Google Ads Mistakes: 8 Budget-Killers and How to Fix Them

In over a decade of running campaigns, I've looked at a lot of Google Ads accounts run by business owners, in-house marketing teams, and even other agencies. The same problems come up again and again. They are rarely obscure edge cases; they are fundamental mistakes that silently drain budgets month after month while everyone wonders why the leads have dried up.

The frustrating part is that most of these are fixable in an afternoon. The difference between a Google Ads account that pays for itself and one that burns money often comes down to a handful of settings and strategic decisions that nobody bothered to check.

Here are the mistakes I see most often, why they matter, and exactly how to fix them. If you're running Google Ads yourself or working with an agency, use this as a checklist. I'd bet at least three of these apply to your account right now.

1. Using broad match keywords without Smart Bidding

This is probably the single biggest budget-waster I see. Someone sets up a campaign, adds a list of keywords on broad match (the default), and walks away. Within a week, they've burned through hundreds of euro on searches that have nothing to do with their business.

Here's the thing about broad match: Google takes significant liberties with it. If you're a plumber in Dublin and you bid on "plumber Dublin" as broad match, Google might show your ad for "plumbing courses Dublin," "plumber salary Ireland," or "DIY plumbing tips." Those clicks cost you money and deliver nothing.

Now, broad match isn't inherently bad. Google has actually improved it significantly over the past couple of years, particularly when paired with Smart Bidding strategies like Target CPA or Target ROAS. When Google's machine learning can see your conversion data, it gets much better at deciding which broad match queries are worth bidding on. But broad match without Smart Bidding? That's just handing Google a blank cheque.

How to fix this

• If you don't have conversion tracking set up (more on that below), don't use broad match at all. Stick with phrase match and exact match until you have enough conversion data for Smart Bidding to work with.
• If you do have conversion data, test broad match keywords in a separate campaign with Target CPA or Maximise Conversions bidding. Give it at least 2-3 weeks and 30+ conversions before judging performance.
• Review your search terms report regularly. Even with Smart Bidding, broad match will trigger some irrelevant queries. You need to catch those and add them as negative keywords.

2. Ignoring negative keywords entirely

If I could only fix one thing in most Google Ads accounts, this would be it. Negative keywords are the terms you tell Google not to show your ads for. Without them, you're paying for clicks from people who were never going to buy from you.

Take a solicitor in Dublin bidding on "family lawyer Dublin" with no negative keywords. Their ads can show for "family lawyer salary," "how to become a family lawyer," "free family legal advice," and dozens of other terms that will never result in a client. Those irrelevant clicks add up quickly.

Every industry has a set of obvious negative keywords you should add from day one: "free," "jobs," "salary," "how to become," "DIY," "course," "training," and so on. Beyond that, you need to review your search terms report weekly for the first few months, then at least monthly after that.

How to fix this

• Build a starter negative keyword list before you launch. Think about all the reasons someone might search for your keywords that don't involve buying. Add those terms as negatives.
• Create a shared negative keyword list at the account level. This applies to all campaigns and saves you from adding the same negatives over and over.
• Check your search terms report weekly. In Google Ads, go to Keywords > Search Terms. Sort by cost and look for anything irrelevant. Add it as a negative keyword immediately.
• Use negative keyword lists by theme. For example, a "job seekers" list ("jobs," "salary," "career," "hiring," "vacancy"), a "DIY" list ("how to," "tutorial," "guide," "template," "free"), and an "education" list ("course," "training," "degree," "certification").

3. Not tracking conversions (or tracking them wrong)

This one genuinely baffles me, but I see it constantly: people spending thousands a month on Google Ads with no conversion tracking set up. They have no idea which keywords, ads, or campaigns are actually generating leads or sales. They're just looking at clicks and impressions and hoping for the best.

Without conversion tracking, you can't use Smart Bidding, you can't tell which campaigns are profitable, and you can't work out your cost per lead or return on ad spend. You're essentially running your business with a blindfold on.

Almost as bad is incorrect conversion tracking. Common mistakes include tracking page views as conversions, counting every form submission even if it's spam, not filtering out duplicate conversions, or tracking button clicks instead of actual completed actions. It is common to find accounts where most of the recorded "conversions" are navigation clicks being miscounted rather than real enquiries.

How to fix this

• Define what a conversion actually means for your business. For most service businesses, it's a form submission, phone call, or live chat enquiry. For e-commerce, it's a completed purchase. Don't track anything else as a primary conversion.
• Use Google Tag Manager to implement your tracking properly. Set up triggers for form submissions (on the thank-you page, not the form page), phone call clicks, and purchases.
• Import offline conversions if you have a longer sales cycle. If someone clicks your ad, fills in a form, and then becomes a customer two weeks later after a phone call, that conversion data needs to get back into Google Ads. That is how the algorithm learns what a good lead looks like.
• Set up Enhanced Conversions. This is Google's privacy-safe way of matching conversion data back to ad clicks. It significantly improves attribution accuracy, especially as third-party cookies continue to disappear.
• Audit your existing tracking. Go to Tools > Conversions in Google Ads. Check what's being tracked, how it's counted, and whether the numbers match reality. If your Google Ads conversions don't roughly match your CRM data, something's wrong.

