Amazon IPI Score 2026: How to Improve It and Why It Matters
The Amazon IPI (Inventory Performance Index) score is a 0-1,000 metric measuring how efficiently a third-party FBA seller manages inventory, based on excess inventory percentage, sell-through rate, stranded inventory percentage, and in-stock rate. The minimum threshold to avoid the storage penalty tier is 400. Amazon updates the score weekly and sets your actual monthly storage capacity — in cubic feet — through Capacity Manager, announced around the third Monday of each month with estimates for two months ahead. Even sellers with 550+ scores experienced significant capacity cuts during Amazon's May 2025 network-wide reduction, proving a good score alone doesn't fully protect against warehouse-wide capacity constraints.
Key Takeaways
- Your Amazon IPI score is a 0-1,000 number Amazon assigns to your seller account based on four factors: excess inventory percentage, FBA sell-through rate, stranded inventory percentage, and in-stock rate for replenishable ASINs.
- The minimum threshold to avoid FBA storage limits is 400 in 2026. Scores of 500+ are considered healthy, and 550+ is generally regarded as strong, sustained inventory management.
- The contrarian insight most guides don't mention: a good IPI score is not full protection. During Amazon's May 2025 network-wide capacity reduction, sellers with IPI scores above 550 still experienced significant capacity cuts — Amazon's own warehouse constraints can override individual seller performance.
- Amazon tightened FBA capacity further in mid-2025, reducing storage allowances from six months of forecasted sales down to five months, while also reactivating ASIN-level restock limits on top of account-wide caps — meaning even compliant sellers have less structural buffer than in previous years.
- Amazon's Capacity Manager lets sellers bid for additional storage capacity for roughly $0.15 per cubic foot of extra space used — a fee that's largely rebated for sellers with reasonable sell-through, and a lever most IPI guides never mention alongside score-improvement tactics.
- IPI is a lagging indicator calculated over a rolling window, not a real-time score. Actions you take today typically take 2-4 weeks to fully register, and recovery from a sub-350 score can take 12-16 weeks of sustained effort.
- Three of the four IPI factors are heavily influenced by your pricing strategy — items priced above the Buy Box don't sell, which drags sell-through, inflates excess inventory percentage, and can even trigger pricing-related listing suspensions that create stranded inventory.
- What Is the Amazon IPI Score and Why Does It Exist?
- What Are the 4 Factors That Determine Your IPI Score?
- What Is a Good Amazon IPI Score in 2026?
- What Happens When Your IPI Score Drops Below 400?
- How Do You Improve a Low Amazon IPI Score?
- How Long Does It Take to Recover a Low IPI Score?
- How Often Does Amazon Evaluate Your IPI Score?
- Should You Manage IPI Yourself or Get Professional Help?
- Frequently Asked Questions
Your Amazon IPI score is a number between 0 and 1,000 that determines how much inventory Amazon allows you to store in its FBA fulfillment centers — drop below the minimum threshold, and Amazon caps your storage capacity; drop further, and you may not be able to send in new shipments at all. For sellers running real volume through FBA, the Amazon IPI score isn't a vanity dashboard metric — it's a direct constraint on how much you can grow, especially heading into peak season.
This guide explains exactly what the IPI score measures, the current 2026 thresholds, the specific actions that move your score fastest, and — critically — the parts of this system most guides skip entirely: a 2026 capacity change that reduced sellers' structural buffer regardless of score, a bidding mechanism that lets you pay for extra space instead of just chasing the score, and real evidence that even a strong IPI score doesn't fully insulate you from Amazon's own warehouse capacity constraints.
What Is the Amazon IPI Score and Why Does It Exist?
The Amazon Inventory Performance Index (IPI) is a composite 0-1,000 score Amazon assigns to third-party FBA sellers to measure how efficiently they manage inventory stored in Amazon's fulfillment network. Amazon introduced IPI in 2018 specifically to discourage two opposite problems at once: sellers who over-stock slow-moving inventory (tying up finite warehouse space) and sellers who under-stock fast-moving inventory (creating stockouts that hurt the customer experience).
You can find your current IPI score inside Seller Central under Inventory → Inventory Planning → Performance. The score updates weekly, though it reflects a rolling performance window rather than a single point-in-time snapshot, which is why actions you take today don't show up in your score immediately.
It's worth noting that IPI applies specifically to third-party sellers using Fulfillment by Amazon (3P/FBA) — Amazon does not apply this scoring system to 1P vendors selling directly to Amazon's retail arm, since Amazon itself controls inventory planning on the vendor side. If you're evaluating which selling model fits your business, that's one more operational difference worth factoring in alongside pricing and margin considerations.
