5 Google Ads Mistakes That Cost You Money

I have audited enough Google Ads accounts to know that most wasted spend is not caused by exotic tactics. It is caused by defaults nobody changed and reports nobody read.

That is the frustrating part for an account owner, because it means the losses are avoidable. Nothing about the five mistakes below requires cleverness to fix. They require someone to open the account, look at the settings properly, and make a decision.

Thirteen years of doing this work has taught me that accounts rarely fail loudly. They leak. Below are the five faults I find most often in Australian accounts, what Google's own documentation says about each one, and the specific fix.

Why Most Ad Spend Leaks Rather Than Vanishes

Defaults you never changed

When you create a campaign, Google pre-selects settings for you. Those defaults are not malicious, but they are built to maximise delivery across the whole system rather than to protect a small local advertiser's budget.

Every default is a decision someone made on your behalf. Match type, location targeting, network selection, automated bidding and audience expansion all arrive with a recommendation attached. On a new account nobody has changed them yet.

Reports you never opened

The second cause is simpler. The report that tells you which actual queries triggered your ads is not the first screen you are shown, and it is not in the monthly summary email.

Spend leaks into searches you would never have chosen. The only way you find out is by reading the report and doing something about what you find.

Mistake 1: Broad Match With No Negative Keywords

Broad match is the default match type

This is the mistake that generates the most waste, and it is built into the account from day one. As Google Ads Help explains, "Broad match is the default match type that all your keywords are assigned because it is the most comprehensive."

Comprehensive is a generous word for it. Broad match will show your ad on searches that are related to your keyword in ways the system considers relevant, and it does not ask you first. A local plumber bidding on emergency plumbing can appear for searches about plumbing courses, plumbing supplies and how to fix a tap yourself.

None of that is a malfunction. It is the feature working as described. The problem is that nobody added a counterweight.

How to build a negative keyword list from your search terms

The counterweight is a negative keyword list, and Google explains the mechanic clearly. As Google Ads Help states, "Negative keywords let you exclude search terms from your campaigns and help you focus on only the keywords that matter to your customers."

Build the list from evidence rather than from imagination. Open the search terms report, sort by cost, and read the queries you actually paid for. Every query that could never become a customer goes on the list. Add negatives at the account level for universal exclusions such as job seekers, free seekers and competitor brand terms you do not want to bid on.

What to review and when

Review the list monthly once the account is stable. Review it weekly for the first month of a new campaign, or any time you change match types, because both events change which searches you are eligible for.

Negative keywords are not a one-off setup task. They are a habit, and the habit is what keeps broad match honest.

Mistake 2: No Confirmed Conversion Tracking

Why import and processing delays matter

The second mistake is judging performance before the data has arrived. Conversion measurement does not report instantly, and Google publishes the delay plainly. As Google Ads Help notes, "After linking accounts or marking an event as key events, it can take 24 to 48 hours for the system to propagate before the import options appear in Google Ads."

That delay matters because it feeds a specific bad decision. An owner launches a campaign, sees no conversions in the first day, panics, changes the bids and the budget, and then judges the new settings on data that was still in transit.

What to check before you judge performance

Confirm three things before you interpret a single number. That the conversion action fires on the thank you page or the confirmation event exactly once. That the recorded count reconciles with the enquiries you actually received. And that the count has had time to land.

If you cannot confirm the first two, you are not optimising, you are guessing with extra steps. That is a measurement job before it is an advertising job, and it is the same work as conversion tracking setup done properly.

Mistake 3: Location Targeting Left on Default

Presence, interest and best effort accuracy

Location targeting sounds like a boundary. It is closer to a preference. Google is explicit that the system is approximate. As Google Ads Help puts it, "Because these signals vary, 100% accuracy is not guaranteed in every situation."

Within a location setting you also choose whether to target people physically in the area, people showing interest in it, or both. The default is broader than most local businesses expect, which means you can pay for clicks from someone researching your city from interstate or overseas.

Why local businesses overpay for out of area clicks

For a service business with a defined radius, an out of area click is close to pure loss. The person cannot buy from you, but you paid for the click regardless, and the click also distorts your conversion rate downward, which in turn affects how the system bids for you.

Check the location setting on every campaign. Decide deliberately whether you want presence or interest. If you serve a radius, target the radius rather than the metro area around it.

Mistake 4: Ignoring the Three Quality Score Components

Expected clickthrough rate, ad relevance and landing page experience

Quality Score breaks into three diagnostics: expected clickthrough rate, ad relevance and landing page experience. Each one can be read as above average, average or below average, and that comparison is not made against a fixed standard. As Google Ads Help explains, "This evaluation is based on a comparison with other advertisers whose ads showed for the exact same search over the last 90 days."

Read as a diagnostic, the three components are genuinely useful. A below average expected clickthrough rate suggests your ad is not matching the query. A below average landing page experience suggests the page does not deliver what the ad promised.

