Original research
Marketplace Fee Impact Reports
Independent analyses quantifying how each fee change actually affects seller margin — with methodology, sample size, and affected categories disclosed up front.
Amazon FBA Fee Restructure 2026: Quantifying the 12–16 oz Reclassification
The May 2026 FBA restructure quietly moved items in the 12–16 oz band into a higher fulfillment tier. For sellers concentrated in Home & Kitchen and Toys, the per-unit fulfillment cost rose by $0.42 on average — a ~7.7% increase on the previous tier rate.
Low-Inventory-Level Fee: Who Actually Pays It Now
Raising the trigger to 28 days of supply roughly doubles the number of SKUs exposed to the fee. For lean-inventory sellers practicing JIT, the effective hit is ~0.8% of revenue on affected items — a meaningful drag on already-thin margins.
Walmart Sporting Goods Referral Cut: A Real Win for Mid-Market Sellers
Walmart cut the sporting goods referral fee from 15% to 13% for items under $100 — a rare downward adjustment. On a $49.99 SKU, this is roughly $1 of margin returned to the seller per unit, with no operational changes required.
Methodology, briefly
Every report draws on the same underlying fee database and change feed. We document the sample, the assumptions, and the source URLs — so every number can be traced back to a public marketplace policy page.
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