Seller Central has no chargebacks and no Co-Op — those are Vendor Central mechanics. The same 2–5% still disappears, through four channels: inventory Amazon loses or damages, refunds where the customer never sends the item back, wrong measurements inflating every FBA fee, and refund administration fees. All four are claimable.
Chargebacks and Co-Op are Vendor Central problems
If you sell on Seller Central, half the vocabulary in the average “hidden Amazon fees” article does not apply to you. Chargebacks, Co-Op accruals, shortage claims, price protection — those are Vendor Central mechanics. They exist because 1P is a wholesale relationship built on purchase orders, and Amazon deducts against those orders.
You have no purchase orders. Nobody sends you a Co-Op invoice. And yet the same 2–5% of profit goes missing, because on 3P the leak has different plumbing. It comes from the automated parts of Amazon — FBA receiving, transfers between fulfilment centres, the cubiscan, the returns pipeline — and from customers who work the returns policy.
There is one structural difference worth holding on to. A 1P deduction arrives as a line on a remittance you can point at and dispute. A 3P deduction mostly arrives as an absence: money that should have come back to you and quietly didn’t. Nothing turns red. Nobody emails you. You have to go looking, and the looking has a deadline.
The four deductions that drain a Seller Central account
Lost and damaged inventory
The largest single line, and the least visible. Amazon loses cartons and individual units at inbound receiving, and damages them during transfers between fulfilment centres.
The system is supposed to reimburse automatically, and often it does. On the accounts we inherit it still misses roughly 15–30% of these units. Those cases do not fail loudly — they simply never appear, and the claim window closes on them while the seller assumes the automation handled it.
Refunds where the item never comes back
When a customer requests a return, Amazon refunds them immediately, out of your balance. The customer then has 45 days to actually ship the item to a fulfilment centre.
If they never do, Amazon owes you that money back. A large share of these transactions stall in the system and settle only when someone opens a case. This is the most mechanical category on the list — it is a date comparison between two reports, and it is the one most sellers have never run.
Wrong dimensions and weight
Fulfilment centres measure products with automated scanners. A few millimetres or a few grams of error can push an ASIN into the next size tier — Large Standard becomes Bulky, and every unit from that moment carries a higher fulfilment fee and a higher storage fee.
This one compounds differently from the others. Lost inventory is a fixed loss you either claim or don’t. A wrong measurement is a rate applied to every future sale, so on a fast-moving SKU it outgrows all three other categories inside a quarter.
Refund administration fees and switcheroos
Two separate things that both surface on returns.
On a refund, Amazon returns the referral fee to you but retains a share of it — 20%, capped at $5 per unit — as a refund administration fee. That one is contractual, not an error; it belongs in your returns provision rather than in a claim.
The switcheroo is the opposite. The customer returns a counterfeit, their own worn-out unit, or an empty box, and a fulfilment centre associate grades it as Sellable or Customer Damaged. You get the refund charged, the return marked closed, and no usable inventory back. This one is a claim, and it needs evidence.
Find the money in your own reports
Everything above is visible in reports you already have. Three reconciliations cover most of it.
| What you are looking for | Reports to compare | The signal |
|---|---|---|
| Units lost at inbound | Shipping queue vs Inbound performance | Shipped quantity higher than received quantity |
| Refunds never returned | FBA customer returns vs Reimbursements | Refund older than 45 days with no matching return |
| Fee inflated by measurement | Fee preview vs your own measurements | Fee per unit rising with no price or tier change |
Run them on a fixed cadence rather than when something feels wrong. Quarterly is the minimum that keeps you inside the claim window; monthly is what we run on accounts above a few thousand units.
File the claim so it actually pays
A case that pays and a case that gets closed as “no action required” usually differ by attachments, not by argument.
- Open it in the right place. Inventory cases belong under Help → Inventory lost or damaged, not in a general contact form. The routing decides who reads it.
- Attach proof of delivery. For a disputed inbound shipment, the carrier’s signed POD is what turns “we never received it” into a reconcilable event.
- Attach a commercial invoice. Reimbursement is paid against demonstrated cost. Without an invoice the value is Amazon’s estimate, which is rarely your number.
- One shipment or one order per case. Bundled cases get closed as a batch when any single item in them is refused.
- Log every case ID. Reopening a closed case with its history is a different conversation from filing a fresh one after the window has moved.
If you sell from your own warehouse, the same fraud has a different door: SAFE-T claims cover Seller-Fulfilled orders where the customer returned something other than what they bought. Photograph the returned item, record serial numbers, keep the carrier label.
The check worth running this week
Of everything here, remeasurement has the best effort-to-return ratio. It is free, Amazon rescans on its own equipment, and if the original measurement was wrong the fee corrects going forward and the overcharge for the previous 90 days comes back.
There is a monthly cap on requests, so it is not a bulk operation. Sort by units shipped, take the ASINs at the top, and check the ones where the fee per unit moved without a price change or a packaging change. On a SKU selling a thousand units a month, a single tier correction is usually worth more than every lost-inventory claim you will file that quarter.
Do it yourself, or buy the software
The honest threshold is volume. Below roughly 500 units a month, a disciplined quarterly audit recovers most of what is recoverable, and the reports are small enough to reconcile by hand.
Above that, the reconciliation stops being a task and becomes a job — hundreds of report lines, every one of them time-limited. That is where the recovery tools earn their keep: Helium 10’s Refund Genie, SellerLocker, Carbon6 / SellerInvest, Gorilla ROI. Most price as a share of what they actually recover, which keeps the incentive pointed the right way.
What none of them do is prevent the leak. They find money that has already gone missing. The measurement audit, the packaging that survives a transfer, the returns provision that reflects the real refund administration fee — those stay your job either way.
One caveat on all of it: Amazon changes claim windows, fee tiers and reimbursement policy regularly, and has shortened several of these windows in recent years. Confirm the current numbers on the policy page before you build a process around them.
Frequent questions
What counts as a hidden Amazon fee for a 3P seller?
Anything that reduces your payout without appearing as a line item you agreed to. On Seller Central that is mostly inventory Amazon lost or damaged and never reimbursed, refunds issued to customers who never returned the goods, FBA fees calculated from wrong dimensions, and the refund administration fee retained on every return.
How long do I have to file an FBA reimbursement claim?
It depends on the case type, and the windows have been shortened more than once — plan on roughly 9 to 18 months from the event, and treat anything older than that as lost. Because the clock runs from the event and not from the day you notice, an account audited once a year will always be writing off its oldest claims.
Does Amazon reimburse lost inventory automatically?
Partly. There is an automatic engine and it does catch a large share of cases. In our experience it still misses somewhere between 15% and 30% of lost or damaged units, and those never surface unless somebody reconciles the inventory ledger against the reimbursement report.
How do I fix an FBA size tier that looks wrong?
Request a remeasurement from Seller Central under Help, and Amazon rescans the unit on its own equipment at no cost. If the original measurement was wrong, the fee changes going forward and Amazon refunds the overcharge for the previous 90 days. There is a monthly cap on requests, so start with the ASINs carrying the most units.
Is reimbursement software worth paying for?
Above roughly 500 units a month, yes — the manual reconciliation stops being a task and becomes a job. Most tools charge a share of what they recover, so the cost tracks the result. Below that volume a quarterly manual audit usually recovers most of the same money.