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Key fact: Amazon FBA monthly storage fees run $0.78 per cubic foot for standard-size items off-peak and $2.40 during peak season (Q4).
Planning when to reorder? This page is the reorder-point planner — pricing of aged stock lives in a separate tool: 6-month inventory storage fee calculator & 2026 surcharge rates.
← ylishi.tools| SKU | Current Stock | Daily Sales | Lead Time (d) | Safety Stock | Reorder Point | LI Fee Risk | Status | Actions |
|---|---|---|---|---|---|---|---|---|
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📉 LI Fee Risk = forward days of supply (current stock ÷ avg daily sales) priced against the 2026 low-inventory fee card ($0.32–$2.09 per shipped unit, by size tier). Amazon's billable metric is historical and stricter: since January 15, 2026 days of supply is scored per FNSKU, and the fee fires only when both the trailing 30-day and 90-day windows sit below 28 days. Treat this column as an early warning, not the invoice — run the exact figure in the FBA fee calculator.
Amazon charges monthly storage fees for all inventory in FBA warehouses, typically $0.78–$2.40 per cubic foot depending on product size and time of year (higher Oct–Dec). Products stored longer than 181 days face additional long-term storage fees (LTSF) on the 15th of each month.
Key formula: Monthly Storage Fee = Unit Volume (cubic ft) × Rate per Cubic Ft. For standard-size items, 1 cubic foot stores roughly 15–20 small products. A SKU sitting unsold for 6 months can cost you $5–$15+ per unit in pure storage fees — often exceeding the product's margin.
Best practice: Keep inventory turnover at 8–12× per year (30–45 day supply). Use this calculator to set reorder points that balance stockout risk against storage costs.
The aged inventory surcharge starts at 181 days (about 6 months) and increases the longer a unit sits unsold. Effective January 16, 2026, Amazon also split the old single "366 days or more" band into two — 366–455 days and 456+ days:
| Days in storage | Aged inventory surcharge |
|---|---|
| 181–210 days | Surcharge starts — $0.50/cu ft, the lowest band |
| 211–240 days | $1.00/cu ft — surcharge doubles |
| 241–270 days | $1.50/cu ft — still low, but the next band is the cliff |
| 271–300 days | $5.45/cu ft — the cliff; a 263% jump from $1.50 |
| 301–330 days | $5.70/cu ft |
| 331–365 days | $5.90/cu ft |
| 366–455 days | $6.90/cu ft, or $0.30/unit, whichever is greater |
| 456+ days | $7.90/cu ft, or $0.35/unit, whichever is greater |
The surcharge is assessed on top of monthly storage around the 15th of each month. To avoid it: set reorder points with the optimizer above, run removal orders before day 181, or liquidate slow SKUs — a unit sitting 6 months can rack up $5–$15+ in storage alone.
The Amazon 6-month inventory storage fee (officially the "Aged Inventory Surcharge") is one of the most overlooked costs eating into FBA seller profits. If your inventory sits in an Amazon warehouse for more than 181 days, you'll start paying surcharges on top of your regular monthly storage fees — and the costs escalate quickly.
Need the exact per-unit number rather than the rate table below? The 6-month inventory storage fee calculator shows what a specific SKU will pay once it crosses the 181-day threshold, using the current 2026 rates.
| Age Bracket | Surcharge (per cu ft/month) | Example: 0.5 cu ft Product |
|---|---|---|
| 0 – 180 days | $0 (no surcharge) | $0 additional |
| 181 – 210 days | $0.50 | $0.25/month |
| 211 – 240 days | $1.00 | $0.50/month |
| 241 – 270 days | $1.50 | $0.75/month |
| 271 – 300 days | $5.45 | $2.73/month |
| 301 – 330 days | $5.70 | $2.85/month |
| 331 – 365 days | $5.90 | $2.95/month |
| 366 – 455 days | $6.90 | $3.45/month |
| 456+ days | $7.90 | $3.95/month |
A standard-size product (0.5 cu ft) with a $12 selling price and 30% margin ($3.60 profit):
Want to run these numbers against your own product dimensions and price? See the full breakdown of the Amazon 6 month inventory storage fee — including every age bracket, the assessment date, and worked examples by product size.
Pro tip: The 15th of each month is the assessment date. If you submit a removal order on the 14th, the item may still be charged — plan at least 3-5 days ahead. Use the optimizer above to set automatic reorder points and never let inventory age past 150 days. A profit dashboard with an inventory planner — SellerBoard from $19/month — watches stock levels and fee changes for you; we compare it against Helium 10 in our SellerBoard vs Helium 10 breakdown.
See how the 181-day aged inventory surcharge stacks up — and how to avoid it.
Amazon charges monthly inventory storage fees for all units in FBA warehouses. Units that stay longer than 181 days (6 months) incur additional long-term storage fees (LTSF). As of 2026, LTSF is charged per cubic foot or per unit (whichever is greater) on the 15th of each month. Fees vary by product size tier.
Enter each SKU with its current stock, unit cost, average daily sales, and supplier lead time. The tool automatically calculates: (1) monthly storage fee based on product dimensions, (2) long-term storage fee risk if stock exceeds 6-month supply, (3) safety stock level, and (4) optimal reorder point to avoid both stockouts and overstock.
A healthy FBA inventory turnover rate is 8-12 times per year (every 30-45 days). Products that turn slower than every 90 days are at risk of LTSF charges. Use this tool to monitor each SKU's days-of-supply and set reorder points that keep inventory moving.