What Quality Score does and does not do in the auction

Here is where most advice gets it wrong, and Google's own documentation is the correction. As Google Ads Help states, "Quality Score is not an input in the ad auction."

It is not a number to chase and it is not a key performance indicator. Aggregate it across an account and it tells you nothing, because it was never designed to be averaged. Treat it as a pointer to a component that needs attention, then fix the underlying problem, which is usually the ad copy or the landing page.

Mistake 5: Never Reading the Search Terms Report

Turning real queries into negatives

The search terms report shows the actual queries that triggered your ads. It is the only place where guesswork meets reality, and Google describes the action it enables in the same breath. As Google Ads Help states, "By adding irrelevant search terms as negative keywords, you can prevent your ad from showing to people who are looking for something you don't sell."

Read the report with two outcomes in mind. Queries that are wrong become negatives. Queries that are right but under-served become new keywords or new ad groups, because a search you handle badly is a competitor's opportunity.

Where to run this review each month

Run it at the campaign level, sorted by cost descending, and stop reading once the spend gets small. The first page of results is where the money is. Ten minutes is enough once you know what you are looking at, and it is the highest return ten minutes in the whole account.

The Fix Order That Saves the Most Money First

Tracking, then search terms, then match types, then structure

Fix tracking first, because every later decision depends on it. Then the search terms report, because that is where the obvious waste is visible and cheapest to remove. Then match types, once you can see which queries you are actually pulling. Structure and bidding come last, because restructuring an account that is reporting garbage just moves the garbage around.

Working in that order means each step is built on a verified signal. Working out of order is how accounts get rebuilt two or three times without anyone resolving the original problem.

What to Check Monthly in Under an Hour

A simple review routine for a busy owner

Fifteen minutes on the search terms report, adding negatives and noting new keyword ideas. Ten minutes on location and device settings, confirming nothing drifted. Ten minutes comparing spend to conversions for the month and reconciling against real enquiries. Fifteen minutes on the three Quality Score components, only to spot anything that has gone below average. Ten minutes on budget pacing, so nothing spends at double rate in the final week.

That is an hour a month for a small account. If you cannot protect an hour a month, the honest options are to stop running ads or to hand the account to someone who will, because an unread account is an expensive way to buy nothing.

When an Outside Audit Is Worth Paying For

Accounts with history, staff changes or sudden cost increases

Three situations justify an outside read. An account with history that nobody currently working there built, because documented reasoning beats reverse engineering. A change in who manages the account, because the handover is where settings go unexamined. And a sudden increase in cost per lead without a matching change in the market.

An audit is also the cheapest way to find out whether you should keep managing the account yourself. It answers whether the five problems above are present, which tells you how much discipline the account actually needs. You can see how that works on Google Ads audit, and if the findings point to ongoing management rather than a one-off fix, that sits under Google Ads management instead.

Google Ads FAQ

Why is my Google Ads spend going up without more leads?

The two usual suspects are match types and location settings. Broad match is the default and will serve on related searches you never chose, and location targeting is a best-effort system rather than a precise boundary. Both can be fixed with a negative keyword list and a tightened location setting, but you need conversion tracking working first or you are guessing.

What is the single most expensive Google Ads mistake?

Running campaigns without confirmed conversion data. Everything else in the account, including bidding, budget and match types, is being optimised against a signal you have not verified. Until tracking records real enquiries, you cannot tell a good campaign from a lucky one.

How often should I review the search terms report?

Monthly for most accounts, weekly during the first month of a new campaign or when you change match types. The report only shows terms with enough activity, so small accounts need to look a little less often and expect a smaller list.

Do I need to fix Quality Score?

Not as a number to chase. Google's own documentation says Quality Score is not a key performance indicator, should not be aggregated with your other data, and is not an input in the auction. It is a diagnostic: use it to find where expected clickthrough rate, ad relevance or landing page experience is below average, and fix the underlying issue.

What is a realistic budget to start with in Australia?

It depends entirely on your service area, competition and what a lead is worth to you. Work backwards from your cost per lead tolerance rather than picking a round number. Anyone quoting a starting budget without knowing your margins is guessing.

Should I run my own Google Ads or hire someone?

Run it yourself if you have one service, one area and the discipline to review search terms monthly. Bring in help when you have multiple services, multiple locations, or an account with a history you did not build. An audit is the cheapest way to find out which situation you are in.

Before you scale spend, it is worth knowing what a lead is actually worth to you, because that number sets your ceiling. That is working out what each lead is worth, and without it every budget decision is a guess dressed up as a plan.

If you want a second set of eyes on the account before you put more budget behind it, a Google Ads audit will tell you which of the five problems you actually have. Send through what you can share access to via the contact page and I will tell you where I would look first.