Amazon's own fulfillment center capacity is genuinely finite, and IPI is the mechanism Amazon uses to allocate that limited shelf space fairly across millions of sellers. A high IPI score signals to Amazon that giving you more storage capacity is a good use of warehouse space — inventory that will sell and turn over quickly rather than sit idle. A low score signals the opposite, and Amazon responds by restricting how much you're allowed to store.
What Are the 4 Factors That Determine Your IPI Score?
Amazon calculates your IPI score from four factors: excess inventory percentage, FBA sell-through rate, stranded inventory percentage, and in-stock rate for replenishable ASINs — with excess inventory and sell-through rate carrying the heaviest combined weight, based on seller testing and Amazon's own documentation. Amazon does not publish the exact formula or precise weighting, but these four components are confirmed directly in Seller Central.
What Counts as Excess Inventory on Amazon?
Excess inventory is FBA stock that represents significantly more supply than Amazon's forecasting model expects you to sell within a set window — commonly benchmarked around 90+ days of supply for a given SKU. If a product averages 10 units sold per month and you're holding 100 units in FBA, a meaningful share of that stock is excess relative to actual sales velocity. Amazon calculates excess as units where the ongoing cost of storage outweighs the expected revenue from selling at your current pace, and this factor typically carries the heaviest weight in the overall score.
What Is FBA Sell-Through Rate and How Is It Calculated?
FBA sell-through rate is calculated as units sold and shipped over the trailing 90 days divided by your average FBA inventory during that same period. A sell-through rate below 1.0 means you're holding more inventory than you're actually moving. Industry benchmarks generally place a healthy sell-through rate somewhere between 3.0 and 7.0 depending on category, and this metric moves in tandem with excess inventory — improving one typically improves the other, since they're measuring closely related behavior from different angles. Sell-through is also the mechanism connecting inventory availability to Best Seller Rank: consistent sales velocity supports BSR, while lost sales from a stockout reduce sell-through and indirectly cost you ranking momentum on that ASIN.
What Is Stranded Inventory and Why Does It Hurt Your Score?
Stranded inventory is FBA stock physically sitting in a fulfillment center without an active, purchasable listing attached to it — meaning it earns zero revenue while still costing you storage fees every month. Common causes include a suspended listing due to a policy issue, an automated pricing error flag, a category gating change after the listing went live, or a removed product variant. Stranded inventory is generally the fastest-moving of the four IPI components to fix, since resolving it is often a same-day action inside Seller Central's Fix Stranded Inventory tool.
What Is FBA In-Stock Rate and Does It Directly Affect Your Score?
FBA in-stock rate measures the percentage of time your replenishable ASINs remained in stock over the trailing 30 days, but Amazon has confirmed this specific metric is informational rather than a direct scoring input — a stockout itself does not subtract points from your IPI score. This is one of the more common misconceptions sellers carry into their IPI recovery strategy. Amazon's own Seller Central guidance clarifies that a low in-stock rate doesn't lower your score directly; instead, it flags a missed sales opportunity, and the resulting lost sales are what indirectly drag down sell-through rate — a component that is directly scored. In-stock rate specifically excludes any SKU you've manually flagged as non-replenishable, which is why correctly flagging products you don't intend to restock matters for keeping this diagnostic metric accurate, even though it won't move your score on its own.
What Is a Good Amazon IPI Score in 2026?
A good Amazon IPI score in 2026 is 500 or above, with 550+ considered strong, sustained inventory management — the minimum threshold to avoid storage capacity limits is 400, and most active FBA accounts fall somewhere between 400 and 800.
| IPI Range | Zone | What It Means for Your Account |
|---|---|---|
| Below 350 | Critical | Severe capacity reduction, blocked inbound shipments possible |
| 350-400 | Penalty | Storage limits active, overage fees likely stacking |
| 400-500 | Maintenance | Clear of penalties, but one weak stretch away from falling back below |
| 500-550 | Healthy | Full standard FBA benefits, normal storage capacity |
| 550-800 | Strong | Comfortable buffer against seasonal swings and score volatility |
| 800+ | Best-in-class | Rare tier, typically lean and fast-turning catalogues only |
The 400 threshold is a floor, not a target. Operating right at 401 means a single rough month — a slow-selling new product launch, a supplier delay, an unexpected return spike — can push you back below the line. Most experienced sellers deliberately maintain a buffer in the 550-600+ range specifically to absorb that kind of normal seasonal noise without triggering a capacity cut.
