Amazon Inventory Alerts: Never Get Surprised Again | Inventory Hero
·5 min readInventory Planning
Amazon Inventory Alerts: Never Get Surprised Again
Amazon inventory alerts warn you before you stock out, age into fees, or strand stock. What to alert on, how to set them up, and how to set thresholds.
You have three routes. Amazon's own tools surface some signals, like restock recommendations and stranded-inventory notices in Seller Central. A spreadsheet can flag low stock with a reorder formula that turns on when days of supply drops below your threshold. Or inventory software can watch your live data and alert you continuously. The key is that the alert fires early enough to act, not once you have already run out.
What inventory alerts should an Amazon seller have?
The most important are a low-stock or reorder-point alert (so you reorder before running out), an aging-inventory alert (so you clear stock before the aged inventory surcharge hits), and a stranded-inventory alert (so unsellable stock gets fixed fast). Useful additions are alerts for inbound-shipment discrepancies and unusual sales spikes or drops that change your reorder timing.
T. Brian Jones is co-founder and CTO of Inventory Hero. He leads the engineering behind its Amazon data pipeline, demand forecasting, and the AI platform that lets sellers talk to their live inventory, sales, and supplier data in plain language.
At your reorder point, not at zero. A useful low-stock alert accounts for your full lead time plus a safety buffer, so it fires while there is still time to place an order and receive it before you stock out. An alert that fires when you are nearly empty is too late to help, since a new order cannot arrive in time. Set the threshold to lead time plus buffer, per SKU.
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Amazon inventory alerts warn you about a problem while you can still fix it, instead of discovering it after it has cost you a stockout or a storage surcharge. The short version: the alerts that matter are low-stock or reorder-point, aging, and stranded-inventory warnings, a good alert fires with enough lead time to act, and you can build them in a spreadsheet, use Amazon's signals, or let software watch continuously. Below is what to alert on, how, and how to set thresholds.
Not every notification is worth having; a few catch the problems that actually cost money:
Low-stock / reorder-point alert. The most important one: it tells you to reorder before you run out, protecting sales and ranking. It should fire at your reorder point, not at zero.
Aging-inventory alert. Warns you when stock is approaching the aged inventory surcharge threshold, so you can clear it before the surcharge hits.
Stranded-inventory alert. Flags units with no active listing, sitting unsellable, so you fix the listing fast rather than paying to store dead stock. See stranded inventory.
Get these three and you have covered the expensive surprises. Everything else is a refinement.
There are three practical ways to run inventory alerts, in rough order of effort and reliability:
Amazon's own signals. Seller Central surfaces restock recommendations, stranded-inventory notices, and some aging warnings. They are a starting point but not a complete or perfectly-timed system.
A spreadsheet. A reorder-flag formula turns on when days of supply drops below your threshold, giving you a manual alert every time you refresh the sheet. It works but is only as current as your last update.
Inventory software. A tool watching your live data can alert continuously and automatically, which removes the "only as fresh as your last refresh" problem the other two have.
The right choice depends on your scale: a small catalog can run on Amazon's signals plus a spreadsheet; a larger one benefits from continuous, automated alerts.
An alert is only as useful as its threshold, and the common mistake is setting them too late:
Reorder alert: lead time plus buffer. Set the low-stock threshold to your full lead time (production, freight, and Amazon receiving) plus a safety buffer, in days of supply, so it fires with time to act, in days of supply. A 60-day lead time means the alert should fire at roughly 60 days of supply plus your buffer, not at 10.
Aging alert: before the surcharge, not at it. Set it a month or two ahead of the aged-inventory surcharge date (which begins at 181 days), so you have time to mark down or remove.
Per SKU, not one size. Your fast movers and long-lead items need different thresholds; a single blanket rule will fire too early on some and too late on others.
Thresholds set to your real lead times are what turn alerts from noise into a system that actually prevents problems.
The failure mode of alerts is not too few; it is too many. When everything is an alert, nothing is, and you learn to ignore the notifications, including the one that mattered. Keep them useful:
Alert only on the actionable. If an alert does not have a clear action attached (reorder, mark down, fix a listing), it is noise. Cut it.
Tune the thresholds so an alert does not fire constantly on a SKU that hovers near its trigger; only re-alert after a real change, not on every tiny wobble.
Prioritize by impact. A stockout warning on your top seller is not the same as one on a slow C-item; where you can, make the important ones louder and the minor ones quieter.
Review and prune. If you routinely ignore a particular alert, either fix its threshold or turn it off, because an alert you ignore trains you to ignore the whole category.
The goal is a short list of alerts you always act on, not a long list you have learned to dismiss.
Amazon inventory alerts exist to warn you early enough to act: low-stock or reorder-point alerts protect sales, aging alerts prevent storage surcharges, and stranded alerts recover dead stock. Set thresholds to your real lead time plus a buffer so they fire with time to respond, run them through Amazon's signals, a spreadsheet, or software depending on your scale, and add secondary alerts once the core three are smooth. For the reorder math behind the threshold, see reorder points; for the wider system, restock planning.