How to Improve ACOS on Amazon: Step-by-Step Guide (2026)

Key Takeaways

• ACOS improvement starts with data audits—identify high-spend, low-conversion keywords and placements draining your budget without returns

• Match type refinement and negative keywords are the fastest levers to cut waste; prioritize exact and phrase matches over broad

• Bid adjustments must follow conversion data, not gut instinct—lower bids on high-ACOS terms, raise them on profitable converters

• AI business analysts accelerate optimization by connecting to live Amazon Ads APIs, surfacing actionable insights without manual CSV exports

• Continuous monitoring beats one-time fixes—schedule weekly reviews and automate anomaly detection to maintain optimal ACOS over time

To improve ACOS on Amazon, audit underperforming keywords and cut wasteful spend, refine match types to prioritize exact and phrase matches, adjust bids based on conversion data, and use negative keywords aggressively. AI business analysts accelerate this by connecting directly to live Amazon Ads data, surfacing anomalies and high-ACOS culprits instantly without manual spreadsheet work.

Understanding ACOS and Why It Matters

ACOS (Advertising Cost of Sale) measures how much you spend on ads to generate one dollar of ad-attributed sales. The formula is simple: divide your ad spend by ad sales, then multiply by 100.

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If you spent $30 to generate $100 in sales, your ACOS is 30%. Why does ACOS matter? Because it directly impacts profitability.

If your product has a 40% profit margin and your ACOS sits at 35%, you're only netting 5% after advertising costs. Push ACOS to 45% and you're losing money on every sale driven by ads.

Industry benchmark: The average Amazon ACOS across all categories hovers between 25-35%, but profitable sellers typically target 15-25% to preserve healthy margins.

Unlike ROAS (Return on Ad Spend), which flips the ratio to show revenue per ad dollar, ACOS keeps the focus on cost efficiency. Lower ACOS means you're spending less to achieve the same sales—the core goal of any optimization effort. For more on how TrackIQ connects AI directly to your advertising data, visit how TrackIQ works.

Step 1: Audit Your Current Campaign Performance

Start by pulling a 30-day snapshot of all active campaigns, ad groups, and keywords. You need three key metrics for each: spend, sales, and ACOS. Export this from Amazon Advertising or use an Amazon Ads API connection for real-time data.

Sort by ACOS descending. The top of your list will reveal the biggest offenders—keywords or campaigns burning budget with minimal return.

Look for:

• High-spend, high-ACOS keywords: terms that consume significant budget (often $50+ per week) but deliver ACOS above 40-50%

• Zero-conversion spenders: keywords with impressions and clicks but no sales, indicating poor relevance or targeting

• Placement imbalances: top-of-search placements often cost more per click; if they're not converting proportionally, they inflate ACOS

Next, identify your winners. Filter for keywords with ACOS under 20% and meaningful spend (at least $20/week). These are your profit drivers—you'll want to scale them intelligently.

Using AI to Accelerate the Audit

Manual audits mean downloading CSVs, pivot tables, and hours of spreadsheet work. An AI business analyst like TrackIQ connects directly to Amazon Seller Central and Ads APIs via Model Context Protocol (MCP), letting you ask natural-language questions.

"Which keywords have ACOS above 40% and spent more than $100 this month?" The AI surfaces answers in seconds, not hours.

Step 2: Refine Keyword Match Types and Targeting

Broad match keywords are the most common ACOS culprits. They cast a wide net, triggering ads for loosely related searches that rarely convert.

[[TQ_IMG:https://framerusercontent.com/images/ymMP5eAYWjDSYXKCv3hLPlLGz4.png|Step 1: Audit Your Current Campaign Performance]]

If you're running broad match on "wireless headphones," you might appear for "cheap headphones," "wired headphones," or "headphone case"—all irrelevant traffic that drains budget.

To improve ACOS, shift budget from broad to phrase and exact match. Run broad match campaigns only for keyword discovery with tight daily budgets ($5-10), then harvest high-performing search terms and promote them to exact match campaigns with higher bids.

Audit Automatic vs. Manual Campaigns

Automatic campaigns use Amazon's algorithm to target keywords and products. They're useful for uncovering new search terms, but they often trigger for low-intent queries.

Review your automatic campaign search term reports monthly, add high-performers as exact match keywords in manual campaigns, and add irrelevant terms to your negative keyword list.

Step 3: Build a Robust Negative Keyword Strategy

Negative keywords prevent your ads from showing for irrelevant searches, cutting wasted clicks instantly. If you sell premium coffee beans and keep getting clicks for "free coffee samples" or "cheapest coffee," those searches will never convert at your price point. Add them as negatives.

Download your search term report from Amazon Seller Central for the past 60 days.

Filter for terms with:

• Clicks but zero orders

• ACOS above 60%

• Obvious irrelevance (competitor brand names, wrong product type, "how to" queries)

Add these as campaign-level or ad-group-level negative exact or negative phrase matches. Negative exact blocks only that specific query; negative phrase blocks any search containing that phrase in order.

Pro tip: Create a master negative keyword list and apply it across all campaigns to prevent repeat waste. Update it monthly as new irrelevant terms emerge.

