How to Lower Your Amazon ACOS in 30 Days(Real Strategy That Works)
If your Amazon ACOS keeps creeping up while your profit shrinks, you’re not alone. It’s the #1 complaint we hear from sellers and the good news is that high ACOS is almost never a problem with your product. It’s a problem with how your campaigns are built and managed.
This guide is a 30-day plan to bring your ACOS down and keep it down. No fluff, no “just lower your bids” guesswork. This is the same systematic process our team runs for clients every day.
What ACOS actually tells you (and what “good” means)
ACOS (Advertising Cost of Sale) = Ad Spend ÷ Ad Sales.
If you spend $50 on ads and generate $250 in sales, your ACOS is 20%.
But here’s the part most sellers skip: there is no single “good” ACOS. Your target depends entirely on your margin.
| If your product margin is… | Your target ACOS should be… |
|---|---|
| 50% | 25–30% |
| 35% | 15–20% |
| 25% | ~10% |
The rule is simple: if ACOS > your profit margin, you lose money on every sale. So the real goal isn’t “low ACOS.” It’s profitable ACOS and the 30-day plan below is built to get you there without killing your sales volume.
Week 1: Audit and clean your data
You can’t fix what you can’t see. Before touching a single bid, pull your numbers.
Step 1 : Run your Search Term Report
Go to Advertising → Campaign Manager → Reports → Sponsored Products → Search Term Report. Download the last 30–60 days. This report is your single most valuable PPC document it tells you exactly which searches triggered your ads.
Step 2 : Separate the winners from the losers
Create four buckets from your search terms:
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- Winners – high sales, low ACOS. These deserve more budget.
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- Opportunities – good sales, ACOS slightly above target. Optimize them (below).
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- Wasters – high spend, no sales, or ACOS through the roof. Kill or add as negatives.
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- Irrelevant – searches that have nothing to do with your product (e.g., someone searched for a competitor brand or the wrong size).
Pro tip: Look at at least 5-10 clicks before judging a term. A single lucky sale can make a bad keyword look great; a couple of unlucky clicks can hide a winner.
Step 3 : Find your “spend with no return” keywords
Filter the report for keywords with high spend and zero (or near-zero) sales. Circle every one. These are your ACOS killers and the first thing you’ll fix.
Week 2: Fix the leaks (negatives + bids)
Step 4 : Add negative keywords ruthlessly
Every “waster” and “irrelevant” term from Week 1 should become a negative keyword.
Add them at the campaign level (if they only hurt that campaign) or the ad group level (if they’re product-specific). The most common mistake we see: sellers add negatives only at one level and the wasted spend just moves to another campaign.
Three levels of negatives to set up:
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- Negative exact for true waste words (e.g. your own product when you don’t need to buy it, competitor names you don’t want).
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- Negative phrase for waste word combos.
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- Negative keywords on auto campaigns these are where most junk spend happens.
You’ll often find ACOS drops 5–15 points in the first week just from cleaning negatives, before you change a single bid.
Step 5 : Set bids by what the data says
Now adjust bids, not on feelings, but on the report:
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- Winner keywords: raise bids slightly (10–20%) to win more of that traffic.
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- Opportunity keywords: lower bids 10–15% to bring ACOS toward target.
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- Wasters you don’t negate: pause the ad group or kill the keyword.
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- Use dynamic bidding (down only) on campaigns where you want to control spend tightly.
Week 3: Harvest and scale what works
Step 6 : Harvest winners into exact-match campaigns
This is the highest-leverage move in all of Amazon PPC.
Take your winner keywords and move them out of broad/auto campaigns into a dedicated manual exact-match campaign. Exact match gives you the most control and typically the best ACOS because you’re only paying for precisely relevant searches.
Structure it cleanly:
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- One campaign per product, or one per product family.
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- A “harvest” campaign holding only your proven exact keywords.
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- Higher bids here, because this is your money maker.
Step 7 : Build a solid campaign structure
A common reason ACOS stays high: everything dumped into one giant auto campaign. A clean account looks more like this:
textSponsored Products
├── Auto (discovery)
├── Manual — Broad / Phrase (research & expansion)
├── Manual — Exact / Harvest (winners, higher bid)
├── Sponsored Brands (defend your brand)
└── Sponsored Display (retarget browsers & win back carts)
The point of structure is control. Each campaign has a clear job, so you know exactly where every dollar goes and what it does.
Week 4: Placements, timing, and review
Step 8 : Check your placement modifiers
Check Placement reports. On Amazon, the top of search placement often converts far better — but it also costs more. If “Top of Search” has a great conversion rate, increasing its bid multiplier (e.g. +20–40%) can actually lower your overall ACOS by winning the sales that were leaking to slower placements.
Test placements for 7 days, read the data, keep what wins.
Step 9 : Try dayparting if you’re on a tight budget
Look at the time-of-day breakdown in your reports. If your category converts mostly in the evening, you can use bid scheduling / dayparting tools to spend more in peak hours and reduce waste in dead hours. (Not all sellers need this only bother if your budget is capped and you’re leaving sales on the table.)
Step 10 : Review the full month and set your cadence
At day 30, compare:
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- ACOS before vs. after
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- Spend wasted on negatives before vs. after
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- Profitable sales volume (did you keep or grow it?)
Then set a weekly maintenance habit: 15 minutes a week to check the search term report, add new negatives, harvest new winners, and confirm nothing drifted. PPC is not “set and forget” campaigns decay as competition and seasonality shift.
When to manage it yourself vs. hand it to a team
You can absolutely run this playbook yourself. If you have the time and a small, stable catalog, do it.
But if you’re juggling sourcing, listings, and inventory or if your account has a large catalog and heavy ad spend campaign management becomes a full-time job. That’s exactly why sellers hire a dedicated PPC team: to run this process every single week, month after month, so ACOS stays low while you run the business.
Bottom line
Lowering ACOS isn’t about a single magic fix. It’s a repeatable 30-day system:
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- Audit your search term report.
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- Negate the waste and fix the bids.
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- Harvest winners into exact-match.
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- Review placements and make it a weekly habit.
Do that consistently, and profitable ACOS isn’t luck it’s a process.
Want us to run this system for you? Get a free audit of your current campaigns and we’ll show you exactly where your ad budget is leaking — and how much you could save. No obligation.
