You're spending money on Google Ads. The clicks are coming in. But the sales aren't matching the spend.
Sound familiar?
Most Google Ads budgets leak in the same predictable places. And most businesses don't realise until they've burned through thousands of pounds.
The frustrating part is that these leaks are usually easy to fix once you know where to look.
This post shows you the 6 most common budget leaks, how to spot them in your account, and how to fix them fast — without needing to be a PPC expert.
Google Ads is designed to spend your budget. That's how Google makes money.
If you're not actively managing where that budget goes, it'll get spent on low-intent clicks, irrelevant searches, and placements that don't convert.
Most people look at total clicks and assume it's working. The dashboard shows activity. The numbers are going up. It feels like progress.
But clicks don't pay the bills, conversions do.
And when you dig into the data, you often find that a huge chunk of your budget is being wasted on traffic that was never going to buy.
The leaks are usually hidden in the data. You need to know where to look. Once you do, they're obvious - and fixable.
Broad match is Google's default keyword match type. It lets Google show your ads for "related" searches - which sounds helpful, but often means your ads appear for searches that have nothing to do with what you sell.
For example, if you're selling "luxury kitchen mixers" and you're using broad match, your ad might show for:
None of those searches are likely to convert. But you're paying for every click.
How to spot it:
Go to your Google Ads account and open the Search Terms report (under Keywords > Search Terms).
This shows you the actual searches that triggered your ads. Look for searches that have nothing to do with what you sell, or searches with low intent (people researching, not buying).
If you see a lot of irrelevant searches, broad match is probably the culprit.
How to fix it:
Switch to Phrase Match or Exact Match for better control.
You'll get fewer clicks, but the clicks you do get will be far more relevant — and more likely to convert.
Also, add any irrelevant searches as negative keywords (more on that next).
Negative keywords tell Google not to show your ads for certain searches.
Without them, your ads will show for all sorts of searches you don't want — like "free", "cheap", "DIY", "jobs", "careers", competitor names, or anything else that's not relevant to your business.
Every one of those clicks costs you money. And none of them will convert.
How to spot it:
Check your Search Terms report again. Look for patterns of low-intent or irrelevant clicks.
Common examples are:
Competitor brand names (unless you're deliberately targeting them)
How to fix it:
Build a negative keyword list. Start with the obvious ones:
Then add more as you review your Search Terms report each week.
You can add negative keywords at the campaign level or create a shared negative keyword list that applies across all campaigns.
This is one of the fastest ways to stop wasting budget.
By default, Google shows your ads on Search Partners — a network of third-party sites that use Google's search technology.
The quality of traffic from Search Partners is often much lower than traffic from Google Search itself. You'll get clicks, but they rarely convert.
How to spot it:
In your Google Ads account, go to Campaigns and segment by Network (with search partners).
Compare performance:
If Search Partners has high spend but low (or zero) conversions, it's a leak.
How to fix it:
Turn off Search Partners. Go to your campaign settings, find Networks and uncheck Include Google search partners.
Focus your budget on Google Search only. You'll get fewer clicks, but better quality traffic.
Your ads might perform well on desktop but terribly on mobile (or vice versa). But by default, Google spends your budget equally across all devices.
If mobile traffic doesn't convert for your business (maybe your checkout is clunky on mobile, or your audience just doesn't buy on phones), you're wasting money.
How to spot it:
Segment your performance by device (desktop, mobile, tablet). Look at:
If one device has high spend but low conversions, that's your leak.
How to fix it:
Adjust your bid modifiers by device. If mobile doesn't convert, reduce mobile bids by 30–50% (or more). This tells Google to spend less of your budget on mobile traffic.
If desktop is your winner, increase desktop bids by 20–30% to prioritise that traffic.
You can also improve mobile performance by fixing your mobile landing page experience — but if that's not realistic right now, just reduce mobile spend.
Your ads are fine. Your targeting is fine. People are clicking. But your landing page is slow, confusing, or doesn't match the ad, so they leave without buying.
This is one of the most expensive leaks because you're paying for clicks that were never going to convert.
How to spot it:
Look at your click-through rate (CTR) vs your conversion rate.
If your CTR is good (2%+) but your conversion rate is terrible (<1%), the problem is your landing page, not your ads.
Also check:
How to fix it:
Match the landing page to the ad. If your ad says "20% off luxury kitchen mixers", your landing page should say the same thing. Don't send people to your homepage and make them hunt for the offer.
Speed it up. Slow pages kill conversion. Use Google PageSpeed Insights to check your load time. Aim for under 3 seconds.
Remove friction. Is your CTA obvious? Is the form too long? Are there too many options? Simplify.
Make it mobile-friendly. If most of your traffic is mobile, your landing page needs to work perfectly on a phone.
Even small improvements here can double your conversion rate, which means you get twice the results from the same ad spend.
Some keywords cost £5, £10, even £20 per click — but they never convert.
You're spending hundreds (or thousands) of pounds on traffic that doesn't buy.
This happens when:
How to spot it:
In your Google Ads account, go to Keywords and sort by cost.
Look for keywords that have:
How to fix it:
Pause or reduce bids on keywords that don't convert.
Don't keep spending money on a keyword just because it gets clicks. If it's not converting after £100–£200 of spend, it's not going to.
Reallocate that budget to keywords that do convert. Sort your keywords by conversion rate and cost per conversion. Find the winners. Increase bids on those.
This is one of the fastest ways to improve ROI without increasing your overall budget.
You don't need to be a PPC expert to spot these leaks. You just need to know where to look. Here's a simple checklist you can run through once a month:
Look for irrelevant searches. Add them as negative keywords.
Compare Google Search vs Search Partners. If Search Partners isn't converting, turn it off.
Look at desktop vs mobile vs tablet. If one device is bleeding budget with no conversions, adjust your bid modifiers.
Pause anything that's spent £100+ with zero conversions. Reallocate that budget to keywords that work.
Are they fast? Do they match the ad? Is the CTA clear? If not, fix them.
If you're using Broad Match, switch to Phrase or Exact for better control.
Run this audit once a month, and you'll catch leaks before they cost you thousands.
The good news is that these leaks are fixable. You don't need to rebuild your account from scratch. You just need to plug the gaps.
Most Google Ads budgets leak in the same six places: broad match keywords showing ads for irrelevant searches, no negative keywords letting junk traffic through, Search Partners draining budget with low-quality clicks, device mismatches where mobile or desktop bleeds money, weak landing pages that don't convert, and high-cost keywords that never deliver results.
Once you know where to look, you can fix them fast. Run the 20-minute audit. Plug the leaks. Reallocate budget to what's working.
You'll get better results from the same spend, or the same results from less spend. Either way, you win.
