Overview

Amazon provides sellers with an incremental inventory file system that allows you to update, add, or remove product listings without re-uploading your entire catalog each time. Understanding how this process works is essential for Professional sellers who manage large catalogs and need to make frequent changes to pricing, quantities, or product details.

Key Points / What Sellers Need to Know

• Professional plan required — Inventory file uploads are only available to sellers on Amazon's Professional selling plan. Individual sellers cannot use this feature.
• Incremental updates are supported — After your initial inventory file upload, you only need to include the specific SKUs you want to create, modify, or delete in subsequent uploads.
• No file upload limits — There is no cap on how many inventory files you can create and upload to Seller Central, giving you flexibility to make changes as often as needed.
• Data persists until changed — Product data you upload for a given SKU stays in Amazon's catalog until you explicitly upload a new file referencing that same SKU.
• Three core actions — Inventory files can be used to add new products, update existing listings, or delete products from your catalog.

How Incremental Uploads Work

Once you have built and uploaded your original inventory file, Amazon retains all of the product data you submitted. From that point forward, any new file you upload only needs to contain the SKUs you want to change. Amazon merges the new data with your existing catalog rather than replacing everything. This means if you have 500 SKUs but only need to update pricing on three of them, your upload file only needs those three rows. The remaining 497 SKUs remain untouched in the system with their current data intact.

Practical Example: How Your Catalog Evolves

Consider a scenario where a seller makes four separate inventory file uploads over time. In the first upload, they add SKU 001 at $45.00. In the second upload, they add SKU 002 at $39.00 and SKU 003 at $23.00 — SKU 001 remains at $45.00 without being included in this file. In the third upload, they set SKU 002's quantity to zero, effectively removing it from active listings. The catalog now contains only SKU 001 and SKU 003. In the fourth upload, they update the titles and pricing for SKU 001 (now $44.99) and SKU 003 (now $38.99). Each upload only touched the SKUs that needed changes, while everything else in the catalog stayed the same.