7 Proven Strategies to Reduce ACoS on Amazon

High Advertising Cost of Sale (ACoS) on Amazon is a common challenge that many sellers encounter. 

When a seller’s advertising costs become excessive, the opportunity for profit is lost, even if they have strong sales numbers. 

The good news is that there are several strategic, systematic methods for lowering your ACoS and returning profit through sustainable advertising efficiency by understanding how to optimize ACoS Amazon.

This guide presents seven effective, evidence-based strategies for lowering your ACoS without negatively affecting or reducing your sales performance. 

Each strategy has been proven through actual Amazon advertising campaigns and provides measurable results when it is properly implemented.

Strategy 1: Calculate and Target Your Break-Even ACoS

Understanding break-even pricing on Amazon starts here — your break-even ACoS is the single number that tells you whether your campaigns are building margin or quietly destroying it.

If you do not know this essential number, you are flying blind and cannot tell which of your advertising campaigns are making money and which are eating away at your profitability.

Why This Matters

Before optimizing anything, you must understand your profit margins and establish a realistic ACoS target. 

Many sellers operate without knowing their break-even point, making it impossible to determine whether campaigns are profitable.

How to Implement

Calculate your break-even ACoS using this formula:

Break-Even ACoS = [(Selling Price – COGS – Amazon Fees) ÷ Selling Price] × 100

Step-by-step process:

1. Determine your product’s selling price
2. Calculate the total cost of goods sold (COGS), including production and shipping
3. Calculate all Amazon fees (referral fees, FBA fees, storage fees)
4. Subtract COGS and fees from the selling price to find the net profit
5. Divide net profit by selling price and multiply by 100

Example calculation:

• Selling Price: $40
• COGS: $15
• Amazon Fees: $12
• Net Profit: $13
• Break-Even ACoS: 32.5%

Target Setting

Once you know your break-even ACoS, set your target 20-30% below this number to ensure profitability. If your break-even is 32%, target 22-25% ACoS for sustainable margins.

Key Insight: Review your break-even calculation quarterly as costs, fees, and pricing evolve. What was profitable six months ago may not be today.

Strategy 2: Implement Aggressive Search Term Optimization

Search term optimization is where most Amazon sellers leave money on the table. 

Your carefully selected keywords often trigger irrelevant searches that drain budget without ever converting into sales.

Why This Matters

Your keyword targeting is a suggestion to Amazon, but search term matching determines what actually triggers your ads. 

Most sellers discover that 30–40% of their ad spend, across Automatic campaigns and broad-match Manual campaigns, ends up wasted on irrelevant or low-converting search terms they never intended to target, which is exactly why adding negative keywords is the fastest way to cut that waste.

How to Implement

Weekly search term audit process:

1. Download your search term report from Campaign Manager
2. Sort by spend (highest to lowest)
3. Calculate ACoS for each search term
4. Identify terms with ACoS exceeding your target by 50% or more
5. Add irrelevant terms as negative keywords

Negative keyword strategy:

• Negative Exact Match: Block specific search phrases that are irrelevant
• Negative Phrase Match: Block any search containing specific words (e.g., “Low cost,” “free,” “used”)
• Negative Broad Match: Rarely recommended due to overly restrictive blocking

Common negative keyword categories:

• Price qualifiers: cheap, discount, bargain, budget
• Wrong customer intent: rental, lease, refurbished, used
• Competitor brands (if not your strategy)
• Wrong product variations: wrong size, color, or specifications

Expected Results

Aggressive search term optimization typically reduces ACoS by 10-20% within 30 days by eliminating wasted spend on non-converting traffic.

Real Example: A supplement seller targeting “collagen powder” found 28% of clicks came from searches containing “vegan,” “marine,” or “unflavored”, none of which matched their bovine, flavored product. 

Adding these as negative phrase matches reduced ACoS from 42% to 31% in three weeks.

Strategy 3: Structure Campaigns by Match Type and Intent

A chaotic campaign structure is one of the most common yet overlooked causes of inflated ACoS. 

When campaigns mix different match types, keyword intents, and products, you lose the ability to make informed optimization decisions based on clear data.

Why This Matters

Mixing match types, keyword intents, and products in single campaigns creates data confusion and prevents effective optimization. 

A clean campaign structure enables precise bid management and clear performance visibility.