A good IPI score is not full protection from capacity cuts — and most guides imply otherwise. During Amazon's network-wide capacity reduction in May 2025, sellers with IPI scores above 550 still experienced significant reductions in their FBA storage allocation, despite having done everything right on paper. This matters because it reveals something most "improve your score" content leaves out: your IPI score determines your relative position when Amazon allocates capacity, but it does not override Amazon's own fulfillment center capacity constraints at a network level. When Amazon's total warehouse space tightens system-wide, every seller absorbs some impact, regardless of individual performance. The practical takeaway isn't "don't bother improving your score" — a strong score still gets you meaningfully better treatment than a weak one in every capacity allocation event. The takeaway is that IPI optimization alone is not a complete risk-management strategy, and sellers who treat 550+ as a guarantee of unrestricted growth are working from an incomplete picture.
What Happens When Your IPI Score Drops Below 400?
When your IPI score falls below 400, your account moves into Amazon's storage penalty tier — triggering overage fees on inventory beyond your reduced cubic-foot allocation, and in more severe cases, blocked inbound shipments until you clear existing stock. It's worth being precise about what "above 400" actually buys you: it is not unlimited storage. Every seller, regardless of score, operates under a specific monthly capacity allocation measured in cubic feet, set through Amazon's Capacity Manager system and based on IPI, sales history, and account type. A score above 400 keeps you out of the penalty tier — avoiding overage fees and the harshest restrictions — but you're still working within a defined ceiling, not an open-ended allowance.
| Consequence | IPI 400+ | IPI Below 400 |
|---|---|---|
| Storage Capacity | Standard monthly cubic-foot allocation, no penalty | Reduced allocation (penalty tier) |
| Shipment Creation | Normal, within your monthly allocation | Blocked once reduced capacity is reached |
| Overage Fees | None | Charged on inventory exceeding your limit |
| Product Launches | Send inventory within normal allocation | May lack capacity for new SKUs |
| Peak Season Prep | Standard Q4 positioning within allocation | Restricted Q4 inventory positioning |
Beyond the direct storage cap, a low score creates compounding secondary costs. Aged inventory sitting past 271 days triggers surcharges on top of standard monthly storage fees, and inventory that crosses 365 days adds another layer of long-term storage penalties — meaning a single slow-moving unit can accumulate multiple stacked fees while also dragging down the score that's causing the underlying restriction in the first place.
In mid-2025, Amazon tightened FBA capacity further in a way that reduced every seller's structural buffer, independent of individual IPI performance. Amazon reduced standard storage allowances from six months of forecasted sales down to five months, and separately reactivated ASIN-level restock limits stacked on top of existing account-wide capacity caps. This means a seller can be fully compliant on their overall IPI score and still find a specific bestselling SKU capped at the individual product level — a restriction that exists independently of the account-wide number most sellers watch. The practical effect: even sellers who never dip below 400 have meaningfully less room to maneuver in 2026 than they did in prior years, since both the total allowance shrank and a second, SKU-specific constraint layer came back online. Checking only your overall IPI score without also reviewing ASIN-level restock limits inside Capacity Manager can leave a genuine capacity problem invisible until a specific bestseller hits its cap.
There's also a timing risk worth understanding clearly, even under the monthly system. Amazon announces your confirmed capacity limit for the upcoming month around the third Monday of the prior month, alongside rolling estimates for the two months after that — so a weak IPI trend heading into August and September directly shapes the capacity estimates you're working with for Q4. Because the score responds with a lag, a seller who lets inventory health slide over the summer can find their Q4 capacity estimate already constrained by the time October's confirmed limit arrives, with too little runway left to fix it before peak season. Watching the trend proactively through late summer, rather than reacting once a specific month's limit disappoints, is what protects your holiday positioning.
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How Do You Improve a Low Amazon IPI Score?
The fastest way to improve a low Amazon IPI score is resolving stranded inventory immediately, followed by clearing genuinely dead SKUs and reducing excess stock on slow movers — these three actions address the components that respond quickest to direct intervention, typically showing measurable score movement within 2-4 weeks.
Fix stranded inventory the same day you find it
Open Seller Central's Fix Stranded Inventory tool (Inventory → Manage Inventory → Stranded Inventory) and resolve every flagged listing within 48 hours. For each stranded unit, either relist the product correctly, match it to an existing active ASIN, or submit a removal order. Stranded inventory earns zero revenue while still costing storage fees, and it's generally the single fastest-moving lever on your IPI score, since it removes dead weight from the calculation almost immediately.
