Last checked against Google’s documentation on 29 September 2026.
The Google Ads Target CPA change of August 2026
The Google Ads Target CPA change in August 2026 affects campaigns that use Target CPA or Target ROAS and are “Limited by budget”. According to Google’s help page Changes to target based bid strategies, on 17 August 2026 Google updated its bidding systems so these campaigns perform more consistently toward the target you set. Google’s FAQ on the change says the rollout started on August 17, 2026 and was completed globally on August 27, 2026.
In practice: if a budget-limited campaign was beating its target (a lower cost per conversion than the Target CPA, or a higher return than the Target ROAS), it now tends to deliver closer to the target itself. Google did not change your targets or budgets. If your actual numbers are what you want to keep, lower the Target CPA or raise the Target ROAS to match them, or give the campaign more budget.
Before and after: hitting the target instead of beating it
Before the change, a campaign that ran out of budget could end up more efficient than its target. Google describes these as campaigns that were overperforming on their bidding targets, and says they could see performance swings when budgets were adjusted.
Google’s own example, in round numbers: a campaign with a Target CPA of 10 that recently achieved a CPA of 5 now delivers more closely to an actual CPA of 10. The target used to act like a ceiling the campaign often stayed well under; now it behaves like the number the campaign aims for.
Google’s stated upside is that raising the budget becomes more predictable: you can add budget to get more conversions or conversion value without efficiency moving unexpectedly.
Which campaigns are affected
| Affected | Not affected |
|---|---|
| Search, Shopping, Performance Max, Demand Gen, Display, Hotel, and Travel campaigns that use a target-based bid strategy and are limited by budget | App campaigns, Video reach campaigns, Video view campaigns; any Target CPA or Target ROAS campaign that is not budget-constrained |
Portfolio bid strategies and shared budgets are included. Google’s FAQ says target changes for those must be made at the portfolio bid strategy or shared budget level, not in the individual campaign. For multi-channel campaigns like Performance Max and Demand Gen, Google also notes you may see shifts in how traffic is distributed across channels.
The same change for Target ROAS
The Target ROAS change in August 2026 is the same change seen from the other side. A budget-limited Target ROAS campaign that was returning more than its target now tends to deliver closer to that target. If your target is lower than the return you actually want, conversion value per unit of spend can fall toward it. The fix is also the mirror image: raise the Target ROAS to the level you want to keep.
Is your Target CPA overspending after the update?
Strictly, a budget-limited campaign can’t spend more than before; Google says daily and monthly budget limits are still respected. What people describe as “overspending” is usually a higher cost per conversion for the same spend. Check these three things for each campaign:
- Was it limited by budget? Look at the Status column in the campaigns table. Only campaigns shown as “Limited by budget” are in scope.
- Did it beat the target before August 17? Compare the actual CPA or ROAS for a period before August 17 with the target. A wide gap in the campaign’s favour is exactly the case Google describes.
- Did the gap close after August 27? Compare the same metric for a period after the rollout finished. If actual CPA rose toward the target, or actual ROAS fell toward it, this change is the likely cause, not something else in the account.
If the campaign was not limited by budget, or its actual numbers were already close to the target, look for another cause. Our guide on lost impression share from budget versus rank helps you confirm whether budget was really the constraint.
What to do: four choices
Google’s advice is to make sure your settings match your business goals, especially for campaigns performing better than their targets. For each affected campaign, pick one:
- Keep the target, accept the change. If the target is the true cost per conversion you can afford, the campaign now uses the room you gave it. That can bring more conversions within the same budget.
- Move the target to your real goal. If you want to keep the efficiency you had, lower the Target CPA or raise the Target ROAS to where performance actually was.
- Add budget, keep the target. Google’s suggestion for keeping efficiency is to give the campaign a budget buffer while setting a target that reflects the efficiency you want.
- Change the bid strategy. If the budget can’t move, Google suggests Maximize conversions or Maximize conversion value to get the most from a fixed budget.
Change one thing per campaign, write down the date, and don’t stack a target change on top of a budget change in the same week. Otherwise you won’t know which one moved the numbers.
Using the bid target adjustment tool
Google added a tool to review affected campaigns and adjust targets. Its help page lists two ways to reach it:
- From the account notification banner, select Review campaigns.
- Go to Campaigns, open the Campaigns drop-down, then the campaign settings, then Bidding, and select Review campaigns.
If a campaign is beating its target and you want to keep that performance, you can apply the tool’s suggested target based on recent performance. Google’s FAQ says it doesn’t calculate a recommended target for campaigns with fewer than 7 conversions, because their performance is too unpredictable. For those, set the target by hand from your own numbers. Search Ads 360 users reach the same review through account notifications, under Review bid strategies.
Before you apply a suggested target, check it against what a conversion is worth to your business. A target copied from a short, unusually good period can starve the campaign of volume. See why Target CPA stops spending if a new, tighter target makes spend drop.
How to compare before and after
Use equal-length periods and keep the rollout window out of both. A simple setup is the 28 days before August 17 against the 28 days after August 27, adjusted for any other change you made. Compare, per campaign:
- Actual CPA or actual ROAS, next to the target in force during each period.
- Conversions and conversion value, not only efficiency. A higher CPA with more conversions may be a good trade.
- Spend and the “Limited by budget” status in each period.
- For Performance Max and Demand Gen, the channel split, since Google says it can shift.
Google recommends waiting one to two conversion cycles after any target change before judging it in the bid strategy report. Its general guidance on Target CPA bidding is also worth rereading if you are setting targets from scratch.
Boxoo’s campaigns and budgets agent reviews every Target CPA and Target ROAS campaign each day, checks which ones are limited by budget, and compares actual performance with the target before and after a change. When a target or budget no longer fits, it files a case with the numbers and prepares the change where the Google Ads API allows it, or gives you the exact steps where it doesn’t. Nothing changes until you press Apply, and most applied changes keep an undo.
Run a free Google Ads audit to see which of your campaigns this change affected. For the other changes this year, read Google Ads updates in 2026.
