Amazon account operations
Amazon inventory monitoring
Stock on Amazon behaves differently from stock in your own warehouse. Units sent to Fulfilment by Amazon take time to arrive and become available, storage is charged on what sits there, slow stock can attract further charges, and stock can become unsellable if its listing has a problem. Inventory monitoring for Amazon tracks stock in both places, plans inbound shipments so best sellers do not run out, spots slow stock before it becomes expensive and catches stock that cannot sell.
This page covers Amazon-specific stock monitoring. Low stock alerts for your own online store are covered on the ecommerce automation pages.
Illustrative diagram
- Your warehouse
- Shipment prepared
- In transit
- Received
- Available
- Monitored
What to monitor
| Measure | Why it matters |
|---|---|
| Available units at fulfilment centres | What can sell today |
| Days of cover at current sales | When to send more |
| Inbound shipments and their status | What is on the way and when |
| Units that cannot sell | Storage paid with no sales |
| Slow-moving units | Risk of further storage charges |
| Stock in your own warehouse | What can be sent next |
Plan for inbound time
Sending stock to a fulfilment centre takes time: preparing and labelling, transport and receiving before units become available. Record how long your shipments actually take from dispatch to availability, and add it to supplier lead time when deciding when to send more. If a best seller has fewer days of cover than your inbound time, it will run out before new stock is available. Amazon says FBA sellers are provided with reporting tools and dashboards to help forecast FBA inventory; use them alongside your own sales history.
Keep a buffer in your own warehouse for fast sellers where possible.
Slow stock and storage charges
Amazon charges monthly for inventory held at its fulfilment centres, and its UK pricing page notes that some sellers may incur additional fees such as long-term storage fees. Slow stock therefore costs more the longer it sits. Review slow lines monthly: reduce what you send, run a promotion, move stock back to your own warehouse or consider other options Amazon offers, after checking any charges involved. Avoid sending more than a few months' cover of a slow line.
A weekly stock routine
Availability
- Best sellers' days of cover
- Units that cannot sell and why
- Listings with stock but no sales
Inbound
- Shipments in transit and receiving
- Discrepancies between sent and received
- Next shipment plan
Slow stock
- Lines with long cover
- Action agreed for each
Checking what arrived
Compare units sent in each shipment with units received. Differences may be counting errors, damage or labelling problems; investigate promptly, keep shipment documents and open a case with Amazon where units appear to be missing. Delays in checking make discrepancies harder to resolve.
Example: best sellers running out
Illustrative example — not a client case study
Situation: A seller keeps running out of two best sellers on Amazon even though stock sits in its own warehouse.
- Actual inbound time is measured from past shipments and added to the reorder calculation.
- A weekly report flags any best seller with fewer days of cover than inbound time plus a margin.
- Slow lines are reviewed monthly, and smaller, more frequent shipments replace large ones.
What this shows: Stock-outs on the best sellers became rare, and storage on slow lines fell. This example is illustrative.
How much to keep at Amazon
More stock at fulfilment centres
Suits you when
- Fast, steady sellers
- Inbound time is long
- Stock-outs are costly
Watch out for
- Storage charges
- Cash tied up away from other channels
More stock in your own warehouse
Suits you when
- Slow or seasonal lines
- Stock shared with other channels
- Uncertain demand
Watch out for
- Send shipments in good time
- Risk of running out on Amazon
Seller-fulfilled stock
If you ship some Amazon orders yourself, the stock figure on Amazon must stay in step with what is on your shelves, especially when the same stock sells on other channels. The inventory integration pages cover keeping one stock figure across channels; for Amazon monitoring, check weekly that quantities shown match what you can actually dispatch.
Before peak seasons
Check Amazon's current guidance on inbound shipments before busy periods, if any applies, and send stock for best sellers early, allowing for possible delays.
Who decides
Monitoring should inform a buyer or owner who decides what to send and when; agree that person and a weekly time for the decision.
Questions about Amazon inventory monitoring
What should be monitored on Amazon?
Available units, days of cover, inbound shipments, stock that cannot sell and slow lines.
Why measure inbound time?
Stock takes time to become available after you send it, so reorders must allow for it.
Does slow stock cost more?
Amazon charges for storage, and notes some sellers may incur long-term storage fees.
What if units go missing in a shipment?
Compare sent and received promptly and open a case with evidence.
Does Amazon provide stock reports?
Amazon says FBA sellers get reporting tools and dashboards to help forecast inventory.
Where are store stock alerts covered?
On the low stock alert automation pages.
Sources referenced
Platform features, guidance and rules change. We check the current versions before committing to an approach. This page is general information, not legal advice.
- Amazon: Fulfilment by Amazon (opens in a new tab) — reviewed 2026-10-28
- Amazon: Selling on Amazon: pricing (opens in a new tab) — reviewed 2026-10-28
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