Amazon FBA Long-Term Storage Fee Calculator
Estimate your Amazon FBA aged inventory surcharges and plan removals before costs spiral.
Storage Fee Calculator
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Monthly Breakdown
| Month | Age (Days) | Fee Tier | Monthly Surcharge |
|---|
What are Aged Inventory Surcharges?
Amazon charges escalating surcharges on inventory that sits in fulfillment centers for more than 180 days. These aged inventory surcharges (AIS) replaced the old long-term storage fee system in 2023 and are charged monthly in addition to regular monthly storage fees.
The surcharges increase at three tiers: 181–270 days, 271–365 days, and 365+ days. For each tier, Amazon charges the greater of a per-cubic-foot rate or a per-unit minimum. These fees can completely destroy margins on slow-moving inventory if not managed proactively.
How Aged Inventory Surcharges are Calculated
Amazon charges the greater of two rates at each tier:
181–270 days: MAX(Volume_ft³ × $0.50, Units × $0.15)
271–365 days: MAX(Volume_ft³ × $1.50, Units × $0.15)
365+ days: MAX(Volume_ft³ × $3.00, Units × $0.15)
Worked example: 200 units at 0.3 ft³ each, sitting for 300 days:
- Total volume: 200 × 0.3 = 60 ft³
- Tier: 271–365 days ($1.50/ft³ or $0.15/unit)
- Volume-based: 60 × $1.50 = $90.00
- Unit-based: 200 × $0.15 = $30.00
- Monthly surcharge: MAX($90, $30) = $90.00/month
Understanding Your Results
Aged inventory surcharges escalate quickly. Here's what to watch for:
- Under 181 days: No aged inventory surcharge applies — only regular monthly storage fees
- 181–270 days: Surcharges begin. Consider running promotions or lowering prices to move inventory
- 271–365 days: Surcharges triple. Evaluate whether a removal order or liquidation makes more financial sense
- 365+ days: Maximum surcharge tier. Almost always cheaper to remove or destroy than to continue storing
Frequently Asked Questions
Amazon charges aged inventory surcharges monthly on any inventory that has been in a fulfillment center for more than 180 days. The surcharge is calculated on the 15th of each month based on inventory age as of that date. These surcharges are in addition to the regular monthly storage fee that applies to all FBA inventory.
Amazon calculates the surcharge as the greater of two amounts: a per-cubic-foot rate (which increases at each tier) or a per-unit minimum of $0.15. The per-cubic-foot rates are $0.50 for 181–270 days, $1.50 for 271–365 days, and $3.00 for inventory older than 365 days.
The best strategies are: send smaller, more frequent shipments to keep inventory fresh; run promotions or reduce prices before the 180-day mark; set up automatic removal orders for slow-moving inventory; use Amazon’s FBA Inventory Age report to track which ASINs are approaching fee thresholds.
Monthly storage fees apply to ALL FBA inventory regardless of age (typically $0.75–2.40 per cubic foot depending on time of year and size tier). Aged inventory surcharges are ADDITIONAL fees that only apply to inventory older than 180 days. Both are charged, so old inventory faces a double cost.
Compare the removal cost ($0.50–1.00 per unit) plus any remaining value against the ongoing monthly surcharge. If the surcharge per unit exceeds the product margin, removal is the better financial decision. For 365+ day inventory, removal almost always makes sense unless the product has very high value.
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