Storage Fees
Monthly per-cubic-foot fees Amazon charges for inventory in FBA, with surcharges in Q4 and on aged inventory.
FBA Storage Fees are the monthly per-cubic-foot fees Amazon charges for inventory stored in their fulfillment centers. Standard rates apply January through September; rates roughly triple in October-December (the "Q4 surcharge") to discourage sellers from over-stocking ahead of the holiday season. Long-term storage surcharges and aged inventory surcharges apply to inventory that's sat in FBA for too long.
The four storage fee components: (1) standard monthly fee per cubic foot, varying by storage class; (2) Q4 surcharge October-December; (3) Aged Inventory Surcharge for units stored 181+ days, escalating with age; (4) Long-Term Storage Fee for units stored 365+ days. For a SKU that sits idle for a year, storage cost can exceed the unit's gross profit — turning every "I'll sell it eventually" decision into a slow loss.
The defensive playbook: monitor IPI weekly, identify aged inventory monthly, take aggressive markdowns or removal orders on units approaching the 180-day window, and use AWD for any inventory that doesn't need to be in FBA right now. SellerVault surfaces aged inventory and projected storage cost on the inventory dashboard.