
IPI is Inventory Performance Index and it is a factor in determining how much Amazon will let you store in their warehouses.
The biggest factor in IPI is your Sell-Through Rate. To calculate this, take your sales per day and divide by your total in stock FBA inventory. Ideally, you want to be above 1% daily sell-through as a good best practice to keep moving inventory and have a good IPI. (Example: 100 sales per day with 10,000 items in stock in FBA = 1% daily sell-through).
On July 13, 2020, Amazon announced that the next IPI check will require 500 IPI for unlimited storage through the end of the year. This is much higher than in the past. The next checkpoint for IPI is August 16, 2020. If you are below 500 IPI at this point, you will receive restrictions on the amount of storage given to you in Amazon warehouses through the end of the year.
Currently, to see your Inventory Performance Index, on the Amazon Seller Central Dashboard go to the Inventory heading and then in the drop down menu, click on Inventory Planning.
Amazon lists some factors that can influence IPI but it all comes down to sell-through rate. For instance, if you removed all your stranded and unfulfillable inventory, it would reduce your total unsellable inventory in the warehouse and increase your sell-through rate since that inventory would no longer be calculated in your total inventory amount. Amazon will also list ASINs that can be restocked but that just shows an opportunity for you to increase sales. The fact that you have inventory that could be restocked does not directly impact your IPI but restocking those items could increase your IPI by increasing your sales. So, deleting the items you don’t plan to restock from your inventory will not directly increase your IPI (this is a common myth).
Tips to Increase IPI
- Repricers: Use a repricer to be competitive and move inventory. I recommend matching the Buy Box price as a general strategy. If no buy box exists, I usually match the lowest FBA offer (as long as it meets my minimum price I am willing to sell at) I personally use BQool as my Repricer. Aura and RepriceIt are two other popular options.
- Remove Stranded or unfulfillable Inventory: Sometimes you may no longer be able to sell items or they need to be returned, inspected, and sent back in. Make sure you are removing your stranded and unfulfillable inventory once a week at least to keep on top of it.
- Get Rid of Poor Inventory: Many times, an item will tank in price after you send it in. It is usually a best practice to cut your losses and move on by putting that cash into better inventory. If the item tanked so much you would lose money by selling the item, have Amazon dispose of it (or send it back to you).
- Ship in Fast Moving Inventory: Especially if you know you have a deadline to meet an IPI requirement, ship in some inventory you know you can sell through as soon as it hits the FBA warehouses. You might even be willing to accept lower profits in order to boost your IPI before a deadline hits.
- Note that deleting old ASINs from your inventory does NOT have an impact on your IPI. This is only shown as a factor because you could restock these items to continue selling them. Basically, Amazon is just showing you the opportunity to increase your IPI by restocking this inventory.
- Don’t go crazy over worrying about IPI. While we don’t know what Amazon’s plan is, they have said they will provide enough storage capacity for sellers even if they don’t hit this number. However, since we don’t know yet what they consider to be enough, I am trying my best to hit the IPI requirement each time a checkpoint comes up.

