whatever you choose, having it in place before peak beats discovering the problem during it.

Amazon did not make prep harder. It made prep yours. The sellers who came out of July fine were the ones who had already stopped treating labelling as something that happened to their stock somewhere else.