Google is changing how Target CPA and Target ROAS bidding works on August 17

On August 17, 2026, Google Ads changes how Target CPA and Target ROAS bidding behaves for any Search, Shopping, Performance Max or Demand Gen campaign flagged "Limited by budget." If that phrase means nothing to you yet, it is about to. Google announced the change through Ads Liaison Ginny Marvin in June, shipped a review tool on July 6, and the update lands in two weeks. Some accounts will not feel it at all. Others will watch their cost per acquisition drift toward a number typed into a settings field months ago and forgotten since.

What exactly changes on August 17?

According to Google's own help documentation on changes to target-based bid strategies, the update applies specifically to campaigns that are both limited by budget and running a target-based bid strategy, meaning Target CPA or Target ROAS. Before August 17, a budget-limited campaign on these strategies could deliver performance well ahead of its stated target, because Smart Bidding found efficient conversion paths and the budget cap simply capped total spend rather than pushing cost per result up to match the number you entered. After August 17, the same campaigns will move to perform more consistently toward that target, including when you raise or lower budget.

Put plainly: the target field stops being a soft ceiling and starts being closer to the actual number the algorithm aims for. That is the entire mechanic. It is a small technical adjustment with a large practical consequence for anyone whose account has been quietly overperforming.

Why campaigns that beat their targets are the ones getting hit

Here is the pattern reported across multiple outlets covering the rollout, including Search Engine Land and PPC Land: a campaign with a Target CPA of $10 that has actually been converting at $5 will not keep converting at $5 once the update lands. Google's system reads that gap as unrealized headroom and starts spending toward the target rather than away from it. The advertiser did not do anything wrong. The campaign was simply performing better than the number on file, and the number on file is what the new system respects.

Those numbers are illustrative of the mechanic Google and industry reporting describe, not a universal outcome. Your actual shift depends on how far your recent performance has drifted from your stated target and how often the campaign has actually hit "Limited by budget" over the past twelve months.

Who is actually affected?

Search, Shopping, Performance Max and Demand Gen campaigns on Target CPA or Target ROAS, and only the ones that have carried a "Limited by budget" status at some point in the last twelve months. If your campaigns regularly spend their full daily budget without ever showing that status, Google's own guidance says bidding behavior should not change materially. If you are running performance marketing across several platforms and Google Ads is one line in a bigger media plan, this is the piece worth auditing this week, not the whole plan.

Google began sending in-account notifications on July 6, 2026 to advertisers with qualifying campaigns, alongside the new Bid Target Adjustment Tool. That tool surfaces every flagged campaign, shows recent actual performance against the stated target, and lets you keep the target, accept a suggested target based on recent results, or enter your own number. Google has been explicit that it will not change anything automatically. The choice, and the consequence of not making one, sits with the advertiser.

Why are advertisers pushing back on this?

Loudly, and publicly. According to PPC Land's coverage, freelance Google Ads consultant Joey Bidner posted on LinkedIn in mid-July that he had "never been more frustrated by a Google Ads update," a post that drew over 70 reactions and dozens of comments from paid search practitioners. His argument, echoed by others in the thread: some of the best-performing accounts intentionally run loose Target CPA or ROAS settings precisely to give Smart Bidding room to explore, test new audiences and find efficiency the tighter number would never have allowed the algorithm to discover. Removing that slack, in his view, does not make performance more predictable so much as it removes a deliberate lever advertisers had been using well.

Google Ads Liaison Ginny Marvin responded directly in the same thread, according to reporting from PPC Land and Search Engine Journal, pushing back on the characterization that the update amounts to advice to let the system spend more freely. Marvin's position is that unconstrained campaigns already behave this way today, the change only touches campaigns that are genuinely budget-limited, and the update makes the target a more reliable proxy for return on ad spend once it lands rather than a looser suggestion. Neither side is wrong exactly. They are describing the same mechanic from opposite sides of the budget cap.

Does this mean Google wants you to spend more?

