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Google is adjusting its automated bidding system. Starting August 17, 2026, ad campaigns with limited budgets will be optimized more consistently toward their specified target CPA or target ROAS. This may have a noticeable impact on costs, conversion volume, and profitability.
The Smart Bidding update is particularly relevant for campaigns that are “Limited by budget” and currently perform significantly better than their specified target. For example, if the target CPA is €10 while the actual CPA is €5, future performance may move more strongly toward the specified €10 target.
This is not necessarily a bad thing, as Google can use the available budget to unlock additional conversion volume. The crucial question, however, is whether the specified target actually reflects the company’s business objectives. At WEVENTURE Performance, we are therefore already preparing the accounts we manage for the Smart Bidding update and reviewing where targets, tracking, and actual profitability should be adjusted.
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What Is Google Smart Bidding?
Smart Bidding is Google’s umbrella term for automated bidding strategies that use Google AI to set an individual bid for every ad auction. Google refers to this as “auction-time bidding.”
The calculation can take signals such as device, location, time of day, search query, operating system, audience, and previous user behavior into account. The aim is to predict the probability and expected value of a conversion as accurately as possible.
The most important Smart Bidding strategies include:
- Target CPA
- Target ROAS
- Maximize Conversions
- Maximize Conversion Value
With target CPA, Google aims to generate as many conversions as possible at a specified average cost. With target ROAS, the goal is to generate as much conversion value as possible at a specified return on ad spend. “Maximize Conversions” and “Maximize Conversion Value,” by contrast, generally operate without a fixed efficiency target and attempt to use the available budget as fully as possible.
Since June 2026, Google has also been changing the names of some strategies. For example, “Maximize Conversions with target CPA” is now displayed more simply as “Target CPA.” However, this renaming does not change the actual bidding behavior and should therefore not be confused with the Smart Bidding update taking effect on August 17.
Is your campaign outperforming its target CPA? Then it’s affected.
What Exactly Is Changing With the 2026 Smart Bidding Update?
The Smart Bidding update affects how Google Ads campaigns are managed when two conditions apply:
- The campaign uses a target-based bidding strategy.
- The campaign is limited by its budget.
Until now, campaigns like these could significantly outperform their specified targets. For example, a target CPA of €10 could be accompanied by an actual CPA of €5. The campaign used its budget but apparently focused primarily on auctions with especially strong prospects.
Starting August 17, 2026, affected campaigns will be optimized more consistently toward the specified target. This will also apply if the budget is later increased or reduced. Google’s aim is to make scaling more predictable.
Previous Smart Bidding Behavior
Let us consider a campaign with the following settings:
- Daily budget: €200
- Target CPA: €10
- Actual CPA: €5
- Campaign status: “Limited by budget”
The campaign does not merely meet the specified target CPA—it significantly outperforms it. From the company’s perspective, this initially appears positive: a conversion costs only half of the maximum acceptable amount.
The problem often becomes apparent only after the budget is increased. If the daily budget is raised from €200 to €400, for example, the CPA may suddenly move much more strongly toward the specified €10 target. Advertisers are left with the impression that the additional budget has made the campaign less efficient.
Behavior After the Smart Bidding Update
After the Smart Bidding update, the campaign is expected to align more consistently with the €10 target CPA even with the smaller budget.
Rather than only capturing the cheapest and most likely conversions, Google can enter additional auctions as long as the average CPA remains within the specified target.
This may lead to the following changes:
- The actual CPA increases.
- The actual ROAS decreases.
- Conversion volume may increase.
- The allocation of budget across auctions and channels changes.
- Future budget increases may become more predictable.
Google does not guarantee that the actual CPA will match the target CPA exactly. The target remains an average optimization goal. Individual conversions may be significantly cheaper or more expensive.
Targets that serve your business model—not the auction
Which Campaigns Are Affected by the Smart Bidding Update?
The Smart Bidding update applies to budget-constrained campaigns using the following strategies:
- Target CPA
- Target ROAS
- Target CPC for Demand Gen
According to Google, the following campaign types are affected:
- Search
- Shopping
- Performance Max
- Demand Gen
- Travel
Display and Hotel campaigns already use the new bidding behavior. App campaigns, Video Reach campaigns, and Video View campaigns will retain their previous behavior for the time being.
Target CPA and target ROAS campaigns that are not budget-constrained are not affected. These campaigns already optimize largely in line with the specified target.
Manual CPC bidding and the “Target impression share” strategy will also remain unchanged by the update. According to Google, Smart Bidding Exploration is generally not affected either, as this feature is primarily intended for campaigns with sufficient budget flexibility.
For Performance Max and Demand Gen, advertisers should also bear in mind that the internal distribution of traffic may change. The overall objective remains the same, but Google may allocate the budget differently across Search, YouTube, Discover, Gmail, Display, or other available inventory.
Why Is Google Introducing the Smart Bidding Update?
Google’s main justification for the Smart Bidding update is improved predictability.
