How to actually track your Amazon FBA inventory
Send a pallet into Fulfillment by Amazon and it does not simply appear on the buy box the next morning. It moves through a handful of stages inside Amazon’s warehouse network, and at any given moment your stock is sitting in one of them, not all available for sale at once.
Most sellers only notice this when something goes wrong, a listing goes out of stock while the inventory dashboard still shows units on hand, or a shipment vanishes for two weeks with no explanation. Knowing the stages your inventory actually moves through makes those situations far less mysterious, and far easier to catch early.
The six states your inventory can be in
Amazon’s Seller Central inventory dashboard sorts every unit you have sent into FBA into one of a few buckets, and only one of them is actually sellable. Available inventory is stock Amazon has received, checked in, and is showing to customers. Inbound is stock that is on its way to a fulfillment centre but has not been checked in yet, so it exists on paper but cannot be sold.
Reserved inventory covers stock that is temporarily off the market for a specific reason. That includes units already sold and waiting to ship, units in transit between fulfillment centres to spread stock across the network, and units sitting with a fulfillment centre while a quality check or count is finished. Unfulfillable inventory is stock that has been damaged, has expired, or has otherwise failed inspection, and Researching is the smaller, odder bucket for units that are misplaced or under investigation. Total is simply everything added together, and it is this number, not just Available, that counts against your storage limits.
Why the gap between total and available matters
A seller who only checks the top-line inventory number can be badly misled. You might be showing 500 units in your account, only to find most of them are reserved for FC transfers or stuck in processing, leaving barely enough Available stock to last the week. That is a stockout that looks, from a distance, like healthy inventory.
The reverse problem shows up too. Stock parked in Reserved or Inbound for longer than expected still counts toward your storage limits and cubic footage, so you can be paying for space and losing sales at the same time. The fix is not more inventory, it is checking the breakdown, not just the total, before deciding to reorder.
The tracking issues that catch sellers out
The most common complaint is a shipment that sits in Inbound far longer than the transit time it should take, usually because a fulfillment centre is backed up on receiving. Until it is checked in, none of it is sellable, no matter how full your warehouse dashboard looks.
The second is FC Processing delays, where units sit in a verification queue after arriving, quietly draining days off your in-stock window. The third is unfulfillable inventory that nobody investigates, sellers write off small amounts of damaged or expired stock as a cost of doing business, when a chunk of it is often eligible for reimbursement if you file a case. Left unmonitored, all three of these erode margin without ever showing up as an obvious problem.
Building a habit around your reports
Amazon gives you the raw material for this in Seller Central: the Manage FBA Inventory dashboard for a live status snapshot, the Inventory Age report for stock that has been sitting for a while, and the Restock Inventory report, which estimates when each SKU will run out based on recent sales velocity. None of these are exotic, they are simply not on by default in most sellers’ routine.
The sellers who avoid stockouts are the ones who check the breakdown weekly, not just the total, set a reorder point per SKU based on lead time from their supplier, and flag anything sitting in Reserved or Unfulfillable for more than a few days. It takes twenty minutes a week and it is the difference between planning your next shipment and reacting to an empty buy box.
Where a storefront fits into this
None of this inventory work is visible to a shopper, but it directly affects what they see. A listing that flips in and out of stock because of an Inbound delay looks unreliable, and Amazon’s own algorithm treats frequent stockouts as a signal to rank you lower. Solid inventory tracking is unglamorous, but it protects the storefront and listings you have already built.
If you're setting up or rebuilding a storefront, that's exactly the kind of build we do at ARTH.
Questions we hear a lot
Why does my inventory dashboard show more units than I can actually sell?
Because the total count includes Reserved, Inbound and Unfulfillable stock alongside Available stock. Only Available units are shown to customers, so always check the breakdown, not just the total, before deciding you're covered for the next few weeks.
How long should a shipment sit in Inbound status?
It varies by fulfillment centre and time of year, but if a shipment has taken noticeably longer than your usual transit time to move from Inbound to Available, it's worth opening a case with Seller Support rather than assuming it will resolve itself.
Can I get money back for inventory Amazon marks as unfulfillable?
Often, yes. If the damage happened at a fulfillment centre rather than in transit to Amazon, you can usually file for reimbursement. It's worth checking your Unfulfillable inventory report regularly instead of writing the loss off automatically.
What's the easiest way to avoid a stockout?
Set a reorder point for each SKU based on your supplier's lead time plus a buffer, and check Amazon's Restock Inventory report weekly rather than only when a listing goes out of stock.
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