2026 FBA Long-Term Storage: Miss 181 Days, Double Your Costs!

Why You Need to Know This Now Amazon consistently updates its FBA policies, pushing sellers towards more efficient inventory management. In 2026, long-term inventory storage policies are tightening even further, and failing to understand these changes could result in significant additional costs. Historically, Long-Term Storage Fees were applied to inventory stored for over 365 days. In 2022, this was rebranded as the Aged Inventory Surcharge, and come 2026, the trigger point will be drastically shortened to 181 days.

Furthermore, the per-unit surcharge for inventory stored between 12 and 15 months (365-450 days) has doubled compared to 2025, and a new, higher surcharge tier has been introduced for inventory aged over 15 months. These changes clearly signal Amazon's intent to utilize FBA warehouses as a rapid fulfillment network, not for long-term storage. Therefore, sellers must prioritize increasing inventory turnover and swiftly moving out older stock.

3 Key Rules

1. Master the 181-Day Aged Inventory Surcharge Threshold Starting in 2026, inventory stored in FBA warehouses for over 181 days will begin to incur the Aged Inventory Surcharge. This can be a critical change for sellers accustomed to the previous 271-day or 365-day thresholds. Since the surcharge is applied on the 15th of each month, it's crucial to regularly monitor your inventory age and take proactive steps before your stock hits the 181-day mark.

2. Understand Surcharge Rates and Calculation by Inventory Age The Aged Inventory Surcharge is applied as either a per-cubic-foot or a per-unit fee, whichever amount is higher. For smaller items, the per-unit fee might be higher, while for bulkier products, the per-cubic-foot rate could be more impactful. You'll need to consider your product's specific characteristics. 181 to 270 days: $1.50 per cubic foot 271 to 365 days: $3.80 per cubic foot 12 to 15 months (365-450 days): The greater of $0.30 per unit or $6.90 per cubic foot Over 15 months: The greater of $0.35 per unit or $7.90 per cubic foot Remember, these surcharges are in addition to your regular Monthly Storage Fees. For 2026, standard-size products will incur monthly storage fees of $0.78 per cubic foot during the off-peak season (January-September) and $2.40 per cubic foot during peak season (October-December).

3. Manage Your IPI (Inventory Performance Index) Score Your IPI score is a critical metric directly tied to your FBA storage limits. The minimum IPI score for 2026 is 400; falling below this will restrict new inventory shipments and make it difficult to secure additional storage space. Your IPI score is determined by four key factors: Excess Inventory, Sell-through Rate, Stranded Inventory, and the In-stock Rate for replenishable ASINs.

Consequences of Non-Compliance Overlooking the Aged Inventory Surcharge policy can lead to several negative impacts on your business:

Eroding Profitability: Unexpectedly high and recurring surcharges will eat into your product margins, significantly reducing overall profitability. Storage Limits and Inbound Restrictions: A declining IPI score will cap the amount of inventory you can store in Amazon's warehouses, potentially even rejecting inbound shipments for your best-selling products. Lost Sales Opportunities: Running out of stock means missing out on sales, which directly translates to reduced revenue and a weaker competitive position in the market. Avoidable Additional Costs: If you have to process inventory through a Removal Order or Liquidation, you'll incur additional fees, further impacting your bottom line.

3 Practical Action Items Take immediate action to minimize your risk of incurring long-term storage surcharges.

1. Regularly Review Your Inventory Age Report: In Seller Central, navigate to Inventory → Inventory Planning → Inventory Age. Check this report weekly or monthly to identify inventory that is already over 181 days old or approaching the 181-day mark. 2. Develop and Execute a Strategy for Slow-Moving Inventory: You need to be decisive about clearing out old stock. Consider strategies like discount promotions, leveraging Amazon Ads to boost sales, or bundling products. If selling proves difficult, explore creating a Removal Order to have the inventory returned to you, or utilize the FBA Liquidation program to recover some of your costs. 3. Monitor and Improve Your IPI (Inventory Performance Index) Score: Access your IPI score and key metrics like Excess Inventory and Sell-through Rate via the Performance → Account Health → Inventory Performance dashboard in Seller Central. Continuously monitor these indicators and focus on reducing excess inventory and increasing your sell-through rate. Aim to maintain an IPI score above 400 (ideally above 550).

2 Common Mistakes to Avoid

1. Managing Inventory Based on Outdated Policies (365-Day Rule): Many sellers still operate under the assumption that long-term storage fees kick in after 365 days. However, starting in 2026, the surcharge will be applied after a much shorter period of 181 days. It's imperative to adjust your inventory planning to align with this new standard. 2. Underestimating Inventory Disposal Costs: Sometimes, sellers decide to remove or liquidate inventory at the last minute to avoid long-term storage surcharges. However, these disposal processes also incur costs. It's crucial to compare the potential surcharge against the cost of disposal to choose the most efficient method. For instance, considering the 12-15 month per-unit surcharge ($0.30) versus a small-standard removal fee ($0.84), it might be more cost-effective to remove the item if you anticipate storing it for more than approximately three additional months. Ultimately, the most critical step is to maintain appropriate inventory levels through accurate sales forecasting before your stock starts to accumulate.