Google is changing how Smart Bidding behaves in budget-limited campaigns. The change takes effect on August 17, 2026. If your campaigns regularly hit their daily budget ceiling, this update will directly affect your conversion volume and cost efficiency.
Here is what is changing, which accounts are affected, and the exact steps to take before the deadline.
What Smart Bidding Is Changing on August 17
Currently, Smart Bidding in budget-limited campaigns operates with a form of efficiency that most advertisers do not notice. If your Target CPA is set to $50 but the algorithm consistently finds conversions at $30, it continues bidding at $30 and over-delivers on your target. You get more conversions per dollar than your target implied.
After August 17, this changes. Smart Bidding will begin bidding closer to the target you actually set, rather than the more efficient rate it has been achieving. The algorithm will no longer compress bids below your stated target to maximize conversion volume.
The practical impact: a campaign with a $1,000 daily budget and a Target CPA of $50, currently converting at $30 actual CPA, will shift from approximately 33 conversions per day to approximately 20 conversions per day - the same budget, fewer results.
This only affects campaigns that are budget-limited (spending all of their daily budget before the day ends). Campaigns with remaining budget headroom are not directly impacted.
Which Campaigns Are Affected
The change applies to campaigns that meet both of these conditions:
First, the campaign is budget-limited. In Google Ads, a budget-limited campaign shows a blue dollar sign icon. The campaign spends its full daily budget every day.
Second, the campaign uses Target CPA or Target ROAS bidding, and the actual performance is significantly better than the stated target. If your actual CPA is notably lower than your Target CPA, or your actual ROAS is notably higher than your Target ROAS, the campaign has been over-delivering.
Campaigns that are NOT budget-limited will not see meaningful changes. If your campaign has remaining budget at end of day, the algorithm's behavior stays essentially the same.
How to Check Your Campaigns Before August 17
Google released the Bid Target Adjustment Tool on July 6, 2026, specifically to help advertisers prepare for this change. Access it through: Google Ads > Tools > Bid strategies > Advanced controls.
The tool shows each campaign's current target versus actual performance and flags where a significant gap exists. It also suggests adjusted target values that reflect reality rather than the outdated stated target.
To audit manually without the tool:
Step 1. In Google Ads, open the Campaigns tab. Add a column for "Budget limit" or filter by status to identify which campaigns are budget-constrained.
Step 2. For each budget-limited campaign, compare Target CPA (the value you set) to Avg. CPA (what the algorithm is actually achieving). If Avg. CPA is significantly below Target CPA, this campaign is over-delivering.
Step 3. For Target ROAS campaigns, compare your set ROAS target to actual ROAS. If actual ROAS is significantly above your target, the same over-delivery is happening.
Step 4. Calculate the conversion volume difference. If your actual CPA is $30 and your target is $50, expect approximately 40% fewer conversions after August 17 at the same budget.
What to Do Before August 17
If your campaigns are over-delivering (actual performance is significantly better than your stated target), you have two options.
Option A: Lower your Target CPA (or lower your Target ROAS) to match actual performance. If your actual CPA has been $30 while your target was $50, set the target to $30 or $35. This instructs Smart Bidding to continue operating at the efficiency level it has been achieving, and the behavior change on August 17 will have minimal impact.
Option B: Increase your daily budget. If you increase the budget so the campaign is no longer budget-limited, the algorithm retains full flexibility and the August 17 change does not directly apply.
For most accounts, Option A is the faster and lower-risk path. Use the Bid Target Adjustment Tool to get Google's suggested target values based on your historical data, then apply them two to three weeks before August 17 to allow the algorithm to adjust.
Do not wait until August 17. Changing targets on the deadline date itself creates a disruption without a learning period buffer.
Campaigns That Don't Need Action
Not every campaign requires changes. Skip the audit for campaigns that:
- Are not budget-limited (still have remaining budget at end of day)
- Have actual CPA close to or above Target CPA (actual performance matches or underperforms the target)
- Use Maximize Conversions or Maximize Conversion Value bidding without a target constraint
The change is specifically about the gap between stated targets and actual over-performance in budget-constrained campaigns. If no gap exists, no action is needed.
Timeline
July 6, 2026: Bid Target Adjustment Tool became available in Google Ads. August 17, 2026: Smart Bidding begins enforcing targets more strictly in budget-limited campaigns. Recommended action deadline: complete target adjustments by August 10 to allow one week of algorithm learning before the change takes effect.
More Google Ads guides and Google Ads strategy updates: https://yositeup.com
