Back in July, I warned that Google was about to change how Smart Bidding treats “Limited by budget” campaigns, and that the shift landing August 17 would push actual costs closer to whatever number you typed into your Target CPA or Target ROAS box — whether you meant it as a hard ceiling or an aspirational stretch goal. The update has now been live for a full reporting cycle, and the early data confirms it did exactly that, with a wrinkle that matters even more than the original warning: the cheap inventory budget-capped campaigns used to quietly capture appears to be flowing somewhere else entirely.
Here’s what actually happened when Google flipped the switch, why I think it turns a budget cap into a penalty instead of a safeguard, and what that means if you run lean, disciplined budgets in a vertical like legal.
1. What Bid Suppression Actually Was
For years, when a campaign was flagged “Limited by budget,” Smart Bidding quietly suppressed bids behind the scenes to stretch that budget further — which is why so many budget-capped accounts looked like they were overperforming. Per the analysis behind this update, more than half of the budget-limited campaigns reviewed were beating their stated ROAS or CPA targets before August 17. That wasn’t a sign the account was exceptionally well built. It was the algorithm being deliberately conservative because it knew the money would run out before the day did.
2. What Changed When Google Flipped the Switch
Google’s update rolled out August 17 and finished globally by August 27. Since then, Search Engine Land’s reporting on the rollout shows a clear split. Median CPCs on budget-limited Target ROAS campaigns rose almost 16%, while CPCs on campaigns that were never budget-constrained actually dropped about 13% over the same window. The composition of lost impression share shifted too: rank-based losses — the kind you can fix with a better bid, ad, or Quality Score — fell from roughly 45% to 30% of the total, while budget-based losses — the kind only a bigger budget can fix — jumped from about 4% to 33%. Median impression share on budget-limited campaigns dropped from roughly 40% to 31%.
3. The Real Issue: Your Budget Cap Just Became a Growth Tax
A budget cap is supposed to be a control lever — a way to tell Google “spend no more than this, no matter what.” What this update actually does is make that control more expensive to keep. If you hold your budget flat, your reach shrinks and more of that shrinkage now shows up as “budget-limited” rather than “outranked,” which gives you a lot less to act on. Outranked tells you to fix your bid, ad relevance, or landing page. Budget-limited tells you to spend more, full stop. Combine that with the analysis suggesting the cheaper auction slots budget-capped campaigns used to win are now shifting toward advertisers with no budget ceiling at all, and the honest read is that Google’s newest “efficiency” update rewards accounts willing to remove their spending limits and quietly squeezes the ones that don’t. That’s the same one-directional nudge I flagged in last week’s Spend Benchmarks rollout — it just arrived wearing a different label this time.
Why This Hits Law Firms Hardest
Picture a personal injury firm running “car accident lawyer” keywords at $400–$500 a click, deliberately capped at a daily budget because the cost of an untargeted click is brutal and the firm has already done the math on what a real lead is worth. That firm is exactly the profile this update penalizes. Before August 17, the algorithm’s bid suppression was quietly protecting that budget by being selective about which auctions it entered. Now the same campaign either loses more impression share to a budget constraint it can’t fix without raising spend, or the account owner raises the daily budget just to hold the reach it already had — which is precisely the outcome I warned about with the Max CPC workaround in the original post, except now it applies market-wide, not just to accounts that ignored the August 17 change. For a vertical where a single bad click can cost as much as a week’s worth of leads in a lower-CPC industry, that trade-off deserves scrutiny, not a rubber stamp.
The Playbook Before You Touch Your Budget
- Pull your impression-share-lost breakdown by campaign. Compare the rank-based versus budget-based split from before and after August 27. A sharp jump in budget-based loss tells you this update — not your creative or your bids — is the reason reach dropped.
- Re-verify your Target CPA and Target ROAS against real, current performance. If a target was quietly overperforming thanks to bid suppression, treat that as your true benchmark, not the number that’s been sitting in the settings for a year.
- Keep your Max CPC cap tight and non-negotiable, especially in high-CPC verticals like legal. The algorithm is now hungrier to spend up to your target, and the cap is still the only hard backstop you have.
- Decide deliberately whether to raise budgets — don’t let a reach drop make the decision for you. If profitability supports more spend, that’s a legitimate call. If you’re raising budget only to defend impression share you already had, you’re paying to stand still.
- Separate high-intent and low-intent keywords into isolated campaigns so a budget-limited campaign can’t dilute your highest-value terms while chasing volume to hit an inflated target.
Not sure whether your budget caps are protecting you or quietly costing you reach after this update? Let’s find out with your real numbers.
About the Author
Melissa is the Founder and Lead Strategist at Visionary Search, based in Dallas, Texas. With 20+ years of experience managing high-stakes Google Ads accounts, she specializes in protecting and scaling ad spend for high-CPC industries like med spas, CPG brands, and hospitality businesses. As Google pushes further into automation, she helps clients keep control of their targeting, their data, and their budgets — instead of handing it all to the algorithm.
Connect with her today to review your account before the next automatic update rolls out.
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