A framework for setting Total Advertising Cost of Sales targets by category, lifecycle stage and P&L reality.
Why TACOS beats ROAS
Vanity ROAS is the death of Amazon P&Ls. TACOS — Total Advertising Cost of Sales — is the metric that ties ad spend to total revenue, and it's the number your CFO will actually care about.
The three inputs
The framework we use with clients has three inputs: contribution margin, lifecycle stage and category dynamics. High-margin, growth-stage products in defensible categories can tolerate 15–25% TACOS. Low-margin, mature products in commoditized categories need to sit at 5–10% or the P&L breaks.
Modelling your ceiling
Start by modelling your unit economics with COGS, Amazon fees, storage, returns and creative amortization. What's left is your ceiling for ad spend. Divide by expected sessions and multiply out — that's your defensible TACOS target.
Holding the target
Then hold to it weekly. TACOS discipline compounds: brands that hold a target through a full year almost always end with better organic rank, higher LTV and healthier margin than brands chasing ROAS spikes.