How to Implement

Campaign structure framework:

By Match Type:

• Exact Match Campaigns: Highest control, typically best performance
• Phrase Match Campaigns: Moderate reach, requires monitoring
• Broad Match Campaigns: Discovery mode, lowest bids, aggressive negatives

By Keyword Intent:

• Branded Campaigns: Your brand name + category keywords (target: 12-18% ACoS)
• High-Intent Campaigns: Product-specific, purchase-ready keywords (target: 18-25% ACoS)
• Category Campaigns: Broader category-level keywords (target: 25-35% ACoS)
• Discovery Campaigns: Research and testing (accept: 35-45% ACoS temporarily)

By Product:

• Separate campaigns for each ASIN or tightly related variation groups
• Prevents budget cannibalization between products
• Enables product-specific optimization and budget allocation

Campaign Naming Convention

Use clear, systematic naming for easy management:

• [ASIN]-[Match Type]-[Intent]-[Date]
• Example: B08XX123-Exact-Branded-Nov2024

Expected Results

Proper campaign structure doesn’t immediately reduce ACoS but creates the foundation for all other optimization strategies. 

Within 60 days of restructuring, sellers typically see 15-30% ACoS improvement as they optimize each campaign type appropriately.

Strategy 4: Optimize Bids Based on Performance Data

Bid management separates profitable campaigns from money pits, yet most sellers either set bids once and forget them or make emotional adjustments without data. 

Performance-based bidding ensures every dollar flows toward keywords that actually deliver returns.

Why This Matters

Most sellers bid uniformly across keywords or make emotional decisions based on overall campaign performance. 

Performance-based bidding allocates budget efficiently by increasing spend on winners and reducing spend on losers.

How to Implement

Keyword performance classification:

After keywords accumulate 30+ clicks, categorize them:

Performance Tier	ACoS Range	Bid Action
Star Performers	0-50% of target	Increase bids 15-25%
Solid Performers	50-100% of the target	Maintain current bids
Marginal Performers	100-150% of target	Reduce bids by 25-30%
Poor Performers	150%+ of target	Reduce bids 50% or pause

Bid adjustment process:

1. Review keyword performance weekly
2. Make bid changes for keywords with sufficient data
3. Wait 7-10 days before making additional adjustments
4. Document changes to track impact

Placement bid modifiers:

Analyze performance by placement:

• Top of search (first page)
• Product pages
• Rest of search

Adjust placement modifiers based on conversion data. 

If top-of-search converts 40% better despite higher CPC, increase the modifier to 50-100% to capture more premium placements.

Bidding Strategy Selection

Down Only: Reduces bids for low-performing placements (conservative approach) 

Up and Down: Increases bids for high-performing placements, decreases for low-performing (recommended for established campaigns) 

Fixed Bids: No algorithmic adjustment (useful when you want complete control)

Related: Amazon Bidding Strategies: Pro Tips for Profitable PPC

Expected Results

Performance-based bidding typically reduces ACoS by 12-18% over 60 days while maintaining or increasing sales volume by reallocating budget to high-performing keywords.

Strategy 5: Improve Listing Conversion Rate

Your listing quality has a direct mathematical relationship with ACoS, improves conversion rate by 50%, and your cost per acquisition drops by 33%. 

Yet many sellers pour money into ads while ignoring the destination where that expensive traffic lands.

Why This Matters

Conversion rate directly impacts ACoS efficiency. 

If your listing converts at 8%, you need 12.5 clicks per sale. Improve conversion to 16%, and you only need 6.25 clicks per sale, cutting your cost per acquisition in half.

How to Implement

Image optimization:

• Main image: Professional photography, proper lighting, white background
• Secondary images: Show scale, features, use cases, and benefits
• Infographics: Highlight key selling points visually
• Lifestyle images: Demonstrate product in a real-world context
• Video: Show product functionality and usage

Copy optimization:

• Title: Include brand, primary keyword, key feature, size/quantity, main benefit
• Bullet points: Address customer pain points, not just features
• A+ Content: Create comparison charts, brand story, enhanced imagery
• Backend search terms: Maximize character limit with relevant keywords

Social proof elements:

• Target minimum 50+ reviews with 4.0+ star average
• Use our Amazon Vine management program for eligible new ASINs
• Respond to negative reviews professionally
• Use Amazon’s Request a Review feature
• Implement follow-up sequences (within Amazon’s terms of service)

Pricing strategy:

• Research competitive pricing in your category
• Use psychological pricing ($29.99 vs $30.00)
• Ensure pricing aligns with perceived quality
• Test small price adjustments and monitor conversion impact

Measurement

Track conversion rate in Business Reports > Detail Page Sales and Traffic. Monitor “Unit Session Percentage” for each ASIN.

