How to Lower ACoS on Amazon: 10 Strategies That Work in 2026

A 35% ACoS on a product with 30% margins means you are paying Amazon to take your inventory. That is not advertising. That is charity. Yet thousands of Amazon sellers sit at unprofitable ACoS levels month after month, tweaking bids one keyword at a time, hoping something changes.

The problem is not that lowering ACoS is complicated. The problem is that most sellers attack it from only one angle — usually bid reductions — when ACoS is actually a ratio driven by multiple levers.

Here is the formula every seller should memorize: ACoS = Ad Spend / Ad Revenue. That means you can lower ACoS by either reducing what you spend or increasing what you earn from that spend. The 10 strategies below cover both sides of the equation, organized from quickest wins to longer-term structural fixes.

What Is a Good ACoS on Amazon?

Before you start optimizing, you need a target. A "good" ACoS depends entirely on your product margins and business goals. Here is how to calculate your break-even ACoS:

Most established sellers target an ACoS 5–15 percentage points below break-even. Here are rough benchmarks by category:

• Low-competition niches (pet accessories, niche home goods): 10–20% ACoS
• Mid-competition niches (supplements, beauty, kitchen): 20–30% ACoS
• High-competition niches (electronics, phone cases, commodity goods): 25–40% ACoS

The right number for you is the one that lets you grow profitably. Now let's get your ACoS there.

1. Mine Your Search Term Reports for Negative Keywords

This is the single fastest way to lower ACoS. Most Amazon sellers waste 25–40% of their ad spend on search terms that will never convert. Pull your search term report from Seller Central. Filter for search terms with 15+ clicks and zero orders. These are your budget leaks.

Here is a real example: Marcus sells stainless steel water bottles. His auto campaign was triggering for "plastic water bottle cheap" — a term that generated 847 clicks over three months and exactly zero sales. That was roughly $340 in wasted ad spend. One negative keyword fixed it.

• Pull search term reports weekly (or automate the process)
• Flag any term with 20+ clicks and 0 conversions
• Flag any term with a spend higher than your product's sale price and 0 orders
• Add losers as negative exact match in the originating campaign
• Add irrelevant categories as negative phrase match (e.g., "plastic" for a stainless steel product)

This should be a weekly habit. If you are not doing it, your ACoS is higher than it needs to be. Period.

2. Fix Your Campaign Structure

Bad campaign structure is the hidden ACoS killer. When everything runs in one or two broad campaigns, you cannot control where your budget goes. The fix is segmentation. At minimum, you need:

• Brand campaigns (your brand name keywords): These should have the lowest ACoS — typically 5–10%
• Exact match campaigns (proven converting terms): Your bread and butter for predictable ACoS
• Research campaigns (broad/auto): Higher ACoS is expected here because you are discovering new terms
• Product targeting campaigns: Competitor ASINs and complementary products

When you separate campaigns by intent and match type, you can set different bids, budgets, and ACoS targets for each. Your overall blended ACoS drops because you stop funding research at the same level as your proven winners.

3. Lower Bids on High-Spend, Low-ROAS Keywords

Not every keyword deserves the same bid. The mistake most sellers make is going binary: keep or kill. Instead, use graduated bid adjustments:

• ACoS 2x+ your target: Cut bid by 30–40%
• ACoS 1.5x your target: Cut bid by 15–25%
• ACoS slightly above target: Cut bid by 5–10%
• ACoS at or below target: Maintain or increase bid to capture more volume

This is simple math, but it is tedious at scale. A seller with 50 campaigns might have 5,000+ keywords that need regular bid reviews. The key is not to slash bids too aggressively. Cut 30% at once and you might lose the auction entirely. Make incremental changes and review after 7–14 days of data.

4. Improve Your Product Listing to Boost Conversion Rate

This is the lever most PPC-focused sellers forget. ACoS is a ratio, and ad revenue is the denominator. If you improve your conversion rate from 10% to 15%, your ACoS drops by a third — without changing a single bid.

• Main image: Does it stand out in search results? A/B test through Manage Your Experiments
• Title: Front-loaded with the primary keyword and benefit? Under 200 characters?
• Bullet points: Do they address the top 3 buyer objections for your product?
• A+ Content: Are you using comparison charts and lifestyle imagery?
• Reviews: Are you at 4.0+ stars with 50+ reviews?
• Price: Are you competitive within your category?

