Google is changing Smart Bidding behavior for budget-limited campaigns starting August 17, 2026. US advertisers running Target CPA or Target ROAS campaigns that consistently hit their daily budget ceiling need to act before this date or face a significant drop in conversion volume.
What Is Changing
Smart Bidding currently over-delivers in budget-limited campaigns. If you set Target CPA at $50 but the algorithm achieves conversions at $30, it keeps bidding at $30 and maximizes your conversion count. After August 17, it will bid at your stated $50 target instead.
Result for a $1,000/day campaign: 33 conversions at $30 CPA drops to 20 conversions at $50 CPA. Same budget, 40% fewer results.
Who Is Affected in US Accounts
US campaigns tend to have higher CPCs and more competitive auctions. Many accounts set conservative Target CPAs that the algorithm has been beating consistently. These campaigns are most at risk.
Budget-limited campaigns (blue dollar sign icon in Google Ads) using Target CPA or Target ROAS where actual performance is significantly better than the stated target will see the biggest impact.
Non-budget-limited campaigns and campaigns using Maximize Conversions without a CPA cap are not directly affected.
4 Steps Before August 17
Step 1: Identify budget-limited campaigns in your account. Go to Campaigns > filter by "Limited by budget" status.
Step 2: Compare Target CPA to Avg. CPA column. If Avg. CPA is meaningfully below Target CPA, this campaign is over-delivering.
Step 3: Use the Bid Target Adjustment Tool at Tools > Bid strategies > Advanced controls. Google shows recommended adjusted targets based on your historical data.
Step 4: Lower your Target CPA to match actual performance. If actual CPA has been $32, set target to $32 or $35. Complete this by August 10 to allow one week of learning before the deadline.
For US Google Ads Accounts
In competitive US markets like legal, finance, insurance, and SaaS, CPAs vary significantly by campaign. Run this audit separately for each campaign rather than applying account-level changes.
If increasing budget is an option, removing the budget constraint eliminates the exposure to this change entirely.
More Google Ads strategy guides for US campaigns: https://yositeup.com/en-us/
