ACoS vs TACoS on Amazon: What They Mean and Which Metric Matters More

Ask ten Amazon sellers how their ads are doing and most will quote their ACOS. But ACOS only tells part of the story. A brand can have a "great" ACOS and still be shrinking, or a "high" ACOS while its total business grows fast. That is why experienced sellers and agencies track TACoS alongside ACOS. This guide explains both metrics in plain English, how to calculate them, and how to use them together to make smarter advertising decisions.

What Is ACOS?

ACOS (Advertising Cost of Sale) measures how much you spend on ads for every dollar of sales those ads generate.

ACOS is ideal for day-to-day optimization: judging keywords, campaigns and bids. Its limitation is that it ignores organic sales — including organic sales your ads helped create.

What Is TACoS?

TACoS (Total Advertising Cost of Sale) compares ad spend with your total revenue — both ad-driven and organic.

Why You Need Both

On Amazon, ads and organic ranking are connected. Ad sales increase sales velocity, which helps organic rank, which brings more organic sales. ACOS cannot see that effect; TACoS can. Looking at the two together tells you what is really happening:

• ACOS steady, TACoS falling: Healthy growth. Ads are fueling organic sales — the ideal pattern.
• ACOS falling, TACoS rising: Organic sales are dropping. Ads may be covering up a listing, ranking or pricing problem.
• ACOS rising, TACoS falling: Often fine during a launch or rank push — ads cost more, but total sales are growing faster.
• ACOS and TACoS both rising: A warning sign. You are spending more without growing the business. Time for an audit.

What Is a Good ACOS and TACoS?

There is no universal target. The right numbers depend on your margins, category competition and the stage of each product.

Start with your break-even ACOS, which equals your profit margin before ad spend. If your margin is 35%, anything below 35% ACOS is profitable on the ad sale itself.

How to Improve ACOS Without Hurting Growth

• Negate wasted search terms that spend without converting.
• Move winning terms to exact match so you control their bids.
• Improve conversion rate with better images, pricing and reviews — the same clicks produce more sales.
• Lower bids on low-margin products and shift budget to hero ASINs.

Our step-by-step guide on how to reduce ACOS on Amazon goes deeper.

How to Lower TACoS Over Time

• Invest in organic rank: Strong Amazon SEO means more sales you do not pay for.
• Build your brand: Branded searches convert well and cost less. A Brand Store, A+ Content and Sponsored Brands all help.
• Grow reviews and ratings: Social proof raises conversion across both organic and paid traffic.
• Stay in stock: Stockouts destroy organic rank and force you to buy it back with ads.

Frequently Asked Questions

Where do I find TACoS in Seller Central?

Amazon does not always show TACoS as a single number. Calculate it by taking total ad spend from Amazon Ads and dividing by total sales from your Business Reports for the same period.

Is a low ACOS always good?

Not always. A very low ACOS can mean you are under-investing and leaving sales and rank to competitors. The goal is profitable growth, not the lowest possible ACOS.

What is ROAS?

ROAS (Return on Ad Spend) is the inverse of ACOS: ad sales divided by ad spend. A 25% ACOS equals a ROAS of 4.

Final Thoughts

ACOS tells you how efficient your ads are. TACoS tells you whether your ads are building a healthier business. Brands that manage both scale faster and more profitably than brands chasing a single number.

Want an expert view of your numbers? SellerTune's PPC management team will review your ACOS, TACoS and campaign structure. Get your free Amazon audit.