Amazon Inventory Performance Index (IPI) Changes: Your Tactical Guide to Protecting Storage Capacity and Margins

The Amazon Inventory Performance Index (IPI) used to be a suggestion. Now it is the gatekeeper between you and warehouse space.

Fall below the threshold, and Amazon slaps storage restrictions on your account faster than you can liquidate excess stock. Miss the mark during peak season, and you are fighting for scraps while competitors with clean IPI scores stack inventory for Q4.

This guide delivers the tactical steps, best practices, and tools you need to protect your storage capacity and profits under the new rules.

What is the Amazon Inventory Performance Index and why does it matter?

Amazon’s Inventory Performance Index update means your storage capacity and costs are now tied more tightly to your score than ever before.

The IPI is a numerical score (0-1,000) that measures how efficiently you manage FBA inventory. It directly determines how much stock you can store, what fees you pay, and whether you face restock restrictions.

Amazon calculates IPI using four core drivers:

Table 1: Amazon Inventory Performance Index metrics

In 2026, the minimum IPI threshold to avoid storage restrictions remains at 400, but the consequences for falling below are more severe.

The storage window shortens from six to five months of forecasted sales, and long-term storage fees now apply at 271 days instead of 365.

Tracking IPI in real time now requires accurate, up-to-date Amazon inventory data across all channels. Let us break down exactly what is changing and how it will affect your daily operations.

Suggested read: Amazon Inventory Forecasting: When to Upgrade for Scale

The Amazon Inventory Performance Index policy changes: What’s new and how will it impact your business?

The IPI changes introduce stricter thresholds and faster penalties. Sellers must adapt inventory planning immediately to avoid costly disruptions. Here are the four updates affecting your operations:

• Storage capacity reduced from six to five months: Amazon now limits FBA storage to five months of forecasted sales, down from six. This means less buffer for seasonal inventory, tighter promotional windows, and a higher risk of stockouts on best sellers
• ASIN-level restock limits reinstated: Amazon has reintroduced product-level restock caps. Even if you have available FBA space, specific ASINs may hit their own limits, blocking shipments of your top sellers
• Performance-based allocation rewards efficiency: Your storage capacity now fluctuates based on operational efficiency. High IPI scores (above 450) may earn bonus capacity, while slow-moving inventory or poor sell-through rates can trigger further restrictions
• Long-term storage fees apply at 271 days: Units now incur long-term storage fees after 271 days; three months earlier than before. This accelerates costs on slow-moving stock and leaves less time to liquidate seasonal overstock

Sellers juggling multiple SKUs or channels now need unified inventory visibility to avoid accidental overstocking.

With these new rules, traditional inventory management approaches are no longer enough.

Why traditional inventory management breaks under the new IPI rules

Manual and reactive inventory management cannot keep up with Amazon’s faster, stricter IPI enforcement. The old way creates three critical failures:

• Data lags prevent timely corrections
• Spreadsheet errors compound across channels
• Weekly audits miss Amazon’s new five-day violation windows

A slow-moving SKU can now trigger penalties in days, not months.

By the time you spot an issue in a monthly review, Amazon may have already deducted IPI points, reduced your capacity, and blocked new shipments.

As your catalog grows, the time required to audit and optimize each product increases exponentially.

Without real-time dashboards and automated alerts, sellers risk missed excess inventory, delayed removals, and accidental overstocking.

Automated inventory management platforms now flag slow-moving SKUs before they impact your IPI. Here is the step-by-step process top sellers are using to adapt.

Step-by-step: How to adapt your inventory strategy

Adapting to Amazon Inventory Performance Index rules is a process. Follow these steps to protect your storage capacity and avoid new penalties.

