Amazon’s long-term storage fee — officially renamed the Aged Inventory Surcharge — is a monthly penalty applied to FBA units that have been sitting in a fulfillment center for more than 181 days. It stacks on top of the standard monthly storage fee and escalates with age.

How the Aged Inventory Surcharge Works

  1. Amazon runs an inventory-age assessment on the 15th of every month.
  2. Any unit stored for 181 or more days is charged the surcharge in addition to the base monthly storage fee.
  3. The surcharge rate escalates: 181-210 days is the lowest tier, 271-365 days is higher, and 365+ days is the highest.
  4. Fees are debited from the next disbursement and appear on the Storage Fees report.
  5. Units removed, disposed of, or sold before the 15th assessment date avoid that month’s charge.

Aged Inventory Surcharge Rate Structure

Storage Age Approximate Rate (per cubic foot)
181-210 days $0.50
211-240 days $0.60
241-270 days $0.85
271-300 days $1.40
301-330 days $1.90
331-365 days $2.40
365+ days $6.90

Rates change with Amazon’s periodic fee updates — confirm current amounts in Seller Central’s FBA inventory storage fees help page.

Why It Matters for Sellers

The Aged Inventory Surcharge can turn a slow-moving SKU from breakeven into a loss overnight — especially at the 365+ tier where fees exceed most product wholesale costs. Sellers who monitor sell-through rates and act on aging inventory (price promotions, Outlet listings, or removal orders) before day 181 avoid the surcharge entirely.

How SellerSonar Helps

  • Retail Issues Alerts surface stranded and slow-moving units before they cross the 181-day line.
  • The FBA Calculator models the true landed cost of a SKU including storage assumptions.

Start your free SellerSonar trial today.

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