Overview

Amazon advertisers must constantly weigh how much they spend on ads against the revenue each ad generates. The metric that captures this balance—Advertising Cost of Sale (ACoS)—should be set deliberately, using recent performance data as a guide. Establishing realistic ACoS targets now helps sellers keep campaigns profitable, avoid wasted spend, and sustain healthy margins while still pursuing growth.

Key Points

• Historical floor — If a SKU has consistently recorded an ACoS around 40 % and never dropped below 30 %, the 30 % figure becomes the practical minimum for any new target.
• Category similarity — Listings that share the same category, price range, or keyword intent often exhibit comparable ACoS ranges, allowing sellers to apply the same target across those products.
• Product lifecycle — New launches usually need a higher ACoS ceiling than established best‑sellers because they require extra exposure to collect reviews and build ranking.
• Ad type variance — Sponsored Brands campaigns typically tolerate a larger ACoS than Sponsored Products, since the former focuses on brand awareness rather than immediate sales.
• Margin alignment — The chosen ACoS must stay below the product’s net profit margin; a 30 % ACoS on an item with only a 20 % margin would eliminate profit entirely.
• Seasonal flexibility — During high‑traffic events such as Prime Day or the holiday season, a modest lift in target ACoS can capture additional demand without severely harming overall ROI.

How Setting ACoS Targets Works

1. Gather recent performance data — Export the last 30 days of advertising metrics for the SKU; for instance, a product that posted a 42 % ACoS last month provides the starting reference point.
2. Determine the sustainable low point — Identify the lowest ACoS the campaign has ever achieved in that window; if the campaign never fell under 31 %, that becomes the realistic floor for a new target.
3. Cross‑check with profit margin — Compare the floor ACoS to the product’s net margin; a 31 % target on a product with a 38 % margin leaves a 7 % profit buffer, which is generally acceptable.