Remove genuinely dead SKUs via removal order
Sort your FBA inventory by units sold over the trailing 90 days. Any SKU with zero or near-zero movement is actively dragging your excess inventory percentage down. The removal fee (roughly $1.04-$1.53 per unit depending on size) is almost always cheaper than continuing to pay months of storage fees plus the ongoing IPI penalty from carrying it. Reviewing which SKUs genuinely deserve continued FBA space is easier with a structured framework — the guide on best products to sell on Amazon FBA covers the demand signals worth checking before deciding whether a slow SKU is worth keeping, discounting, or cutting.
Clear excess inventory with targeted promotions, not blanket markdowns
For ASINs flagged as excess, a Lightning Deal, a modest 10-20% price reduction, or bundling with a faster-moving product usually recovers more margin than an outright removal order while simultaneously improving sell-through rate. Avoid flooding your entire excess list with deep discounts at once — training Amazon's pricing algorithm and your customer base to expect permanently lower prices can suppress sell-through long after the original excess problem is resolved.
Reduce your average days-of-inventory to roughly 45 days
If your typical restock cycle targets 90 days of supply, you're structurally holding twice the inventory necessary to avoid a stockout. Tightening restock quantities toward a 45-day target improves excess inventory percentage and sell-through rate simultaneously, since both metrics respond to the same underlying change in how much stock you're carrying relative to actual velocity.
Use PPC to accelerate sell-through on slow-but-viable movers
For excess-flagged ASINs that still have genuine demand, a targeted Sponsored Products campaign can push daily sales velocity just enough to shift a SKU from "excess" back to "healthy" within 2-3 weeks. Track the advertising cost against the storage fee savings to confirm the campaign is actually worth running — the guide on Amazon PPC software covers the tools built specifically for this kind of targeted, ROI-tracked campaign management.
Flag non-replenishable SKUs correctly
Any product you don't intend to restock should be manually flagged as non-replenishable inside Seller Central — a two-minute setting change with a lasting benefit. In-stock rate only tracks replenishable ASINs, so a SKU you're intentionally winding down shouldn't count against that diagnostic metric once it naturally sells through. Many sellers never flip this setting, letting an intentional wind-down look like a stockout on their inventory dashboard — and since a genuinely stocked-out best-seller does eventually cost you sell-through (and therefore score) through lost sales, keeping the non-replenishable flag accurate helps you trust the dashboard enough to act on real problems instead of noise.
Fix your pricing discipline — the lever most guides underweight
Three of the four IPI components are downstream of pricing. An item priced above the Buy Box doesn't win sales, which drags sell-through rate, which inflates your excess inventory percentage — and an automated pricing error flag can suspend a listing outright, creating stranded inventory from the same root cause. Tools built specifically for Amazon repricing keep pricing competitive without manual monitoring, and consistent Buy Box positioning is one of the more overlooked ways to improve IPI without touching inventory levels at all.
Bid for extra capacity through Capacity Manager instead of only chasing the score
Amazon's Capacity Manager system lets sellers reserve additional storage capacity for a fee of roughly $0.15 per cubic foot of extra space used — a cost that's largely rebated back for sellers maintaining reasonable sell-through on the additional inventory. This is a parallel lever almost no IPI guide mentions alongside score-improvement tactics: rather than waiting weeks for score-driven capacity increases, you can bid for headroom directly when you need it, particularly useful heading into a product launch or peak season when timing matters more than the underlying score.
Improvements compound rather than working in isolation. Fixing stranded inventory also nudges excess inventory percentage down. Reducing DOI improves both excess and sell-through simultaneously. This is why the fastest recoveries tend to start with the highest-impact, fastest-moving fixes (stranded inventory, dead SKU removal) before shifting toward slower, structural changes (DOI targets, pricing discipline) that sustain the improvement over time.
How Long Does It Take to Recover a Low IPI Score?
Recovery time depends heavily on your starting score — a seller starting below 300 typically needs 12-16 weeks of sustained effort to clear penalty territory, while a seller starting in the 400-500 range can often reach a healthy score in 2-4 weeks. IPI is a lagging indicator built on a rolling performance window, not a real-time number, which is why even correct actions taken today won't fully register for several weeks.
| Starting Score | Estimated Recovery Time | Primary Focus |
|---|---|---|
| Below 300 | 12-16 weeks | Aggressive removal orders, heavy markdowns, full stranded cleanup |
| 300-400 | 6-10 weeks | Stranded inventory and aged stock first, then pricing and restock timing |
| 400-500 | 2-4 weeks | Tighten restock discipline and pricing consistency |
| 500+ | Ongoing maintenance | Weekly monitoring routine to sustain the score |
Most of the visible recovery tends to happen in the final stretch of any given recovery window rather than evenly across the whole period — early weeks often feel deceptively slow because stranded-inventory fixes and removal orders take time to fully clear and reflect in the rolling calculation, even though the underlying corrective action happened immediately.
