Google Ads Changes Bidding Logic on August 17: What CEOs, CMOs, and Marketers Need to Know

Google Ads is preparing an important update to its bidding systems. The change may directly affect CPA, ROAS, conversion volume, and the predictability of campaign scaling.

This is not another cosmetic interface change. Google is changing the behavior of campaigns that simultaneously:

• have the Limited by budget status;
• use a target-based bid strategy;
• run on Target CPA or Target ROAS;
• historically perform better than the target set in the account.

The update takes effect on August 17, 2026. For advertisers, this means the following: if a campaign currently has, for example, a Target CPA of $10 but actually generates conversions at $5, after the update the system may start steering the campaign closer to the stated Target CPA of $10.

In other words, what used to look like pleasant “overperformance” may stop working automatically.

What exactly Google is changing

In the official video Google Ads Bidding Update: How to Maintain Predictable Performance, Google explains that it is updating bidding systems so advertisers can scale campaigns with more predictable efficiency.

The update applies to campaigns in:

• Search;
• Shopping;
• Performance Max;
• Demand Gen;
• Travel.

Google Ads Help also states that the changes apply to campaigns in Google Ads, Search Ads 360, Google Ads Editor, Google Ads API, and, for Demand Gen, Display & Video 360. Source: Google Ads Help: Changes to target based bid strategies.

Google describes the problem directly: today, a campaign with the Limited by budget status that uses Target CPA or Target ROAS may perform better than the target that was set. But when the advertiser increases the budget, the result becomes less predictable.

After August 17, Google wants such campaigns to optimize more consistently toward the target the advertiser entered in the settings.

This sounds technical, but the business implication is simple: if your target has not been reviewed for a long time, the system may start optimizing toward an outdated business goal.

Google’s example: Target CPA $10, actual CPA $5

Google gives a very clear example.

Imagine a campaign with a Target CPA of $10. Over the last 28 days, it has actually generated conversions at $5. Before the update, such a campaign could steadily “overperform” the target, so the marketer or business owner saw a good CPA and left the settings untouched.

After the update, however, if nothing changes, Google expects the campaign to operate closer to a $10 CPA.

The issue is not that Google will automatically increase the budget. Google emphasizes separately that budgets and bid targets will not be changed automatically. The issue is different: if the system contains an inflated target, Smart Bidding will start treating that target more seriously.

For a business, this may look like this:

• conversions remain, but become more expensive;
• CPA may rise toward the old target;
• ROAS may fall toward the target level;
• the campaign may scale more predictably, but not necessarily more efficiently;
• some of the “extra” efficiency of budget-limited campaigns may disappear.

Search Engine Journal describes this as a change in Smart Bidding behavior: campaigns that previously overperformed Target CPA or Target ROAS may move closer to the targets set after August 17. Source: Search Engine Journal.

Why this matters especially for CEOs and CMOs

For a PPC specialist, this looks like a technical Smart Bidding update. For a CEO or CMO, it is a financial planning issue.

If you have campaigns that have been working “better than target” for years, it is easy to confuse real system efficiency with an outdated setting that simply stopped being challenged.

For example:

• the business considers a CPA of $30 acceptable;
• the campaign has long been running at a CPA of $18;
• the account settings still contain Target CPA $30;
• the budget is limited;
• after the update, the system starts moving closer to $30.

From Google’s point of view, this is logical: you told the system that $30 is an acceptable conversion price. From the business point of view, it may look like a sudden decline in efficiency.

That is why this update should not be left at the level of “let the PPC specialist check it.” A business decision is required: what CPA or ROAS is truly the company’s target today.

Why Google is doing this

Google’s official explanation is scaling predictability.

Right now, budget-limited campaigns with Target CPA or Target ROAS can behave paradoxically. While the budget is limited, the system often selects only the most efficient auctions. The campaign shows excellent CPA or ROAS. But when the advertiser increases the budget, efficiency can change sharply because the system has room to enter a wider set of auctions.

Google wants to make this less chaotic: if you set Target CPA at $10, the system should aim for $10 both at a small budget and when the budget increases.

This is useful for scaling, but it creates risk for advertisers who used a limited budget as an informal “efficiency filter.”

Search Engine Roundtable points to this exact tension: Google presents the change as a way to make performance more predictable, but for some advertisers it may mean more expensive conversions if their targets were set too high. Source: Search Engine Roundtable.

Who will be affected most

The highest risk is for campaigns that meet all of these conditions:

• the campaign has or had the Limited by budget status;
• Target CPA or Target ROAS is used;
• actual CPA is better than the target or actual ROAS is higher than the target;
• the target has not been reviewed for a long time;
• the budget is planned to increase in August or September;
• the campaign is a key source of leads or sales.