Until now, a budget-constrained campaign could perform significantly better than its specified target. When the budget was increased, the campaign could suddenly move much more strongly toward the specified CPA or ROAS target.
After the update, efficiency is expected to be closer to the target even before a budget change. Advertisers who subsequently increase the budget should be able to generate additional volume at a similar CPA or ROAS.
From Google’s perspective, this makes sense: a target CPA of €10 should actually be understood as a €10 target. If a company is willing to pay an average of €10 for a conversion, the system can attempt to acquire as much volume as possible within that limit.
For advertisers, this can simplify planning. Expected performance after a budget increase will be less distorted by the campaign having previously outperformed its target.
Does the Smart Bidding Update Also Serve Google’s Own Interests?
Google’s official explanation is that the update will deliver more consistent and scalable campaign performance. It is intended to make it easier for advertisers to increase budgets without unexpected changes in CPA or ROAS.
From an agency perspective, however, a more critical assessment is appropriate.
If a campaign previously had a target CPA of €10 but actually spent only €5 per conversion, part of the economically acceptable margin remained unused. After the update, Google may make greater use of this margin and win additional, more expensive auctions.
This can benefit both parties: the company receives more conversions, while Google can distribute more advertising budget across additional auctions.
It would therefore be naive to assume that the update is exclusively an improvement for advertisers. Google has a fundamental commercial interest in campaigns scaling and available budgets being spent. The Smart Bidding update may make exactly that easier.
At the same time, it would be overly simplistic to portray the update as nothing more than an attempt to increase advertising costs. Google does not automatically increase the daily or monthly budget. Nor are the target CPA or target ROAS changed without approval. The advertiser retains control over the key parameters.
The real risk therefore lies less in the update itself than in unsuitable settings. Anyone who gives Google a target CPA of €10 even though no more than €6 is economically viable internally should now be more prepared for Google to use the permitted margin.
Three Ways to Respond to the Google Smart Bidding Update
There is no single correct response. The most suitable option depends on the company’s actual business objectives.
Option 1: Leave the Smart Bidding Target Unchanged
The target can remain in place if it accurately reflects the company’s economic requirements.
Example:
- Actual CPA: €5
- Target CPA: €10
- Maximum economically viable CPA: €10
- Primary objective: additional conversion volume
In this case, intervention is not necessarily required. However, advertisers should expect the actual CPA to move more closely toward €10 in the future.
This option is particularly suitable if:
- the company wants to generate more volume,
- the target has been calculated accurately,
- additional conversions would be profitable,
- lead or revenue quality is measured reliably,
- sufficient capacity is available to process additional inquiries.
It is important not to treat previous performance as a guarantee. A CPA of €5 will not automatically remain in place simply because it was achieved over the past few months.
Option 2: Adjust the Target CPA or Target ROAS
If the aim is to largely preserve the current level of efficiency, the target can be adjusted.
Example:
- Previous target CPA: €10
- Actual CPA: €5
- Internal business target: €7
In this case, a target CPA of €7 would be more plausible than the previously specified €10. Following the Smart Bidding update, Google would optimize more strongly toward this new value.
Google has provided a “Bid Target Adjustment Tool” for this purpose since July 6, 2026. It allows advertisers to review affected campaigns and their historical performance. However, Google does not make the adjustments automatically. Advertisers must apply the suggested or individually determined values themselves.
The most recently achieved CPA should not simply be adopted as the new target without further analysis. Before making an adjustment, the following factors should be reviewed:
- Seasonal changes
- Conversion delays
- Promotional and discount periods
- Changes in competition
- The quality of different conversion actions
- Offline sales
- Margins and contribution margins
- Differences between new and existing customers
An extremely aggressive target CPA can also result in the campaign entering fewer auctions and no longer being able to spend its budget. A higher target ROAS can have the same effect. Although Google permits larger target changes, it recommends waiting for one or two full conversion cycles before making a final assessment of performance.
Option 3: Change the Smart Bidding Strategy
Another option is to switch:
- from target CPA to “Maximize Conversions”
- from target ROAS to “Maximize Conversion Value”
These strategies attempt to generate the greatest possible number of conversions or the greatest possible conversion value using the available budget.
They do not include a fixed CPA or ROAS guardrail. Google can use most or all of the daily budget, while actual efficiency may fluctuate more significantly.
This option may be suitable if:
- the budget represents a fixed upper limit,
- maximum volume is more important than a stable CPA,
- fluctuations are acceptable,
- sufficient conversion data is available,
- all relevant conversions are measured correctly.
For larger accounts, we would not rule out this option across the board, but we would assess it particularly carefully. The higher the budget, the greater the potential financial impact of not having a fixed efficiency target.
The strategy can quickly become a black box if many conversions are reported but their quality is unknown. For example, if newsletter sign-ups, contact form submissions, and qualified sales leads are treated as equally valuable, Google may concentrate the budget on the conversion that is easiest to achieve—not necessarily the one with the greatest economic value.
Smart Bidding Update: What Advertisers Should Do Now
All affected campaigns should undergo a structured review before August 17, 2026.
