We audit Amazon ad accounts every week, and the same problems come up again and again. Most aren’t exotic. They’re small, fixable habits that quietly drain margin month after month.
This guide is for brands that suspect their ads cost more than they should. For each mistake: how to spot it in your own account, what it costs, and the fix we make first.
The short version
- The most common and most expensive mistake is paying for search terms that never convert.
- Most of the rest are structural: winners never moved to their own campaigns, everything in one campaign, budgets that run out by noon.
- Several aren’t ad problems at all: a listing that can’t convert, a product in the wrong category, products with no ads.
- Judge the account on TACoS and profit, not ACoS alone.
The 12 mistakes
- Paying for Search Terms That Never Convert
- Winners That Never Get Their Own Campaign
- Catch-All Campaigns
- Budget in the Wrong Placement or Ad Type
- Everything Riding on Automatic Campaigns
- Advertising a Listing That Can’t Convert
- Budgets That Run Out by Noon
- Judging Ads on ACoS Alone
- Cutting Keywords Too Early
- Products With No Ads at All
- The Wrong Category
- Automation With Nobody Accountable
1. Paying for Search Terms That Never Convert
How to spot it: Download the search term report for the last 60 days. Sort by spend. Filter for orders = 0. Add up the spend.
What it costs: In one audit, 183 targets were taking 75% of the ad spend at an average ACoS of 68%. In another account, about $15K a month out of roughly $45K in total spend was going to searches that didn’t sell. After the cleanup, waste fell to $1,820 a month and ACoS dropped from 53% to 38%.
The fix: Add negatives for search terms that are clearly irrelevant, and for relevant ones that have had a fair chance (see mistake 9). Move the budget to searches that convert. A health brand we worked with grew profit from $70K/Month to $128K/Month by cutting wasted ad spend and letting the budget flow to search terms that performed. Read the case study
2. Winners That Never Get Their Own Campaign
How to spot it: In the search term report, find searches with three or more orders. Check whether each one is targeted as an exact-match keyword in its own campaign. In one audit, 51 converting search terms had never been moved.
What it costs: A winning search stuck inside a broad or automatic campaign shares a bid and budget with everything else. You can’t bid it up to win more, and you can’t protect its budget.
The fix: Move proven searches into exact-match campaigns with their own bids, and add them as negatives in the campaigns they came from. One brand rebuilt around exact-match “money keywords” in tightly segmented campaigns and cut TACoS from 27% to 14% in four months. Read the case study The full routine is in our Amazon PPC targeting guide.
3. Catch-All Campaigns
How to spot it: Open your campaigns and count the products in each. If one campaign advertises dozens of products, you have a catch-all.
What it costs: Your best sellers and your weakest products share one budget and one set of bids. The best sellers get starved, the weak ones waste money, and the reports can’t tell you which is which.
The fix: Split out your top products into their own campaigns. An apparel brand had more than 200 products lumped together. After we separated the top products, it hit its best month ever, $578K in revenue, at an ACoS just under 11%. Read the case study
4. Budget in the Wrong Placement or Ad Type
How to spot it: Run the placement report. Compare spend and ACoS for top of search, rest of search and product pages. Then compare Sponsored Products, Sponsored Brands and Sponsored Display.
What it costs: In one audit, product pages took the most spend with the weakest results, while top of search was underfunded. Sponsored Brands were twice as efficient, on a tenth of the budget.
The fix: Set placement adjustments from revenue per click, and move budget toward the ad types that convert. How we set placement bids is in our bidding and budget strategy.
5. Everything Riding on Automatic Campaigns
How to spot it: Check what share of total spend goes to automatic campaigns. If it’s most of it, this is you.
What it costs: Automatic campaigns are good at finding searches and poor at controlling them. In the audit behind mistake 1, heavy reliance on automatic campaigns was the root cause of the waste.
The fix: Keep automatic campaigns for discovery, on a modest budget. Move what they find into manual campaigns.
6. Advertising a Listing That Can’t Convert
How to spot it: Check the conversion rate on your ads. Across the 198 largest US accounts in Sophie Hub, the median ad conversion rate was 12.9% in September 2026. If yours is well below that on relevant searches, the listing is the problem, not the targeting.
What it costs: Every click costs the same whether the shopper buys or not. Half the conversion rate means each sale costs twice as much.
The fix: Fix the main image, title, price and reviews before raising bids. A kitchen products brand came to us with conversion under 3% and TACoS up to 95%. A new main image, better keywords in the title and a lean campaign structure took conversion to 8.7% and TACoS to 29%. Read the case study More in how to improve product visibility on Amazon.
Want us to check your account for all 12? We’ll look at your account and show you where the margin is going. You decide what to do with it. Get my free audit
7. Budgets That Run Out by Noon
How to spot it: In the campaign manager, look for campaigns marked “out of budget”, and check budget usage over the last two weeks.
