The Fee Now Looks at Each Variation Separately
The low-inventory-level fee has been part of FBA since April 2024, and most sellers filed it away as “the penalty for running out of stock.” The 2026 version deserves a second look, because as reported, a set of structural changes took effect on January 15, 2026 and one of them quietly changes who gets charged.
The headline change: the fee is now reported to be calculated at the seller-FNSKU level rather than the parent-ASIN level. Under the old arrangement, a parent listing with healthy overall coverage could mask an individual variation running thin. Under the new one, each of your own FNSKUs is assessed on its own days of supply — so a single starved size or colour can be charged while the parent looks perfectly well stocked.
"Averages hide starvation. The moment Amazon stopped averaging across the parent, every variation in your catalogue became its own restocking decision — and Q4 is the worst possible quarter to learn that."
— Tom Reiter, Product Research & Operations Specialist
The timing matters more than the mechanic. The fee is reported to be assessed when both your long-term (past 90 days) and short-term (past 30 days) historical days of supply sit below 28 days. That is a lookback window, which means the restocking decisions you are making right now, in late August, are the ones that determine whether a variation trips the threshold during the Q4 run-up.
What Changed in the 2026 Version
Here is the shape of the 2026 low-inventory-level fee as reported across industry coverage this year. Rates and thresholds are Amazon's to set and revise — check the current fee schedule and your own fee preview reports in Seller Central before you plan around any figure here.
| Element | Reported 2026 treatment | Why it matters |
|---|---|---|
| Calculation level | Seller-FNSKU, not parent ASIN | Each variation stands alone |
| Trigger | Both 90-day and 30-day historical days of supply below 28 days | A lookback, not a snapshot |
| Newly in scope | Small Bulky and Large Bulky products | Bulky sellers were not exposed before |
| Newly exempt | Grocery products | One category came out of scope |
| Reported rate range | $0.32 to $2.09 per unit | Varies by size, weight, shortfall |
As reported in 2026, with the structural changes described as effective January 15, 2026. Several exemptions have also been reported, including new professional sellers during an initial period, new-to-FBA products enrolled in the FBA New Selection Program during their early window, SKUs replenished predominantly through Amazon Warehousing and Distribution, and products selling under a low weekly unit threshold. Exemption terms, rate ranges, and day thresholds are set by Amazon and can change — confirm the current schedule and your own exemption status in Seller Central rather than relying on this summary.
How to Restock for Q4 Without Tripping It
The fee is avoidable, and the way you avoid it is unglamorous: plan at the variation level, and plan earlier than feels necessary. Five steps.
Your Variation-Level Restock Checklist
Pull days of supply by FNSKU, not by parent
Export your inventory report and calculate coverage for every child variation separately. The parent-level view that felt sufficient last year is exactly the view that now hides the SKU about to be charged.
Find your slow-moving variations before Amazon does
In most catalogues the exposure sits in the odd sizes and unpopular colours, where velocity is low enough that a small order looks like plenty until a promotion clears it in a week. Those are the SKUs to check first.
Model Q4 velocity, not trailing velocity
A 28-day threshold measured against a Q4 sales rate needs far more units than the same threshold measured against a quiet August. Forecast with the demand you expect in November, then order to that number.
Weigh the fee against storage, don't just avoid it
Overshooting to dodge a per-unit fee can cost more in Q4 storage and, later, in aged-inventory surcharges. Compare the reported low-inventory rate for your size tier against what the extra units cost to store through to spring before you inflate an order.
Check whether an exemption already covers you
Several exemptions have been reported, including newer professional seller accounts, products in their FBA New Selection window, replenishment through Amazon Warehousing and Distribution, and low weekly unit volumes. Confirm your own status in Seller Central before restructuring a purchase order you may not need to change.
Step four is where sellers lose money quietly. A fee reported in the range of roughly thirty cents to a couple of dollars per unit is real, but it is not automatically worse than carrying hundreds of surplus units through peak storage rates and into an aged-inventory surcharge next year. Do the arithmetic per SKU rather than adopting a blanket rule.
On our sourcing: This article summarises the 2026 low-inventory-level fee as reported in 2026 by Seller Snap, SellerApp, AMZ Prep, and Aura, describing structural changes effective January 15, 2026: calculation at the seller-FNSKU level rather than the parent-ASIN level, Small Bulky and Large Bulky products entering scope, Grocery products becoming exempt, a reported rate range of $0.32 to $2.09 per unit, and a trigger when both the 90-day and 30-day historical days of supply fall below 28 days. Reported exemptions include newer professional seller accounts, new-to-FBA products in their FBA New Selection window, replenishment predominantly through Amazon Warehousing and Distribution, and products below a low weekly unit threshold. Amazon sets and revises all fee rates, thresholds, and exemptions, and figures can differ by marketplace and product. Confirm the current fee schedule, your exemption status, and your own fee preview reports in Seller Central before making purchasing decisions. This is general information, not financial advice.
About the Author: Tom Reiter
Tom is AMZToolHub's Product Research & Operations Specialist. He has been launching Amazon products since 2015 and has analyzed 200+ product opportunities across product research, inventory management, profit analytics, and competitive strategy.