Amazon Inventory Performance Index (IPI) in 2026: How to Improve Your Score and Avoid Storage Limits
Introduction
For sellers using Amazon FBA, inventory management has become more important than ever. As Amazon continues to tighten fulfillment policies in 2026, sellers must maintain efficient inventory control to avoid penalties and operational restrictions. One of the most critical metrics Amazon uses to evaluate seller performance is the Amazon Inventory Performance Index (IPI).
The Amazon IPI score measures how effectively sellers manage their FBA inventory. This score directly impacts how much storage space sellers receive in Amazon fulfillment centers. A low IPI score can lead to serious limitations such as reduced storage capacity, higher storage fees, and restricted ability to send new inventory to warehouses.
Many sellers struggle with inventory performance because they do not fully understand how Amazon calculates the Inventory Performance Index. Factors such as excess inventory, low sell-through rates, stranded listings, and poor stock management can quickly lower the score.
Improving your Amazon Inventory Performance Index is essential for maintaining healthy inventory flow and scaling your business. Sellers who actively optimize their Amazon inventory performance can unlock higher storage limits and avoid costly operational bottlenecks.
In this guide, we’ll explain how the Amazon IPI score works in 2026, how it is calculated, and the proven strategies sellers can use to improve their IPI score and avoid FBA storage limits.
What is the Amazon Inventory Performance Index (IPI)?
The Amazon Inventory Performance Index (IPI) is a score that measures how efficiently sellers manage their Fulfillment by Amazon (FBA) inventory. The Amazon IPI score ranges from 0 to 1000, and it reflects how well a seller balances inventory levels, maintains product availability, and avoids issues such as excess or stranded stock.
If you are wondering what the Amazon Inventory Performance Index is, it is essentially Amazon’s way of evaluating how effectively sellers use its warehouse space. Since Amazon operates a massive global fulfillment network, it needs sellers to maintain efficient inventory practices to prevent overcrowded warehouses and slow-moving stock.
Amazon introduced the FBA IPI system to encourage sellers to improve inventory planning, reduce excess inventory, and maintain steady product turnover. Efficient inventory management helps Amazon ensure faster delivery times, better warehouse utilization, and improved customer experience.
The Amazon IPI score directly impacts sellers’ operational flexibility. Sellers with high IPI scores are rewarded with higher FBA storage limits, allowing them to send and store more inventory in Amazon fulfillment centers. On the other hand, sellers with low scores may face restrictions such as reduced storage capacity and limitations on restocking products.
For example, a seller with a strong IPI score can maintain larger product quantities in Amazon warehouses, while a seller with a low score may struggle to replenish inventory during peak demand periods.
Amazon updates the Inventory Performance Index every week using a rolling 13-week performance period, meaning your recent inventory management decisions continuously influence your score. Understanding how Amazon FBA IPI works is the first step toward improving your inventory performance and avoiding costly storage restrictions.
How Amazon Calculates IPI in 2026
Understanding the Amazon IPI calculation is essential for improving inventory performance and avoiding storage restrictions. In 2026, the Amazon Inventory Performance Index (IPI) is primarily determined by four key Amazon FBA inventory metrics that measure how efficiently sellers manage their stock inside Amazon fulfillment centers.
1. Excess Inventory Percentage
Excess inventory refers to products that remain in Amazon warehouses for long periods without selling. When inventory sits too long, it occupies valuable warehouse space and increases storage costs.
Amazon detects excess inventory by analyzing sales velocity and how long products remain in storage compared to demand forecasts. Listings with slow-moving stock or poor sales history are often categorized as excess inventory.
A high excess inventory percentage can significantly lower your Amazon IPI score because it signals inefficient inventory planning and warehouse congestion.
2. Sell-Through Rate
The sell-through rate measures how quickly your products sell compared to the amount of inventory stored. It is one of the most important factors affecting the IPI score.
