7 Proven Strategies to Reduce Your Amazon ACOS by 40%

ACOS (Advertising Cost of Sale) measures how much you spend on ads for every rupee of ad-driven revenue. A high ACOS quietly erodes your margin. The good news: most accounts are wasting 30–50% of their ad spend on targets that will never convert profitably.

Here are the seven strategies we use to bring ACOS down while protecting — and usually growing — total sales.

The 7 strategies

• Harvest search terms weekly — promote converting terms to exact-match manual campaigns and move budget away from broad guesswork.
• Build a negative-keyword library — block irrelevant and non-converting terms so you stop paying for clicks that never buy.
• Separate branded and non-branded campaigns — your own brand terms convert cheaply and shouldn't be averaged in with prospecting.
• Right-size bids by placement — top-of-search often converts best; adjust placement modifiers instead of one flat bid.
• Fix the listing before scaling ads — ads amplify your conversion rate; a weak listing makes every click more expensive.
• Dayparting — reduce bids during hours that historically waste spend with low conversion.
• Set target-ACOS rules per product — a hero product and a clearance item should not share the same ACOS goal.

Measure the right way

Don't judge ACOS in isolation. A higher ACOS on a launch campaign that's winning organic rank can be more profitable long-term than a low-ACOS campaign that's stalled. Track TACoS (total ad cost of sale) alongside ACOS to see the full picture.

Key takeaway

ACOS reduction is about discipline, not magic. Tighten targeting, cut waste weekly, and reinvest the savings into the keywords that actually convert. Done consistently, a 40% reduction is realistic within 60–90 days.