4. Sending all traffic to your homepage

Your homepage is designed to serve everyone. It gives a general overview of your business, links to different services, and tries to appeal to a broad audience. That's exactly why it's a terrible landing page for paid ads.

When someone searches for "emergency plumber Galway" and clicks your ad, they want to know three things immediately: do you serve Galway, can you come right now, and how do they contact you? If they land on your homepage and have to navigate through your services menu to find your emergency plumbing page, you've already lost them. They'll hit the back button and click on a competitor who gives them the answer immediately.

This is one of the reasons web design and PPC need to work together. Your landing pages need to be built specifically for your ad campaigns, with messaging that matches the ad copy, a clear call to action above the fold, and minimal distractions.

How to fix this

• Create dedicated landing pages for each ad group or campaign theme. They don't need to be complex. A strong headline, a brief description of the service, social proof (reviews, testimonials), and a prominent contact form or phone number.
• Match the landing page headline to the ad copy. If your ad says "Emergency Plumber in Galway - Available 24/7," your landing page headline should echo that. This improves your Quality Score and conversion rate simultaneously.
• Remove navigation menus from PPC landing pages where possible. The only action you want visitors to take is converting. Don't give them links to wander off to your blog or About page.
• Include trust signals above the fold. Google reviews, industry certifications, "X years in business" badges. People who click on ads are comparison shopping. Give them reasons to choose you without scrolling.

5. Ignoring Quality Score

Quality Score is Google's rating of the quality and relevance of your keywords, ads, and landing pages. It's scored from 1 to 10, and it directly affects two critical things: how much you pay per click and where your ad appears on the page.

Here's the maths that most people don't realise. Your actual position in the ad auction is determined by your Ad Rank, which is your bid multiplied by your Quality Score (simplified, but that's the principle). So an advertiser with a Quality Score of 8 bidding EUR2 will outrank an advertiser with a Quality Score of 4 bidding EUR3. The first advertiser pays less and gets a better position.

Over time, the cost difference adds up. Raising Quality Score across your core keywords lowers what you pay per click, and on a EUR5,000/month budget even a 30% reduction would mean EUR1,500 saved every month for the same traffic.

The three components of Quality Score

1. Expected Click-Through Rate (CTR): How likely someone is to click your ad. This is influenced by your ad copy, ad extensions, and historical performance.
2. Ad Relevance: How closely your ad copy matches the intent behind the keyword. If you're bidding on "accountant Cork" but your ad talks about generic "business services," your ad relevance will be low.
3. Landing Page Experience: How relevant, useful, and easy-to-navigate your landing page is. This includes page speed, mobile friendliness, content relevance, and clear calls to action.

How to fix this

• Organise your ad groups tightly. Each ad group should contain 5-15 closely related keywords. Don't dump 50 different keywords into one ad group and write one generic ad for all of them.
• Include your primary keyword in the ad headline. This seems obvious, but a huge number of accounts have ad groups where the keyword doesn't appear anywhere in the ad text.
• Improve your landing page speed. Google cares about this, and so do your visitors. A landing page that takes 5 seconds to load on mobile will tank your Quality Score and your conversion rate. Read more about how speed impacts conversions.
• Use all available ad assets (formerly called extensions). Sitelinks, callouts, structured snippets, call extensions, location extensions. They make your ad larger and more informative, which improves CTR.

6. Not testing ad copy

Most accounts I audit have ad groups with a single Responsive Search Ad (RSA) that was written once and never touched again. Some still have old Expanded Text Ads from years ago that were grandfathered in. Nobody's tested different headlines, descriptions, or calls to action. They just wrote something reasonable, published it, and moved on.

Ad copy testing is one of the highest-leverage activities in Google Ads. Small changes in wording can produce significant differences in click-through rate and conversion rate. A change as small as "Get a Free Quote" to "Get Your Free Quote Today" can move click-through rate, and a specific, true number in a headline often beats a vague claim.

How to fix this

• Provide variety in your RSA headlines and descriptions. Google recommends at least 8-10 unique headlines and 3-4 descriptions per RSA. Don't write 15 variations of the same thing. Give genuinely different angles: benefits, features, social proof, urgency, price points.
• Pin sparingly. Pinning headlines to specific positions reduces Google's ability to optimise. Only pin if there's a compliance or brand reason (e.g., your brand name must always appear in headline 1).
• Review asset performance. In Google Ads, check the "View asset details" for each RSA. Google rates each headline and description as "Best," "Good," or "Low." Replace the "Low" performers with new variations.
• Test different value propositions, not just different wording. Try leading with price vs. quality vs. speed vs. experience. Find out what your audience actually responds to.
• Run experiments. Use Google Ads' built-in experiment feature to test landing pages, bidding strategies, or ad variations with proper statistical significance.

