Google Just Changed How Target CPA and Target ROAS Work: What Australian Advertisers Need to Do Now

If you manage a Google Ads account and have not looked at your bid targets in a while, now is the time. From 17 August 2026, Google rolled out a change to how it treats campaigns using Target CPA and Target ROAS bidding once they are sitting in a “Limited by budget” status, and it could quietly reshape how your ad spend performs over the coming weeks.

Here is what actually changed, why it matters for your account, and the short checklist to run this week.

What actually changed with Target CPA and Target ROAS?

Up until now, plenty of budget-constrained campaigns have been overperforming their stated targets without anyone noticing. Say your Target CPA was set to $10, but your account was actually delivering conversions at $5. Google’s system was happy to let that gap sit there indefinitely, because the campaign was still spending its full daily budget and the advertiser was, on paper, getting a bargain.

That is no longer how the system behaves. Google now pulls performance closer to whatever target you have actually entered, whether the campaign is limited by budget or not. Using the same example, a campaign with a $10 Target CPA that has been quietly running at $5 will start drifting back up toward $10. Your daily and monthly budget caps stay exactly where you set them. What changes is how the algorithm spends that budget once it gets there.

The update covers Search, Shopping, Performance Max, Demand Gen and Travel campaigns run through Google Ads or Search Ads 360, plus Demand Gen campaigns managed in Display & Video 360. Manual CPC, Target Impression Share and Target CPM are not affected.

Why does this matter for your account?

For a lot of advertisers, this is genuinely good news. It closes an inconsistency where the same target could deliver wildly different efficiency depending on how tightly the campaign was constrained by budget, which made forecasting and reporting harder than it needed to be. Once this settles in, the target you set becomes a much more reliable predictor of what you will actually get.

For advertisers who have not reviewed their targets in months and have been coasting on quiet overperformance, this is the part that stings. If your reported cost per lead has actually been sitting well under your stated target, you may see cost per lead rise as the account catches up to what you told it to aim for. That is not a bug. It is the account finally doing what you asked it to.

What should you do this week?

Google will not adjust your targets or budgets automatically, so the responsibility sits with you or your agency. A few things are worth doing right now:

1. Find your exposed campaigns. Pull a report on every campaign currently marked “Limited by budget” using Target CPA or Target ROAS, and compare the stated target against actual recent performance.
2. Close the gaps deliberately. Where there is a large gap, decide whether to tighten the target to protect margin, or leave it as is and accept a shift in reported cost per lead. Make it a decision, not a surprise.
3. Let the system settle. Give the account at least one full conversion cycle before making further changes, and be cautious reading forecasting tools in Google Ads through the rest of August while the system recalibrates.
4. Tidy your tracking. If conversion tracking has been loose, this is a good prompt to fix it. Google has effectively said it will reward advertisers who set accurate targets and track conversions properly, and quietly penalise accounts running on autopilot.

If your ad budget is under pressure from rising click costs, it is also worth making sure the traffic you are paying for is landing on pages built to convert, and that you are recapturing the visitors who leave. Our guide to Google remarketing covers the low-cost side of that.

The bigger picture

This change is part of a wider theme in 2026: the platforms are getting better at doing exactly what you tell them, which means sloppy targets and loose tracking cost more than they used to. The advertisers who win from here are the ones treating Smart Bidding targets as real business inputs, not set-and-forget numbers. It pairs closely with the shift we cover in zero-click search, where the value increasingly sits with the high-intent searches that still convert.

Not sure where your account stands?

Running an audit across every campaign, target and conversion action takes time most business owners do not have spare. If you would rather have a specialist walk through your account and tell you exactly where you stand before your numbers move, our Google Ads audit covers precisely this. We also run ongoing Google Ads management for businesses across Australia, including the Performance Max campaigns directly affected by this change.

If you would like a second set of eyes on your account, book a free strategy session and we will talk you through what we are seeing.