High ACOS (Advertising Cost of Sale) is the #1 complaint among Amazon sellers running PPC. The instinct is to slash bids — which usually just kills sales along with spend. The real fix is structural: most high-ACOS accounts aren’t spending too much, they’re spending it in the wrong places. Here’s how to bring ACOS down while protecting (and growing) revenue.
1. Restructure Campaigns by Intent
The most common structural mistake: one auto campaign catching everything. Branded searches (your brand name), competitor terms, and broad category terms have wildly different conversion rates — lumping them together means your best keywords subsidize your worst.
- Separate campaigns by intent: one for branded terms, one for competitor conquesting, one for generic category keywords. Each gets its own budget and bid strategy.
- Split by match type. Exact, phrase, and broad belong in separate campaigns or at minimum separate ad groups, so you can bid each according to its precision.
- Isolate your winners. When a keyword proves itself in a research campaign, graduate it to a dedicated exact-match campaign where you control its budget and bids precisely.
- Give testing its own budget. Auto and broad campaigns are for discovery — cap their spend so they can’t drain the budget your proven keywords need.
2. Mine Search Term Reports Religiously
Amazon hands you a list of exactly what shoppers typed before clicking and buying. Sellers who ignore this report are flying blind; sellers who mine it weekly compound their advantage.
- Download search term reports every 7 days. Sort by orders, then by spend with zero orders.
- Promote converters. Any search term with 2+ orders gets added as an exact-match keyword in your manual campaigns with a competitive bid.
- Kill the bleeders. Any term with significant spend and zero orders gets added as a negative exact keyword immediately.
- Watch for surprises. You’ll regularly find converting terms you never would have targeted — misspellings, use cases you didn’t consider, competitor-adjacent phrases. These are often your cheapest wins.
3. Use Negative Keywords Aggressively
Negative keywords are the highest-ROI activity in Amazon PPC, and the most neglected. Every irrelevant click you block is money redirected to clicks that convert.
- Add negative ASINs too. If your product keeps showing on a competitor’s listing where it can’t win, negate that ASIN.
- Build a shared negative list. Terms like “free,” “used,” “repair,” “manual,” or wrong-size variants waste spend across every campaign. Maintain one master list and apply it everywhere.
- Use negative phrase match for families of junk. One negative phrase can block dozens of irrelevant variations.
- Review weekly. New junk terms appear constantly as Amazon expands matching. A monthly review isn’t enough in competitive categories.
4. Bid With a Strategy, Not a Guess
Random bid adjustments — up 10% here, down 20% there — produce random results. Replace guessing with rules:
- Set target ACOS per campaign. Your branded campaign might target 10% ACOS; a product-launch campaign might accept 60%. One account-wide target guarantees mediocrity everywhere.
- Adjust bids based on placement data. Check where your spend goes: top of search, rest of search, product pages. Shift budget toward the placements that convert for each campaign.
- Raise bids on proven keywords before cutting losers. Most sellers cut spend first. Often the bigger win is giving your best keywords more budget — they convert, so more spend at the same ACOS means more profit.
- Lower bids gradually. Drop bids 10–15% at a time and wait 3–4 days between changes. Drastic cuts tank your ranking and take weeks to recover.
5. Protect Profitability at the Product Level
ACOS is a campaign metric, but profit is a product metric. A 30% ACOS is fine on a high-margin product and fatal on a thin-margin one.
- Know your break-even ACOS. It’s your profit margin before ad spend. If your margin is 40%, any ACOS under 40% is profitable — don’t panic at 35%.
- Segment by margin. Give high-margin products aggressive PPC budgets; be conservative with low-margin ones, or fix the margin first (price, costs, bundle).
- Track TACOS (Total ACOS). Ad spend divided by total revenue, not just ad-attributed revenue. PPC also lifts organic rank — TACOS shows whether your total business is getting more efficient even when campaign ACOS looks flat.
- Don’t optimize ACOS in isolation. An account at 20% ACOS with flat sales is losing to an account at 35% ACOS that’s doubling. Growth with controlled ACOS beats stagnation with perfect ACOS.
When to Bring In Professionals
These five disciplines — structure, search term mining, negatives, bid strategy, and margin awareness — will fix most ACOS problems. But they also take hours every week to maintain, and Amazon changes the rules constantly. If PPC is eating your time or your ACOS won’t budge despite doing everything right, that’s when professional management pays for itself.
Liazon Marketing offers dedicated Amazon management — full-service PPC and listing management handled by specialists, so your campaigns are optimized continuously while you run your business.
And if you want to see exactly what’s wrong first, start with the data: our Amazon Audit uses AI to analyze your actual listing and ad setup, identifies the top 5 issues costing you the most revenue, and delivers specific fixes to your inbox in under 5 minutes.
Get your Amazon AI Audit — $69
📞 (954) 864-9161 · 📧 liza@liazonmarketing.com · 🌐 liazonmarketing.com