E-commerce, lead generation businesses, SaaS companies, local services, and businesses with seasonal demand should be especially attentive.

For Performance Max and Demand Gen, there is one more nuance: Google warns that multi-channel campaigns may see changes in how traffic is distributed across channels. So the issue is not only CPA or ROAS at campaign level. The source mix behind conversions may also change.

What to do before August 17

Google offers several scenarios.

The first scenario is to change nothing. This makes sense if the current Target CPA or Target ROAS truly reflects the business goal. If Target CPA $10 is acceptable economics for the business, it can be left unchanged. But you should understand that a campaign that previously ran at $5 may start moving closer to $10.

The second scenario is to bring the target closer to actual performance. If a campaign has Target CPA $10 but consistently delivers CPA $5, and the business wants to preserve that $5 level, Google recommends updating the target to $5 through the Bid Target Adjustment Tool.

The third scenario is to set a custom goal. For example, if $5 is too aggressive and $10 is too expensive, you can set Target CPA at $7. This is already a management decision: how much the business is willing to pay for additional volume.

The fourth scenario is to change the bidding strategy. If the business needs maximum volume within a fixed budget, Google suggests considering Maximize Conversions or Maximize Conversion Value. But there is a tradeoff: without Target CPA or Target ROAS, actual efficiency may fluctuate more when the budget changes.

Bid Target Adjustment Tool: what it is and why it matters

Starting July 6, 2026, Google began making the Bid Target Adjustment Tool available. Its purpose is to help advertisers find campaigns that may be affected by the update, review historical performance, and quickly update targets.

Google says that notifications about the tool are sent to advertisers who, over the last 12 months, had campaigns with the Limited by budget status and target-based bid strategies.

PPC Land writes that the tool effectively gives advertisers a short window for action between July 6 and August 17. Source: PPC Land.

This is important: if you do nothing, Google will not change your targets automatically. But that is exactly the risk. The system will optimize toward the target you leave in place.

Why there may be turbulence after the update

Even if everything is prepared correctly, a period of instability should be expected. Any change in target, budget, or bidding behavior can trigger a relearning phase.

The important thing is not to panic in the first days and not to break campaigns with chaotic edits.

This is how I formulate it for clients:

“Google employees warn that after the new algorithm is connected, advertisers should expect a couple of weeks of turbulence while the system relearns.”

This does not mean doing nothing. It means that after August 17, performance should be evaluated not by a single day, but by the full conversion cycle. Google Ads Help also recommends waiting 1-2 conversion cycles after a budget increase to evaluate performance correctly.

Practical checklist for the marketing team

Before August 17, audit all active campaigns.

First: find campaigns with the Limited by budget status.

Second: filter campaigns using Target CPA, Target ROAS, and other target-based bid strategies.

Third: compare the current target with actual performance over the last 28, 60, and 90 days.

Fourth: mark campaigns where actual CPA is significantly lower than Target CPA or actual ROAS is significantly higher than Target ROAS.

Fifth: decide for each campaign what the business goal is: preserve efficiency, increase volume, or find a compromise.

Sixth: make changes through the Bid Target Adjustment Tool or manually.

Seventh: avoid making too many changes at once to budgets, targets, creatives, and tracking, so that after August 17 it is clear what actually affected the result.

Eighth: warn management, sales, and finance in advance that CPA, ROAS, traffic, and lead volume may fluctuate during the first weeks after the update.

What this means strategically

This update clearly shows the broader direction of Google Ads: the system wants advertisers to separate two things more clearly.

Budget answers the question: how much are we willing to spend?

Target CPA or Target ROAS answers the question: what efficiency is acceptable for us?

Previously, budget-limited campaigns sometimes allowed advertisers to get “better than target” efficiency simply because budget constrained the system. After August 17, Google will try to make this logic less accidental and more tied to the stated goals.

For businesses, this means targets can no longer remain approximate. They must be financially justified.

If your Target CPA is too high, you are effectively giving Google permission to buy conversions at a higher price. If your Target ROAS is too low, you are giving the system room to scale with lower profitability.

Conclusion

The Google Ads update coming on August 17, 2026 is not a minor Smart Bidding change. It changes the behavior of campaigns that were budget-limited while overperforming their CPA or ROAS targets.

For some advertisers, the update will be useful: scaling will become more predictable and budget changes less chaotic.

But for advertisers who have lived for years with outdated targets, it may become an unpleasant surprise. Campaigns may start operating closer to goals that no longer reflect the real economics of the business.

Therefore, the main action before August 17 is simple: review targets, compare them with actual performance, and decide what exactly you want to preserve — current efficiency, more volume, or a controlled compromise between the two.