Q4 storage is the most expensive real estate you rent all year
Monthly FBA storage rates rise for the peak quarter, and aged units get surcharged on top. The triage that saves the money has to happen before your Q4 stock lands, not after.
September 18, 2026 · 6 min read
Amazon charges monthly storage on the cubic volume you occupy, and the rate is higher during the peak selling quarter than during the rest of the year. On top of that, units that have been sitting in the network for a long time attract an aged-inventory surcharge that scales with how long they have sat. The two costs stack, and they are both charged on space rather than on sales.
That combination has an uncomfortable implication. The stock most likely to be expensive in Q4 is the stock that did not sell in Q1 through Q3 — the units you have already stopped thinking about. Meanwhile your new peak-season inventory is arriving to sit beside it, in the same higher-priced warehouse space.
Storage cost is a volume problem, not a unit problem
Sellers instinctively count units. Amazon bills cubic feet. A pallet of a light, bulky SKU can cost more to store than ten times as many units of something dense and small, and per-unit thinking hides that completely.
So the first thing to do is rank your SKUs by the storage cost they generate, not by how many units are on hand. Take average volume held over the month, apply the seasonal rate, and you get a real monthly rent figure per SKU. Then compare each SKU’s rent against the gross profit it actually produced in the same period. Anything paying more rent than it earns margin is not slow-moving inventory; it is a subscription you are paying Amazon.
Sort every SKU into one of four buckets
Before peak, force a decision on every SKU with stock in the network. Four outcomes, no fifth:
- Restock — sells at healthy velocity and healthy margin, and the storage cost is small relative to the profit. Send more, and time the arrival so it is not sitting for weeks before demand starts.
- Hold flat — sells, but slowly. Do not add units. Let the existing depth run down through peak and re-evaluate in January.
- Discount to clear — sellable but overweight on cover. A markdown that moves units now is usually cheaper than paying peak storage and then an aged surcharge on the same units.
- Remove or dispose — not sellable, or sellable only at a price below the cost of continuing to store it. Removal has a fee; compare that one-off fee to several months of storage plus surcharge before assuming removal is the expensive option.
The number that decides it
For each SKU, work out roughly what it would cost to keep the current quantity in the network through the end of the year: monthly storage at the peak rate, times the months, plus any aged surcharge the units will accrue as they cross into older age bands. Compare that with the gross profit those units would generate if they sold at your current rate and price.
If the storage figure is a meaningful fraction of the profit figure, discounting or removing is not a defeat — it is the higher-return decision. Cash out of dead volume before peak is cash you can put into the SKUs that actually convert during peak.
Things that quietly inflate the bill
A few recurring causes, all fixable:
- Stranded and unsellable units still occupy space and still accrue storage. Clear those first — it is the same money with no markdown attached.
- Oversized or awkwardly packed items pay for air. Re-measure and, where it is legitimate, reduce packaging volume before shipping the next batch.
- Inbound timing: stock that arrives well ahead of demand pays peak storage for weeks before it earns anything.
- Multiple ASINs of near-identical products split velocity and multiply held volume for the same total sales.
- Returned units restocked as sellable can rebuild depth on a SKU you thought you had drawn down.
Do it on a calendar, not on a hunch
The decisions above only work in advance. Once peak rates apply and a removal takes time to process, you are choosing between paying the storage or paying the storage plus a removal fee. Set two dates: one review before your Q4 stock ships, and one in early January to decide what carries into the new year.
Keep a written record of what you decided per SKU and why. Next year the same SKUs will present the same argument, and a one-line note from last cycle beats re-deriving the judgement from scratch.
Where MySellerHQ fits
MySellerHQ reads inventory, fees, and sales from Amazon’s Selling Partner API with read-only permissions and lines up storage-and-fee cost against per-SKU profit, so the units paying more rent than they earn are visible before peak rather than after the December invoice. It does not remove inventory, change prices, or edit listings — writes are off by design. The call stays yours; the arithmetic does not have to be.