Get your Amazon FBA inventory performance index on track

This article gives you a clear, actionable guide to Amazon FBA inventory performance index (IPI) in 2026. You'll learn why IPI matters, how it's calculated, how to evaluate your score, common pitfalls to avoid, and practical steps to improve your IPI and keep your cross-border e-commerce business running smoothly.

Why Amazon FBA Inventory Performance Index (IPI) Matters in 2026

In 2026, Amazon FBA inventory performance index (IPI) remains a critical metric for sellers using Fulfillment by Amazon. It directly impacts your storage limits, which can make or break your cross-border e-commerce operations. A low IPI score can lead to overage fees, restricted storage, and even suspension of your FBA privileges. For buyers, a seller's IPI indirectly affects product availability and delivery times—if a seller runs out of stock due to poor IPI, you face longer waits or canceled orders.

This guide will walk you through what IPI is, how it's calculated, and what you can do to improve it. Whether you're a seasoned seller or just starting out, understanding IPI is essential for maintaining healthy inventory levels and avoiding costly penalties. We'll cover key categories, evaluation criteria, common pitfalls, and practical recommendations to help you stay ahead in 2026.

• IPI score ranges from 0 to 1000, with 400 as the typical threshold for unlimited storage (subject to change).
• Amazon evaluates IPI every quarter (Q1, Q2, Q3, Q4) and adjusts storage limits accordingly.
• A low IPI can trigger a storage limit of 10 cubic feet or 100 units, severely limiting your sales potential.

Key Components of Amazon FBA IPI: What You Need to Know

Amazon's IPI is calculated based on four main factors: excess inventory, sell-through rate, stranded inventory, and in-stock rate. Each factor contributes to your overall score, and understanding them is the first step to improvement.

Excess inventory refers to items that are overstocked relative to demand. Amazon measures this by looking at your inventory age and how many units you have versus sales velocity. Sell-through rate is the number of units sold over a period, divided by the average number of units in stock. A higher sell-through rate indicates better demand matching. Stranded inventory is stock that is listed but not buyable due to listing issues, such as missing images or incorrect details. Finally, in-stock rate tracks how often your popular items are available for purchase—low in-stock rates hurt your IPI because they signal poor demand forecasting.

Each factor is weighted, but Amazon doesn't disclose exact formulas. However, focusing on these areas will generally improve your score. For example, a seller with a high excess inventory ratio and low sell-through will see a lower IPI than one who keeps inventory lean and moves products quickly.

• Excess inventory: aim for inventory age under 90 days to avoid penalties.
• Sell-through rate: a rate above 70% is considered healthy for most categories.
• Stranded inventory: regularly audit your listings to ensure all are active and buyable.
• In-stock rate: maintain at least 90% in-stock for your top-selling products.

How to Evaluate Your IPI: Criteria and Trade-offs

Evaluating your IPI isn't just about checking your score—you need to understand the trade-offs between different strategies. For instance, maintaining a high in-stock rate requires holding more inventory, which can increase excess inventory if demand drops. Conversely, keeping inventory lean reduces excess but risks stockouts, hurting in-stock rate. The key is to find a balance based on your product's demand volatility.

When assessing your IPI, look at the breakdown Amazon provides in Seller Central. Pay attention to which factors are dragging your score down. For example, if excess inventory is your weak point, you might need to run promotions or create bundled deals to move stock faster. If stranded inventory is an issue, fix your listings promptly. You can also use Amazon's Inventory Planning dashboard to simulate changes and see potential IPI improvements.

Trade-offs also exist in terms of costs. Removing excess inventory can incur disposal fees or return shipping costs. Increasing inventory to boost in-stock rate may tie up capital. So, evaluate the cost of corrective actions against the cost of a low IPI (e.g., higher storage fees, lost sales due to limits). For many sellers, a moderate IPI score (400-500) is sufficient to avoid restrictions, so you don't need to chase a perfect 1000.

• Check your IPI score and factor breakdown in Seller Central every week.
• Set a target IPI above 450 to have a safety margin against quarterly changes.
• Use Amazon's Inventory Performance dashboard to test 'what-if' scenarios.
• Consider using third-party tools like InventoryLab or SellerLegend for deeper analytics.

Common Pitfalls When Managing Your IPI

Many sellers make avoidable mistakes that hurt their IPI. One common pitfall is ignoring outdated inventory. If you have products that haven't sold in 90+ days, they're considered excess and drag down your score. Instead of letting them sit, create removal orders or run clearance sales.

Another pitfall is failing to react to seasonal demand. For example, a seller who overstocks winter items in Q1 will see excess inventory in Q2, lowering IPI. Conversely, understocking during peak seasons can lead to low in-stock rates, also hurting IPI. Use historical data and Amazon's forecasting tools to plan.

Additionally, some sellers neglect stranded inventory, assuming Amazon will fix it automatically. That's not the case—you must regularly check your Inventory Dashboard for 'Stranded' and resolve listing issues. Finally, don't set and forget your IPI; Amazon updates scores quarterly, and your strategy should adapt to changes in your product performance and market trends.

• Don't ignore excess inventory; set up automatic removal for items older than 180 days.
• Avoid overstocking based on optimistic sales projections—use conservative estimates.
• Monitor stranded inventory at least once a week and fix issues immediately.
• Adjust your inventory strategy before each quarter ends to impact the next IPI update.

Practical Recommendations and Next Steps

To keep your IPI on track, start by conducting a thorough audit of your current inventory. Identify items with high excess and slow sell-through, and create a plan to sell or remove them. Next, improve your demand forecasting by using Amazon's historical data and external trends (e.g., Google Trends, social media).

Implement a regular review process: check your IPI score every week, and at the end of each quarter, analyze what changed and why. Use Amazon's Inventory Planning tools to set restock alerts and automate removal for unsold items. Also, consider diversifying your product line to reduce reliance on a few high-volume items, which can stabilize your in-stock rate.

Finally, stay informed about policy updates. IPI thresholds and calculation methods can change, so subscribe to Amazon seller newsletters or join forums. For cross-border e-commerce sellers, also consider using third-party logistics (3PL) for overflow inventory to avoid FBA storage limits, but weigh the costs and benefits. By taking these steps, you'll not only improve your IPI but also optimize your overall supply chain efficiency.

• Audit your inventory monthly and remove slow movers.
• Use Amazon's restock recommendations and set reorder points.
• Consider using a 3PL for excess stock to free up FBA space.
• Stay updated with Amazon's IPI policy changes via Seller Central announcements.

Key Takeaways

In summary, maintaining a healthy Amazon FBA IPI is essential for avoiding storage limits and extra fees. Focus on reducing excess inventory, improving sell-through, fixing stranded inventory, and maintaining a good in-stock rate. Regularly monitor your score, adapt to seasonal changes, and stay updated on policy changes. Start by auditing your inventory today, and implement the recommendations to ensure your IPI stays on track for 2026 and beyond.

This article is compiled by kuajing168.cn for reference only. Please refer to the official announcements of each platform for the latest policies and rates.