Amazon Storage and Low-Inventory Fees Explained (2026)

By Gulfam Haidar, Founder, GrowEventure. Last updated September 2026.

Amazon Low Inventory Fee: quick summary

In short, this guide covers amazon low inventory fee in plain terms. Below you will find the key points on amazon low inventory fee, a breakdown you can act on today, and clear answers to the most common questions about amazon low inventory fee.

Amazon’s low-inventory-level fee is charged per FNSKU when your available FBA stock for a product drops below a set number of days of supply. It sits alongside monthly storage fees and an aged-inventory surcharge on stock held over 180 days. The surprising part is that you can be charged for holding too little stock, not just too much. Avoid the low-inventory fee by keeping healthy days of supply and replenishing before you run low. Verify the current threshold and fee amounts in Seller Central, since they change.

This guide explains the counter-intuitive part clearly and shows you how to sit in the safe range between too little and too much.

The three inventory fees you can face

Amazon charges three separate fees tied to how you manage FBA stock. They are easy to confuse, so here is the plain version.

Monthly storage fee is rent for the space your inventory occupies in Amazon’s warehouses. You pay it every month, and it rises during the Q4 peak.

Low-inventory-level fee is a per-unit charge when your stock for a product runs too thin relative to how fast it sells. It penalizes running lean.

Aged-inventory surcharge applies to units that sit past 180 days. It stacks on top of the monthly storage fee and grows as stock ages. It is the penalty for stock that came in but never sold, and it is the one that quietly turns a slow product into a losing one.

The trap is that two of these push in opposite directions. Hold too little and you hit the low-inventory fee. Hold too much and you hit storage plus the aged surcharge. Your job is to sit in the middle.

The low-inventory-level fee (now per FNSKU)

The low-inventory-level fee triggers when your available FBA stock for a product falls below a set number of days of supply. Days of supply means how many days your current stock will last at your recent sales pace. Run low on days of supply and the fee applies.

The 2026 change is that it is charged per FNSKU. An FNSKU is the unique code Amazon gives each product in FBA. Charging per FNSKU means every product that runs thin can trigger its own fee. A seller with many SKUs can rack up several charges at once if multiple products dip low together.

Because of this, you cannot just protect your top sellers. Every active SKU needs healthy days of supply. See the 2026 fee context in our Amazon FBA fee changes 2026 guide.

Days of supply is calculated from your recent sales pace, so it moves as demand moves. A product selling five units a day needs far more units in stock to hit the same days-of-supply figure than one selling one unit a day. This means a sudden sales spike can shorten your days of supply fast, even if your unit count did not change. When a product takes off, your reorder clock speeds up with it. Sellers who do not watch this can get pulled below the threshold by their own success.

Why Amazon charges you for too little stock

This feels backwards, so here is the logic. Amazon’s fulfillment network is most efficient when products stay reliably in stock at healthy levels. Thin stock causes problems: frequent tiny inbound shipments, split orders, and stockouts that waste warehouse handling and disappoint Prime buyers.

By charging a fee on chronically low stock, Amazon nudges sellers to keep steady, well-planned inventory rather than trickling in a few units at a time. From Amazon’s side, predictable stock means smoother fulfillment and faster delivery promises. The fee is the stick that encourages that behavior.

Whether you agree with it or not, the practical answer is the same: keep enough days of supply and the fee never fires. The fee also nudges sellers away from a risky habit: running stock to near zero to dodge storage costs. That tactic backfires under the low-inventory fee, because the savings on storage are wiped out by the new charge on thin stock. Amazon has effectively closed the loophole of holding almost nothing, so the only reliable path is steady, well-forecast inventory.

Monthly storage fees

Monthly storage fees are based on the volume your inventory takes up, measured in cubic feet, and they differ by size class. Standard-size items pay one rate; oversize items pay a higher one because they eat more space.

The rate is not flat across the year. During the Q4 peak season, Amazon raises monthly storage rates because warehouse space is tight and demand is high. So the same pallet of stock costs more to store in October through December than in spring. Plan holiday inventory with the peak rate in mind, and avoid parking slow stock in FBA through Q4.

The oversize gap is larger than most sellers expect. Because storage is charged by the volume your stock occupies, a bulky item can cost several times more per unit to store than a small one, and the peak-season increase multiplies that gap. If you sell large items, the storage math alone can be a reason to keep less in FBA and lean on FBM or a 3PL for the slow months. Compare the two paths in our FBA vs FBM guide before you commit a full year of bulky stock to Amazon’s warehouses.

The aged-inventory surcharge (180+ days)

The aged-inventory surcharge applies to units that have sat in FBA for more than 180 days. It is charged on top of the monthly storage fee, and it climbs as the stock gets older. Very old stock can cost more to store than it is worth.

