If you run Amazon PPC ads, you've stared at your ACOS number countless times. "Is 25% good? Is 40% bad? Should I pause this campaign?"
But here's the thing — ACOS alone can be misleading. Let me explain why TACOS might be the metric you should actually be watching.
What is ACOS?
ACOS = Ad Spend ÷ Ad Sales × 100
Example: $100 ad spend ÷ $400 in ad sales = 25% ACOS
ACOS tells you: "For every dollar I made from ads, how much did I spend on ads?"
A 25% ACOS means you spent $0.25 for every $1 of ad revenue. Sounds straightforward, right? Here's where it gets tricky.
The Problem with ACOS
ACOS only measures ad-attributed sales — sales that Amazon directly links to an ad click. But ads do more than just drive direct sales:
- Brand awareness — someone sees your ad, doesn't click, but searches for your product later and buys organically
- Ranking boost — more sales (even from ads) improve your organic ranking, which drives free sales
- Halo effect — ads for Product A can drive sales of Product B in your catalog
If you only look at ACOS, you might pause a campaign that's actually driving organic growth.
What is TACOS?
TACOS = Ad Spend ÷ Total Sales × 100
Total Sales = Ad Sales + Organic Sales
Example: $100 ad spend ÷ $1,000 total sales = 10% TACOS
TACOS tells you: "What percentage of my ENTIRE revenue goes to advertising?"
This is a much more honest picture because it includes the organic sales that your ads helped generate.
Why TACOS is More Important
Scenario: The "Bad" ACOS That's Actually Great
Month 1:
- Ad Spend: $500
- Ad Sales: $1,000 → ACOS: 50% (looks terrible!)
- Organic Sales: $4,000
- Total Sales: $5,000 → TACOS: 10% (actually great!)
If you only looked at the 50% ACOS, you'd panic and cut your ad budget. But the reality is your ads are only consuming 10% of your total revenue — and they're probably fueling those $4,000 in organic sales by keeping your product ranked high.
Scenario: The "Good" ACOS That's Actually Bad
A different product:
- Ad Spend: $500
- Ad Sales: $2,500 → ACOS: 20% (looks great!)
- Organic Sales: $200
- Total Sales: $2,700 → TACOS: 18.5% (actually concerning)
The ACOS looks good at 20%. But almost all your sales come from ads — you have virtually no organic sales. If you stop advertising, your sales drop to $200. You're addicted to ads.
What Should Your Targets Be?
| Metric | Good | Okay | Bad |
|---|---|---|---|
| ACOS | < 15% | 15-30% | > 30% |
| TACOS | < 8% | 8-15% | > 15% |
Important: These are general benchmarks. Your actual targets depend on your category, margins, and business stage. A new product launch might have 40%+ ACOS for weeks — and that's okay because you're buying ranking.
The Healthy Trend to Watch
The ideal pattern over time is:
- ACOS stays stable or decreases — your campaigns are getting more efficient
- TACOS decreases even faster — your organic sales are growing relative to ad spend
- The gap between ACOS and TACOS widens — this means organic is growing, which means your ads are building lasting value
If ACOS and TACOS are nearly the same number, you have an organic sales problem — your product isn't selling without ads.
How to Track This in SellerPulse
SellerPulse pulls both ad sales (from Amazon Advertising API) and total sales (from SP-API Order Metrics) daily. On the Advertising Performance dashboard you can see:
- ACOS and TACOS side by side with color-coded thresholds
- Trend charts showing how both metrics change over time
- Period comparison (this month vs last month)
- Per-campaign ACOS breakdown
- Organic sales calculated as: Total Sales - Ad Sales
- 7-day, 14-day, and 30-day attribution window toggles