Expected Results

A 3-5 percentage point improvement in conversion rate typically reduces ACoS by 15-25% while simultaneously improving organic ranking through better engagement metrics.

Real Example: A home goods seller improved the main image quality and rewrote bullets to focus on benefits rather than features. 

Conversion rate increased from 9.2% to 14.7%, and ACoS dropped from 38% to 26% over 45 days without any campaign changes.

Strategy 6: Eliminate Hidden Budget Waste in Campaign Settings

Beyond obvious optimization opportunities, hundreds or thousands of dollars leak through campaign settings that sellers configure once and never revisit. 

These silent budget drains compound over time, steadily eroding profitability without triggering any obvious alarms.

Why This Matters

Campaign settings configured once and forgotten often drain the budget silently. 

Automatic targeting, poor product targeting, and misaligned placements waste thousands of dollars without appearing in obvious metrics.

How to Implement

Automatic campaign audit:

• Review all automatic campaigns monthly
• After 60-90 days, harvest winning search terms into manual campaigns
• Pause automatic campaigns once the discovery phase is complete
• Exception: Keep automatic campaigns active for new product launches

Product targeting review:

• Analyze ASIN targeting performance monthly
• Remove ASINs with ACoS exceeding 150% of the target after sufficient data
• Focus on complementary products, not just competitors
• Verify products you’re targeting have good reviews and conversion rates

Placement optimization:

• Download the placement report from Campaign Manager
• Compare conversion rates across placements
• Disable consistently underperforming placements
• Common finding: “Rest of search” often outperforms “Product pages.”

Budget allocation audit:

• Identify campaigns consistently hitting budget caps (lost opportunity)
• Identify campaigns spending <50% of the budget with poor ACoS (waste)
• Reallocate budget from underperformers to proven winners
• Set appropriate budgets based on historical performance

Inventory management:

• Pause campaigns immediately when inventory drops below 30 days
• Avoid paying for awareness you cannot fulfill
• Resume campaigns when inventory is replenished

Expected Results

Eliminating hidden waste typically recovers 10-15% of ad spend, directly improving ACoS by redirecting budget to performing campaigns.

Strategy 7: Monitor Leading Indicators, Not Just ACoS

ACoS tells you what already happened last week or last month, giving you no warning before problems drain your budget. 

Leading indicators act as early warning systems, allowing you to intervene before small issues become expensive disasters.

Why This Matters

ACoS is a lagging indicator that reports what has already happened. 

Leading indicators predict ACoS movement before it appears in reports, enabling proactive intervention rather than reactive damage control.

How to Implement

Track these metrics daily or weekly:

Leading Indicator	What It Predicts	Action Threshold
Conversion Rate	ACoS will rise if CVR drops	2+ percentage point decline
Click-Through Rate	Relevance declining	15%+ decline week-over-week
Cost-Per-Click	Competition intensifying	20%+ increase month-over-month
Impression Share	Lost visibility	25%+ decline

Conversion rate monitoring:

• Track in Business Reports > Detail Page Sales and Traffic
• Monitor “Unit Session Percentage” weekly
• Investigate immediately if conversion drops 2+ percentage points
• Common causes: pricing changes, competitor promotions, suppressed content, declining reviews

Click-through rate analysis:

• View CTR in Campaign Manager at campaign and keyword level
• Declining CTR suggests poor ad relevance or a weakening competitive position
• Solutions: refresh ad creative, review keyword targeting, analyze competitor listings

Cost-per-click tracking:

• Monitor CPC trends in Campaign Manager
• Rising CPC indicates intensifying competition
• Consider bid reductions, alternative keywords, or improved Quality Score through better conversion

Impression share evaluation:

• Available in some third-party tools or estimated from impression trends
• Declining impressions suggest lost budget effectiveness or increased competition
• Solutions: increase bids/budgets strategically, check for policy violations

Dashboard Creation

Create a weekly dashboard tracking:

• Overall account ACoS
• ACoS by campaign type
• Conversion rate by ASIN
• Average CPC trends
• Top spending keywords and their ACoS
• Search terms needing negative keyword treatment

Expected Results

Proactive monitoring prevents 5-10% ACoS degradation by catching problems early. 

Sellers who track leading indicators maintain stable ACoS while reactive sellers experience constant fluctuation.

