Quick Answer
Google Ads wasted spend produces seven recognizable symptoms: high impression share at low ROAS, search-terms-to-keywords mismatch, cost-per-conversion drift, overlapping campaign coverage, brand cannibalization through PMax, feed disapproval persistence, and attribution-model ROAS delta.
Signs 1-3: The bid-efficiency signals
Impression share above 80 percent on non-brand with ROAS under target means over-bidding. Search terms report mismatch above 40 percent means match type decay. Cost per conversion drifting up without volume rise means quality signal degradation. The fast diagnostic for whether each campaign is on the right bid strategy for its conversion volume is the 20-minute bid-strategy audit; signs 1-3 here are usually downstream of a stage-mismatched bid strategy.
Signs 4-5: The coverage signals
Overlapping campaign coverage triggers internal auction competition; the same query in two campaigns wastes budget on both. Brand cannibalization through Performance Max absorbs 15 to 20 percent of brand budget in accounts without brand negatives applied.
Signs 6-7: The measurement signals
Feed disapprovals above 10 percent of catalog disqualify eligible inventory from serving. Attribution model ROAS delta above 30 percent between diagnostic and last-click signals model misfit and produces inconsistent commercial reads.
Common Questions
On record.
What percentage of Google Ads spend is typically wasted?
Across diagnostic engagements in 2025-2026, median wasted spend identified on first-pass review is 27 percent of monthly budget.
Can I cut wasted spend without reducing conversions?
In most cases yes. Wasted spend is by definition low-value clicks; removing it preserves conversions while reducing cost. Expect a 2-3 week recalibration dip, then recovery.
Which sign produces the fastest fix?
Match type mismatch. Converting broad to phrase match with specific negatives improves budget efficiency within one week.
Do I need an audit if I can see these signs myself?
The signs are self-diagnosable. The diagnostic adds the structural read of why multiple signs appear together and in what order to resolve.
How often should I check these signs?
Monthly at minimum. Quality signal decays quarterly; match type decay accelerates as Google updates broad match behavior.
The Engagement Format
Begin with the diagnosis. Not the proposal.
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