AI-Powered Negative Keyword Discovery

Instead of manually scanning thousands of search terms, an AI business analyst can parse your search term reports in seconds, flagging irrelevant queries and suggesting negative additions based on historical conversion patterns and semantic similarity to known non-converters.

Step 4: Optimize Bids Based on Performance Data

Bidding should be data-driven, not arbitrary. Too many sellers set bids once and never revisit them. Effective ACOS optimization requires continuous bid adjustments based on keyword performance.

For high-ACOS keywords (above your target threshold):

• Lower bids by 15-25% if they're still generating some conversions—this tests whether lower traffic at reduced cost improves efficiency

• Pause entirely if they've spent $50+ with zero conversions or ACOS above 80%

For low-ACOS winners (below 20%):

• Raise bids by 10-20% to capture more impression share and scale profitably

• Ensure adequate budget—if your daily budget caps out early, you're leaving profitable sales on the table

Dayparting and Placement Bid Adjustments

Not all hours or placements convert equally. Review your campaign placement report to see how top-of-search, rest-of-search, and product pages perform.

If top-of-search has 50% higher ACOS than rest-of-search, reduce your top-of-search bid adjustment from +50% to +20% or even 0%. Similarly, if your sales concentrate between 6 PM and 11 PM, consider using bid rules (via Amazon's API or third-party tools) to increase bids during peak hours and lower them overnight.

Step 5: Leverage Product Targeting and Sponsored Display

Keyword targeting isn't the only lever. Product targeting in Sponsored Products and Sponsored Display campaigns can yield lower ACOS by showing your ads on competitor listings or complementary products with proven buyer intent.

[[TQ_IMG:https://framerusercontent.com/images/KYCiuRjvWVlpaBvS79aCyuQenk.png|Step 3: Build a Robust Negative Keyword Strategy]]

Launch product-targeted campaigns focused on:

• Competitor ASINs with high review counts and similar price points—buyers viewing these are in-market and comparison shopping

• Your own catalog (cross-sell opportunities)—advertise related items on your product detail pages to increase average order value

• Category targeting with tight refinements (brand, price range, star rating) to avoid broad, low-intent placements

Monitor ACOS by product target just as rigorously as keywords. Pause underperformers and scale winners with bid increases and budget allocation.

Step 6: Analyze Search Term Performance Weekly

ACOS optimization is not a one-time project—it's a weekly discipline. Set a recurring calendar block every Monday or Friday to review new search terms, ACOS shifts, budget caps, and conversion rate changes.

Review these metrics weekly:

• New search terms that triggered ads in the past 7 days

• Keywords with ACOS shifts greater than 10 percentage points week-over-week

• Campaigns approaching budget caps prematurely

• Conversion rate drops that signal listing issues (images, pricing, out-of-stock)

Export your search term report, sort by impressions and ACOS, and apply the same audit logic from Step 1. Promote high-performers to exact match, add irrelevant terms to negatives, and adjust bids on movers.

Automate Anomaly Detection with AI

Manually tracking dozens of campaigns and thousands of keywords is tedious and error-prone. AI business analysts can monitor your accounts continuously, alerting you to ACOS spikes, budget pacing issues, or sudden conversion rate drops.

Instead of discovering a problem a week late, you're notified within hours and can course-correct immediately.

Step 7: Align ACOS Goals with Business Objectives

Not all campaigns should target the same ACOS. Your optimization strategy must reflect product lifecycle stage and business goals.

Set explicit ACOS targets at the campaign level based on these goals. Review and adjust quarterly as products mature or market conditions shift.

Step 8: Optimize Your Product Listing for Higher Conversion

ACOS optimization isn't just about ad settings—your product detail page directly impacts conversion rate. If your listing has weak images, unclear bullet points, or a 3-star rating, even perfectly targeted ads will yield high ACOS because clicks don't convert.

Audit your top-spending ASINs for:

• Conversion rate below category average (check Business Reports in Seller Central)—this signals listing issues, not targeting problems

• High click-through rate but low conversion—your ad copy or targeting is misleading; adjust keyword relevance or ad creative

• Pricing competitiveness—if you're 20% above competitors, lower bids or accept higher ACOS as a trade-off

Improving your listing's conversion rate by even 1-2 percentage points can drop ACOS by 10-15% without touching ad settings.

Test enhanced images, A+ Content, and revised bullet points systematically to boost conversion performance.

Step 9: Use Portfolio-Level Budget Management

Campaign-by-campaign optimization can miss forest-for-the-trees inefficiencies. Group related campaigns into portfolios (brand defense, competitor conquesting, long-tail keywords) and set portfolio-level budgets and ACOS targets.

This allows high-ACOS campaigns within a portfolio to be balanced by low-ACOS winners, smoothing overall performance.

Review portfolio-level metrics monthly:

• Total spend vs. sales across the portfolio

• Blended ACOS (portfolio ad spend ÷ portfolio ad sales)

• Budget utilization (are you capping out daily or leaving budget unused?)

Reallocate budget from underperforming portfolios to top performers. If your brand defense portfolio consistently hits 15% ACOS while your long-tail exploration sits at 45%, shift budget allocation to maximize profitable growth.

[[TQ_SOURCES]]Amazon Advertising | https://advertising.amazon.com; Amazon Seller Central | https://sellercentral.amazon.com; Amazon Ads Learning Console | https://advertising.amazon.com/resources