The Silver Lining of August 17: How Google’s Bidding Change Solves Budget Scaling Fluctuations

By Noa Amit - Tuesday August 18, 2026 Share (Twitter) WhatsApp Summarize ChatGPT Perplexity Grok Google AI Every PPC manager knows the specific anxiety of scaling a winning campaign. A campaign is capped at $100 a day. Its target CPA is set to $50, but Smart Bidding has settled at a pristine $35.

Clients are happy, leadership is impressed, and the natural next step is obvious: increase the budget. So the daily limit is raised to $500, and managers watch in real time as performance destabilizes, the algorithm loses its footing, and the actual CPA skyrockets past the $50 target.

For years, budget-limited campaigns using target-based bid strategies (Target CPA and Target ROAS) treated daily budgets as an artificial efficiency throttle. When the budget valve is opened, the algorithm’s bidding mechanics shift unpredictably.

Starting August 17, 2026, as mentioned in Google’s official documentation, Google is permanently changing this behavior. While much of the initial reaction in the PPC community has focused on lost “cheap conversions,” there is a massive strategic upside: Google is uncoupling the budget lever from the efficiency lever.

Here is what is actually changing under the hood, why it makes account scaling far more predictable, and how to prepare campaigns before the deadline. The Historical Flaw: Why Scaling Budgets Used to Break Campaigns To understand why August 17 is a long-term win, PPC managers have to look at how Smart Bidding previously handled budget-constrained campaigns.

Historically, if a campaign was marked “Limited by budget,” Smart Bidding didn’t just cap spend. It aggressively restricted its bidding behavior to capture only the absolute cheapest, highest-intent conversions available within that tight dollar limit. This creates a misleading baseline.

A campaign with a $50 target CPA that delivers $35 CPA is not necessarily “overperforming”; it is mainly buying a small, capped slice of the inventory, since the capped budget was avoiding using it in any other inventory.

The issue is, once you increase this campaign budget and unlock more inventory, the smart bidding is forced to suddenly re-evaluate broader auction pools, which is not part of the campaign initial learning; this resulted in CPA spikes and performance instability, and also extended the re-learning period.

The August 17 Shift- Disconnecting budget and efficiency After August 17, Google is forcing Smart Bidding to optimize strictly toward the target sitting in the box, regardless of whether the campaign is budget-constrained or fully funded.

Google’s official documentation illustrates this clearly: if a campaign has a $10 Target CPA but recent actual performance is $5, the post-August 17 algorithm will deliver closer to $10. At first glance, that sounds like an efficiency penalty. In reality, it is a stabilization fix. How is Google doing that?

By separating the connection between efficiency and budget: The Bid Target dictates efficiency and margin. The Daily Budget dictates the volume ceiling. When these two levers operate independently, scaling becomes linear.

If the team increases the budget on a campaign that is locked into a $35 target, the algorithm will capture more volume at that $35 target, rather than wildly shifting its bidding parameters trying to figure out what efficiency level the team actually wanted. So, which campaigns will be impacted?

Not every campaign on an account operates under these new rules. Understanding where the boundaries lie ensures the team’s audit focuses on the right structures.

Campaign Type / Category Bidding Strategies Impacted Post-August 17 Behavior Search, Shopping, Performance Max, Demand Gen, Travel Target CPA, Target ROAS, Target CPC (Demand Gen) Changes: Will strictly deliver toward the stated target, eliminating budget-cap overperformance.

Display & Hotel Target CPA, Target ROAS No Change: Already operate under this strict target behavior. App Campaigns, Video Reach, Video View (VVC) Target CPA, Target ROAS / Cost-Per-View Retain historical bidding behavior. Manual Bidding, Max Conversions, Max Value Manual CPC, Target Impression Share Unaffected by target-based bidding changes.

How to prepare? Finding the silver lining Yeah, I know this is a cliché, but I can’t help looking at the bright side; after years of carefully tweaking scale so we wouldn’t hurt performance, knowing we can rely on more stable results while scaling is also actually a big growth opportunity.

However, because Google will not automatically adjust bid targets, doing nothing is an active choice to let the CPAs trend upward toward whatever legacy numbers are sitting in the settings. So, if you want to turn this update into a scaling opportunity, follow this four-step transition framework using Google’s Bid Target Adjustment Tool (a