The basic formula concept is:
Sell-Through Rate = Units Sold ÷ Average Inventory Stored
A higher sell-through rate indicates strong demand and efficient inventory management. Sellers who consistently move inventory quickly typically maintain higher IPI scores.
On the other hand, low sell-through rates suggest poor demand forecasting or overstocking, which negatively impacts inventory performance.
3. Stranded Inventory
Stranded inventory refers to products stored in Amazon fulfillment centers that cannot be sold because of listing issues.
Common causes include:
- Suppressed or inactive listings
- Pricing errors
- Missing product information
- Listing policy violations
Since stranded inventory occupies warehouse space without generating sales, Amazon penalizes sellers for it. Fixing stranded listings quickly is essential to maintaining a healthy Amazon FBA IPI score.
4. FBA In-Stock Rate
The FBA in-stock rate measures how consistently your best-selling products remain available for purchase.
Frequent stockouts can lead to:
- Lost sales opportunities
- Lower customer satisfaction
- Reduced ranking in search results
Amazon rewards sellers who maintain stable inventory levels for high-demand products.
Key takeaway: Improving these four Amazon FBA inventory metrics—excess inventory, sell-through rate, stranded inventory, and in-stock rate—directly helps improve your Amazon Inventory Performance Index (IPI).
Why IPI Score Matters for Amazon Sellers
The Amazon Inventory Performance Index (IPI) is more than just a performance metric—it has a direct impact on how efficiently sellers can operate and grow their Amazon business. A strong Amazon IPI score gives sellers more flexibility, while a low score can create serious operational challenges.
Storage Limits
One of the biggest consequences of a low IPI score is restricted FBA storage capacity. Amazon uses the IPI to determine how much inventory sellers can store in its fulfillment centers.
If your Amazon FBA IPI score drops below the recommended threshold, Amazon may limit the number of units you can send to warehouses. This can make it difficult to restock popular products or maintain healthy inventory levels.
For example, a seller with a low IPI score might only be allowed to store 500–1000 units, even if demand for their products is much higher.
Higher Storage Fees
Poor inventory performance can also lead to increased operational costs. When sellers hold slow-moving stock for long periods, Amazon may charge additional fees such as:
- Long-term storage fees
- Aged inventory surcharges
These extra costs can significantly reduce profit margins, especially for sellers with large product catalogs.
Slower Business Growth
Low IPI scores can prevent sellers from scaling their business effectively. Storage restrictions make it harder to:
- Launch new products
- Expand inventory for existing products
- Prepare for seasonal demand spikes
Without enough warehouse space, sellers may miss valuable sales opportunities.
Competitive Disadvantage
Sellers with strong Amazon inventory performance gain a major competitive advantage. High-IPI sellers benefit from:
- Higher storage limits
- Faster fulfillment operations
- Consistent product availability
Meanwhile, sellers with low IPI scores often struggle to compete because they cannot store or restock enough inventory to meet customer demand.
Common Mistakes That Lower IPI Scores
Many sellers unintentionally harm their Amazon Inventory Performance Index (IPI) because they do not fully understand how Amazon evaluates inventory performance. Poor inventory decisions, lack of monitoring, and inefficient demand planning can quickly reduce an Amazon IPI score and lead to storage restrictions.
Overstocking Slow-Moving Products
One of the most common mistakes sellers make is sending too much inventory to Amazon warehouses without validating real product demand.
When products do not sell quickly, they remain in storage for extended periods. This results in:
- Excess inventory accumulation
- Higher storage costs
- Lower sell-through rate
Since excess inventory is one of the main factors affecting the Amazon IPI score, overstocking slow-moving products can significantly damage inventory performance.
Ignoring Stranded Listings
Another major issue is stranded inventory, which occurs when products cannot be sold due to listing problems.
Common causes include:
- Suppressed listings
- Missing product images
- Incorrect pricing
- Incomplete product information
Many sellers fail to regularly check for stranded listings, allowing unsellable inventory to sit in warehouses and negatively impact their Amazon FBA IPI score.