Strategy 8: Control Keyword Cannibalization Between Paid and Organic Rankings

Many sellers unknowingly overpay for traffic they could already win organically.

This “keyword cannibalization” silently inflates ACoS without increasing total revenue.

Why This Matters

When you rank organically in the top 3–5 positions for a keyword, Amazon Ads often steal clicks from your organic listing, not from competitors.

You still get the sale, but now you paid for it.

You still get the sale, but now you paid for it. This artificially increases ACoS while Amazon TACoS stays flat or worsens.

How to Implement

Step 1: Identify Cannibalized Keywords

Weekly or biweekly:

• Pull keyword-level ad performance
• Identify keywords where:
• Organic rank is Top 5
• Ad ACoS is higher than the account average
• CTR is low (often <0.4%)

These are strong cannibalization signals.

Step 2: Reduce, Don’t Pause

Instead of pausing:

• Reduce bids by 30–60%
• Lower placement modifiers (especially Top of Search)
• Observe impact for 10–14 days

If total sales remain stable while ad sales drop, you are paying for organic traffic.

Step 3: Keep Ads for Defense, Not Volume

For high-ranking keywords:

• Maintain low bids for brand defense
• Use ads primarily to:
• Block competitors
• Maintain visibility during promotions
• Protect ranking during seasonal fluctuations

Expected Results

• 5–15% ACoS reduction
• No loss in total sales
• Improved TACoS efficiency

Advanced Insight:

The better your organic rank, the less aggressively you should bid—this is the opposite of what most sellers do.

Strategy 9: Use Dayparting and Budget Timing to Eliminate Low-Intent Spend

Amazon traffic quality varies dramatically by time of day and day of week.

Yet most sellers run ads 24/7, paying for low-conversion traffic during poor-performing hours.

Why This Matters

Conversion rates often drop during:

• Late-night browsing hours
• Early mornings
• Certain weekdays (category-dependent)

Clicks still cost the same, but convert far worse, inflating ACoS.

How to Implement

Step 1: Analyze Time-Based Performance

Using:

• Amazon Marketing Stream
• Third-party PPC tools
• Or exported hourly reports (if available)

Look for:

• Hours with high CPC + low conversion
• Time blocks with ACoS are 30–50% worse than average

Most accounts find that 20–30% of spend happens during poor-conversion hours.

Step 2: Implement Dayparting

Common approaches:

• Pause ads during the worst-performing hours
• Reduce bids by 20–40% during low-conversion periods
• Concentrate the budget during peak buying hours

Typical patterns (not universal):

• Best: 9 AM – 9 PM local time
• Worst: 12 AM – 6 AM

Step 3: Align Budgets With Conversion Peaks

Ensure:

• Budgets don’t cap during high-conversion hours
• Discovery campaigns run only when data quality is highest

Expected Results

• 8–20% ACoS reduction
• Higher conversion rate without changing listings
• Better data quality for optimization decisions

Real Example:
A consumer electronics seller paused ads from 1 AM to 6 AM.
Result:

• Spend ↓ 18%
• Sales ↓ only 4%
• ACoS improved from 34% → 27% in 21 days

Why These Two Strategies Matter

Most ACoS guides focus on:

• Bids
• Keywords
• Negatives

These two strategies focus on:

• Demand efficiency
• Algorithm behavior
• Traffic quality

They don’t just reduce waste, they ensure you’re paying only for incremental sales, not sales you would have earned anyway.

Implementation Timeline: 90-Day ACoS Reduction Plan

Month 1: Foundation (Days 1-30)

Week 1-2:

• Calculate break-even ACoS for all products
• Download and analyze search term reports
• Add 50+ negative keywords based on historical data
• Audit the current campaign structure

Week 3-4:

• Restructure campaigns by match type and intent
• Begin daily search term monitoring
• Start listing optimization (images, copy, A+ Content)
• Establish baseline metrics for all KPIs

Expected Result: Minimal ACoS improvement, but clean foundation for optimization

Month 2: Optimization (Days 31-60)

Week 5-6:

• Implement performance-based bidding on all keywords with 30+ clicks
• Reallocate budget from underperforming to high-performing campaigns
• Continue aggressive negative keyword additions (20-30 per week)
• Test listing improvements

Week 7-8:

• Analyze placement performance and adjust modifiers
• Pause or reduce bids on consistent losers
• Increase bids on star performers below target ACoS
• Audit and optimize product targeting

