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By David Bogder
Google Ads is changing how target-based bidding works for campaigns marked “Limited by budget.” Starting August 17, 2026, affected campaigns will aim more consistently at the Target CPA or Target ROAS set by the advertiser, even when budgets change. Target CPC is also included for Demand Gen campaigns.
For advertisers that test and scale with tight budgets, this should be useful. Budget increases should be less likely to cause unexpected swings in efficiency. However, a campaign that is outperforming a loose target today could become less efficient once the new behavior takes effect.
What is changing?
Target CPA and Target ROAS are average efficiency goals, not hard limits on individual auctions. Target CPA tells Google to generate as many conversions as possible while trying to average the CPA entered by the advertiser. Target ROAS tells Google to maximize conversion value while trying to average the stated return.
Google adjusts bids for each auction based on the predicted likelihood and value of a conversion. A higher Target CPA allows higher bids or traffic with a higher predicted acquisition cost. A looser Target ROAS allows opportunities with a lower predicted return. Both can still meet the stated target while being less efficient than the traffic captured today.
Google says budget-limited campaigns can currently perform better than their targets. It has not disclosed the exact reason or algorithm change. Our interpretation is that the budget constraint acts as an additional filter. When demand exceeds the available budget, the system may concentrate spend on the auctions it predicts will be most efficient.
After August 17, these campaigns will bid more consistently toward the stated target. A campaign with a $10 Target CPA and a recent actual CPA of $5 could begin moving closer to $10. Because $10 is the average goal, Google can pursue conversions expected to cost more than $5 while still meeting the target. The likely effect is more aggressive bids, a different traffic mix, or both.
This does not necessarily mean Google will pay more for the exact same traffic. The mix of auctions, bids, traffic, and conversion volume may change. Google has only confirmed that the resulting average performance will move closer to the target.
The same applies to Target ROAS. A campaign with a 500% target that is delivering 700% can pursue opportunities expected to return less than 700% while still meeting the 500% goal. That may create more room to scale, but it can also pull average ROAS down toward the target. To preserve the 700% return, the advertiser would need to raise the target. Google will not make these adjustments automatically.
Why this is a positive change
Many advertisers start with a controlled budget and add funding once a campaign proves it can meet the required CPA or ROAS. Today, increasing the budget on a constrained campaign can also change its effective efficiency threshold, making profitable growth harder to forecast.
Under the new behavior, a properly set target should remain a more reliable guide as the budget changes. This should help any advertiser that needs to scale in stages.
It is important to distinguish between a low-budget campaign and one that is limited by budget. Google is changing the latter. A campaign can have a small budget without being constrained if demand is low. A high-spend campaign can still be limited by budget if demand exceeds the amount available. Google says target-based campaigns that are not budget-constrained will not be affected.
More predictable does not mean more efficient
This update does not automatically improve CPA, ROAS, lead quality, or conversion volume. It does not create demand, add conversion data, or fix poor tracking.
Some advertisers may see worse efficiency. If a campaign has been beating its target because of the budget constraint, performance may move toward the less efficient target after August 17.
Targets now need to be treated as real business instructions. Target CPA should represent a cost the business can afford, while Target ROAS should reflect the return required for profitable growth.
This is especially important for B2B advertisers. If a campaign is optimizing toward every form submission, a very short phone call, or another weak indicator of lead quality, more consistent bidding will not improve the business result. It may simply help Google deliver the wrong type of conversion more consistently.
What advertisers should do before August 17
1. Find the affected campaigns
Start with campaigns using Target CPA or Target ROAS that are currently, or have recently been, limited by budget. The update applies to Search, Shopping, Performance Max, Demand Gen, and Travel campaigns. Target CPC is also affected for Demand Gen.
2. Compare targets with actual performance
Look for campaigns where actual CPA is well below Target CPA or actual ROAS is well above Target ROAS. Those campaigns are the most likely to shift.
This is especially important for B2B advertisers. Historically, advertisers could tinker with targets to achieve their ideal targets, but this will likely no-longer be advised. Setting your true target will lead to the most consistent performance. If a campaign is optimizing toward every form submission, a very short phone call, or another weak indicator of lead quality, more adjustments will not improve the business result. It may simply help Google deliver the wrong type of conversion more consistently.
3. Decide what the campaign should prioritize
If preserving current efficiency is the priority, adjust the target to reflect current performance. If the existing target represents a result the business can accept, keeping it may provide more room to scale.
Advertisers with a fixed budget can also consider Maximize Conversions or Maximize Conversion Value without a target, although CPA or ROAS may fluctuate.
4. Check the conversion data
Confirm that bidding is based on meaningful outcomes and accurate values. Lead-generation advertisers should consider passing qualified-lead, opportunity, or revenue data into Google Ads instead of treating every inquiry as equally valuable.
5. Monitor the rollout
Google recommends waiting one to two conversion cycles before evaluating performance after a target or budget change. Monitor spend, conversion volume, CPA or ROAS, lead quality, and any shifts in channel allocation for Performance Max or Demand Gen.
LQ Digital’s POV
This is a predictability update, not a performance upgrade.
Google is giving advertisers clearer control over the relationship between budget and efficiency. In return, advertisers need to be more deliberate about the targets they set. Accounts with reliable conversion data and targets grounded in unit economics should become easier to scale. Accounts using loose targets may see performance move toward those looser goals.
Before August 17, review every budget-constrained campaign using a target-based strategy. Do not assume that recent overperformance will continue if the target has not been updated.
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