High ACoS is the number one complaint we hear from Amazon sellers. You are spending money on ads, getting clicks, but the advertising cost of sale keeps climbing while profits shrink.
The problem is rarely that PPC does not work. The problem is how campaigns are structured, which keywords are targeted, and whether the listing behind the ads actually converts.
At EcomParagon, we have managed over $2M in Amazon ad spend across 50+ brands. This guide shares the exact framework we use to reduce ACoS for our clients, often by 30 to 50 percent within 90 days.
What Is ACoS and Why Does It Matter?
ACoS stands for Advertising Cost of Sale. It measures how much you spend on advertising for every dollar of ad revenue generated. The formula is simple: ad spend divided by ad revenue, multiplied by 100.
If you spend $20 on ads and generate $100 in ad revenue, your ACoS is 20 percent. A lower ACoS means your ads are more efficient and profitable.
Your target ACoS depends on your profit margins. If your product has a 30 percent profit margin before advertising, any ACoS below 30 percent means your ads are profitable. Above that, and you are losing money on every ad-driven sale.
ACoS vs TACoS: Know the Difference
Many sellers obsess over ACoS without looking at TACoS, which stands for Total Advertising Cost of Sale. TACoS measures your ad spend against your total revenue, not just ad revenue.
Here is why this matters. If your ACoS is 35 percent but your TACoS is only 12 percent, it means your PPC is driving organic sales. The ads are building keyword ranking that generates free organic traffic. In this case, a high ACoS is actually a sign that your PPC strategy is working.
We always track both metrics for our clients. ACoS tells you campaign efficiency. TACoS tells you overall advertising health.
7 Proven Strategies to Reduce Your ACoS
1. Audit and Expand Negative Keywords
This is the single fastest way to reduce ACoS. Go to your campaign manager, download the search term report for the last 60 days, and identify every search term that spent money without converting.
Any search term with significant spend and zero sales should be added as a negative keyword immediately. We typically find that 20 to 40 percent of ad spend goes to irrelevant search terms in unaudited accounts.
Do this weekly, not monthly. The longer you wait, the more money you waste on clicks that will never convert.
2. Restructure Your Campaign Architecture
Most sellers run a handful of auto campaigns and call it a day. A profitable PPC structure needs three layers:
- Auto campaigns for keyword discovery and research
- Manual broad and phrase match campaigns for testing and expansion
- Manual exact match campaigns for your proven, high-converting keywords
The auto campaign finds keywords. The broad and phrase campaigns test them. The exact match campaigns scale the winners. Each layer has a different purpose and budget allocation.
3. Harvest Converting Search Terms
Check your auto campaign search term report weekly. Any search term that has generated 2 or more sales should be moved to a manual exact match campaign with a dedicated bid.
This process is called keyword harvesting, and it is the foundation of profitable PPC. You are taking the keywords that Amazon has proven convert for your product and giving them focused attention and budget in exact match campaigns where you control the bid precisely.
4. Optimize Bids by Placement
Amazon lets you adjust bids by placement: top of search, product pages, and rest of search. In most cases, top of search placement converts significantly better than other placements.
Check your placement report. If top of search has a 15 percent conversion rate but product pages only convert at 3 percent, you should increase your top of search bid modifier and decrease product page bids. This shifts more of your spend toward placements that actually drive sales.
5. Fix Your Listing Before Scaling Ads
This is where most sellers make their biggest mistake. They try to fix ACoS by adjusting bids and budgets, but the real problem is the listing behind the ads.
If your listing has a 5 percent conversion rate, every click costs you more in wasted potential. If you improve that to 10 percent through better images, stronger bullet points, and optimized A+ Content, your ACoS drops in half without touching a single campaign setting.
We always audit the listing before adjusting PPC. A well-optimized listing makes every ad dollar work harder.
6. Use Dayparting Strategically
Not all hours of the day convert equally. If your product sells primarily to US customers, you may find that ads running between 2 AM and 6 AM EST generate clicks but very few sales.
While Amazon does not offer native dayparting, you can use third-party tools or manually adjust budgets during low-converting hours. Reducing spend during dead hours and reallocating that budget to peak conversion times can reduce ACoS by 5 to 15 percent.
7. Segment Brand and Non-Brand Keywords
Your branded keywords and non-branded keywords should never be in the same campaign. Brand keywords typically have very low ACoS because people searching your brand name already intend to buy.
When brand and non-brand keywords are mixed, the low brand ACoS masks the high non-brand ACoS, making it impossible to see which keywords are actually profitable. Separate them into different campaigns for clear performance visibility and accurate bid management.
What ACoS Should You Target?
There is no universal good ACoS. It depends entirely on your margins. Here is a simple framework:
- Break-even ACoS: Equal to your pre-advertising profit margin. At this point, you are not making or losing money on ads.
- Target ACoS: 5 to 10 percentage points below your break-even ACoS. This ensures every ad-driven sale is profitable.
- Launch ACoS: During product launches, accept a higher ACoS to build keyword rankings and review velocity. Reduce it gradually as organic sales grow.
For most products with 25 to 35 percent margins, a target ACoS of 15 to 25 percent is realistic and profitable.
How Long Does It Take to Reduce ACoS?
With aggressive optimization, most accounts see measurable ACoS improvement within 2 to 4 weeks. Significant reduction, typically 30 to 50 percent, takes 60 to 90 days of consistent optimization.
The timeline depends on how much waste exists in the current account. Accounts that have never been audited often see dramatic improvements in the first week simply from adding negative keywords.
Common Mistakes That Keep ACoS High
- Running only auto campaigns without harvesting keywords into manual campaigns
- Never adding negative keywords or only doing it once a quarter
- Setting bids and forgetting them instead of optimizing weekly
- Trying to reduce ACoS by cutting budget instead of improving efficiency
- Ignoring listing conversion rate as a factor in PPC performance
- Mixing branded and non-branded keywords in the same campaign
- Scaling ad spend before the listing is fully optimized
- Have a looks a exclusive services we provide across all marketplaces
Ready to Reduce Your ACoS?
Reducing ACoS is not about spending less on ads. It is about spending smarter. The right campaign structure, consistent keyword management, and a converting listing are what separate profitable PPC from money pits.
If your ACoS is eating into your margins, we can help. Book a free PPC audit with EcomParagon and we will show you exactly where your ad spend is being wasted and how to fix it.