The trigger is slow sell-through. If units are not selling, they age, and the surcharge grows. The fix is to act before the 180-day mark: discount slow movers, bundle them with faster sellers, or create a removal order to pull them out. A healthy Inventory Performance Index reflects the same discipline; see our Amazon IPI score guide.

How to avoid the low-inventory fee

Staying clear of the low-inventory fee comes down to days of supply. Keep every active product above the threshold and it never triggers.

• Maintain healthy days of supply. Know your recent sales pace and hold enough stock to cover your reorder lead time plus a safety buffer.
• Forecast demand. Use recent sell-through and seasonality to predict how fast stock will move, then reorder in time.
• Shorten replenishment cycles. Faster, more regular restocks keep days of supply steady without over-ordering.
• Set restock alerts. Do not rely on memory. Let Seller Central or a tool warn you before a SKU dips low.

Our Amazon inventory management guide covers forecasting and replenishment in more detail.

(Title: “Too Little or Too Much: The Inventory Fee Sweet Spot.”)

How to avoid storage and aged surcharges

The other side of the balance is not holding too much. To dodge storage fees and the aged surcharge:

• Clear slow stock early. Run promotions on units before they near 180 days.
• Use removal orders. Pull out stock that will not sell rather than paying a rising surcharge to store it.
• Right-size shipments. Send in what your sales pace supports, not a year of stock at once.
• Watch Q4. Avoid leaving slow inventory in FBA through the peak storage-rate months.

If units were lost or damaged in the FBA network while stored, you may be owed a refund. See Amazon FBA reimbursement.

Balancing both fees

The sweet spot is the range between too little and too much. Too little stock triggers the low-inventory fee. Too much triggers storage fees and the aged surcharge. Healthy days of supply, matched to real demand, keeps you clear of both.

Think of it as a target band, not a single number. For a fast seller, that band might be a few weeks of cover. For a slow seller, less. The skill is matching stock to sales pace and adjusting as demand shifts. Get it right and you pay only the base fees you cannot avoid.

A practical way to find your band is to work backward from your reorder lead time. If a new batch takes eight weeks to arrive from order to receipt, you need enough stock to cover those eight weeks plus a safety buffer, and enough on top to stay above the low-inventory threshold. That total is your floor. Your ceiling is the point where extra units would age past the storage and surcharge lines before they sell. The gap between the two is your safe band. Products with short lead times and fast sales get a wide band and are easy to manage. Products with long lead times and slow sales get a narrow band and demand tighter planning, which is exactly where a forecasting routine or a dedicated manager earns its keep.

The counter-intuitive lesson bears repeating, because it is the one sellers miss: Amazon can charge you for holding too little, not only too much. Most people arrive at these fees assuming the only sin is overstocking. Then a low-inventory fee lands on a product they deliberately kept lean, and it makes no sense until they understand the days-of-supply trigger. Once you know both ends of the band exist, the whole system clicks. You stop swinging between panic-buying and cutting stock to the bone, and you start aiming for the steady middle where neither fee fires. That steadiness is worth real money over a year, and it is entirely within your control once you plan around the trigger instead of reacting to the bill.

If juggling this across many SKUs is more than you want to manage, our Amazon account management team handles forecasting, replenishment, and fee control for brands. Start with a free audit. For the full cost picture, see Amazon seller fees.

Comparison table

Amazon Inventory Fees Compared (2026)

Fee	Triggered by	Basis	How to avoid
Monthly storage fee	Space your stock occupies	Per cubic foot, higher in Q4	Right-size stock; avoid slow inventory in peak
Low-inventory-level fee	Stock below set days of supply	Per FNSKU, per unit	Keep healthy days of supply; replenish early
Aged-inventory surcharge	Units held over 180 days	Rises with age	Clear or remove slow stock before 180 days

Frequently asked questions

What is the Amazon low inventory fee?

It is a per-unit fee charged per FNSKU when a product’s available FBA stock falls below a set number of days of supply. It penalizes running too lean.

Why am I being charged a low inventory fee?

Your stock for that product dropped below the days-of-supply threshold Amazon uses. Because the fee is now per FNSKU, each low-stock product can trigger its own charge.

How do I avoid the low-inventory-level fee?

Keep healthy days of supply on every active SKU, forecast demand, and replenish before stock runs thin. Restock alerts help you act in time.

How much are Amazon storage fees in 2026?

Monthly storage fees are charged per cubic foot and vary by size class, with higher rates during the Q4 peak. Confirm the current rate for your size tier in Seller Central.

What is the aged-inventory surcharge?

It is an extra fee on units held in FBA past 180 days, charged on top of monthly storage and rising as the stock ages.

How many days of supply should I keep?

Enough to cover your reorder lead time plus a safety buffer, matched to your recent sales pace. Confirm the current low-inventory threshold in Seller Central so you stay above it.

Sources: Amazon Seller Central low-inventory-level fee help page; Amazon FBA storage fee schedule; Amazon aged-inventory surcharge documentation; Amazon 2026 fee announcements.