Amazon FBA Aged Inventory Surcharge Calculator

What is the Amazon FBA aged inventory surcharge? The aged inventory surcharge (formerly the long-term storage fee) is an additional monthly fee Amazon charges on FBA inventory stored for more than 271 days. It is charged on top of the regular monthly storage fee. The surcharge is assessed on the 15th of each month for all units that have been in an Amazon fulfillment center for 271 days or more as of that date.

Enter your product dimensions and the number of units in each age bucket to see your exact monthly aged inventory surcharge — before it quietly eats through your margin.

Product
Size tier affects the base monthly storage fee; the aged surcharge rate is the same for both tiers.
Aged Inventory Units
Surcharge: $1.50/ft³/month
Surcharge: higher of $6.90/ft³ or $0.15/unit per month
Include Monthly Storage Fee (optional)
Enter your total FBA unit count to add the base monthly storage fee to the total. Leave blank to see surcharges only.
Total Monthly Aged Surcharge
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surcharge on aged units
Total Aged Units
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Avg Surcharge/Unit
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Rates based on Amazon's 2025 FBA fee schedule. Always verify current rates in Seller Central.

See your base monthly storage fee:  FBA Storage Fee Calculator →

See exactly which SKUs are approaching the 271-day threshold — automatically

SellerGuards tracks inventory age per ASIN and alerts you before aged surcharges kick in, so you can act — not react. No spreadsheets. Connected once via Amazon SP-API.

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Frequently Asked Questions

What is the Amazon FBA aged inventory surcharge?

The aged inventory surcharge (formerly the long-term storage fee) is an additional monthly fee Amazon charges on FBA inventory stored for more than 271 days. It is charged on top of the regular monthly storage fee. The surcharge is assessed on the 15th of each month for all units that have been in an Amazon fulfillment center for 271 days or more as of that date.

How much is the aged inventory surcharge?

There are two tiers: (1) Inventory aged 271–365 days: $1.50 per cubic foot per month. (2) Inventory aged over 365 days: the higher of $6.90 per cubic foot or $0.15 per unit, per month. These surcharges apply in addition to regular monthly storage fees.

How is the 365+ day surcharge calculated?

For each unit aged over 365 days, Amazon charges the higher of: $6.90 × (cubic feet per unit) or $0.15 per unit. For small products under roughly 0.022 cubic feet, the $0.15/unit floor kicks in. For most standard products, the $6.90/cubic foot rate will exceed the minimum. This calculator shows which rate applies to your specific product size.

When is the aged inventory surcharge assessed?

The surcharge is assessed on the 15th of each month for all units that have been in Amazon's fulfillment network for 271 days or more as of that date. It is charged separately from (and in addition to) the regular monthly storage fee. You can review your Inventory Age report in Seller Central to see which units are approaching the threshold.

How can I avoid the aged inventory surcharge?

The most common approaches: (1) create removal orders to pull inventory before it hits the 271-day threshold; (2) use Amazon Outlet or Liquidations to sell units at a discount; (3) lower your price to accelerate sell-through; (4) run targeted PPC on slow-moving ASINs; (5) right-size your replenishment so you’re not over-sending in the first place. Monitor your Inventory Age report in Seller Central regularly — SellerGuards can automate this visibility for you.