Step 1: Audit current inventory and IPI score

• Log into Seller Central and review your IPI score and its four components
• Pull your aged inventory report to identify SKUs nearing the 271-day threshold
• Run the Stranded Inventory report to find units with listing errors or no active offers
• Calculate days of supply for each SKU: average daily inventory units divided by average daily units sold over the last 30 days

Suggested read: Amazon Inventory Financing Options & Readiness Guide

Step 2: Forecast demand for the new five-month window

• Analyze sales data from the past two to three years, broken down by month and category
• Identify seasonal patterns and planned promotions
• Use Amazon’s demand forecasting tool or an inventory management platform to project five-month demand

Step 3: Tighten restock and removal cycles

• Shift to shorter, more frequent restock cycles; order one month of inventory at a time when possible
• For SKUs with low supply, increase order frequency or explore local sourcing for faster replenishment
• Begin removal orders for SKUs approaching 120 days of supply or the 271-day fee threshold

Step 4: Monitor aged and excess inventory more frequently

• Replace monthly audits with weekly reviews of aged inventory, stranded units, and days of supply
• Set up automated alerts for SKUs dropping below 30 days or exceeding 90 days of supply
• For products in the 180-270 day range, compare storage fees to projected profit and remove if fees outweigh returns

Step 5: Use Amazon and third-party tools for real-time IPI tracking

• Access the Inventory Performance Dashboard in Seller Central weekly to monitor your score and limiting factors
• Use Webgility to automate weekly audits, consolidate data across channels, and receive real-time alerts for at-risk SKUs

Once you have the basics in place, here are the best practices top sellers use to stay ahead.

Suggested read: Optimize Amazon Inventory Turnover for Better Profitability

Best practices for maximizing your Amazon Inventory Performance Index and storage capacity

Top sellers use advanced tactics and real-time visibility to maximize Amazon profits and storage.

Implement dynamic demand forecasting using advanced analytics

• Use AI-powered forecasting tools that integrate sales data, marketplace trends, and seasonality
• Update forecasts weekly or daily to spot demand shifts and adjust restock decisions immediately

Integrate margin analysis with IPI optimization

• Calculate true margin by SKU, factoring in product cost, fees, storage, and shipping
• Make rational decisions about removing unprofitable SKUs or reducing stock to maintain IPI and profitability

Create a real-time inventory visibility dashboard

• Use centralized dashboards to track inventory levels, aging, sell-through rates, and storage utilization
• Update dashboards daily or weekly for instant visibility into at-risk SKUs

Establish weekly inventory review cadence with clear decision rules

• Hold weekly reviews to assess SKUs with excess supply, low sell-through, or aging inventory
• Apply preset rules: for example, remove any SKU with more than 130 days of supply and a negative sales trend within seven days

Implement real-time inventory visibility and automated monitoring systems

• Sync inventory across Amazon, Shopify, and other channels in real time
• Set up automated alerts for excess or slow-moving inventory before it impacts your IPI

Let us see how these best practices look in action with the right operational tool.

Suggested read: Boost Your Amazon Profits With Cost Tracking

How Webgility helps master Amazon Inventory Performance Index

Webgility equips sellers advanced tools and analytics to thrive under the new Amazon Inventory Performance Index changes. Key features include:

• Real-time inventory sync: Webgility connects Amazon, Shopify, and other channels, updating inventory instantly across platforms to prevent overselling or accidental overstocking
• Automated alerts: Receive notifications for excess or slow-moving inventory, so you can act before IPI drops or fees accrue
• Centralized dashboard: Monitor IPI drivers (sell-through, aged stock, storage limits) in one place, with actionable insights for every SKU
• Seamless QuickBooks integration: Track fees, costs, and true margins by SKU for accurate accounting and smarter decisions

Different Roads to Learning, a growing ecommerce retailer, struggled with manual inventory and accounting updates across sales channels.

With Webgility automating order sync, inventory updates, and QuickBooks posting, the team gained real-time visibility into inventory and fees.

This helped reduce stock discrepancies and supported healthier sell-through and inventory accuracy, which are key drivers of Amazon’s Inventory Performance Index.

Schedule a demo with Webgility today.

Frequently asked questions (FAQs)

How is the Amazon IPI score calculated?

Amazon calculates IPI using excess inventory percentage, sell-through rate, stranded inventory percentage, and in-stock rate. These metrics reflect how efficiently you manage FBA inventory.

What happens if my IPI drops below 400?

If your IPI falls below 400, Amazon imposes storage limits and may block new FBA shipments, especially during peak seasons. You may also face higher storage fees and removal surcharges.

How often does Amazon update my IPI score?

Amazon updates IPI scores weekly, so restrictions and penalties can change quickly based on your latest performance.