Amazon runs Q4 on two fee calendars. Peak storage rates apply from October 1 through December 31. Peak fulfillment fees apply from October 15 through January 14, averaging roughly $0.32 more per unit, with the 3.5% fuel and logistics surcharge calculated on the peak fee rather than the base one. Because the windows don’t align, October 1–14 is a fortnight where storage is already expensive and fulfillment isn’t, and January 1–14 is a fortnight where fulfillment is still expensive and storage has reset. The peak rates themselves are the small part. What actually moves Q4 margin is how many weeks of supply are sitting in FBA when the storage calendar flips, and how old those units are — both decided in September.
What changes on which date?
| Date | What changes |
| Now through Sept 30 | Cheapest storage of the year. Standard-size roughly $0.78–$0.87/cu ft/month |
| Oct 1 | Peak storage begins. Standard-size rises to roughly $2.25–$2.40/cu ft/month — about 3× |
| Oct 15 | Peak fulfillment fees begin, averaging about +$0.32/unit, with the 3.5% surcharge on top |
| Oct 31 | Last date AWD sellers on automatic replenishment keep off-peak monthly storage rates |
| Dec 31 | Peak storage ends |
| Jan 14, 2027 | Peak fulfillment ends |
Published rate figures for 2026 disagree — standard-size peak storage appears as both $2.25 and $2.40, off-peak as both $0.78 and $0.87. Pull your own from Seller Central before you price. The structure holds either way.
Why doesn’t shipping early avoid the peak fulfillment fee?
Because the fee attaches to the date the order ships to the customer, not the date the inventory arrived at Amazon. Every unit that sells after October 15 pays the peak fulfillment fee no matter when you sent it in. Shipping in September protects you from peak storage on the September portion, and that is the whole of the benefit.
The same schedule covers FBA, Remote Fulfillment with FBA, Multi-Channel Fulfillment and Buy with Prime. If you fulfill Shopify or Walmart orders out of FBA stock, those units carry the peak premium too — which is the line most DTC cost models leave at off-peak rates for the whole quarter.
How do four charges land on one unit?
The base peak rate applies to everything. Three conditional charges fire independently on top of it: the aged inventory surcharge from day 181, the storage utilization surcharge above roughly 22 weeks of supply, and the low-inventory-level fee below the days-of-supply floor. A single overstocked, aged unit can pay four at once.
A 0.20 cu ft SKU at $32.99 retail, $8.50 landed COGS, 12% referral, inbounded in early July and still sitting in November at 24 weeks of supply:
| Line | Off-peak, healthy velocity | November, aged + overstocked |
| Referral (12%) | −$3.96 | −$3.96 |
| FBA fulfillment | −$3.90 | −$3.90 |
| Peak fulfillment surcharge | — | −$0.32 |
| Fuel & logistics (3.5%) | −$0.14 | −$0.15 |
| Base monthly storage | −$0.16 | −$0.47 |
| Aged inventory surcharge (181+) | — | −$0.25 |
| Storage utilization surcharge | — | −$0.09 |
| Inbound placement (single destination) | — | −$0.65 |
| COGS | −$8.50 | −$8.50 |
| Contribution | $16.33 (49.5%) | $14.70 (44.6%) |
Just under five points of margin, $1.63 a unit, roughly $8,150 across 5,000 units — and none of it visible in the fulfillment fee line. The timing trap sits underneath: stock that lands in FBA in early July crosses day 181 in early January, so anything bought for Q4 that doesn’t sell enters the aged band immediately after the season it was bought for.
What can you still change before October 1?
Depth, and age. Both are per-SKU numbers you can read today.
The rule of thumb that holds up is 4–8 weeks of supply inside FBA during peak, with the rest staged in AWD or a 3PL at $0.20–$0.45/cu ft and replenished on sell-through. Send 90 days of supply in September and you pay roughly 3× storage on stock that sits through November and December. On 3,000 units of a 0.20 cu ft SKU, that’s 600 cubic feet — about $492 a month off-peak against roughly $1,398 a month at peak rates, or a $2,718 difference across the quarter.
sellerboard’s Inventory Planner is where that decision gets made rather than guessed: days of stock left per SKU calculated from your own sales velocity, recommended reorder quantity and ship-in date, AWD stock synced alongside FBA stock so you can see the split you’re actually holding, and stock valuation for what the depth is costing you in tied-up cash. Sorting by days of stock left before October 1 is a ten-minute pass that separates the SKUs to inbound now from the ones to clear now.
The utilization surcharge has its own Q4 quirk worth planning around: the ratio compares inventory volume against trailing 13-week shipped volume. Inbound heavily in September and your inventory volume jumps while shipped volume still reflects the slower baseline, so the surcharge can trigger on units barely a month old.
The floor side is covered too — sellerboard runs a weekly check and alerts on products Amazon has flagged for the low-inventory-level fee in the coming week, which now applies at FNSKU level rather than parent ASIN. Variation-heavy catalogs can carry healthy aggregate coverage and still get charged on the child that ran thin.
How do you know what Q4 actually cost you?
By reading charged fees rather than estimated ones. Peak season is when a dimension or weight misclassification is most expensive, because every error gets multiplied by the peak rate. sellerboard’s P&L breaks storage, fulfillment and referral out as separate lines from settlement data, and the per-product view shows net profit per unit — so a SKU whose contribution quietly dropped four points on October 15 shows up as a margin change in the same week, not as a surprise in the January settlement. That’s also the window in which fee overcharges can still be claimed.
Common mistakes
- Treating Q4 as one date. Two calendars, four weeks of misalignment at the edges.
- Assuming early shipping avoids peak fulfillment. It attaches to the ship date.
- Modeling the base peak rate and stopping. For any seller carrying aged or excess stock, the conditional surcharges are the larger number.
- Forgetting MCF inherits the surcharge. Off-Amazon orders fulfilled from FBA pay peak too.
- Taking the minimal inbound split. A one- or two-destination shipment costs roughly $0.14–$1.50 per unit in placement fees; a five-way split drops it to zero, often for less than the freight saving.
- Letting January drift. Post-holiday clearance in the first two weeks of January pays peak fulfillment on already-discounted units.
- Not clearing the 181-day band before October. Aged surcharge plus peak storage plus utilization surcharge on one unit is fully avoidable, and the decision point is now.
FAQ
When exactly do peak fees start? Storage October 1 through December 31. Fulfillment October 15 through January 14, 2027.
How much more is it? Fulfillment averages about $0.32 more per unit and scales with size and weight. Standard-size storage roughly triples. The 3.5% fuel and logistics surcharge applies on top of the peak fulfillment fee.
Can I dodge peak fulfillment by shipping in September? No. It follows the customer ship date. September inbounding only saves storage on the pre-October portion.
How much should I send in? For most catalogs, 4–8 weeks of supply inside FBA, with depth staged in AWD or a 3PL and replenished on sell-through.
Will Q4 inbounding trigger the storage utilization surcharge? It can, and it’s the most common trigger, because inventory volume rises before shipped volume catches up. Sellers below 25 cubic feet of average daily inventory, Individual-plan sellers and sellers within their first year of FBA are exempt.
When should removals go out? Early enough for units to leave the network before October 1 and before crossing an aged band — which in practice means initiating in August or the first days of September, since processing takes weeks.
Q4 multiplies every inventory decision already on the books. The peak surcharge is thirty cents; tripled storage on stock that shouldn’t be in the network, an aged surcharge on units that crossed day 181 in November, and a utilization surcharge triggered by inbounding depth too early are the rest of it. All of them are set before October, and all of them start as one number per SKU: days of stock left.
