2026 Low Inventory Fee: Beware the Hidden Cost Bomb!

Amazon FBA currently charges a Low-Inventory-Level Fee on a per-individual FNSKU (product variation) basis. This can lead to unexpected cost increases and lost sales opportunities, making meticulous inventory management crucial.

What is the Low Inventory Fee?

The recently introduced FBA Low Inventory Fee has changed its calculation method to be based on individual FNSKUs (product variations) as of now.

Previously: Fees were determined based on the inventory level of the entire product (Parent ASIN). Now: If a specific variation (FNSKU), such as a particular color or size, has low stock, a fee will be charged.

This change significantly impacts sellers with products that have multiple variations (variants), especially in categories like apparel or beauty. Even if your overall inventory seems sufficient, a shortage in a specific variation can trigger an unexpected cost bomb. Amazon has strengthened this policy to encourage efficient inventory operations and maintain fast delivery for customers, directly affecting seller profitability.

Fee Application Criteria

The fee is applied to each sale of an FNSKU if its inventory level meets one of the following criteria:

Maintains less than 28 days of supply based on the past 7 days of sales. Maintains less than 28 days of supply based on the past 30 days of sales.

How the Fee is Calculated

The Low Inventory Fee is charged per unit, and the rate varies depending on the product's size and weight tier.

Small Standard products: approximately $0.16 Standard products: approximately $0.32 Oversize products: $0.50 or more

Exemption Conditions

The Low Inventory Fee may be waived under the following conditions:

New FBA sellers: exempt for the first 365 days Specific New-to-FBA products Products with very slow sales velocity Grocery products

⚠️ Always check Amazon Seller Central for the most up-to-date exemption conditions.

Key Impacts and Risks

The Low Inventory Fee can have the following negative impacts on a seller's business:

Unexpected Additional Costs: If a specific variation of a high-selling product runs out of stock, significant Low Inventory Fees can accumulate monthly, drastically reducing your net profit. Some sellers have even reported losing 10% of their revenue from a single SKU due to these fees. Lost Sales Opportunities and Poor Customer Experience: Low inventory prevents customers from purchasing their desired product variations, leading directly to lost sales. This can also result in a drop in product search rankings and lower conversion rates. Decreased IPI Score and Storage Limit Restrictions: Low inventory can also negatively impact your IPI (Inventory Performance Index) score. A low IPI score can lead to restricted storage limits, which negatively affects overall inventory management and can cause significant difficulties for future inventory operations.

Strategies to Avoid the Low Inventory Fee

1. Enhance FNSKU-Level Inventory Monitoring: Regularly check the inventory status, sales velocity, and estimated Days of Supply for each FNSKU (individual variation) on your Seller Central "Inventory → FBA Inventory" page. Pay close attention to FNSKUs where the Days of Supply drops below 28 days. 2. Utilize the Restock Inventory Report: Access the "Inventory → Inventory Planning → Restock Inventory" path to view Amazon's recommended restock times and quantities for each FNSKU. It's advisable to plan to maintain at least 30-60 days of inventory. 3. Factor in Demand Forecasting and Lead Time: Analyze past sales data, seasonality, and promotional plans to comprehensively forecast future demand for each FNSKU. Develop a strategy to secure inventory in advance, thoroughly considering the Lead Time from your supplier to Amazon's fulfillment centers. You might also consider air freight options for urgent inventory replenishment.

Common Mistakes to Avoid

Managing Inventory Only at the Parent ASIN Level: Many sellers mistakenly assume their overall product (Parent ASIN) inventory is sufficient and overlook shortages in individual variations (FNSKUs). Since fees are currently charged at the FNSKU level, meticulous management of each variation is essential. Unawareness of the Low Inventory Fee's Existence: Many sellers are only wary of Long-Term Storage Fees or Aged Inventory Surcharges and are either unaware of the Low Inventory Fee or underestimate its significance. This fee is charged per sale and can accumulate to a much larger amount than anticipated.

The Hidden Cost of Testing Small

The low-inventory fee we covered above is often decided long before it ever shows up on a statement — at the moment you choose your shipment quantity. Many first-time sellers I've seen plan to send in just 10 or 20 units to test the waters. I understand the instinct, but Amazon operates more than 600 fulfillment centers across the US. Spread across that network, a dozen units put you in a low-inventory state from day one, and the sales data you collect is too thin to mean anything. What felt like a cautious test ends up creating exactly the conditions this fee is built to catch.

That is why I tell sellers that even a first test run should be planned in units of 500 to 1,000. Yes, that means real upfront capital and lead time, and it is fair to say this makes the start harder for new sellers. But cutting the quantity to avoid that commitment also cuts away the evidence you need to make decisions.

Before you finalize an inbound plan, check the following:

Is this shipment large enough to stay above low-inventory thresholds once it is distributed across the warehouse network? Will this quantity actually generate enough sales data to judge demand? Have you budgeted the capital and lead time for a 500-to-1,000-unit shipment in your business plan?

It is far easier to design a quantity structure the fee cannot touch than to memorize the fee table after the fact.