Boost your operational intelligence and create smarter,
more effective processes in USA and WORLD WIDE.
Boost your operational intelligence and create smarter,
more effective processes in USA and WORLD WIDE.
In many cases, hidden costs in Amazon FBA become a silent threat to sellers’ margins. Although the system offers logistics advantages and greater visibility within the world’s largest marketplace, behind that structure lies a framework of fees, surcharges, and penalties that can weigh on profit.
These costs often occur in sequence, deepening the financial impact of the operation. Inventory that does not move on time can lead to higher storage fees, trigger aged-inventory penalties, and at the same time tie up working capital that the seller needs to replenish better-performing products.
That is why understanding how each of these additional costs works is key to assessing the real exposure associated with selling through Amazon FBA and preventing profitability from being constrained by expenses that, in many cases, go unnoticed at the outset.
Aged Inventory Surcharges begin to apply once products have been in storage for 181 days or more and increase over time. In the 6- to 12-month range, the fee is US$0.30 per unit per month, twice the 2025 rate. For goods stored for more than 15 months, the charge can reach US$7.90 per cubic foot or US$0.35 per unit.
This is added to the standard monthly storage fee during the low season, set at US$2.40 per cubic foot for standard-size items, along with storage utilization surcharges, which can reach US$1.88 per cubic foot when inventory exceeds 52 weeks. In practice, this can result in very high monthly charges. For example, 150 units occupying 1 cubic foot each, stored for more than 365 days, can amount to roughly US$1,035 per month.
These charges are accompanied by additional penalties that further raise operating expenses. One example is the Low Inventory Fee, which ranges from US$0.32 to US$2.09 per unit when an FNSKU falls short of 28 days of stock coverage. The fee now also applies to bulky items.
At the same time, inbound defect penalties have increased sharply, rising from US$0.32 to US$5.72 per unit, with jumps of 10 to 80 times previous levels. In addition, since January 2026, Amazon FBA has stopped reimbursing certain preparation and labeling costs. Sellers may also face space overuse surcharges ranging from US$0.44 to US$1.88 per cubic foot, along with inventory removal fees of US$1.04 to US$14.32 per unit.
Slow-moving inventory ties up working capital for extended periods. A product stored during the low season carries a base cost of US$2.40 per cubic foot, rising to US$3.63 in the fourth quarter, excluding any additional surcharges.
At the same time, an Inventory Performance Index (IPI) below 500 can restrict storage capacity. This forces sellers to operate between two risks: overstocking or stockouts, both of which affect cost structures and sales performance. In parallel, fulfillment fees are also rising, with an average increase of around US$0.08 per unit, reaching as much as US$0.51 for products priced above US$50.
AeroWork positions itself as a logistics partner that complements Amazon FBA operations and supports companies to run more efficiently.
One of the foundations of AeroWork’s model is its US logistics infrastructure, including a Miami warehouse that serves as an inventory management and preparation center. This hub allows brands to manage stock outside Amazon and send replenishment shipments in a planned manner, thereby avoiding penalties tied to excess inventory and long-term storage within the Amazon FBA logistics network.
As a result, companies can store goods, organize shipments, and supply Amazon fulfillment centers based on actual demand. This leads to more predictable inventory movement, reduced exposure to additional charges, and improved stock turnover.
AeroWork delivers an adaptable warehousing model, with no minimum inventory requirements and a prorated billing structure based on the square footage actually used. This allows both growing brands and established sellers to manage inventory without committing to large amounts of space or taking on unnecessary fixed costs. At the same time, this service makes it easier to adjust logistics activity in line with business performance or sales seasonality.
In addition, AeroWork serves as an operational extension of the seller’s team. Through what it calls remote support, the warehouse can conduct physical inspections, quality reviews, and product checks in less than 24 hours. This gives brands the ability to oversee inventory without maintaining their own staff in the United States, while retaining full visibility over their goods even at a distance.
To learn more about our services and assess ways to improve your operation, you can contact AeroWork for guidance and review a solution tailored to your brand’s needs.