Google Ads has started rolling out an important change to its automated bidding system that could affect advertisers running campaigns with limited budgets.
Starting August 17, 2026, Google Ads is changing how campaigns marked as “Limited by budget” perform when they use target-based bidding strategies. The main goal is to make campaign results more consistent with the targets advertisers actually set.
The update mainly affects campaigns using Target CPA and Target ROAS. Target CPC is also included for Demand Gen campaigns.
Until now, some campaigns limited by budget could perform much better than their set target. For example, an advertiser might set a Target CPA of $10 while the campaign actually generates conversions for around $5 each.
Under the new system, Google Ads will try to bring campaign performance closer to the advertiser’s stated $10 target. This means businesses that were receiving conversions at a much lower cost than their target could notice changes in cost, traffic and conversion volume as the update rolls out.
This does not mean Google is automatically increasing advertising budgets. Daily and monthly budget limits will still apply, and Google will not automatically change an advertiser’s Target CPA, Target ROAS or campaign budget.
Instead, the change is designed to make automated bidding more predictable when advertisers increase or decrease their budgets.
For marketers, this makes the target entered into Google Ads more important than before. A Target CPA or Target ROAS should not simply be treated as a loose guideline. Advertisers should make sure their bidding targets reflect the performance marketing and profitability they actually want.
Google Ads has also introduced a Bid Target Adjustment Tool that allows advertisers to review affected campaigns and change their targets more easily.
Businesses should pay particular attention to campaigns that are both “Limited by budget” and performing significantly better than their current targets. If the existing target no longer matches the company’s real acquisition cost or return goals, leaving it unchanged could lead to different performance after the update.
The change covers several major Google Ads campaign types, including Search, Shopping, Performance Max, Demand Gen and Travel campaigns.
Advertisers may also notice temporary performance or traffic fluctuations while the new bidding behavior is being introduced. Because the rollout is gradual, not every account or campaign may show the change at exactly the same time.
For businesses focused on measurable growth, the August 17 update is another reason to regularly review campaign targets instead of relying entirely on automation. Automated bidding can make campaign management easier, but the system still depends on the goals, conversion data and targets provided by the advertiser.
The key takeaway is simple: businesses running budget-limited Google Ads campaigns should review their Target CPA and Target ROAS settings and make sure those numbers represent the results they genuinely want.
As Google continues making advertising more automated, accurate conversion tracking, realistic targets and careful performance analysis will become even more important. For marketers and agencies, understanding how these changes affect cost and conversion volume can help prevent wasted spend while creating more predictable opportunities to scale.