How much of your Google Ads budget is wasted?

Every account I open for the first time has waste in it. That's not a sales line, it's just what six years of pulling apart other people's Google Ads accounts has taught me. The question worth asking isn't whether your account is wasting money. It's how much, and whether that number is normal or a warning sign.

Here's the honest range. In accounts that haven't had a proper review in six months or more, I typically find 15 to 30 percent of spend going to search terms, placements or audiences that were never going to convert. In accounts I manage closely, with tight negatives and clean conversion data, that number sits closer to 5 to 10 percent. That's not a target you chase to zero. Some waste is structural: broad match needs room to explore before the algorithm learns, new campaigns need a data-gathering phase, and Google's own auction mechanics mean you'll occasionally pay for a click that was never going to close. If anyone selling PPC management tells you they can get your account to zero waste, that's not expertise talking. It's a sales pitch, and you should treat it as one.

What follows are the five places I find that waste hiding most often, in the order I check them, with the specific thing to look for in your own account.

The search terms report nobody's pruned in months

Broad match and phrase match keywords don't just match the keywords you wrote. They match whatever Google's system decides is close enough, and "close enough" drifts over time as the algorithm chases volume. Left unchecked, an account built on broad match will quietly start buying clicks for queries that share a topic with your keyword but nothing else: informational searches, competitor research, questions with no purchase intent, or terms in a completely different category that happen to share a word.

The tell is simple. Pull the search terms report for the last 90 days, sort by cost, and look at how many rows near the top have zero conversions. In a well-maintained account that list is short and the terms are near-misses you can negative out in five minutes. In a neglected account it's pages long, and you'll usually find whole clusters of irrelevant intent that have been running for months because nobody looked. If your last negative keyword list update predates your last performance review, that's your answer right there.

Performance Max spending with no exclusions or value rules

Performance Max is genuinely good at finding conversions. It is also, by design, a black box. Google gives you almost no visibility into which placements, audiences or search terms are driving the spend, and without brand exclusions, without a placement exclusion list, and without conversion value rules telling the algorithm which conversions actually matter to the business, PMax will optimise for the easiest volume it can find. That often means cannibalising your existing branded search traffic, showing up on low-quality display inventory, or filling YouTube and Discovery placements that generate cheap conversions with no commercial value.

The tell here is an account with a PMax campaign running for more than a couple of months with the default settings still in place: no account-level negative keyword list applied to it, no asset group segmentation by product margin or intent, and no conversion value rules distinguishing a high-value lead from a newsletter signup. If you can't answer "which conversions came from PMax and were they worth what we paid," you're not managing that spend, you're just watching a number go down every day. This is exactly the kind of gap I look at first when I audit a PPC account, because it's usually the single largest line item nobody's actually reviewed.

A conversion signal that treats every action the same

This is the one that does the most quiet damage, because it doesn't look like waste. It looks like performance. If every conversion action in your account is weighted equally, a newsletter signup counts the same as a qualified sales call, and a $50 order counts the same as a $5,000 one, the bidding algorithm has no way to tell the difference. It will optimise for whichever conversion is easiest to get, which is almost never the one that matters to your revenue.

The tell is in your conversion actions list. Open it and ask, honestly, whether each action represents a qualified business outcome or just a form fill. If "Contact Form Submission" is set as a primary conversion action with equal weight to "Purchase," you're training Smart Bidding to chase volume, not value. Fixing this usually means either assigning conversion values that reflect actual deal value, moving low-intent actions to secondary status so they inform but don't drive bidding, or piping real revenue and lead-quality data back into the platform. That last part is a server-side tracking problem as much as a PPC one, and it's worth getting right before you touch anything else on this list, because a clean signal makes every other fix downstream more effective.

A campaign optimising perfectly against the wrong signal will always look healthy right up until you check the revenue.

Targeting nobody's touched since the campaign launched

Accounts accumulate cruft. A remarketing audience built for a promotion that ended eighteen months ago is still in the ad group, still eligible to serve, still pulling in impressions from people who are no longer a relevant audience. A keyword list duplicated across three campaigns during a restructure that never got cleaned up is now competing against itself in the auction, driving up your own CPCs. An audience segment built around an old product line is still layered onto campaigns for a product line that replaced it.

None of this is dramatic on its own. It's death by a thousand small inefficiencies. The tell is structural rather than a single metric: open the account and count how many active audience lists, keyword lists and campaigns haven't had an edit in over a year. In most accounts I inherit, that number is uncomfortably high. If nobody can explain why a piece of targeting exists or what it's supposed to be doing today, it's not targeting anymore. It's just spend leaking out through a door nobody remembered to close.

A bidding strategy fighting the actual business goal

This one is the most avoidable, and the one I see most often on accounts that were set up quickly and never revisited. Maximize Clicks on a lead-generation account will do exactly what it says: get you the most clicks for your budget, with zero regard for whether those clicks convert into anything. Target Impression Share on a low-funnel campaign burns budget on visibility rather than outcomes. Maximize Conversions with no target CPA, running on an account that already has healthy conversion volume, will keep expanding spend into progressively lower-quality traffic because the strategy has no ceiling telling it when a conversion costs too much.

The tell is a direct comparison: what is the bidding strategy actually optimising for, and is that the same thing the business needs from the campaign? If your sales team needs qualified leads and your bidding strategy is optimising for click volume, that mismatch alone can account for a meaningful share of wasted spend, and it's usually a one-line fix once someone notices it. Nobody notices it because nobody asks the question, they just look at whether spend and clicks are going up.

The ten-minute self-audit

You don't need a full account review to get a first read on your own number. Two checks, run today, will surface most of what's above.

First, pull the search terms report, filter to the last 90 days, and sort by cost with zero conversions at the top. Anything with meaningful spend and no conversions is either a negative keyword candidate or evidence your match types are too loose. Second, open your conversion actions and read down the list asking one question of each: does this represent a qualified outcome, or just an action someone took on the way to one? If your primary conversion actions are a mix of the two, unweighted, that's your bidding algorithm's real problem, not your ad copy.

Those two checks alone won't give you an exact waste percentage, but they'll tell you within a few minutes whether you're closer to the 5-10 percent floor or the 15-30 percent range most unreviewed accounts sit in. If you want a faster, more structured version of this, the PPC Waste Finder walks through the same checks and gives you a live estimate based on your actual spend and the leaks you recognise from your own account.

If what you find is closer to the higher end, that's not a verdict on your business, it's just a maintenance gap, and it's a fixable one. That's the work I do for clients through PPC management, and it usually pays for itself within the first month just from the accounts I've reclaimed from broad match and Performance Max running with no guardrails.

Filed under: PPC · Google Ads · Budget · 2026