Google Clarifies Smart Bidding Update as Advertisers Question Efficiency Tradeoff

Google has moved to address widespread advertiser confusion following its June 22 announcement of a Smart Bidding update that will change how budget-limited campaigns behave starting August 17, 2026.

The update affects campaigns running on Target CPA (cost per acquisition) and Target ROAS (return on ad spend) that are currently constrained by budget. For years, many of these campaigns have quietly outperformed their stated bidding targets. A campaign set to a $50 Target CPA might routinely convert at $35. Google now says that gap was never the intended outcome, and the updated system will optimise more closely toward the targets advertisers actually configure.

The clarification came after PPC professionals publicly questioned whether Google was deliberately making its own system less efficient. Google Ads Liaison Ginny Marvin stepped in to address several of the most prominent concerns directly.

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What Changes on August 17

Smart Bidding will begin aligning budget-limited campaigns more precisely with their configured Target CPA or Target ROAS targets. Google has been clear about what the update will not do.

• Budgets will not automatically increase
• Google will not alter Target CPA or Target ROAS settings without advertiser action
• Campaigns that are not budget-limited are largely unaffected

The company is rolling out account-level notifications and a Bid Target Adjustment Tool to help advertisers identify which campaigns may be impacted before the rollout date.

For campaigns that have consistently outperformed their bidding targets, the practical effect may be a shift in efficiency. A campaign averaging a $20 CPA against a $35 Target CPA could move closer to $35 after the update if the advertiser takes no action beforehand.

Google's guidance is straightforward: if $20 already reflects your actual performance goals, update the Target CPA to $20 before August 17.

Understanding how automated bidding systems interpret your campaign goals is something advertisers who have explored Google Ads intelligence and campaign optimisation strategies will be well-positioned to navigate here.

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The Efficiency Debate Dividing the PPC Industry

The update landed in a community already accustomed to scrutinising Google's automation decisions, and it did not go quietly.

The Core Concern: Is Google Building a Less Efficient System?

Kirk Williams raised the concern most advertisers were thinking in a LinkedIn post, writing:

"How and why will the system stop trying to be as efficient as possible… Does that mean smart bidding when limited by budget will no longer be trying to find better auctions? So does that mean they're building the system to literally choose to be dumber when limited by budget?"

Williams captured a genuine tension. If Smart Bidding was already delivering stronger results than the target required, why change it?

The Counterargument: Over-Performance Masked a Deeper Problem

Mike Ryan offered a counterpoint that reframed the conversation. Ryan argued Smart Bidding had not become smarter by outperforming targets. Instead, it had become too conservative, favouring only the safest auction opportunities rather than finding more volume at an acceptable efficiency level. That conservative behaviour produced impressive-looking CPAs but left potential conversions on the table.

This distinction matters. An artificially low CPA achieved by avoiding competitive auctions is not the same as genuine bidding efficiency. The system was, in effect, skewing results by being selective rather than strategic.

The Scaling Problem

Aaron Levy approached the question from a scaling perspective. He described a scenario where doubling a campaign budget caused CPA to spike unpredictably beyond the stated target. Under the updated system, Smart Bidding should hold closer to the Target CPA as budgets change, making growth decisions more straightforward for advertisers managing larger accounts.

This is a meaningful improvement for anyone attempting to scale with confidence. Unpredictable efficiency swings during budget changes have long complicated forecasting, particularly in accounts where spend decisions are tied to revenue targets.

For advertisers comparing the relative merits of paid and organic acquisition, the broader question of how SEO and PPC complement each other in a paid search strategy is worth revisiting in light of how Smart Bidding changes affect overall channel efficiency.

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How Google Responded to Advertiser Misconceptions

On the Spending Question

Ginny Marvin pushed back on one of the most persistent misreadings of the update: that Google was nudging advertisers to simply spend more money.

Responding to Search Engine Journal contributor Barry Schwartz, Marvin wrote:

"To be clear, this won't result in campaign spend changes… Our guidance for those with budget-constrained campaigns currently over-performing on their target is to ensure the targets are in line with your goals."

On Budget Constraints as an Efficiency Lever

Advertiser Jack Carr argued that budget constraints had historically functioned as a useful efficiency lever and that Google's recommendation effectively removed that advantage. Marvin acknowledged the concern and explained the underlying motivation for the change.

"Performance has often fluctuated unexpectedly… especially with budget changes. That's not been a great experience for advertisers and made it challenging to scale campaigns with confidence," she wrote.

On Traffic Quality

Kristen Kelleher raised a separate concern that tighter target adherence might push the system toward lower-quality traffic to hit volume goals. Marvin disputed that framing, stating the system would continue finding conversions at the efficiency level advertisers set rather than chasing volume at any cost.

Google's position has remained consistent across all responses: budgets control spend, and Target CPA or Target ROAS controls efficiency. The update is designed to make those two levers behave more independently and predictably — a distinction that has not always been clear in practice.

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What Advertisers Should Do Before the Rollout

Not every account requires immediate action. Campaigns already performing close to their configured targets are unlikely to see significant changes. The advertisers most affected will be those running budget-limited campaigns where actual performance has diverged meaningfully from stated targets.

Audit Your Budget-Limited Campaigns Now

Before August 17, review any budget-limited Target CPA or Target ROAS campaigns and compare current performance against the configured targets. If actual CPA or ROAS already reflects your business goals, adjust the targets accordingly before the rollout. Waiting until after the change takes effect introduces unnecessary risk.

Reassess the Role of Bidding Targets

Consider how this update changes the role of bidding targets going forward. Many advertisers have treated budget caps as a de facto efficiency tool because the system tended to over-deliver. Google is signalling that bidding targets should now carry that responsibility directly. Targets set years ago and never revisited may no longer reflect current business objectives — this update is a practical prompt to close that gap.

Use Google's Bid Target Adjustment Tool

Once available, the Bid Target Adjustment Tool will help identify which campaigns carry the most exposure to this change. Prioritise campaigns where the gap between actual performance and stated targets is widest, as these will experience the most noticeable shift.

For advertisers running multi-platform paid strategies, the principles here apply more broadly. Understanding how to manage bid targets and budget constraints across platforms — including mastering Amazon Ads campaign management and bidding strategies — reinforces why precise target-setting matters regardless of where spend is allocated.

Whether Google's prediction holds in practice remains to be seen. Advertisers managing budget-constrained campaigns will have a clear read on how closely real-world performance matches the company's stated expectations within weeks of the August 17 rollout. The Search Engine Land community has been actively tracking developments, and ongoing coverage there will provide useful benchmarking as the industry moves through the transition.