Amazon's headline for this year's peak season is that holiday fulfillment fees average $0.32 per unit, unchanged from last year. That number is accurate and close to useless for planning, because it describes one layer of a cost structure that now runs four deep.

Here's what's actually landing on sellers between October and January.

Layer One: FBA Peak Fees, October 15 to January 14

The $0.32 average covers a range that varies enormously by size tier. Small standard items like phone cases run about $0.19 per unit. T-shirt-sized items run about $0.39. Oversized items like televisions hit approximately $2.81 per unit.

The timing trigger matters more than most sellers realize. Fees are calculated when shipments leave fulfillment centers, not when you sent inventory in. Anything shipping on or after October 15 pays peak rates regardless of when it arrived at Amazon.

Layer Two: The 3.5% Fuel Surcharge That Never Left

Amazon introduced a 3.5% fuel and logistics surcharge in April. It applies on top of peak fulfillment fees, and when a seller asked when it expires, an Amazon representative said it remains in effect until further notice.

Worth noting for your math: Amazon calculates the 3.5% from the fulfillment fee, not the product's selling price.

Layer Three: The Base Fee Increase From January

This is the layer most peak-season coverage skips. Amazon raised US base FBA fulfillment fees by an average of roughly $0.08 per unit back in January, part of the broader 2026 fee restructure that also introduced three price tiers and raised placement fees by up to 179% for some size categories.

So the peak surcharge isn't stacking on last year's baseline. It's stacking on a baseline that already moved. For a T-shirt-sized SKU, the all-in year-over-year increase runs closer to $0.62 per unit than the $0.32 headline suggests.

Layer Four: Amazon Shipping's Separate Surcharge Schedule

If you use Amazon Shipping for FBM orders, that's an entirely different surcharge running on a different calendar: October 25 through January 16, split into three windows.

The per-package demand surcharge runs $0.50 during the shoulder periods, October 25 to November 21 and December 27 to January 16, rising to $0.75 during the November 22 to December 26 peak window. That's a 25% year-over-year increase in both windows.

The accessorial fees are where the real damage sits for anyone shipping bulky goods. During the peak window, additional handling climbs from $8.75 to $11.90, large package fees from $96.25 to $117.50, and extra heavy package fees from $530 to $590.

The FBM Wrinkle: USPS Adjusting Charges Retroactively

FBM sellers using USPS face something different in kind. USPS's Automated Package Verification system retroactively adjusts historical shipping costs, and Flat Rate envelope charges dating back to January have been collected after the fact, with postal verification fees falling on sellers.

That's not a future cost you can model into Q4 pricing. It's a past cost arriving now.

What This Actually Means for Your Q4 Model

If you built your holiday pricing around $0.32 per unit, rebuild it. The realistic number for a mid-size SKU is closer to double that once the fuel surcharge and January base increase are included, and oversized sellers are looking at $2.81 in peak fees alone before anything else stacks on top.

Run the math per size tier rather than using the blended average, since the gap between $0.19 and $2.81 means the average describes almost no one's actual catalog. If you use both FBA and Amazon Shipping, model them separately, because they run on different date windows and different fee structures.

One planning note worth acting on now: sellers using Amazon Warehousing and Distribution with automatic replenishment keep paying off-peak monthly storage rates through October 31, two weeks past when peak fulfillment fees begin. That's a narrow window, but it's real money if your inventory timing lines up.

The broader point is that increased sales volume during promotional periods doesn't automatically translate to increased net profit this year. With four fee layers moving at once, it's entirely possible to sell more units in Q4 and finish with less profit than last year.