Google's August 17 bidding change hits campaigns that beat their targets
From August 17 budget-limited Target CPA and Target ROAS campaigns will bid closer to their targets. Which campaigns are exposed, and how to reset targets before delivery shifts.
If you have a Target CPA or Target ROAS campaign that shows "Limited by budget" and has been delivering at a cost well below target, Google is about to change that. Beginning August 17, Google says these campaigns will "more consistently perform toward" the target you set. Google's own framing is predictability. The practical reading is that a campaign that has been quietly beating its target may start spending toward it, which can mean higher CPAs or lower ROAS than you are used to seeing. Nothing changes automatically in your settings, so there are about twelve days to decide what you want.
What Google has said
Per Search Engine Roundtable's report on Google's help documentation, the update applies to Search, Shopping, Performance Max and Demand Gen campaigns that use target-based bid strategies and are marked as limited by budget. Another trade report adds Travel and Display to the list and says App campaigns and Video campaigns are excluded; because coverage differs on scope, check the help page for your campaign types rather than relying on either summary.
Key dates, according to those reports: Google announced the change in June, updated its documentation and sent notices on July 2, and made a Bid Target Adjustment Tool available on July 6. The behavior change starts August 17 and rolls out over several weeks. Google's Ads Liaison said the update does not change spend on campaigns already constrained by budget. The change is about the price you pay for what you buy, not the amount you spend.
One more thing to know: Google has relabeled the strategies. "Maximize conversions with a Target CPA" is now simply "Target CPA," and "Maximize conversion value with a Target ROAS" is "Target ROAS." That is a naming change, but it arrived at the same time as the behavior change, and it is easy to conflate the two.
Why a campaign beating its target is not always good news
A campaign that delivers a $5 CPA against a $10 target looks efficient. It is also telling you that the budget is binding and the system is under-bidding: it is leaving available volume on the table to stay far inside the target. Many teams read that as a strong campaign and add more budget elsewhere. Under the new behavior, Google will pull such a campaign closer to the stated target, so volume and cost per result both rise.
Whether that is good depends on your economics. If a $10 CPA is genuinely profitable, then more volume at $8 or $10 is a win and the budget was set too low. If the $10 target was a loose number someone typed two years ago, you are about to pay for conversions you did not want at that price.
A review you can do in an afternoon
- Filter for exposure. List campaigns with a Target CPA or Target ROAS strategy that have shown "Limited by budget" in the past year. Google's tool notifies accounts that fit this description, but a filter in the account is quicker than waiting for a notice.
- Compare actual with target. For each campaign, set the last 60 days of actual CPA or ROAS beside the target. The wider the gap, the more the campaign can move.
- Decide per campaign what the right number is. Work from your payback or margin, not from history. If the target reflects what you can afford, leave it. If it is looser than what you can afford, tighten it now. If you want to keep today's performance, set the target to what you recently achieved.
- Use the tool deliberately. It lets you keep the current target, lower it to match recent results, set a new one, or switch to a maximize strategy, which removes the target. Switching to maximize hands even more control to the system, so we would not choose it only to avoid the decision.
- Write down the baseline. Record CPA, ROAS, CPC and spend per campaign for the last four weeks so you can tell afterward what actually moved.
What to watch after August 17
The rollout is gradual, so effects will arrive unevenly. Watch average CPC, conversion volume and CPA by day for each exposed campaign, and judge over two weeks rather than two days. An industry commentator quoted in the trade press expects higher CPCs; that is an opinion, not a measurement, and your own baseline is the thing to check. Do not change budgets and targets on the same day, or you will not be able to separate the causes.
Suppose a campaign has a $10 target CPA and has averaged $5 for a year while limited by budget. If delivery moves it to $8, you have more conversions at a higher price. Whether that helps depends on whether those extra conversions are worth $8 to you. This is a hypothetical example with round numbers, but the question is the real one: for each campaign, what is the most you would pay per result, and does your target say so?
Where this leaves budget decisions
If you have been using budget as the throttle and ignoring the target, the target now matters more. Treat it as a spending ceiling per result and set it on purpose. If you have been keeping targets loose as a safety net, they are now an instruction.
The takeaway: before August 17, list your budget-limited campaigns, compare targets with actual results, and set each target to the most you would really pay per result.