Google Ads Is Changing How Target-Based Bidding Works for Budget-Limited Campaigns

From 17 August 2026, Google will update its bidding systems so that budget-limited campaigns using Target CPA or Target ROAS deliver more consistently toward the targets advertisers have actually set.

What’s Changing in Google Bidding Systems? 

After 17 August, Google’s bidding systems are set to alter the performance of “Limited by budget” and target-based bid campaigns. These updates mean Google will optimise more tightly toward users’ stated targets 

The update applies to Search, Shopping, Performance Max, Demand Gen, and Travel campaigns, while Display and Hotel campaigns already use the new bidding behaviour. 

Why Google Bid Management Changes Matter 

Until now, campaigns flagged as “Limited by budget” that use a target-based bid strategy (Target CPA, Target ROAS, or Target CPC for Demand Gen) have often outperformed their stated targets. A campaign with a Target CPA of €10, for instance, might deliver conversions at €5.  

However, with Google’s updates, if your budget-limited campaign has been overperforming, it will begin trending back toward the stated target. 

What does this mean for advertisers? 

What Steps Does Google Recommend Marketers Take? 

Google will not automatically adjust your targets or budgets. Consequently, there’s a few things to consider: 

• Review budget-limited campaigns: Filter for campaigns with a “Limited by budget” status that use a target-based strategy. Focus on those where actual performance is significantly better than the stated target. 
• Use the Bid Target Adjustment Tool: Available from 6 July, this tool surfaces historical performance data and lets you update targets quickly. If your Target CPA is €10 but you’ve been achieving €5, you can lower the target to match this or pick a custom figure that aligns with your business goals. 
• Consider switching strategies: For campaigns where volume matters more than efficiency, switching to Maximise Conversions or Maximise Conversion Value removes the target constraint entirely. However, keep in mind that actual CPA or ROAS will fluctuate more freely with these strategies. 

The bigger picture for PPC teams 

This update presents a major shift in Smart Bidding behaviour. Campaigns that have been running on autopilot with outdated targets are the most exposed. If a target was set at launch and never revisited, now is the time to check whether it still reflects your actual margin requirements. 

For multi-channel campaigns like Performance Max and Demand Gen, there’s an additional consideration: traffic distribution across channels may shift as the system realigns to your stated targets. Keep an eye on channel-level reporting in the weeks following the rollout. 

Google also notes that Performance Planner forecasts may be less accurate during the transition period from 17 August to 31 August, so it’s worth exercising caution with any projections during that window. 

What Peak Ace Recommends 

The practical takeaway is straightforward: audit your budget-limited campaigns now, ensure that your campaigns are being fed high-quality conversion signals, or let campaigns run to their set targets, and make the adjustment before 17 August. 

Waiting until after the rollout means accepting whatever the system delivers at your existing target. For many accounts that could mean a noticeable shift in CPA or ROAS. 

If you’re unsure where to start or want a second pair of eyes on your bidding setup, Peak Ace’s Paid Search team can help you navigate the transition and make sure your campaigns are positioned to perform. 

FAQ: Google Ads Target Based Bidding 

What’s changing with Google Ads bidding on 17 August 2026? 

Google is updating its bidding systems so that budget-limited campaigns using Target CPA, Target ROAS, or Target CPC will optimise more tightly toward the targets advertisers have actually set – rather than outperforming them as they often do today. 

Which campaign types are affected? 

The update applies to Search, Shopping, Performance Max, Demand Gen, and Travel campaigns. Display and Hotel campaigns already use the new bidding behaviour. 

Why have my Google Ads campaigns been outperforming their targets? 

Until now, campaigns flagged as “Limited by budget” with a target-based bid strategy have often delivered results significantly better than the stated target. For example, a campaign with a Target CPA of €10 might have been achieving conversions at €5. After the update, performance will trend back toward the stated target. 

Will Google automatically adjust my targets or budgets? 

No. Google won’t make any automatic changes to targets or budgets. Advertisers need to review and update these themselves before 17 August. 

What’s the Bid Target Adjustment Tool? 

Available from 6 July 2026, this tool surfaces historical performance data and lets advertisers update their targets quickly. It’s designed to help align stated targets with actual performance. 

Should I switch my Google Ads bidding strategy? 

It depends on the campaign’s goals. For campaigns where volume matters more than efficiency, switching to Maximise Conversions or Maximise Conversion Value removes the target constraint entirely. However, actual CPA or ROAS will fluctuate more freely with these strategies. 

How might Performance Max and Demand Gen campaigns be affected? 

For multi-channel campaigns, traffic distribution across channels may shift as the system realigns to stated targets. It’s worth keeping a close eye on channel-level reporting in the weeks following the rollout. 

Will Performance Planner forecasts still be accurate? 

Google has noted that Performance Planner forecasts may be less accurate during the transition period from 17 August to 31 August, so it’s best to exercise caution with projections during that window.