Executive takeaways
- Standard-size monthly storage jumps from $0.78/cu ft (Jan–Sep) to $2.40/cu ft in Q4 (Oct–Dec).
- Aged inventory surcharges begin at day 181 and escalate up to $6.90/cu ft at 365+ days.
- Calculate your cubic volume per unit to forecast exact holiday warehousing expenses.
- Liquidate or discount slow-moving inventory before October 1st to avoid peak storage penalties.
The Q4 Storage Fee Multiplication Effect
Between October 1 and December 31, Amazon increases monthly storage rates dramatically to discourage sellers from using fulfillment centers as long-term storage facilities:
- Standard-Size Storage: Increases from $0.78/cu ft to $2.40/cu ft (+207% increase).
- Bulky / Oversize Storage: Increases from $0.56/cu ft to $1.40/cu ft (+150% increase).
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2026–2027 Aged Inventory Surcharges (Year-Round)
If inventory remains unsold beyond 180 days, Amazon stacks additional aged inventory fees on top of standard monthly storage:
| Storage Duration | Monthly Surcharge Rate (Per Cubic Foot) |
|---|---|
| 0 to 180 Days | $0.00 |
| 181 to 210 Days | $0.50 |
| 211 to 240 Days | $1.00 |
| 241 to 270 Days | $1.50 |
| 271 to 300 Days | $3.80 |
| 301 to 330 Days | $4.00 |
| 331 to 365 Days | $4.20 |
| 365+ Days | $6.90 or $0.15/unit (whichever is greater) |
Interactive calculation tool
Launch calculatorTest your numbers in the FBA Storage & Aged Inventory Calculator
Apply the formulas above with your actual selling price, package dimensions, and volume.
Frequently asked questions
When are monthly storage fees billed?
Storage fees are assessed between the 7th and 15th day of the month following the month for which fees were incurred.
How can I prevent Q4 peak storage shock?
Drip-feed inventory using frequent LTL shipments rather than sending a 4-month mega shipment in September.