3.5 percent on top of 2.25 dollars per cubic foot is the arithmetic of this quarter’s fulfilment bill: a fuel and logistics surcharge applied to peak fees that run from October 15, 2026 through January 14, 2027, and a storage rate that doubles for inventory aged 31 to 365 days. The two lines are published by different companies, they start on different dates, and they land on the same order. As of November 13, 2026, the seller who reconciles them separately is the one who finds the gap.
Four schedules, one invoice
A single order can now carry four charge schedules at once: the marketplace’s peak fulfilment fee, the surcharge computed on that fee, the storage charge computed by volume and inventory age, and a carrier demand charge computed by service and zone (the Q4 fee checkpoints). Each has its own start date and its own basis, and only one of them is a percentage of the order.
The basis is where most manual reconciliations go wrong. The 3.5 percent surcharge applies to applicable fulfilment-fee amounts, including peak fees, and not to the order value or to every charge on the statement. Multiplied against the order, it looks trivial. Multiplied against the fee, on a low-price item with a high fulfilment cost, it is a different number.
| Charge | Window | Basis | Effect on a 40 dollar order |
|---|---|---|---|
| Peak fulfilment fee | October 15, 2026 to January 14, 2027 | Per unit, by size tier | Raises the cost per shipped unit |
| Fuel and logistics surcharge | Aligned to the peak fee window | 3.5 percent of applicable fee amounts | About 1.50 dollars on a fee of 43 dollars, more when fees rise |
| Storage, aged 31 to 365 days | October to December | 2.25 dollars per cubic foot per month | Punishes inventory that did not sell in October |
| Carrier demand charge | Carrier-specific seasonal window | Service, account and volume conditions | Applies only to the shipments routed through that service |
Why the surcharge is not 3.5 percent of the order
Because it is charged on the fee. A seller who models it against revenue will understate it by roughly an order of magnitude on cheap, heavy items, and will overstate it on expensive, light ones. The published fee schedule publishes the fee schedule by size tier, which is the only basis on which the surcharge can be calculated honestly.
How a 1.50 dollar line removes 18.75 percent
The worked example from the fee review is deliberately small. A 40 dollar sale with 32 dollars of product, advertising and fulfilment cost leaves 8 dollars of contribution before overhead and tax. An extra 1.50 dollars of seasonal cost takes that to 6.50, an 18.75 percent decline with no change in selling price (the contribution example). The discount did not move. The contribution did.
Where the seasonal cost hides in a dashboard
It hides in the gap between the sales dashboard and the settlement statement. A dashboard reports revenue and units. A settlement statement reports fees by type, and the seasonal lines appear there as separate entries that arrive weeks after the orders they belong to. A promotion evaluated on dashboard data is evaluated on a cost base that is missing its most seasonal component.
The industry trend inside a fee schedule
Read as an industry trend rather than a price list, the schedules point the same way: platforms are moving cost from a percentage of revenue toward a set of dated, volumetric charges. Storage priced by cubic foot and inventory age rewards velocity. Fulfilment priced by size tier rewards small, light packaging. Neither rewards the seller who holds stock to protect availability.
Consumer demand has bent in a compatible direction, with restocking of basics running well above prior averages during the promotional window. That combination, dated fees plus restock demand, puts a premium on getting the unit economics right per item rather than per campaign.
What to reconcile before the next promotion
The reconciliation is four lines long and it belongs to finance rather than to the ads team: fee per unit in the current window, surcharge on that fee, storage per cubic foot for the inventory actually held, and the carrier charge for the services used. Anything else is an estimate (the November seller changes).
None of the four lines is large on its own. Together they decide whether a promotion that looks flat on price still earns its place, and that calculation has to happen before the discount is filed, not after the settlement arrives.
FAQ
Is the 3.5 percent surcharge charged on the order value?
No. It applies to applicable fulfilment-fee amounts, including peak fees. Modelling it against revenue misstates it in both directions depending on item price and weight.
Why does storage pricing matter for availability?
Because it is charged by cubic foot and by inventory age. Holding extra stock to protect availability now carries a dated cost, so the trade-off has to be calculated per SKU rather than assumed.
What should be reconciled first?
The fee per unit under the current schedule. Every other seasonal line is calculated on top of it, so a stale fee figure carries the error through the whole promotion.
