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Amazon's Low Inventory Level Fee has been quietly draining margins for FBA sellers since its rollout in April 2024. If you haven't already felt its impact, you're either managing inventory exceptionally well — or you're about to be surprised. This guide breaks down exactly how the fee works, who's exempt, and the practical strategies you can start using today to make sure it never hits your account.
Amazon introduced this fee as part of a broader push to improve fulfillment center efficiency. The core idea is straightforward: when sellers consistently run low on stock, it disrupts Amazon's ability to position inventory strategically across its warehouse network. That inefficiency costs Amazon money, and the Low Inventory Level Fee is how they pass some of that cost back to sellers. The metric at the center of this fee is called historical days of supply — a calculation that estimates how many days your current FBA stock would last at your existing sales pace. Amazon evaluates this across two rolling windows: a 30-day window and a 90-day window. Here's the critical detail most sellers miss: the fee only applies when both windows simultaneously fall below 28 days. If either your short-term or long-term supply is above that threshold, you're in the clear for that period. This dual-window structure means a single bad week won't automatically trigger the fee — but a sustained pattern of low stock absolutely will. The fee is charged per unit on every outbound shipment and varies by product size tier:
Small standard size: ~$0.89 per unit Large standard size: ~$0.97 per unit Small oversize: ~$1.11 per unit Medium oversize: ~$1.25 per unit Large oversize: ~$1.43 per unit
On a handful of units, these numbers seem trivial. But if you're moving 500 to 2,000 units a month on a product running low on stock, the math turns ugly fast. A large standard item at $0.97/unit across 1,000 shipments is nearly $1,000 gone in a single month — on top of your existing FBA fees.
Not all sellers or ASINs are subject to the Low Inventory Level Fee. Amazon has built in several exemptions worth knowing:
New ASINs under 180 days old are automatically exempt. This gives newer product listings time to build a sales history and establish a replenishment rhythm before the fee kicks in. Products with zero sales in the past 90 days are exempt, since there's no velocity to measure against. Active FBM (Fulfilled by Merchant) offers on the same ASIN may exempt those units from the fee. If you're fulfilling some orders yourself, Amazon recognizes that you're not entirely dependent on FBA stock levels. Seller Fulfilled Prime orders are similarly not subject to this fee.
If you think an exemption applies to your account but you're still being charged, that's a dispute worth raising more on that below.
The good news is that Amazon gives you the tools to track your exposure before the fee hits. The key is actually using them consistently. In Seller Central, navigate to Inventory > FBA Inventory. Here, each ASIN will display an estimated days of supply figure based on your recent sales velocity. For a more focused view, go to Inventory > Inventory Health, which specifically flags products at risk of the low inventory fee and shows which ASINs are trending toward the threshold. Make it a weekly habit to check these dashboards and filter for any ASINs sitting below 35 days of supply not 28. That extra 7-day buffer is your early warning system. By the time you're at 28 days, you may already be too late to replenish in time, especially if your supplier has a 2–3 week lead time. Set up restock alerts or calendar reminders for your top-selling SKUs so that low inventory never sneaks up on you during a busy stretch.
The simplest and most effective change is adjusting when you reorder. If you're currently setting alerts at 28 days, you're operating with zero margin for error. Shipping delays, customs holds, supplier backlogs, and demand spikes can all eat into that buffer instantly. Setting your personal reorder trigger at 35 days gives you a realistic safety window without dramatically increasing your capital commitment.
Amazon's built-in Restock Inventory tool, found inside Seller Central under Inventory > Restock Inventory, generates suggested order quantities based on your current sales velocity and supplier lead times. It's one of the most underused tools in the platform. Rather than guessing how much to order, let this tool generate a data-driven recommendation and then adjust it based on any upcoming promotions, seasonal trends, or supplier constraints you're aware of.
Many sellers ship inventory in large batches a few times a year to minimize freight costs. While this can make sense from a cost-per-unit perspective, it creates significant stock vulnerability in the weeks before a new shipment arrives. Splitting your orders into smaller, more frequent batches — monthly or every six weeks — keeps your days of supply more consistently above the threshold. Yes, per-unit freight costs may increase slightly, but that's often far less than what you'd lose to the Low Inventory Level Fee across hundreds of units.
A third-party logistics (3PL) provider can act as a buffer between your supplier and Amazon's fulfillment network. Instead of shipping directly from manufacturer to FBA, you hold a reserve of inventory at a 3PL. When your FBA days of supply starts trending toward 35 days, you can replenish quickly from the 3PL without waiting on a full international or domestic shipment from your supplier. This is especially valuable if your lead times are long or unpredictable.
Having an active FBM offer on your best-selling products serves two purposes. First, FBM orders don't trigger the Low Inventory Level Fee, so you have a fallback that won't cost you extra during a stock dip. Second, an FBM listing can help protect your Buy Box visibility during FBA stockouts, keeping sales momentum alive while your replenishment shipment is in transit. It requires a bit more operational overhead to manage self-fulfilled orders, but for high-volume ASINs, it's a worthwhile safety net.
If you believe the fee was incorrectly applied — for instance, on a new ASIN that was still within its 180-day exemption window — you can dispute the charge by opening a case with Seller Support in Seller Central. When submitting your dispute, include:
The specific ASIN in question The date(s) the fee was charged Documentation supporting your exemption (e.g., ASIN creation date, proof of FBM activity)
Be aware, though, that Amazon does not grant exemptions for supply chain disruptions, cash flow constraints, or general inventory mismanagement. The dispute process is specifically for cases where an exemption should have applied but didn't. If the fee was charged correctly, the most productive path forward is implementing better inventory controls so it doesn't happen again.
The Low Inventory Level Fee isn't going away, and Amazon is unlikely to soften it. It's a structural incentive designed to push sellers toward tighter, more consistent inventory management — which ultimately serves Amazon's fulfillment efficiency. The good news is that avoiding it isn't complicated. Check your days of supply weekly. Use the Restock Inventory tool to generate data-backed order quantities. Keep a 3PL buffer if your supplier lead times are long. Build FBM backup listings for your top sellers. And most importantly, treat 35 days of supply as your floor, not 28. Sellers who adopt this mindset stop thinking about the Low Inventory Level Fee entirely — because with the right systems in place, it simply never applies.
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