It is an extra FBA charge for holding a large volume of inventory relative to how much you sell, measured by your inventory-to-sales ratio across your catalog. It targets overstock: accounts carrying far more cover than their sales justify for the space they occupy. Keeping inventory in line with sell-through avoids it.
How is the storage utilization surcharge calculated?
It is based on the ratio of your inventory volume to your sales volume, roughly the weeks of cover you hold across your catalog, rather than any single SKU. The further over a healthy ratio you sit, the more it can apply. Check Amazon's current policy for the exact metric and threshold, since Amazon sets and can adjust them.
Andrew Erickson is the founder of Inventory Hero. He has spent years working with Amazon FBA sellers on demand forecasting, restock planning, and the cash flow side of running a private-label brand. Inventory Hero exists because every spreadsheet-based inventory system he tried eventually broke — usually right before Q4.
Keep your overall inventory in line with your sell-through. Do not let total cover balloon far beyond what your sales support, which usually means forecasting and reordering per SKU rather than over-buying. It is the catalog-level version of the same right-sizing that keeps individual SKUs clear of aging surcharges.
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The FBA storage utilization surcharge is an extra charge for holding a high volume of inventory relative to your sales, measured by your inventory-to-sales ratio across the catalog. The short version: it targets overstock at the account level, the further your total cover sits above what your sales justify, the more it can apply, and you avoid it by keeping inventory in line with sell-through. Below is what triggers it and how to stay clear.
The surcharge is driven by your inventory-to-sales ratio, roughly how many weeks of cover you hold across your catalog relative to the volume you move.1 It is not about one slow SKU; it is about the overall pattern of carrying more inventory than your sales justify for the warehouse space it occupies. For a concrete picture: if your catalog sold 4,000 units over the recent sales window and you hold 24,000 units in FBA, your inventory-to-sales ratio is about 6 to 1, roughly six times the cover those sales support. The higher that multiple, the more exposed you are.
Amazon's goal is the same as with its other storage policies: keep its warehouse space productive. An account that fills space with inventory that turns slowly is, from Amazon's side, using space inefficiently, and the surcharge passes that back. See the days of supply concept for the per-SKU version of the same cover idea.
All three push the same direction: hold the right amount of inventory. Too much in aggregate triggers the utilization surcharge; individual units that sit too long trigger the aging surcharge; and at the opposite extreme, too little triggers the low-inventory-level fee. A chronically high utilization ratio also drags your IPI score, which can tighten your restock limits, so it is worth watching even before the surcharge applies.
The fix is the same right-sizing discipline that keeps you clear of the other storage charges, applied at the catalog level:
Match inventory to sell-through. Do not let total cover balloon far beyond what your sales support. Forecast and reorder per SKU rather than over-buying. See restock planning.
Clear the dead weight. Overstock and slow movers are what inflate your ratio. Promote, bundle, or remove them, the same actions that keep aging surcharges down. Model what the overstock costs in the storage fee calculator.
Watch the ratio, not just the SKUs. Because the surcharge is account-level, a catalog full of modestly-overstocked SKUs can trigger it even if no single one looks bad. Keep an eye on aggregate cover.
Use AWD as an overflow valve. Units held in Amazon Warehousing and Distribution do not count toward your FBA utilization ratio, so for a seasonal surge you can hold reserve in AWD and trickle it into FBA, keeping the FBA ratio in check while still having the stock close.
See where you stand. Your inventory dashboards in Seller Central, alongside the storage-fee reports, show your utilization and cover. The surcharge is assessed monthly with your storage fees, and Amazon sets and can adjust the exact ratio and threshold, so check Seller Central for the current figure and how close you are to it.
The FBA storage utilization surcharge is an account-level charge for holding too much inventory relative to your sales, based on your inventory-to-sales ratio. It is the aggregate version of the same message as the other storage fees: hold the right amount, not too much and not too little. Keep your catalog's cover in line with sell-through and it does not apply. For the full fee picture, see Amazon FBA fees 2026.