Poor Demand Forecasting
Effective inventory management requires accurate demand forecasting. Without it, sellers may either overstock or run out of inventory.
Both situations can hurt IPI:
- Overstocking creates excess inventory
- Stockouts reduce in-stock rate and sales momentum
Proper demand forecasting helps maintain a healthy balance between inventory availability and sales velocity.
Keeping Unsellable Inventory
Some sellers continue storing products that are unlikely to sell due to:
- Poor customer reviews
- Low market demand
- Outdated product versions
Instead of holding these products in storage, sellers should consider removing them, liquidating them, or offering discounts to clear the inventory.
Ignoring Amazon Inventory Dashboard
Amazon provides several powerful tools to help sellers monitor inventory performance, including:
- FBA Inventory Dashboard
- Inventory Planning page
- Restock recommendations
These tools offer valuable insights into inventory health, but many sellers fail to use them regularly. Ignoring these resources can lead to missed opportunities to fix issues before they lower the Amazon Inventory Performance Index.Top of Form
Practical Strategies to Improve Your Amazon IPI Score
Improving your Amazon Inventory Performance Index (IPI) requires consistent monitoring and smart inventory management decisions. Sellers who actively optimize their Amazon FBA inventory metrics can maintain healthy stock levels, avoid storage restrictions, and increase operational efficiency. Below are some practical strategies that can help improve your Amazon IPI score.
1. Fix Stranded Inventory Immediately
Stranded inventory directly impacts your Amazon inventory performance because these products cannot be sold even though they are stored in Amazon warehouses.
Sellers should check for stranded inventory every week and resolve issues quickly. Common problems include:
- Suppressed or inactive listings
- Pricing errors
- Missing product details or images
By fixing these issues promptly, you allow the inventory to become sellable again, which helps improve your Amazon IPI score and prevents warehouse space from being wasted.
2. Improve Sell-Through Rate
The sell-through rate is one of the most important factors affecting your IPI score. The faster your products sell, the more efficient your inventory performance becomes.
You can improve sell-through rates by:
- Running promotions or limited-time discounts
- Optimizing pricing based on competitor analysis
- Improving product listing conversion rates
Higher sales velocity means inventory moves faster through Amazon warehouses, which positively impacts your Amazon FBA IPI score.
3. Remove Excess Inventory
Excess inventory sitting in warehouses for long periods lowers your Inventory Performance Index. Sellers should regularly evaluate slow-moving products and take action.
Options for reducing excess inventory include:
- Creating Amazon removal orders to return inventory
- Using Amazon liquidation programs
- Running discount campaigns to clear old stock
Reducing excess inventory frees up warehouse space and improves your Amazon inventory performance metrics.
4. Improve Demand Forecasting
Accurate demand forecasting helps sellers maintain the right inventory levels. Without proper forecasting, sellers risk overstocking or running out of inventory.
Better forecasting can be achieved by analyzing:
- Past sales data
- Seasonal demand trends
- Amazon restock recommendations
These insights help sellers maintain consistent stock levels and avoid inventory problems that negatively impact the Amazon IPI score.
5. Optimize Product Listings
Better product listings can significantly improve conversion rates, which leads to faster inventory turnover.
Sellers should focus on improving:
- High-quality product images
- A+ content for brand storytelling
- Clear and optimized product titles
- Relevant keywords for search visibility
When listings convert more visitors into buyers, inventory moves faster, improving overall Amazon inventory performance.
6. Use Inventory Management Tools
Professional sellers often rely on specialized tools to monitor their inventory performance. These tools provide deeper insights into Amazon FBA inventory metrics and help sellers make better decisions.
Useful tools include:
- Inventory forecasting software
- Sales analytics platforms
- Amazon inventory performance reports
Using these tools allows sellers to track trends, identify inventory risks early, and continuously improve their Amazon Inventory Performance Index (IPI).
