How to Optimise Amazon PPC Campaigns and Reduce ACoS for Maximum ROI

Rising ACoS usually isn't a single problem — it's the accumulated effect of several small inefficiencies: broad match campaigns bleeding budget, bids that were never revisited after launch, and keyword targeting that hasn't kept pace with actual conversion data.

Here are practical, actionable tactics for optimising your Amazon PPC campaigns and reducing ACoS, covering campaign structure, keyword strategy, and ongoing bid management.

• Separate exact, phrase, and broad match into distinct campaigns rather than mixing them, giving you cleaner performance data and precise bid control for each

2. Harvest High-Converting Search Terms

• Review search term reports from broad and phrase match campaigns regularly
• Promote consistently converting search terms into their own dedicated exact match campaigns for tighter control and lower ACoS

3. Build and Maintain a Negative Keyword List Continuously

• Identify search terms generating clicks but no conversions from your search term reports
• Add them as negative keywords regularly, not just once at campaign launch

4. Adjust Bids Based on Actual Performance Data

• Increase bids on keywords converting well below your target ACoS
• Decrease or pause bids on keywords consistently exceeding your breakeven ACoS with no signs of improvement

5. Use Dayparting Where the Data Supports It

• If certain hours or days show consistently better conversion rates, consider adjusting bids accordingly rather than treating all times equally

6. Fix the Listing Before Blaming the Campaign

• High ACoS is sometimes a listing conversion problem, not a targeting problem — review click-through rate and conversion rate separately to diagnose correctly
• A weak listing wastes efficient ad spend regardless of how well-targeted the campaign is

7. Leverage Sponsored Brands and Display Alongside Sponsored Products

• Relying solely on Sponsored Products limits your visibility and retargeting opportunities
• Sponsored Brands can build broader visibility, while Sponsored Display can retarget shoppers who viewed but didn't purchase

8. Set and Track Against a Calculated Breakeven ACoS

• Calculate your breakeven ACoS based on actual product margin, rather than chasing a generic "good" ACoS number
• Set campaign targets relative to your specific breakeven point

9. Review Performance at the Keyword Level, Not Just Account-Wide

• Account-wide ACoS can mask individual keywords or campaigns quietly losing money while others compensate

10. Reassess Regularly, Not Just Once

• Search trends, competition, and seasonality shift constantly — a campaign structure that worked well three months ago may need adjustment now

How These Tactics Work Together

• Better campaign structure (tactic 1) makes search term harvesting (tactic 2) and negative keywords (tactic 3) more effective
• Accurate keyword-level data (tactic 9) is what makes informed bid adjustments (tactic 4) possible in the first place
• Fixing the listing (tactic 6) improves the ROI of every other optimization made to the campaigns themselves

Realistic Expectations for Improvement

• Timeline: Meaningful ACoS improvement typically takes 60-90 days of consistent, active management
• Magnitude: A 10-20% ACoS reduction is a realistic target for accounts that were previously unmanaged or under-optimized

Getting Started

PPC Optimization Audit (Week 1)

1. Review your current campaign structure, ACoS by keyword, and search term reports
2. Identify the highest-impact quick wins from the tactics above
3. Build a prioritized optimization plan

Conclusion

Reducing ACoS rarely comes from one dramatic change — it's the cumulative effect of better campaign structure, disciplined negative keyword management, and data-driven bid adjustments applied consistently over time. Working through these tactics systematically tends to deliver meaningful, sustainable improvement.

Want your PPC campaigns audited and optimised? Contact us for a free PPC audit.

Key Takeaways

• Restructure Amazon PPC campaigns by match type for better control and performance analysis.
• Continuously harvest high-converting search terms to refine and scale your successful advertising campaigns.
• Maintain an aggressive negative keyword list to prevent wasteful spending on irrelevant search terms.
• Always optimize your product listing content before adjusting bids to improve conversion rates effectively.
• Calculate your breakeven ACoS to set realistic profit targets and guide all bidding decisions.

FAQ

What is the most effective way to reduce my Amazon ACoS?

The most effective way is to perform a deep-dive audit of your search term reports. Eliminate wasted spend by adding non-converting queries to your negative keyword list, while simultaneously increasing bids on high-converting keywords that directly contribute to sales and help maintain your desired profit margins.

How often should I review my Amazon PPC campaign performance?

You should perform a comprehensive review of your campaigns at least weekly. Regular monitoring allows you to identify trends, react to shifting market conditions, and make data-driven adjustments to your bids. Consistent maintenance prevents budget bleeding and ensures that your advertising strategy remains aligned with your overall business profitability goals.

Should I fix my product listing before optimizing PPC campaigns?

Yes, absolutely. If your listing has low-quality images, poor descriptions, or weak reviews, no amount of PPC optimization can fix a low conversion rate. Ensure your listing is fully optimized to convert traffic into sales; otherwise, you will continue to waste your advertising budget on unproductive, high-bounce traffic.

What is a breakeven ACoS and why is it important?

A breakeven ACoS is the point where your advertising spend exactly equals your profit margin, resulting in neither a gain nor a loss. It is essential because it serves as your performance baseline. Keeping your ACoS below this threshold ensures every sale driven by advertising generates a net profit.