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How Often Does Amazon Evaluate Your IPI Score?
Your IPI score itself updates weekly in Seller Central, but your actual FBA storage capacity is set monthly through Amazon's Capacity Manager system — Amazon announces your confirmed cubic-foot limit for the upcoming month around the third Monday of the prior month, alongside rolling estimates for the two months after that. This monthly cadence replaced Amazon's older quarterly storage-limit system, and it's a genuinely important distinction: your capacity isn't locked in for an entire quarter based on one evaluation window — it's recalculated every month, giving you a rolling three-month view rather than a single quarterly cliff.
| What Updates | Frequency | Where to Check |
|---|---|---|
| IPI score | Weekly | Inventory → Inventory Planning → Performance |
| Confirmed capacity limit (next month) | Monthly, ~3rd Monday | Capacity Monitor (bottom of Inventory Performance dashboard) |
| Estimated capacity (2 months out) | Monthly, same announcement | Capacity Monitor |
The practical implication is that IPI management is an ongoing, rolling discipline rather than a quarterly sprint before a single evaluation date. Because your score responds to a lagging window and each month's capacity limit builds on recent performance, a sustained dip heading into August and September shows up in your confirmed October, November, and December estimates well before the peak season inventory push actually needs to happen — which is exactly why monitoring the trend continuously, rather than reacting to one month's number, protects your holiday positioning better than waiting for a quarterly checkpoint ever did.
Should You Manage IPI Yourself or Get Professional Help?
Managing IPI yourself is realistic if you can commit to a consistent weekly review — checking your Inventory Performance Dashboard, Manage Inventory Health report, and Capacity Manager status in a focused 20-30 minute session — but the ongoing discipline this requires is exactly where many otherwise capable sellers fall behind once their catalogue grows past a manageable size.
IPI management isn't a one-time fix — it's a recurring operational habit that touches restock timing, pricing discipline, listing health, and promotional strategy simultaneously. Sellers running a small, focused catalogue can often maintain this manually without much friction. Sellers managing dozens of SKUs across multiple categories, or those running a structured product research process to continually test new items, frequently find that consistent IPI monitoring is the first operational task that slips once other priorities compete for attention.
This is precisely the kind of ongoing operational discipline a managed Amazon service is built to handle — restock timing, excess inventory cleanup, and pricing consistency are the same inputs a done-for-you team tracks continuously as part of running the store, rather than a separate task competing with product research, advertising, and customer service for a seller's limited weekly time.
Frequently Asked Questions About Amazon IPI Score
IPI Is a System to Manage, Not a Single Number to Chase
Your Amazon IPI score is a genuinely useful signal — it rewards exactly the behavior that keeps an FBA business healthy: fast-turning inventory, minimal dead stock, and consistent availability on your best sellers. The four factors behind it aren't arbitrary, and improving them tends to improve your actual business economics alongside the number itself.
What most guides leave out is the fuller picture: a strong score is not a guarantee against Amazon's own warehouse-wide capacity constraints, the 2026 reduction in storage allowances means every seller has less structural buffer than before regardless of score, and Capacity Manager's bidding option gives you a second lever beyond pure score improvement when you need space on a tighter timeline. Treating IPI as one input into a broader inventory strategy — rather than the entire strategy — is what separates sellers who stay ahead of capacity restrictions from those who scramble every time a notification appears.
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Amelia Johnson
Amelia Johnson is an E-Commerce Writer at TechEcomm with over 8 years of experience, working since 2018. She creates high-performing online content for small businesses and large enterprises across platforms like Amazon, Walmart, eBay, and Shopify. Amelia blends SEO strategy, marketplace expertise, and compelling storytelling to help brands grow, convert, and compete in fast-paced digital marketplaces.
Amelia Johnson
Amelia Johnson is an E-Commerce Writer at TechEcomm with over 8 years of experience, working since 2018. She creates high-performing online content for small businesses and large enterprises across platforms like Amazon, Walmart, eBay, and Shopify. Amelia blends SEO strategy, marketplace expertise, and compelling storytelling to help brands grow, convert, and compete in fast-paced digital marketplaces.
