TACOS (Total Advertising Cost of Sale)
Ad spend as a percentage of total sales, beyond ad-attributed sales alone - a healthier long-term efficiency read than ACOS alone. Because it's measured against total revenue rather than just ad-attributed revenue, a falling TACOS over time - even with flat or rising ad spend - can signal that ads are driving organic sales growth too, beyond direct conversions.
In practice
Because it's measured against total revenue rather than just ad-attributed revenue, a falling TACOS over time - even with flat or rising ad spend - can signal that ads are driving organic sales growth too, beyond direct conversions.
A brand spends the same on ads month over month, but as organic rank improves, TACOS drops from 15% to 9% because total sales grew faster than ad spend.
Why it matters
It's the metric that actually answers whether advertising is paying for itself at the business level, rather than just performing well within its own ad account.
Worth knowing
- Combines total revenue (ad-driven and organic) as the denominator, instead of only ad-attributed sales.
- A healthy trend is TACOS declining over time as organic rank and repeat purchases grow.
- Useful for justifying continued ad spend to a stakeholder focused on the P&L, not campaign-level metrics.
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