Zero available, hundreds reserved: how to tell a transfer from lost FBA stock
Available says zero but units show as reserved. What each reserved state means, how long it lasts, and the counting traps that hide real stockouts.
You open your inventory in Seller Central. A product that should have weeks of stock shows 0 available. Ads are still spending and Black Friday is close. The first instinct is to assume the stock is lost, place an emergency order, or pause every campaign. Before you do any of that, look at the reserved number. Very often the units are still inside Amazon's network. They just can't be counted as sellable right now.
In our experience, the weeks between Prime Big Deal Days and Black Friday bring a lot of this. Here is what reserved means, how long each kind usually lasts, and the counting mistakes that make stock look healthier or worse than it is.
What "reserved" means on FBA
With FBA (Fulfillment by Amazon), your units sit in Amazon's fulfillment centres, the warehouses that pick and ship orders. Amazon splits your stock into buckets. Available is what can ship to a new customer now. Inbound is on its way to Amazon. Unfulfillable is damaged or otherwise unsellable. Reserved is stock Amazon holds but has set aside for one of three reasons:
- Customer orders. The units are tied to orders already placed. They leave this status when they ship.
- FC transfers. The units are moving from one fulfillment centre (FC) to another so stock is spread across the network. You will also see this called transshipment.
- FC processing. The warehouse has pulled the units aside for extra work, such as checking dimensions and weight, an investigation, or a pending removal order.
The Reserved Inventory report breaks your reserved units down by reason. The Restock Inventory report also shows FC transfer, FC processing and customer order as separate columns. Run one of them before you decide anything.
How long each state lasts, and when to worry
Customer orders clear on their own as orders ship. A small number here is normal. That stock is already sold.
FC transfers are the big one. Amazon says units in transfer can still be sold, but they can't get Prime delivery until they reach the destination warehouse, and shoppers may see a later ship date if no other units are on hand. Amazon has said a transfer can take 22 to 25 days, and longer when weather or similar events get in the way. In our experience many land sooner, and no screen gives you an arrival date for a given transfer. Treat it as a stockout window. It is real and it is temporary, and it says nothing bad about your supply.
FC processing depends on the reason. Dimension checks tend to clear quickly. Units held for an investigation can sit longer. If processing units don't move for a couple of weeks, check the product for a listing restriction or a missing compliance document, then open a case.
So when is it a real problem? When available plus reserved plus inbound is lower than what you expect to sell before your next shipment lands. That is a supply problem, and a reorder is the right call. When available is zero and reserved is large, it is usually a timing problem. A panic reorder then can leave you with too much stock in January.
The counting traps that fool owners
On the accounts we run, the costly mistakes come less from Amazon losing units and more from adding numbers up wrong. Four to watch.
Several SKUs on one ASIN. The ASIN is Amazon's product ID. The SKU is your own code for an offer. Older accounts often have two or three SKUs on the same ASIN. In our experience, when those SKUs draw from one shared pool, each one reports the whole pool. Illustrative example: three SKUs each show 500 available. You have 500 units, and a spreadsheet that sums the rows says 1,500. The tell is identical numbers on every row. If the numbers differ, the stock is usually separate and adding is correct.
The reverse case. A reorder list built one row per SKU will flag an old SKU sitting at zero, while its sibling on the same ASIN is fully stocked. The fix for both: group by ASIN first, then look at the SKUs.
Canadian reports with US rows. The Inventory Ledger report is Amazon's running statement of every unit received, shipped, moved, lost or found. It has a location column that says which country each row belongs to. In our experience, a ledger pulled for Amazon.ca can still include US warehouse rows. Unfiltered, a Canadian stockout looks like healthy stock, and a US receipt looks like a Canadian one. Filter to Canada before you total anything.
Reserved counted twice, or not at all. Amazon notes that units being prepared for a transfer can show under both FC transfer and FC processing for a short time. Different screens and reports can also disagree on the reserved figure. In our experience, the total quantity Amazon reports is steadier than adding available, reserved and inbound yourself.
One more: the product page can keep showing your offer as in stock for hours after available hits zero. Don't use the Buy Box as proof that you have stock.
What to check before you act
A zero in available is a question. Answer it with the reserved breakdown and a clean count by ASIN and by country, then decide. Most of the time the right move is to wait out the transfer, ease off ad spend on that one product, and keep your reorder on its normal schedule. Save the emergency order for when the totals, counted correctly, say you are short.