1. Identify Budget-Constrained Campaigns
Filter the Google Ads account for campaigns with the status “Limited by budget.”
Then check which of these campaigns use target CPA, target ROAS, or—in the case of Demand Gen—target CPC.
2. Compare Targets With Actual Performance
Compare the following for each campaign:
- Specified target CPA and actual CPA
- Specified target ROAS and actual ROAS
- Budget and actual spend
- Conversion volume and conversion value
Campaigns that significantly outperform their targets are particularly relevant.
3. Define the Real Business Objective
The target should not be derived solely from historical Google Ads data.
Instead, the following questions need to be answered:
- How much can the company afford to pay for a qualified lead?
- What ROAS is profitable after all costs?
- Is generating more volume more important than maintaining the current level of efficiency?
- Can the company process additional inquiries?
- Which conversion is genuinely valuable to the company?
4. Review Conversion Tracking
The Smart Bidding update makes clean conversion data even more important.
Review the following:
- Which actions are defined as primary conversions?
- Are soft micro-conversions used for bidding?
- Are conversion values set correctly?
- Are qualified leads and offline sales imported?
- Are any conversions being measured twice?
- Are Consent Mode and Enhanced Conversions working correctly?
- Are the conversion windows realistic?
Smart Bidding is only as good as the signals the system receives.
5. Document Changes and Evaluate Them Methodically
Any changes to targets or strategies should be documented. After a change, Google recommends waiting at least one or two conversion cycles before making a final assessment of performance.
Between August 17 and August 31, forecasts in planning and recommendation tools may also temporarily be less accurate as Google transitions these systems to the new behavior.
How WEVENTURE Is Preparing for the Smart Bidding Update
At WEVENTURE Performance, we do not view the update as merely a technical change in the Google Ads interface.
For the accounts we manage, we review:
- which campaigns are affected,
- how far actual performance differs from specified targets,
- which targets make economic sense,
- whether additional volume is wanted at all,
- how reliable the conversion data is,
- whether lead and revenue quality data is fed back to Google,
- what impact can be expected on Performance Max and Demand Gen.
The aim is not to automatically follow Google’s recommendations. Recommendations within a Google Ads account are based on the platform’s data and optimization logic. The company’s economic framework must be considered separately.
A target CPA should therefore not be determined solely on the basis of the previous 30 days. It should be derived from close rates, customer values, margins, and actual sales data.
Still have questions about target CPA and target ROAS?
Conclusion on the 2026 Google Smart Bidding Update
The Google Smart Bidding update is not a complete reinvention of automated bidding strategies. However, it changes how consistently Google optimizes budget-constrained campaigns toward their specified targets.
Starting August 17, 2026, campaigns that have previously performed significantly better than their target CPA or target ROAS may converge more strongly toward that target. CPA may increase, ROAS may decrease, and the distribution of budget and traffic may change.
In return, Google promises greater predictability when scaling. This is plausible in principle, but the change is probably not exclusively in the interests of advertisers. If the available margin within targets is used more fully, campaigns can enter more auctions and spend more advertising budget.
The most important conclusion is therefore:
The target set in Google Ads must reflect the actual business objective.
Anyone who specifies a target CPA of €10 should also be prepared to pay an average of €10 per conversion. A company that requires a ROAS of at least 700% should not allow Google to work with a target ROAS of 500% and assume that the campaign will continue to deliver 800% voluntarily.
Before changing bidding strategies too quickly, target values, conversion tracking, and profitability should be assessed together.
Are you unsure which of your campaigns are affected by the Smart Bidding update or which target CPA or target ROAS truly fits your business model? Our Google Ads team will help you analyze your campaigns, prepare your Google Ads account for the transition, and develop a bidding strategy that serves not only Google, but above all your business objectives.
Frequently Asked Questions About the Smart Bidding Update
When Does the Google Smart Bidding Update Take Effect?
The new bidding behavior takes effect on August 17, 2026. The Bid Target Adjustment Tool has been rolled out gradually to Google Ads accounts since July 6, 2026.
Will Google Increase My Budget as Part of the Smart Bidding Update?
No. Google will not automatically change either the daily or monthly budget or the target CPA or target ROAS. However, the available budget may be used differently, causing performance to move closer to the specified target.
Should I Reduce My Target CPA Before the Update?
Not necessarily. A reduction makes sense if the current target CPA is higher than the company’s actual economic target or if the aim is to preserve the current level of efficiency as much as possible. If the specified target is correct and additional volume is desired, it can remain unchanged.
Are Campaigns Without Budget Constraints Affected?
No. Target CPA and target ROAS campaigns that are not limited by budget are expected to retain their current behavior.
Is “Maximize Conversions” a Safe Alternative?
The strategy can generate the greatest possible number of conversions for a fixed budget, but it does not include a fixed CPA guardrail. The actual CPA can therefore fluctuate more significantly. It should only be used if conversion quality, budget, and financial impact can be monitored reliably.
