Google Ads Is Changing Smart Bidding on August 17. Here’s How to Protect Your Account.

Google is implementing a major change to how its Smart Bidding systems handle campaigns that are “Limited by budget”.

Historically, if a campaign was budget-constrained, Google’s algorithm would often implicitly optimize for maximum efficiency, sometimes drastically overperforming your stated targets (e.g., achieving a $5 Cost-Per-Acquisition [CPA] even though your set Target CPA was $10). Starting August 17, 2026, that dynamic disappears. Google will force budget-limited campaigns to optimize directly toward your stated targets, meaning your actual CPAs will likely drift upward to match whatever number you typed into the settings.

Here is what this means for your account, your portfolio bidding strategies, and how to protect high-CPC niches like personal injury law firms.

1. What Happens to Your Google Ads Account

If you do nothing, Google will not automatically change your targets or budgets. Instead, the backend machine learning shifts. Any campaign that has been quietly beating its targets will face performance volatility and a spike in costs per conversion as the algorithm aggressively loosens its internal constraints to match your higher stated target.

Impact on Portfolio Bidding & Max CPC Caps

The update explicitly applies to portfolio bidding and shared budget setups.

• The Portfolio Conflict: If you have a Portfolio Target CPA strategy containing multiple campaigns, any changes to align targets must be done at the overall portfolio level, not individual campaign levels. If only one or two campaigns in that portfolio are “Limited by budget,” those specific campaigns will start shifting their internal bidding aggressively to pull the overall portfolio’s actual CPA up to the target.
• The Max CPC Safety Net: Many advanced advertisers utilize a Maximum CPC limit inside their Portfolio Target CPA settings to prevent Google from spending absurd amounts on a single click. This cap remains your ultimate shield. While Google’s algorithm will try to bid higher to reach your Target CPA on budget-limited campaigns, it cannot breach your portfolio’s Max CPC cap. However, because the algorithm is hungrier to spend up to the target, it will likely max out that CPC cap far more frequently across your daily budget.

2. The Playbook for Non-Branded Campaigns

Non-branded campaigns are highly susceptible to this update because they naturally have more volatile auction environments and wider gaps between the target set and actual performance.

• Audit using the Bid Target Adjustment Tool: This tool rolled out on July 6, 2026. Look for account notifications detailing which non-branded campaigns are flagged as budget-limited.
• Lower Targets to Match Reality: If a non-branded campaign has a Target CPA of $150 but has historically been pulling in conversions at $90, you can use the tool to manually lower the stated Target CPA to $90 before August 17. This locks in your current efficiency.
• Pivot to Pure Maximize Strategies: If you don’t want to micromanage the targets, Google allows you to switch the campaign to a straight Maximize Conversions strategy (removing the target constraint completely) so the algorithm simply focuses on getting the most volume out of the restricted budget. However, this also restrict your ability to add a maximum CPC cap for your portfolio bidding strategy. For most accounts, maximize conversion bidding does not allow the advanced setting to cap your CPC. Check this setting before making this change.

3. The High-CPC Threat: California Personal Injury Law Firms

In hyper-competitive, high-CPC verticals like legal marketing, this change can quickly drain budgets if left unchecked.

The California Law Firm Scenario:

Imagine a personal injury law firm in Los Angeles bidding on “car accident lawyer” keywords, where CPCs easily sit at $500 per click.

Because legal conversion rates from click-to-lead can be low, the firm sets an arbitrary, high Target CPA of $2,000 in their portfolio to ensure they enter the top auctions. Historically, Google’s algorithm might have been budget-constrained but highly selective, filtering for the best intent and actually delivering a $1,000 actual CPA.

On August 17: If that campaign remains “Limited by Budget” with a $2,000 target, Google’s system will stop being selective. It will bid more aggressively on borderline queries and broader intents just to force the actual CPA up to the $2,000 target. At $500 a click, just a few untargeted clicks will instantly vaporize a $3,000 daily budget with zero phone calls to show for it.

How to Avoid Overspending in High-CPC Categories

To protect your law firm or high-ticket lead generation accounts from overspending after August 17, use this workflow:

1. Tighten the Portfolio Max CPC Cap: Review your portfolio settings. If your average CPC is $500, ensure your hard Max CPC cap is set to exactly what you are comfortable paying (e.g., $550). Do not leave it uncapped, or the algorithm may spike bids to $800+ in an attempt to hit the target CPA.
2. Step Down the Target CPA: Use the Bid Target Adjustment Tool to lower the Target CPA to match the actual historical CPA (change it from $2,000 to $1,000 in the scenario above). This signals the algorithm to maintain its strict filtering and bidding discipline.
3. Strategically Increase Budgets on Highly Profitable Campaigns: The safest way to bypass the risks of this update is to clear the “Limited by budget” status. If a campaign is highly profitable at its current actual CPA, strategically increase the daily budget to sit slightly above its historical peak daily spend. This clears the budget constraint safely without leaving your spending unchecked, ensuring this specific algorithmic shift no longer applies.
4. Restructure Campaigns by Keyword Intent: Separate your traditional regional campaigns into two distinct buckets: high-intent and low-intent keywords. If you mix your $500 premium keywords (like “car accident lawyer”) with research terms (like “whiplash settlement”) in a budget-limited campaign, the new algorithm will aggressively dump your budget into the cheaper research terms just to inflate conversion volume and hit your stated target. Separating them into isolated intent-based campaigns ensures Google can never dilute or starve out your highest-value lead sources.

Don’t wait for August 17 to watch your ad spend spike. Let us lock in your performance before the algorithm shifts.