Google Ads Bidding Changes in August 2026: What Happens to Target CPA and Target ROAS

Google announced one of its most consequential bidding changes in years. Starting August 17, 2026, campaigns with a "Limited by budget" status that use Target CPA or Target ROAS will stop delivering below the target you set and will be steered back toward it. If you have campaigns converting at half their stated Target CPA, that era is ending.

It sounds technical, but the impact is very practical: a higher cost per conversion overnight if you do not update your targets in time. You have a clear action window, and below is exactly what to do with it.

What Is Google Changing on August 17, 2026?

Until now, a budget-limited campaign on a target-based bid strategy behaved in a way that quietly favored advertisers: Smart Bidding entered only the auctions most likely to convert efficiently, so many campaigns delivered well below Target CPA or well above Target ROAS.

Google's own example says it all: if your Target CPA is $10 but your recent actual CPA is $5, starting August 17 the campaign will deliver much closer to $10 if you change nothing.

Google says this overperformance was never the intended behavior. After the update, Smart Bidding will optimize consistently toward the target you actually set, including when you adjust budgets. You gain predictability and more stable scaling, but you lose the invisible "discount" many accounts have been enjoying.

Which Campaigns Are Affected?

The change applies to Search, Shopping, Performance Max, Demand Gen, and Travel campaigns managed in Google Ads or Search Ads 360, plus Demand Gen campaigns managed in Display & Video 360.

You are in the risk zone if:

• the campaign uses Target CPA or Target ROAS
• the campaign carried a "Limited by budget" status at any point in the last 12 months
• actual performance is noticeably better than the set target

Pay attention to that 12-month window: a campaign that was budget-limited for just two weeks half a year ago is still in scope. Google has sent email and in-account notifications to affected advertisers, so check your inbox and the notifications panel in Google Ads.

What Is the Bid Target Adjustment Tool and How Do You Use It?

Since July 6, 2026, Google has been rolling out a new instrument inside accounts: the Bid Target Adjustment Tool. You will find it in the settings of affected campaigns, and it shows the gap between your set target and recent actual performance.

You have three options:

1. Apply Google's suggestion - the target aligns automatically with recent actual performance
2. Set a custom target - if your business goals have changed since you last touched it
3. Do nothing - the campaign will start delivering toward the target currently in your settings

Important: Google will not automatically adjust your daily budgets or your bid targets. The decision stays entirely with you; the tool only exists so you make it deliberately.

What Happens If You Do Nothing Before August 17?

It depends on each campaign's situation.

If your target accurately reflects what you want from the campaign, you genuinely have nothing to do. After August 17, the campaign will deliver more predictably toward that target and scale more smoothly when you raise budgets.

But if a campaign has spent months delivering far below its Target CPA while the target sat untouched, brace for volatility. Actual CPA will climb toward the number in your settings. For some accounts, that can mean nearly doubling the cost per conversion without you changing a single thing. Not because Google is raising prices, but because it will now hold you to the number you typed in.

How to Prepare: The Exact Process We Run on Client Accounts

1. Filter every campaign that carried a "Limited by budget" status in the last 12 months
2. Compare the set target against real CPA or ROAS over the last 30-90 days
3. Where the gap is large, decide deliberately: keep current performance (lower the target toward reality) or accept delivery at the set target (gain predictability and potential volume)
4. Document every target you change, so you can measure the update's impact accurately after August 17
5. Watch the first 2-3 weeks after rollout closely: the change deploys gradually over several weeks

One detail most advertisers miss: the update affects all conversion types in scoped campaigns, including view-through conversions and offline conversion imports. If you import conversions from a CRM, include them in the analysis.

Bottom Line

The August 17 update is not a disguised price increase; it is an alignment. The system will deliver at the number you wrote down. The real problem is that many accounts run on targets set a year or more ago that no longer describe reality. The July 6 to August 17 window exists precisely for that hygiene: review, decide, then let the system work.