Not directly, and Google has said as much on the record. The update does not raise your daily budget or spend beyond the cap you set. What it changes is how much of that budget converts efficiently once the cap is reached. A campaign that used to squeeze extra converting volume out of a capped budget at a low CPA will, after August 17, spend the same capped budget delivering fewer, more expensive conversions that land closer to your stated target. Total spend does not necessarily rise. Effective cost per result on flagged campaigns very well might, and that shows up on your invoice the same way a spend increase would.

This is also a reasonable moment to separate platform-reported ROAS from what your business actually banked, a distinction that matters even more once the platform's own target number starts driving delivery more literally.

Three ways to respond before the deadline

1. Tighten the target to match reality. If your $10 target has been converting at $5 for months, that $5 is closer to your real number. Set the target near there and you keep the efficiency the loose setting was quietly delivering.
2. Raise the budget so the campaign stops being budget-limited. If the campaign has room to scale and the unit economics support it, removing the budget cap sidesteps the new mechanic entirely, since it only governs budget-limited campaigns.
3. Accept the new target and replan around it. If neither option fits, at minimum recompute your blended CAC and margin assumptions for the affected campaigns before August 17, so the shift shows up as a planned adjustment rather than an unexplained line in next month's report.

What this means if you manage multiple platforms

This is a good prompt to check whether bid strategies across every platform still reflect actual unit economics rather than settings typed in a year ago and never revisited. If you run paid social alongside Search, do this alongside a conversion rate review, since a CPA shift on the paid media side changes what the landing page needs to convert at to hold blended CAC steady.

Frequently asked questions

What is changing in Google Ads on August 17, 2026?

Google is changing how Target CPA and Target ROAS bidding behaves for Search, Shopping, Performance Max and Demand Gen campaigns that are marked Limited by budget. Instead of quietly outperforming your stated target, these campaigns will move to deliver results closer to the actual number you typed in, even when you adjust budget.

Will my cost per acquisition go up because of this update?

Only if your budget-limited campaigns have been beating their Target CPA or ROAS, which many have. If your account has quietly delivered a $5 CPA under a $10 target, expect that gap to close after August 17 unless you tighten the target yourself using the Bid Target Adjustment Tool.

Which campaign types does the August 17 bidding change affect?

Search, Shopping, Performance Max and Demand Gen campaigns running Target CPA or Target ROAS bid strategies. It only applies when a campaign has been flagged Limited by budget at some point in the last twelve months. Campaigns that already spend their full budget without hitting that status are not directly affected.

What is the Bid Target Adjustment Tool?

It is a tool inside Google Ads, live since July 6, 2026, that shows which of your campaigns are Limited by budget and using target-based bidding, along with their recent actual performance. From there you can keep the existing target, apply a suggested target based on recent results, or set a custom one. Google will not change your targets for you.

Why are advertisers upset about this change?

Many advertisers deliberately set loose Target CPA or ROAS figures to give Smart Bidding room to explore and find efficient conversions below the stated number. The August 17 change removes that slack for budget-limited campaigns, which some practitioners argue quietly benefits Google's revenue more than it benefits advertiser efficiency.

What should I do before August 17?

Open the Bid Target Adjustment Tool, find every campaign flagged Limited by budget on a Target CPA or ROAS strategy, and decide deliberately: tighten the target to match true economics, raise the budget so the campaign is no longer budget-limited, or accept the target as your new real number. Doing nothing is itself a choice with a cost.

The takeaway

This is a small settings change with a real invoice attached. Google is not raising your budget caps and it is not asking you to spend more outright, but it is removing the quiet slack that many budget-limited Target CPA and ROAS campaigns have been running on, and that slack was real money for accounts that had it. The advertisers who come out fine on August 18 will be the ones who opened the Bid Target Adjustment Tool this week, looked honestly at the gap between their stated targets and their actual performance, and made a deliberate choice instead of finding out from a finance team in September. Two weeks is enough time to do that properly. It is not enough time to do it the week after the deadline passes.