Five strategies: (1) Use this tool to set optimal reorder points based on lead time and sales velocity. (2) Run Lightning Deals or coupons to clear slow-moving stock before the 15th of each month. (3) Remove excess inventory via FBA Remove Order. (4) Use FBA Inventory Age report to identify at-risk SKUs. (5) Consider multi-channel fulfillment for slow movers.
Safety stock is extra inventory held to prevent stockouts during supply delays. The formula used here: Safety Stock = Daily Sales × Lead Time × 0.5. For example, if you sell 10 units/day with a 14-day lead time, safety stock = 10 × 14 × 0.5 = 70 units. This buffer covers demand fluctuations and shipping delays.
Units stored longer than 181 days (6 months) incur aged inventory surcharges on top of regular monthly storage fees. In 2026 the surcharge runs from $0.50 to $7.90 per cubic foot depending on age band, and the steepest single step is at day 271. Amazon assesses it around the 15th of each month, so use the optimizer above to flag SKUs approaching 6 months of supply and clear them before the assessment date.
At 181 days (about 6 months) units start incurring the aged inventory surcharge on top of monthly storage - roughly $0.50-$7.90 per cubic foot depending on age band, assessed around the 15th of each month. A SKU sitting half a year can accumulate $5-$15+ in storage fees, often more than its margin. Track supply weeks in the optimizer above and clear or remove stock before day 181.
Keep 30-45 days of supply (8-12x annual turnover), set reorder points instead of over-ordering, discount or bundle slow movers before they hit 181 days, and use removal or liquidation orders for dead stock. The calculator above flags SKUs whose stock cover will cross the 6-month threshold.
The Amazon 6-month inventory storage fee (also called the aged inventory surcharge) applies to units stored in FBA warehouses for more than 181 days. In 2026, the surcharge ranges from $0.50 to $7.90 per cubic foot depending on how long inventory has been stored: 181-210 days ($0.50/cu ft), 211-240 days ($1.00/cu ft), 241-270 days ($1.50/cu ft), 271-300 days ($5.45/cu ft), 301-330 days ($5.70/cu ft), 331-365 days ($5.90/cu ft), 366-455 days ($6.90/cu ft or $0.30/unit), and 456+ days ($7.90/cu ft or $0.35/unit). This is charged on top of the standard monthly storage fee of $0.78-$2.40/cu ft. The surcharge is assessed around the 15th of each month.
After 6 months (181 days), Amazon charges an aged inventory surcharge of $0.50-$7.90 per cubic foot per month, in addition to the regular monthly storage fee of $0.78-$2.40/cu ft. For a standard-size product occupying 0.5 cubic feet, the surcharge is $0.25/month in the 181–210 day band and $2.73/month once the unit passes day 271 — meaning a $10 product sitting for 6 extra months could lose $27-$31 in fees alone. Use the calculator above to model your specific costs.
Amazon assesses the aged inventory surcharge (6-month storage fee) on the 15th of each month. Any unit that has been in an FBA warehouse for 181+ days as of that date will incur the surcharge. To avoid it, clear excess inventory before the 15th — run promotions, submit removal orders, or discount slow-moving SKUs. The cutoff resets monthly, so an item assessed on January 15th won't be assessed again on February 15th if it's still there (it will be charged again at the next age tier).
The monthly storage fee ($0.78-$2.40/cu ft) applies to ALL inventory in FBA warehouses, charged every month. The 6-month storage fee (aged inventory surcharge, $0.50-$7.90/cu ft) is an ADDITIONAL charge that kicks in after 181 days. So a product stored 6+ months pays BOTH fees. For example, a standard-size item at 0.5 cu ft pays ~$1.05/month normally, but after 6 months it pays $1.05 + $0.25 = $1.30/month in the opening band — and $1.05 + $2.73 = $3.78/month once the unit passes day 271.
In Seller Central, go to Inventory > Inventory Age. This report shows units by age bracket (0-90, 91-180, 181-270, 271-365, 365+ days). Any units in the 181+ brackets will be charged the aged inventory surcharge. You can also use the Inventory Health report for recommended actions. Our calculator above estimates when each SKU will cross the 181-day threshold based on current stock levels and sales velocity.
Amazon generally does not refund aged inventory surcharges. However, if you believe a fee was charged in error (e.g., the item was removed before the 15th), you can open a case with Seller Support. The best strategy is prevention: monitor the Inventory Age report weekly, set up fee alerts, and use the calculator above to flag SKUs approaching the 181-day threshold before charges apply.
Profasee Research's State of Amazon Seller Operations 2026 puts stock position inside the same decision as price and ad spend — the three move each other, and the report prices the gap.
A reorder point is not a warehouse decision — it is a pricing decision. Over-order and aged-inventory surcharges land on the rate card; under-order and you lose the Buy Box on the exact ASINs the ads were paying for. Size the months-of-cover and the storage-fee consequence here, then confirm what carrying that stock does to contribution margin in the profit dashboard.
Source: Profasee Research, State of Amazon Seller Operations 2026 — a vendor-published benchmark report built from aggregated Profasee account data across $1M+ Amazon brands. Figures quoted verbatim, retrieved 19 Sep 2026. All 10 benchmarks with sources →
❓ Amazon FBA Reorder Point Calculator — Frequently Asked Questions → fees, limits, and worked examples