Expected Result: 15-25% ACoS reduction from baseline

Month 3: Scaling (Days 61-90)

Week 9-10:

• Identify the top 20% of keywords by profitability and scale aggressively
• Harvest proven search terms into exact match campaigns
• Eliminate remaining hidden budget waste
• Establish weekly optimization rituals

Week 11-12:

• Fine-tune bid adjustments based on accumulated data
• Test new keyword opportunities conservatively
• Document successful strategies for replication
• Create an ongoing maintenance schedule

Expected Result: 30-45% ACoS reduction from baseline while maintaining or growing sales

Key Performance Indicators to Track

Monitor these metrics to measure strategy effectiveness:

Primary Metrics:

• ACoS: Target 20-30% below break-even
• TACoS: Total advertising cost / total sales (including organic)
• ROAS: Return on ad spend (inverse of ACoS)

Secondary Metrics:

• Conversion Rate: Target 10%+ for most categories
• Click-Through Rate: Monitor for relevance signals
• Cost-Per-Click: Track competitive intensity
• Impression Share: Measure visibility trends

Campaign-Level Metrics:

• ACoS by campaign type (branded, high-intent, discovery)
• Budget utilization rate
• Keyword performance distribution
• Search term waste percentage

Common Mistakes to Avoid

Mistake 1: Targeting Break-Even ACoS

Targeting your break-even point leaves no room for profit. Always build in a 20-30% buffer below break-even.

Mistake 2: Making Daily Bid Changes

Amazon’s algorithm needs 7-10 days to stabilize after bid changes. Daily adjustments create chaos and prevent meaningful data collection.

Mistake 3: Uniform Bid Reductions

Cutting all bids by 20% kills winners along with losers. Use performance-based bidding instead.

Mistake 4: Ignoring Listing Quality

No amount of campaign optimization can fix a listing that doesn’t convert. Optimize the destination before optimizing the traffic source.

Mistake 5: Insufficient Negative Keywords

Adding 5-10 negative keywords is insufficient. Successful sellers maintain 100+ negative keywords across their account.

Mistake 6: Pausing Campaigns Too Quickly

Keywords need 30+ clicks to generate statistically significant data. Pausing after 5-10 clicks wastes discovery opportunities.

Mistake 7: Forgetting About TACoS

A campaign with 40% ACoS might be highly profitable if it’s driving significant organic sales. Always evaluate TACoS alongside ACoS.

Final Thoughts

To optimise your ACoS (advertising cost of sale) on Amazon, you need to systematically apply proven strategies rather than just looking for quick fixes. 

The seven strategies outlined in this guide all work together to build an efficient and sustainable advertising process. 

You will learn how to calculate break-even targets, eliminate wasted search terms, structure campaigns correctly, optimise bids based on data, improve your listing’s average conversion rate, eliminate hidden expenses, and track your leading indicators.

The secret to achieving success is through consistent use of these methods over 90 days. 

Sellers who use these strategies in a structured manner usually see a 30-45% reduction in ACoS while maintaining or increasing their overall sales volume. 

Start with Strategy 1 and continue to follow through to the end of the guide and meticulously monitor your progress along the way. 

Your ACoS will not optimise itself; however, with the help of these proven strategies, you can achieve amazing results!

FAQs How to optimize Amazon ACoS

1. What is ACoS Amazon?

ACoS refers to Amazon’s Advertising Cost of Sales, calculated as ad spend ÷ ad-attributed sales × 100.

2. What is a good ACoS for Amazon PPC?

A good ACoS depends on your margins, but typically ranges between 20–30% for most categories. See our average ACoS benchmarks for how this varies by category.

3. How to improve ACoS on Amazon?

You can improve ACoS by optimizing your product listing, refining bidding strategies, tightening keyword targeting, and eliminating wasted spend.

4. How to calculate Amazon ACoS?

Divide your ad spend by the sales generated from ads, then multiply by 100 to get the percentage.

5. How to reduce ACoS on Amazon?

Reduce ACoS by improving conversion rates, using negative keywords, and optimizing campaigns for efficiency.

6. How to lower your Amazon ACoS?

Lower ACoS through bid adjustments, stronger creatives, better images, and continued negative keyword filtering.

7. How to decrease ACoS on Amazon?

Decrease ACoS by refining your campaign structure, focusing on profitable search terms, and improving listing relevance.

8. What is ACoS target report in Amazon?

The ACoS target report helps sellers understand their target ACoS levels and compare performance across keywords or ad groups.