Operator guides
Amazon profitability guides
Written by brand operators. On contribution margin, real profit, fee math, and the decisions that actually move the needle on Amazon.
Amazon Contribution Margin
What it is, how to calculate it, and why revenue is a vanity metric.
Your True Amazon Profit
The full P&L stack most sellers never see in one place.
2026 Amazon Fee Changes
Every fee that changed, why it changed, and what to model going forward.
Hidden Amazon Fees
The fees buried in Seller Central that erode margin without a line item.
Effective Referral Rate
Why your real referral rate is higher than the listed percentage.
Category Migration Plays
How moving to a lower-fee category can save 3–7% in referral fees.
ACoS vs TACoS
Why ACoS alone is misleading and what TACoS tells you that ACoS can't.
COGS Allocation on Amazon
How to correctly allocate landed cost per unit for P&L modeling.
Days of Cover Formula
How to calculate DOS and avoid the low inventory level fee.
IPI Score Guide 2026
How IPI affects storage limits and the storage utilization surcharge.