Google is changing Smart Bidding behavior for budget-limited campaigns starting August 17, 2026.
If your Target CPA or Target ROAS campaigns consistently exhaust their daily budget, this change directly affects your conversion volume.
The Current Behavior
Smart Bidding currently over-delivers in budget-constrained campaigns.
When your Target CPA is $50 but the algorithm achieves conversions at $30, it keeps bidding at $30 — maximizing conversions while staying under budget.
This over-delivery is deliberate: the algorithm finds the most efficient price within your budget constraint.
What Changes August 17
After August 17, the algorithm will bid closer to your stated $50 target instead of the efficient $30 rate.
Impact calculation: $1,000/day budget, Target CPA $50, current Avg. CPA $30.
- Now: approximately 33 conversions/day
- After August 17: approximately 20 conversions/day
- Same budget, 40% fewer conversions
Who Is Not Affected
- Campaigns with remaining daily budget (not budget-limited)
- Maximize Conversions without a Target CPA cap
- Target Impression Share campaigns
Only campaigns showing the "Limited by budget" status with Target CPA or ROAS are affected.
The Fix
Use the Bid Target Adjustment Tool: Google Ads > Tools > Bid strategies > Advanced controls.
This tool shows each campaign's Target CPA vs Avg. CPA gap and recommends adjusted targets.
Lower Target CPA to match actual performance. Complete by August 10 — the algorithm needs one week to adapt before August 17.
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