On August 17, 2026 Google is changing how budget-constrained (AKA limited-by-budget) campaigns using Target CPA and Target ROAS behave.
The headline of this algorithm change is, if a campaign has been significantly outperforming its target, leaving the setting untouched effectively gives Google permission to pursue additional volume at lower efficiency.
For example, a campaign with a $10 Target CPA might consistently deliver a $5 actual CPA. Under Google’s new bidding logic, that gap will no longer simply remain as upside for the advertiser. The system will begin optimizing more consistently toward the stated target.
In that example, the campaign could begin moving closer to a $10 CPA unless the advertiser lowers the target. Google says affected campaigns should converge toward their targets within one to two conversion cycles.
That makes this more than a routine bidding update. It changes what the target itself means, how it needs to be measured, managed, and potentially what placements and audience see your ads.
Doing nothing is a change (and a decision)
Google’s guidance focuses heavily on reviewing affected campaigns and adjusting targets before August 17. That is useful advice, but the bigger issue is deciding whether the target currently sitting in Google Ads is actually the outcome the business wants Google to deliver.
For many advertisers, Target CPA or Target ROAS has historically functioned more like a guardrail. It may be a ceiling, an inherited setting, a deliberately loose constraint or simply a number that has worked well enough operationally.
After August 17, 2026, Google will treat that number as an instruction.
That may be perfectly fine if the added conversions create profitable growth. It may be a poor trade if the target was never intended to represent the campaign’s true economic threshold.
Your Google target is not necessarily your business target
This is where advertisers should resist the temptation to treat the Bid Target Adjustment Tool as a simple administrative task.
Your first question is probably: What number should we enter so performance stays where it is today?
Once you stabilize performance, the better question is, what is the marginal incremental ROAS for this tactic and how can I leverage my bid strategy to create scale without accepting diminishing returns that no longer make economic sense?
What are unacceptable diminishing returns? This is the most important question, which is answered by business economics alone. The CPA and ROAS Google reports are useful operating metrics, but they cannot tell you on their own whether the investment is creating incremental business value.
A campaign achieving a $5 CPA does not automatically mean $5 should become the new target. And a business that can profitably acquire customers at $8 may decide it is willing to trade some efficiency for more volume.
The point is to make that decision deliberately.
More conversions do not automatically mean more growth
As we all know, algorithms are very literal. If you tell it to go get conversions, it will. Regardless of if those conversions are incremental or not. With this in mind, Google’s rationale is straightforward: by bidding more consistently toward the target, campaigns may be able to capture additional conversions or conversion value.
Platform-attributed conversions and incremental business impact are not the same thing.
If Google reports more conversions as bidding shifts, advertisers still need to determine how much of that added volume actually represents additional business. They also need to understand whether incremental revenue grows with spend, whether customer quality changes and whether the marginal return remains worthwhile.
That distinction becomes especially important when the platform selling the media is also the system deciding which additional opportunities are worth buying.
Watch out for changes in audience & placements, not just ROAS
For Performance Max and Demand Gen campaigns, Google has also said advertisers may see shifts in how traffic is distributed across placements as bidding behavior changes.
That means a relatively stable campaign-level ROAS could conceal meaningful movement underneath it, which means changes to incrementality. Additional spend might flow into different inventory, audiences or sales channels (think retail vs ecom) with very different incremental performance or customer quality.
What you need to do in the next 7 days (before August 17th)
Start by identifying campaigns using target-based strategies that are currently budget constrained and outperforming their given targets.
Ask, why is this the target? Is it a true business objective? An inherited setting? A deliberately loose ceiling? A platform efficiency metric that has never been reconciled with incremental return?
Document current performance before making changes, including spend, target and platform CPA or ROAS, conversion volume, inventory mix and, most importantly, incremental performance.
Adjust intentionally rather than reflexively, then give campaigns enough time to settle. Google says convergence should occur within one to two conversion cycles, which may mean several weeks for advertisers with longer conversion delays.
Remember, the decision to adjust or the decision to do nothing are both decisions for change.
What we will be watching, modeling, and testing
After August 17, Measured will be watching what happens not only to Google-reported performance, but to the economics underneath it: spend, bids, inventory mix, platform ROAS, incremental metrics.
In media buying, change is the only constant. We’ve been dealt a new hand, so playing the last round’s odds won’t get you anywhere. Time to re-calculate, re-strategize, and place your bets (or should I say bids)!
Want to know whether your Google campaigns are driving incremental growth, not just platform-attributed conversions? Schedule time with Measured to see how incrementality measurement can reveal the true business impact of your Google investment.