Since 17 August 2026, Google Ads has changed how automated bidding behaves for budget-limited campaigns. If you run target CPA or target ROAS on Search, Shopping, Performance Max or Demand Gen, your real costs may already be drifting, with no action needed on your side to trigger it.
1. What actually changes
Before 17 August, a target CPA or target ROAS campaign limited by its budget could significantly beat its target: the algorithm concentrated spend on the most efficient auctions. A target CPA set at €10 could run at a real €5. Since 17 August, Google pulls real performance toward the target you entered, including when you adjust budgets. Without action, that same €5 CPA gradually climbs back toward €10.
This affects Search, Shopping, Performance Max, Demand Gen (including its target CPC) and Travel campaigns. Display and Hotel already worked this way. App campaigns and video campaigns are unchanged.
2. Why Google is making this change
The stated goal is predictability. Before this update, raising the budget on a strong-performing campaign often triggered hard-to-anticipate swings: CPA drifting, erratic volume, unexpected channel shifts on Performance Max. With the new behaviour, a well-calibrated campaign can scale its budget without performance degrading unpredictably.
3. The risk if you do nothing
Google will not automatically adjust your targets or budgets. Inaction has a direct cost: if your real CPA is well below your target, it will drift up toward that target; if your real ROAS is well above its target, it will drift down toward it. For lead generation, that can mean more volume but pricier leads, a problem if your target no longer reflects your profitable acquisition cost. The timing matters: budget-limited campaigns tend to multiply right before Q4 (Black Friday, year-end sales).
4. What to check this week
A bid target adjustment tool has been available in Google Ads since 6 July 2026 (the "Review your campaign targets" notification). Campaign by campaign, it lets you keep the current target, align it to recent performance, set a custom in-between target, or switch bidding strategy. That choice should not be automatic: it depends on your real margin, not the default "Apply" button the tool suggests.
The AI lens, humans first
Google's Smart Bidding is an algorithm that faithfully executes whatever target you feed it. It has no idea of your margin, the real value of a lead, or your profitability threshold: it optimises toward the number you entered, full stop. This change makes that reality more visible than ever: the quality of your target now matters more than the power of the algorithm. AI executes. Expertise decides, and sets the right number from your business data, not from a platform default.
This week
Review your budget-limited campaigns from the past 12 months. Compare target versus real performance for each one. Decide based on your real margin, not the default "Apply" button, before Q4 arrives.
At Vistalaro, paid campaign management (Vistalaro Reach) builds this kind of arbitration into ongoing steering, not into after-the-fact reaction. Bid targets are set from your real economics, margin, customer value, and recalibrated with strategic guidance (Vistalaro Pilot), so automation serves your profitability, not the other way round.
Are your bid targets still the right ones?
Let's check them together, without jargon, so you head into Q4 without a cost surprise.
Let's talk