What it costs: A campaign that runs out of budget is invisible until midnight. A supplements brand we took over had campaigns pausing for a few hours every day because of budget limits, which killed its momentum in the rankings. After fixing it, the brand grew 15x from $42K/Month. Read the case study
The fix: Raise budgets on profitable campaigns first. On campaigns that overspend, lower bids instead of capping budgets.
8. Judging Ads on ACoS Alone
How to spot it: Ask what the account is measured on. If the answer is only ACoS, this is you.
What it costs: A low ACoS can mean you’ve stopped reaching new customers. A rising ACoS can be the right move if it’s buying organic rank. Judging on ACoS alone gets both wrong.
The fix: Track TACoS (ad spend divided by total sales) and profit. A supplement brand switched its success metric from ACoS to TACoS, accepted short-term ACoS increases on its most valuable searches, and doubled revenue in four months. Read the case study A coffee brand shifted focus from ACoS to the P&L, and over six months TACoS fell from 31.7% to 15.9%. Read the case study Benchmarks and targets are in What Is a Good ACoS on Amazon?
9. Cutting Keywords Too Early
How to spot it: Check your negative keyword lists for relevant searches that were negated after only a few clicks.
What it costs: Searches that would have converted never get the chance. The same supplement brand above had a squeeze problem when we took it over: bad early negatives and exact-only targeting limited what it could reach.
The fix: Our rule is to wait until a search term has had 2.5 times the clicks your listing normally needs to make a sale. At a 12.9% conversion rate, that’s about 19 clicks without a sale before you negate.
10. Products With No Ads at All
How to spot it: Compare your list of active products against the products in your campaigns. In one audit, four listings with about $19,000 in combined sales had no campaigns at all.
What it costs: Those products only get organic sales, and competitors can advertise on their pages without any defense.
The fix: Give every product that sells at least a small campaign, and target your own product pages so your products fill the ad slots on them.
11. The Wrong Category
How to spot it: Check the category each product is listed in. Does it match what the product is, and the category your competitors use?
What it costs: The wrong category can mean higher fees and less relevant ads. A publisher of cruising guides and log books had its products in the wrong categories, and its fees were rising. Re-categorizing was the first step. Sales went from $2,700/Month to over $24,500/Month, and TACoS fell from about 21% to 12%. Read the case study
The fix: Check categories on every product, and open a case with Amazon to fix any that are wrong.
12. Automation With Nobody Accountable
How to spot it: Ask who approved the last ten bid or budget changes. If the answer is “the tool”, this is you.
What it costs: One account we reviewed had an AI tool that kept recommending budget increases. Nobody questioned them, and TACoS ended up over 200%. Another brand’s first PPC help built 40 campaigns in 15 days and spent its whole starting budget.
The fix: Automation needs a target from your margin, guardrails on how far it can move bids, and a person who reviews it weekly. More in the Amazon PPC tools we actually use.
How to Check Your Own Account in an Hour
- Search term report, last 60 days: total spend on terms with zero orders (mistakes 1 and 9).
- Search terms with 3+ orders: are they exact-match keywords in their own campaigns? (mistake 2)
- Campaign list: count products per campaign, and the share of spend on automatic campaigns (mistakes 3 and 5).
- Placement report: spend and ACoS by placement (mistake 4).
- Budget report: campaigns out of budget (mistake 7).
- Business report: ad conversion rate, TACoS, and products with sales but no ads (mistakes 6, 8 and 10).
Want us to check your account for all 12? We’ll look at your account and show you where the margin is going. You decide what to do with it. Get my free audit
FAQ
Usually one of three things: spend on search terms that don’t convert, a listing with a low conversion rate, or bids set without a target. Check the search term report first.
Compare TACoS with your margin. If ad spend as a share of total sales is above your margin, the account loses money overall. The fix usually starts with mistakes 1, 6 and 7.
In our audits, paying for search terms that never convert. It’s also usually the fastest to fix.
A light check every month, and a full review every quarter or whenever results change sharply.
Related Guides
- Amazon Seller Fees Explained: Every Fee and Your Real Margin
- Amazon PPC Match Types: Broad, Phrase, Exact and the 4th Type
- Amazon PPC Keyword Research: Grouping Keywords by Buyer Intent
- Amazon PPC Management Pricing: How Agencies Charge
Chris Rawlings is the founder of Sophie Society and an Amazon Ads Verified Partner. Sophie Society manages $5M/Month in Amazon ad spend and has worked with 800+ brands.
Data note: Sophie Hub figures cover the 198 largest US-marketplace accounts connected to Sophie Hub in September 2026, each spending $5K/Month or more on ads. These are accounts connected to the platform, not only accounts Sophie Society manages.