Sarah runs a skincare brand and was stuck at 32% ACoS for months. Her PPC campaigns were well-structured, and her bids were reasonable. The issue was her listing. She switched to a lifestyle image showing the product in use, added a comparison chart in A+ Content, and her conversion rate jumped from 8.2% to 12.1%. Her ACoS dropped to 21% within three weeks. Same campaigns, same bids, same budget.

5. Use Placement Adjustments Strategically

Amazon offers bid multipliers for Top of Search and Product Pages placements. Most sellers either ignore these or crank them to 100% without data. Here is the right approach:

1. Run your Placement Report in Seller Central
2. Compare ACoS by placement: Top of Search vs. Rest of Search vs. Product Pages
3. Increase bids for placements that convert well, reduce for those that do not

A practical starting point: set Top of Search adjustment to 25–50% for your top 10 converting keywords. Leave Product Pages at 0% initially. Review after 2 weeks of data.

6. Implement Dayparting for Your Top Campaigns

Not every hour of the day converts equally. If your product sells primarily to US consumers, your conversion rate at 3 AM EST is almost certainly lower than at 8 PM EST. Yet your bids stay the same. Dayparting — adjusting bids or budgets based on time of day — can trim 5–15% from your ACoS.

This is one of those optimizations that is simple in theory but painful to execute manually. You would need to adjust bids twice a day, every day. Most sellers skip it. Those who automate it see consistent ACoS improvements.

7. Harvest Winning Search Terms Into Exact Match Campaigns

Your auto and broad match campaigns are research engines. They find search terms that convert. But if you leave those winners in broad campaigns forever, you pay more per click than necessary. The keyword harvesting loop:

1. Search term converts 2–3 times in auto/broad campaign
2. Add it as exact match keyword in your exact match campaign with a controlled bid
3. Add it as negative exact match in the originating auto/broad campaign
4. The exact match campaign now controls this keyword's bid precisely

Without harvesting, your auto campaigns keep bidding on proven terms at broad match CPCs — which are almost always higher than what you would pay in a dedicated exact match campaign.

8. Track TACoS, Not Just ACoS

Here is a scenario: you cut your ad spend by 50% and your ACoS drops from 30% to 20%. Win, right? Not necessarily. If your total sales also dropped by 40% because you lost organic rank, your Total Advertising Cost of Sale (TACoS) actually went up.

Track TACoS weekly alongside ACoS. If ACoS drops but TACoS stays flat or rises, you may have cut too deep. Aim for a TACoS that trends downward over time.

9. Audit Your Match Types and Adjust Bid Strategy

Many sellers set up campaigns with a mix of broad, phrase, and exact match keywords — all at the same bid. That is a problem. A common framework for bid ratios:

• Exact match bid: Your base bid (e.g., $1.00)
• Phrase match bid: 80–90% of exact ($0.80–$0.90)
• Broad match bid: 60–70% of exact ($0.60–$0.70)

This prevents broad match from consuming your budget at inflated CPCs. Review your campaign targeting strategy to make sure your match type distribution supports your ACoS goals.

10. Automate the Daily Grind

Every strategy in this article works. The challenge is doing all of them consistently. A seller managing $10K/month in ad spend might have 200+ campaigns and 10,000+ keywords. Doing all of this manually takes 10–15 hours per week.

Jake runs a home goods brand with $25K/month in ad spend. Before automating, he spent roughly 12 hours a week on PPC management and ran a 28% ACoS. After switching to automated management with a 20% ACoS target, his system ran all 10 strategies continuously. Within 6 weeks, his ACoS settled at 19.4% and his TACoS dropped from 11% to 8.3%. He did not become a better PPC manager. He stopped needing to be one.

Why Your ACoS Might Be High Right Now

Before implementing these strategies, diagnose the root cause. High ACoS usually stems from one or more of these issues:

• Poor negative keyword hygiene: Wasting spend on irrelevant search terms
• Flat campaign structure: No segmentation by match type, brand vs. non-brand
• Low conversion rate: The listing is not doing its job
• Overbidding: Paying more per click than the keyword's conversion rate justifies
• No harvesting: Leaving proven winners in expensive broad/auto campaigns
• Ignoring placements: Paying the same for low-converting placements as high-converting ones

Start Lowering Your ACoS Today

Lowering ACoS on Amazon is not a one-time fix. It is a system of ongoing optimizations — from negative keyword management and campaign structure to listing improvements and bid adjustments. The sellers who maintain profitable ACoS at scale are the ones who run these optimizations consistently.

If your current ACoS is not where it needs to be, start with strategy #1 (negative keywords) and #4 (listing audit). These two alone can drop your ACoS by 10–20% in the first month.