7. Spreading budget too thin

This is the strategic mistake that underpins a lot of other problems. A business with a EUR1,000/month budget tries to run campaigns for all 15 of their services across search, display, and YouTube. The result? Each campaign gets EUR2-3 per day, which isn't enough to generate meaningful data, let alone meaningful results.

Google's machine learning needs data to work. Smart Bidding strategies typically need 30-50 conversions per month per campaign to optimise effectively. If your budget only allows for 5 conversions per campaign per month, the algorithm never gets enough signal to learn what works.

I'd rather see a EUR1,000 budget concentrated on one or two high-intent campaigns that generate 40-50 conversions per month than the same budget spread across ten campaigns that each generate 3-4.

How to fix this

• Identify your highest-value services or products. Which ones have the best margins? Which ones are easiest to sell? Start there.
• Calculate your required budget. Work backwards from your target cost per acquisition. If your target CPA is EUR50 and you need 30 conversions per month for Smart Bidding, that's EUR1,500 for that single campaign. If your total budget is EUR1,500, run one campaign well rather than three campaigns poorly.
• Scale sequentially, not simultaneously. Get one campaign profitable, then use the proven learnings (ad copy, landing pages, negative keywords) to launch the next one. Each new campaign benefits from everything you learned in the last.
• Cut underperformers ruthlessly. If a campaign has spent 3x your target CPA without producing a conversion, pause it. Redirect that budget to what's working.

8. Not using audience targeting

Keywords tell Google what someone is searching for. Audiences tell Google who they are. Using both together is significantly more powerful than using keywords alone.

Google offers several audience types that most advertisers ignore entirely:

• Remarketing audiences: People who've already visited your website. These are your warmest prospects and typically convert at 2-5x the rate of cold traffic.
• In-market audiences: People Google has identified as actively researching products or services in your category. They're comparison shopping right now.
• Customer Match: Upload your customer email list and target similar people, or exclude existing customers from acquisition campaigns.
• Similar audiences / Lookalikes: Google finds people who share characteristics with your existing customers or converters.

At minimum, every Google Ads account should have a remarketing campaign running. If someone visited your website and didn't convert, following up with a targeted ad is one of the cheapest and most effective ways to bring them back.

How to fix this

• Set up remarketing immediately. Install the Google Ads remarketing tag (or use Google Tag Manager), create audience lists for key pages (service pages, pricing pages, cart abandonment), and build a remarketing campaign with tailored messaging.
• Add audiences in "Observation" mode to your search campaigns. This doesn't restrict who sees your ads but lets you see how different audiences perform. You might discover that in-market audiences convert at twice the rate, and then increase bids for that segment.
• Use Customer Match if you have a decent email list (1,000+ contacts). Upload it to Google Ads and create a Similar Audience based on your best customers.

Bonus: not looking at the account structure

Most of the mistakes above are symptoms of a deeper problem: poor account structure. When campaigns are disorganised, ad groups are bloated, and there's no logical hierarchy, everything suffers. Quality Scores drop, budget allocation becomes guesswork, and reporting stops meaning much because everything is lumped together.

A well-structured Google Ads account follows a clear hierarchy:

1. Campaigns organised by service/product category, location, or funnel stage
2. Ad groups containing tightly themed keywords (5-15 per group)
3. Ads with copy specific to that ad group's theme
4. Landing pages aligned with each ad group's intent

If your account doesn't follow this structure, that's often the root cause of budget waste. Sometimes the best thing you can do is pause everything, restructure the account properly, and relaunch.

The bottom line

Google Ads is one of the most powerful paid advertising platforms available. When it works, it delivers qualified leads at a predictable cost, and you can scale it up as fast as your business can handle. But it's unforgiving of laziness, and it rewards advertisers who take the time to structure their accounts properly, write relevant ads, build good landing pages, and continuously optimise.

If any of these mistakes sound familiar, you're not alone, because most accounts we're asked to look at have several of them. Everblue is a Google Partner, and these are the first things we check when a business hires us as its PPC agency.

The good news is that most of these problems are quick to fix, and cleaning up negative keywords, fixing conversion tracking, and restructuring campaigns is usually where the biggest savings are.

If you've fixed all of these and your campaigns still aren't delivering, our Google Ads not working guide walks through ten common causes, with how to diagnose and fix each one.

If you'd like a second pair of eyes, book a free website audit. We'll look over your website and landing pages before a free 20-minute call, then walk you through what we'd fix first, and you're welcome to bring your Google Ads questions too. There's no obligation to work with us afterwards.