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Ideal IPI Score Targets for 2026
Understanding the right Amazon Inventory Performance Index (IPI) target helps sellers maintain healthy inventory operations and avoid unnecessary restrictions. Since the Amazon IPI score ranges from 0 to 1000, sellers should aim for a score that provides enough operational flexibility for their business.
In general, the following ranges help sellers evaluate their inventory performance:
- Below 400 → High Risk
Sellers with an IPI score below 400 are likely to face FBA storage limits and inventory restrictions. This makes it difficult to send new products to Amazon warehouses or restock existing ones. - 400 – 500 → Average Performance
This range indicates moderate inventory management. Sellers in this range may avoid strict restrictions but still have limited flexibility compared to higher-performing sellers. - 500 – 600 → Good Inventory Management
Sellers with IPI scores in this range demonstrate strong Amazon inventory performance. Their inventory moves efficiently, and they typically receive higher storage capacity. - 600+ → Excellent Performance
High-performing sellers usually maintain an IPI score above 600. This indicates excellent inventory planning, strong sell-through rates, and minimal excess or stranded inventory.
Amazon generally expects sellers to maintain an IPI score of around 400 or higher to avoid strict storage limits. However, sellers aiming for long-term growth should target 600+ IPI to gain maximum flexibility in storing and restocking inventory.
Best Tools for Managing Amazon Inventory
Managing inventory efficiently is essential for maintaining a strong Amazon Inventory Performance Index (IPI). As businesses grow and product catalogs expand, manually tracking inventory becomes difficult. This is why many professional sellers rely on specialized Amazon inventory management tools to monitor stock levels, forecast demand, and improve overall inventory performance.
Inventory Management Software
Inventory management software helps sellers track product quantities across Amazon fulfillment centers and warehouses. These tools automate stock monitoring and provide real-time insights into inventory health.
Key benefits include:
- Automated inventory tracking
- Low-stock alerts
- Better warehouse planning
This helps sellers avoid both overstocking and stockouts, which directly improves their Amazon IPI score.
Demand Forecasting Tools
Demand forecasting tools analyze historical sales data and market trends to predict future product demand. Accurate forecasting allows sellers to send the right amount of inventory to Amazon warehouses.
Benefits include:
- Data-driven demand predictions
- Seasonal sales forecasting
- Better restock planning
This helps prevent excess inventory while ensuring popular products stay in stock.
Sales Analytics Tools
Sales analytics platforms provide detailed insights into product performance, customer demand, and sales velocity. These tools help sellers identify which products sell quickly and which ones may become slow-moving inventory.
By using sales analytics and inventory forecasting tools, sellers can make smarter inventory decisions, maintain efficient stock levels, and continuously improve their Amazon Inventory Performance Index (IPI).
Conclusion: Mastering IPI for Long-Term Amazon Growth
Succeeding on Amazon in 2026 requires more than just launching great products or running effective marketing campaigns. Sellers must also focus on efficient inventory management to maintain a healthy Amazon Inventory Performance Index (IPI) and avoid operational limitations.
A low Amazon IPI score can create several challenges for sellers, including strict FBA storage limits, higher inventory storage fees, and missed sales opportunities due to poor stock management. When sellers fail to manage their inventory effectively, excess products accumulate in warehouses, slow-moving items increase costs, and stockouts reduce customer satisfaction.
Improving your Inventory Performance Index requires a strategic approach. Sellers should consistently monitor key performance factors such as sell-through rate, inventory levels, listing health, and demand forecasting. Maintaining balanced inventory levels ensures that products sell quickly while avoiding excess stock that occupies valuable warehouse space.
Successful Amazon sellers treat inventory as a core part of their business strategy. By actively managing stock levels, optimizing product listings, and using data-driven forecasting, sellers can continuously improve their Amazon inventory performance.
In 2026, the most successful Amazon businesses are not just focused on selling products—they are focused on managing inventory intelligently, maintaining strong IPI scores, and building a sustainable system that supports long-term growth and scalability.
