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Search Campaign continually spends under budget
Posted by on March 27, 2026 at 5:59 pmI have a client who's account has not been able to spend the full budget for months now, despite everything we have tried. I even had a friend who has been doing this way longer than me look after the account for a couple months and they couldn't figure anything out either. The weirdest part to me is that Google keeps saying the campaign is limited by budget.
The campaign has a $40/day budget and in February only spent $150~ across the three ad groups. Here are some of the campaign settings:
Marketing Objective – Leads
Bidding – Maximize conversions (this was changed from maximize clicks in November to try and fix this issue)
No value rules set
Bid equally for new and existing customers
Audience is on observation only
Broad match keywords – off, use keywords match type
The only thing I can think of at this point is that the client has been very strict about negative keywords, wanting to focus on specific terms that they 'feel' will do better without optimizing the webpage for these terms, meaning that almost all of our top performing keywords have a 'below average' landing page experience.
Any and all ideas would be appreciated.
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1 Reply
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Do the keywords that you’re targeting have enough search volumes ? Also, is there any conflicting negatives in the campaign?
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“Bidding – Maximize conversions (this was changed from maximize clicks in November to try and fix this issue)”
You’re reversing the order. To generate conversions, you need clicks first, not the other way around. The tendency is for your CPC to increase and for you to end up with even fewer clicks. That’s basically just burning money.
What is your impression share? In your case, it seems like a problem of overly narrow targeting and low search volume.
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Honestly, I’ve been there and it’s usually one of three things: your bids are too low for the auction, your keyword match types are too restrictive, or your target CPA is set too aggressively for the algorithm to find conversions. If your optimization score is high but spend is low, Google basically thinks it can’t win auctions at your current price point. Try bumping your bids by 20% for a few days just to prime the pump and see if the volume picks up. It’s not perfect, but it usually forces the system to start testing.
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If a campaign is only spending $150 in a month on a $40/day budget, it’s usually not really budget-limited, it’s being choked by too little search volume, overly restrictive negatives/keywords, low Ad Rank, or Max Conversions not having enough signal to bid into auctions.
I’d check negatives and impression share first, then test opening coverage a bit and even switching temporarily to Max Clicks or Manual CPC to confirm the campaign can actually access more inventory.
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This is almost always a landing page relevance issue compounded by the bidding strategy switch.
You switched to maximize conversions but the campaign probably doesn’t have enough conversion data to optimize properly. Google needs roughly 30-50 conversions per month for that bidding strategy to work. If you’re only spending $150/month you’re getting maybe 2-5 conversions. The algorithm has nothing to learn from so it just stops spending.
The ‘below average’ landing page experience is killing you twice. Once on quality score which raises your CPCs so the $40/day buys fewer clicks. And again on the algorithm’s willingness to spend because Google sees low relevance and decides your ads aren’t worth showing.
What I’d try:
Switch back to maximize clicks with a bid cap for 30 days. You need volume and data before you can optimize for conversions. Let the budget actually get spent first.
Have a direct conversation with the client about the negative keywords. Pull the search terms report and show them what’s actually converting vs what they think should convert. Data wins that argument every time.
Fix the landing page. This is the real bottleneck. Page needs to match the keyword intent, load fast, and have clear conversion actions. Everything else is a band-aid until this is solved.
Also worth checking what competitors in this space are running right now. I do this for my clients before touching any campaign settings. Sometimes the issue isn’t your ads, it’s that competitors changed their approach and the auction dynamics shifted. You can see what anyone is running through Meta Ad Library or similar tools for Google. Gives you a baseline before you start testing changes. -
“Limited by budget” while underspending is almost always a Quality Score problem, not a budget problem. The below average landing page experience is the real culprit. With Maximize Conversions and poor QS, Google stops entering auctions because it can’t bid competitively, so the budget never gets touched. The overly aggressive negative keyword list is making it worse by shrinking eligible volume even further.
Try switching back to Maximize Clicks temporarily to get volume flowing again, and loosen the negatives enough to see what traffic actually exists. The harder conversation is with the client about the landing pages, because no bidding strategy fixes a structural QS issue on the page side.
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It’s because behind the scenes Google is throttling traffic on phrase and especially exact match. They are basically removing exact match without telling anyone because they don’t want the backlash. It’s extremely sneaky and dishonest on their part for doing this, but it’s the reality. This is most likely the main cause. You COULD try switching back to max clicks, expanding your keyword list and such, and this COULD help a bit, but overall this is the main cause. In certain markets, we’re seeing we HAVE to introduce some broad match to be able to hit targets. As a result, you have to then be extremely aggressive with negatives AND introduce and optimize based on OFFLINE data. This will help offset all the junk traffic Google will try to shove down your throat. Hope this helps.
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