Published 27 August 2026. Verified against Google Ads Help on 26 August.
If you run Google Ads and your cost per acquisition has been quietly better than the target you set, that ends this month.
On August 17, 2026 Google changed how target-based bid strategies behave on budget-limited campaigns. It is not an outage, a bug, or a tracking problem. It is a deliberate change, it was announced in advance, and most advertisers will meet it for the first time in a monthly report.
Here is the version worth understanding before someone asks you about a chart.
What actually changed
Before August 17, a campaign carrying a "Limited by budget" status and running Target CPA or Target ROAS could drift away from its stated target — often in your favour. Budget constraints made the system behave conservatively, and plenty of campaigns quietly outperformed the number in the settings.
After August 17, in Google's words, those campaigns
"will more consistently perform toward your bid target, including when you make budget adjustments."
Google's own worked example is the clearest statement of the consequence:
"If your campaign's Target CPA is $10, but your recent actual CPA performance is $5, your campaign will deliver more closely to a $10 actual CPA starting August 17, 2026."
Read that twice if you manage budget-limited accounts. A campaign delivering $5 against a $10 target moves toward $10. Nothing failed. The system simply stopped handing you efficiency you never asked for in the settings.
The same logic runs the other way for Target ROAS. If you have been beating your ROAS target, expect to land nearer it.
Who this hits
Affected: Search, Shopping, Performance Max, Demand Gen and Travel — across Google Ads, Search Ads 360, Display & Video 360, Google Ads Editor and the API.
Not affected: App campaigns, Video reach campaigns and Video view campaigns keep the previous behaviour. Display and Hotel campaigns were already running the new behaviour.
The qualifying condition is the part people miss. This applies to campaigns that are limited by budget. Campaigns that are not budget-constrained will not behave differently. If your accounts run with genuine budget headroom, you may see nothing at all.
For Performance Max and Demand Gen there is a second-order effect worth watching: Google notes you may also see shifts in how traffic is distributed across channels inside those campaigns.
The trap in the reporting
The awkward part is not the change. It is the timing.
A campaign that has been running at a $5 CPA against a $10 target has been producing a number that looks like skill. It appears in reports. It gets attributed to optimization work. Nobody flags it, because nobody escalates good news.
When that number moves to $10, it is going to look like something broke — in the middle of a month, against a comparison period that contained the old behaviour. Half a month of each, blended into one average, is the worst possible way to see this for the first time.
If you manage accounts for clients, the conversation is much easier before the report than after it.
Where this actually hurts
For most advertisers this is a reporting inconvenience. For some it decides whether the channel works at all.
The difference is what a single conversion is worth. If you are paying $40 for a lead worth $300, a move from $5 to $10 CPA is noise you can absorb while you re-plan. If you are in a category where a case, a contract or a patient is worth five figures, cost per acquisition is not a metric on a dashboard — it is the constraint the entire account was built around, and every target in it was set by someone doing arithmetic against a close rate.
Legal is the sharpest version of this. Clicks are among the most expensive Google sells, budgets are almost always constrained, and the gap between a $5 and a $10 acquisition cost is the difference between a channel that funds itself and one that gets cut in the next quarterly review. The same is true of home services at the high end, elective medical, and B2B with a long cycle and a large contract.
If that describes your account, the review below is not housekeeping. Our guide to law firm PPC management and account structure covers how we build campaigns where the target has to hold, and every part of it assumes exactly the constraint this change tightens.
What to do
Google is explicit that it will not adjust your targets or budgets for you. The decision is yours, and there are four defensible versions of it.
For most accounts the answer is option 2 — put your actual performance into the settings. If a campaign has been running at $5 against a $10 target, the $5 is the number your business has been operating on, whatever the settings said. Make the settings tell the truth, then decide separately whether to scale. The other three options are real, and each is right for a specific situation.
1. Do nothing, deliberately. If the target in your settings is genuinely the number your business needs, let performance move to it. You then get something you did not have before: predictable scaling. Raising budget on a campaign that is optimizing consistently to target no longer produces the efficiency wobble it used to.
2. Re-target to your actual performance. If the $5 was the number you actually want, put $5 in the settings. Google shipped a Bid Target Adjustment Tool on July 6 that reads recent performance and applies it. In Google Ads it appears in the "Review your campaign targets" notification banner, or under Campaigns → Settings icon → Bidding → Review campaigns. If your campaigns are managed through Search Ads 360, the tool does not appear in Google Ads — you access it from the SA360 notifications banner instead.
3. Pick a different number entirely. Between an aspirational $10 and an actual $5 there is often a real answer neither one represents. This change is a reason to work out what a conversion is actually worth rather than inheriting a target somebody set during onboarding.
4. Change strategy. Maximize Conversions or Maximize Conversion Value will protect volume — at the cost of the target. Those strategies spend the full budget without one, so CPA and ROAS will fluctuate as budgets move. That is a real trade, not a free escape.
One structural note worth acting on regardless: Google's guidance is to keep daily budget comfortably above average daily spend. The entire change is scoped to budget-limited campaigns. A campaign that is not budget-limited never enters this conversation.
The number nobody escalates
This is the class of change that damages trust silently.
Nobody loses an account over a bidding update. Accounts are lost when a number moves, the client notices before the agency does, and the explanation arrives second. A campaign quietly beating its target for six months produces a figure that looks like skill, sits in every report, and gets attributed to good work — because nobody escalates good news. When it corrects, it corrects into somebody else's meeting.
The work here is not clever. It is opening the account, filtering to campaigns that are limited by budget and running a target strategy, and deciding on purpose which of the four options applies to each one. Explaining a platform change before a client asks about it is most of what a competent agency relationship is, and it is almost entirely a matter of having looked.
The ten-minute version: filter your campaigns to "Limited by budget," sort by target strategy, and compare each campaign's actual CPA or ROAS against the number in its settings. Every campaign where those two disagree is exposed. That list is the whole job, and you can build it before your next stand-up.
If you would rather someone else built that list, ask us for it. Read-only access to the account is enough — we will send back which campaigns are exposed and what we would do with each one. We do this because it is a fast way to find out whether we are useful to each other, and because the accounts where this matters most tend to be the accounts worth working on.