Google is redefining what a bid target means, and the change lands on every budget-limited Search, Shopping, Performance Max, Demand Gen and Display campaign running Target CPA or Target ROAS. Starting August 17, according to Google’s own support documentation, campaigns that have historically beaten their targets while budget-constrained will instead be pushed to perform closer to the number the advertiser actually typed in. Google’s own example is blunt: a campaign with a $10 target CPA that has been quietly delivering at $5 will move toward $10, unless the advertiser changes the target first.
That reverses years of the accepted logic around budget caps. Advertisers who set a conservative target as a safety ceiling, expecting the algorithm to outperform it when budget ran short, now have that same conservatism used against them: the target becomes a floor the system tries to reach, not a number it tries to beat. Google has published a Bid Target Adjustment Tool and is telling advertisers directly to review budget-limited campaigns before the change takes hold, which is itself a signal of how many accounts are about to see cost-per-acquisition or ROAS shift with no creative, audience or budget change behind it.
The original insight here is not the mechanic, it is the incentive it exposes. Every account that has been quietly overperforming its stated target has, in effect, been under-declaring its real willingness to pay, and Google’s own systems are now correcting for that gap automatically rather than leaving the advertiser’s conservative number as free upside. Revenue and growth teams that treat targets as a rough guardrail rather than a live commercial commitment are the ones most exposed, and the fix is not a bigger budget, it is auditing every Target CPA and Target ROAS figure in the account against what the business can actually afford before August 17 makes the old cushion disappear. Ad measurement bias has already become a live audit item this year; target accuracy is the next line on that same checklist, and it sits next to the platform-side shift toward ad platforms behaving as analysts rather than dashboards.
Source: Google Ads Help
