The Amazon aged inventory surcharge is the most politely named fee in the FBA stack, and most sellers read it exactly wrong. They look at the line item — a few hundred dollars a month — and conclude their slow stock is a minor annoyance. Then October arrives, storage rates triple, the surcharge tiers escalate, and the “minor annoyance” quietly becomes one of the worst-performing uses of capital in the business.
After managing hundreds of brands on Amazon, we treat the aged inventory report the way we treat return reasons: as a diagnostic, not a bill. This week made it timely — on July 15, Amazon announced its 2026 peak fulfillment surcharge (an average of +$0.32/unit on shipments from October 15 through January 14), which means every unit of dead stock you’re still holding in October will be sitting in the most expensive warehouse space of the year. Your Q4 storage bill is being decided by what you do with July’s aged inventory report.
Here’s the full math.
The Fee Everyone Misreads: It Starts at 181 Days, Not 365
Old blog posts still describe “long-term storage fees” that kick in at 271 or 365 days. That structure is gone. The aged inventory surcharge now begins at 181 days and escalates monthly, charged per cubic foot on top of your normal monthly storage fee. The published tiers as of this writing (always confirm against Seller Central’s live fee page before making decisions):
| Inventory age | Surcharge (per cu ft, monthly) |
|—|—|
| 181–210 days | $0.50 |
| 211–240 days | $1.00 |
| 241–270 days | $1.50 |
| 271–300 days | $3.80 |
| 301–330 days | $4.00 |
| 331–365 days | $4.90 |
| 365+ days | $6.90 (or $0.15/unit, whichever is greater) |
Notice the design. The step from 270 to 271 days is not gradual — the rate more than doubles. Amazon built an escalator specifically to force a decision, and the sellers who pay the most are the ones who never make one.
The Four Stacked Costs (the Surcharge Is the Smallest)
Like a return or a stockout, aged inventory costs you in layers, and the visible line item is the shallowest one.
Cost 1: The surcharge itself. Real, but modest at early tiers. This is the only cost most sellers count.
Cost 2: Base storage — which triples in Q4. Standard-size monthly storage runs roughly $0.78/cu ft from January through September, then jumps to roughly $2.40/cu ft October through December. Dead stock held into Q4 pays holiday rent for space your Q4 sellers actually need. And with the new peak fulfillment surcharge landing October 15, every fulfillment center dollar is about to get more expensive at once.
Cost 3: Locked capital. This is the one the P&L never shows. Every dollar of COGS sitting in a fulfillment center at 250 days of age is a dollar you can’t put into inventory that turns. If your winners turn 6x a year at a 30% contribution margin, $10,000 trapped in dead stock isn’t costing you $10,000 — it’s costing you the contribution those dollars would have generated in SKUs that sell. That’s the real reason aged inventory is a growth problem, not a housekeeping problem.
Cost 4: The exit haircut you’ll eventually pay anyway. Here’s the uncomfortable math nobody runs: dead stock almost never becomes live stock. If the endgame is liquidation at 5–10% of average selling price, or removal at roughly a dollar a unit, that haircut is coming whether you take it in July or in January. Waiting doesn’t avoid the loss — it adds six months of storage and surcharge on top of it.
A Worked Example: 1,000 Units You Keep “Just in Case”
Take a $24.99 home goods SKU, $6.20 landed COGS, packaged at 12×9×3 inches — 0.1875 cu ft per unit. A 1,000-unit batch (187.5 cu ft) that landed in mid-January crosses 181 days in mid-July. Assume it’s effectively stopped selling and you hold it through December “to see if Q4 saves it”:
| Month | Base storage | Aged surcharge | Monthly total |
|—|—|—|—|
| July (181–210 days) | $146 | $94 | $240 |
| August (211–240) | $146 | $188 | $334 |
| September (241–270) | $146 | $281 | $427 |
| October (271–300) | $450 | $713 | $1,163 |
| November (301–330) | $450 | $750 | $1,200 |
| December (331–365) | $450 | $919 | $1,369 |
Six-month carrying cost: roughly $4,700 — on inventory whose entire COGS was $6,200. If it then liquidates in January at $2/unit, you recover $2,000. The identical liquidation executed in July would have recovered the same $2,000 without the $4,700. Holding didn’t preserve the asset’s value; it paid rent on a loss.
That’s the core insight of this whole deep-dive: the surcharge isn’t the cost. The surcharge is the notification. Amazon is telling you, in escalating monthly installments, that a decision is overdue.
Case Study: The “It Still Sells a Few a Week” Trap
A home and kitchen brand we manage — roughly $140K/month across 34 SKUs — came to us carrying about 2,600 stale units across four discontinued colorway variants, roughly $16K in COGS. The owner’s defense was one we hear constantly: “They still sell a few a week.”
Combined, the four variants sold 11 units a week. At that velocity, 2,600 units is a four-and-a-half year supply — with the entire pile crossing into the $3.80+ surcharge tiers before Black Friday. Projected carrying cost through Q4: roughly $1,100/month and climbing, on variants earning maybe $250/month in contribution. The inventory wasn’t an asset. It was a subscription.
The July triage we ran instead: a 40% price cut plus coupon flushed about 900 units in six weeks at roughly breakeven after fees. An Amazon Outlet deal (eligible once inventory passes 90 days of age) cleared another 700. The remaining 1,000 came out on a removal order to their 3PL for off-Amazon liquidation. Net recovery: about $11K against COGS — versus a projected January outcome of a $4K liquidation check after paying peak-season rent all fall. The delta between deciding in July and deciding in January was five figures on a $16K problem.
The July Triage System
Run this once a month, and run it hardest in July — the last cheap month to act before peak rates:
One caveat so this isn’t misread: genuine seasonal inventory with proven sell-through history — patio in March, gift sets in November — can rationally sit through a slow season. The difference is a dated plan with a demand forecast behind it versus a hope. Aged inventory with a plan is a position. Aged inventory without one is a fee generator.
FAQ
When does the aged inventory surcharge actually start?
At 181 days of fulfillment center age, charged monthly per cubic foot on top of base storage. If you’re working from advice that says 271 or 365 days, it’s stale — the escalator starts earlier and steps steeply after 270.
Is removal or liquidation better math?
Depends on your off-Amazon options. Liquidation is one click and recovers roughly 5–10% of ASP. Removal costs roughly a dollar a unit and only wins if you have a real resale channel — a 3PL feeding eBay, your own site, or a B2B buyer. If removed units will sit in a garage, liquidation’s small check beats a second storage bill.
Does aged inventory hurt anything besides fees?
Yes — it drags your IPI score and storage utilization ratio, which can constrain the capacity limits you need for the SKUs that actually sell. Dead stock doesn’t just cost money; it can crowd out your winners’ Q4 restock.
Should I sell below margin just to flush units?
Often, yes. Once a SKU is in the surcharge tiers, “holding for full price” means losing money monthly with certainty against the chance of a sale. A breakeven or slightly negative flush that stops the meter usually beats the alternative — do the six-month carrying math above before protecting a price nobody is paying.
If you’re looking for a team that manages every lever — creative, advertising, and operations — Velocity Sellers works with brands doing $100K+/month on Amazon. Contact us for a free account audit.
