Why it matters
After 17 August, a stale CPA or ROAS target can actively trade efficiency for scale. Senior marketers need to decide whether that gap is approved growth or hidden margin.
01 · Read the boundary
The update is narrow, but the commercial effect can be large.
Google says that after 17 August 2026, campaigns marked “Limited by budget” and using target-based bidding will optimize more consistently toward the target entered, including when budgets change. The affected strategies are Target CPA and Target ROAS across Search, Shopping, Performance Max, Demand Gen and Travel, plus Target CPC for Demand Gen. The change also reaches Search Ads 360 and, for Demand Gen, Display & Video 360.
It does not change the auction, and it does not change target-based campaigns that are not budget constrained. App campaigns, Video reach campaigns and Video view campaigns keep the previous behaviour; Google says Hotel and Display already use the new behaviour. That distinction matters. This is not a reason to reset every account. It is a reason to identify the campaigns where budget pressure and an old target currently coexist.
Google’s own example is unusually direct. A campaign with a $10 Target CPA that has recently delivered a $5 actual CPA may move closer to $10 after the update if the target is left unchanged. Google will not automatically change the target or budget. The platform is effectively saying that the number entered will carry more operational weight than the efficiency the campaign happened to produce while constrained.
02 · Price the gap
A stale target is permission to spend the efficiency surplus.
Many teams treat a CPA target as a ceiling and a ROAS target as a floor. If the campaign beats that line, the gap is recorded as outperformance. Under the new behaviour, a budget-constrained campaign can use more of that gap to find additional volume. A $10 Target CPA paired with a $5 actual CPA is not merely a reporting mismatch; it can be interpreted as permission to acquire the next conversion closer to $10.
That can be the right decision. If $10 is genuinely profitable, conversion quality is stable and the business wants more volume, stronger delivery toward the stated target may make scaling more predictable. The problem is not the algorithm using the target. The problem is a target that was set for an old margin, an old conversion definition or an old growth plan and then left in place because actual performance looked better.
My inference is that bid targets now need the same ownership as pricing or inventory constraints. Media should not lower a ROAS target or relax a CPA target simply because a platform recommendation predicts more conversions. Finance or the commercial owner should define the acceptable unit economics, analytics should confirm which conversion value the system sees, and media should translate that decision into the target. The setting is becoming an operating contract, not a dashboard preference.
03 · Protect interpretation
More predictable bidding can still produce less predictable reporting.
Google notes that Performance Max and Demand Gen may shift traffic across channels as the system moves toward the target. The FAQ also says the update affects the conversion types used by eligible campaigns, including click-through, view-through and engaged-view conversions where applicable. A stable headline CPA can therefore hide a different mix of inventory, interactions and credited outcomes.
The transition window deserves special care. Google says planning tools such as Performance Planner will be updated, but forecasts may be inaccurate from 17 to 31 August. It also recommends waiting one to two conversion cycles before evaluating performance after a target or budget change. That makes a rapid sequence of target edits, budget increases, creative changes and landing-page tests particularly difficult to interpret.
I would separate platform delivery from business acceptance. Monitor actual CPA or ROAS, spend and conversion volume, but also review conversion mix, new-customer quality, margin, cancellation or return signals, and channel distribution where the campaign spans surfaces. The platform can tell you whether it delivered toward the target. It cannot decide whether the target still represents the outcome the business intended to buy.
A campaign can move closer to its platform target while the economics or credited conversion mix move in the wrong direction.
04 · Run the gate
Use the deadline to reset ownership, not just settings.
Start with an account-level inventory of campaigns that are currently limited by budget—or were limited during the past year—and use Target CPA, Target ROAS or the affected Demand Gen Target CPC. Google’s Bid Target Adjustment Tool has been rolling out since 6 July, but the absence of a recommendation is not proof that a campaign is unaffected. Google says recommendations may be missing when recent data is insufficient, including campaigns with fewer than seven conversions.
For each candidate, record the current target, recent actual performance, conversion delay, budget utilization and the commercial threshold the business would approve today. Then choose deliberately: keep the target because it represents the desired economics; align it to recent performance to protect current efficiency; enter a custom target; change strategy; or add budget because the target and unit economics justify more scale. Do not treat “Apply” as the decision itself.
After the change, stage material adjustments and observe for at least one to two conversion cycles. For multi-channel campaigns, annotate the date and check whether channel and conversion composition moved with the headline result. The opportunity is real: a more consistent relationship between target and scale should make planning easier. It only becomes an advantage when the target is current, economically owned and measured beyond the platform total.
What marketers should do next
Turn the signal into a better decision.
- Export campaigns that are limited by budget and use Target CPA, Target ROAS or Demand Gen Target CPC; include campaigns limited at any point in the past 12 months.
- Compare each stated target with recent actual performance, conversion delay and the margin or value threshold the business would approve today.
- Assign one decision owner for every material gap: protect current efficiency, choose a custom target, keep the existing target for scale, change strategy or add budget.
- Annotate changes made before and after 17 August, and avoid stacking unrelated budget, creative and landing-page changes during the initial observation window.
- Evaluate after one to two conversion cycles using conversion quality, margin and channel mix alongside Google Ads CPA, ROAS, spend and volume.
Sources & further reading
01Google Ads Help — Changes to target-based bid strategies02Google Ads Help — Frequently asked questions about the changes03Google Ads Help — About Target CPA bidding04Google Ads Help — About Target ROAS bidding