If your budget-limited campaigns have been quietly beating their targets, that streak ends soon. Google is steering Smart Bidding back to the numbers you actually typed in — and the fix isn't automatic.
For years, a budget-limited campaign running Target CPA or Target ROAS could quietly outperform the number you set. A $50 Target CPA might deliver conversions at $35. Most advertisers treated that as a win and never touched it. Starting August 17, 2026, Google is closing that gap — and campaigns that have been overperforming will drift toward the target you originally entered, not the better number Smart Bidding has been delivering.
This isn't a labeling tweak. It's a change to how the bidding system behaves under budget constraints, and it can raise your real cost per conversion or reduce your ROAS overnight if you don't review your account first.
What's actually changing
Today, when a campaign using a target-based bid strategy is marked "Limited by budget," Google's bidding system has some flexibility to overperform its stated target. That flexibility is what lets a Target CPA of $50 quietly land at $35, or a Target ROAS of 400% land at 550%.
After August 17, that flexibility is removed for budget-limited campaigns. The system will optimize more consistently toward the exact target you've set — including when you raise or lower budgets. Google frames this as more predictable scaling: what you type is what you get, even after a budget change. The tradeoff is that any campaign currently benefiting from the old flexibility will see its performance shift back toward its target.
Note what doesn't change: Google will not automatically adjust your bidding targets or your budgets. If your current target of $50 no longer reflects what you're willing to pay, that's on you to fix before the 17th.
Why now — and why brand campaigns are the biggest risk
Google's stated goal is predictability: budgets and targets should behave like two independent levers, not two settings that quietly interact. Under the old system, a budget change to a constrained campaign could cause unpredictable performance swings, because the system was managing both spend and an invisible efficiency cushion at the same time.
The accounts most exposed are the ones that have gotten comfortable with that cushion — brand campaigns in particular. Branded search terms convert at high rates and low costs almost by default, so a budget-limited brand campaign will often overachieve its target for months without anyone noticing. Those are exactly the campaigns that will feel the biggest jump in CPA, or the biggest drop in ROAS, when enforcement begins.
Who's most exposed
Any campaign that has been "Limited by budget" at any point in the trailing 12 months, and is running Target CPA or Target ROAS. Google's lookback window is broad — a campaign that was budget-constrained for two weeks last fall and has run comfortably since can still be flagged.
Which campaigns are in scope
Search Shopping Performance Max Demand Gen Display Hotel Travel
This applies to Target CPA and Target ROAS across the campaign types above, and specifically to Target CPC for Demand Gen. Demand Gen campaigns managed in Display & Video 360 are included too.
Not affected: Manual CPC and Target Impression Share bid strategies are untouched. Campaigns using campaign-total budgets (rather than daily budgets) also won't see a change in behavior.
Portfolio bidding and shared budgets
If you're running portfolio bid strategies or shared budgets, any target adjustments need to happen at the portfolio or shared-budget level, not the individual campaign level. In shared budgets that are constrained, the impact is spread across every campaign in the group.
What to do before August 17
1 Pull a target vs. actual report for every budget-limited campaign
Look at the last 90 days of actual CPA or ROAS against your stated target for every Target CPA and Target ROAS campaign — pay special attention to brand campaigns.
2 Use the Bid Target Adjustment Tool once it's live
From July 6, Google surfaces flagged campaigns directly in the campaign settings page with a one-click option to reset the target to recent actual performance.
3 Decide, per campaign, what you actually want
Match recent performance to hold your current CPA/ROAS steady, set a fresh target based on current margins if your business goals have shifted, or remove the target entirely if you'd rather optimize for volume than a fixed number.
4 Don't relearn everything on the deadline
If you're planning to loosen targets and scale spend, do it incrementally over a few weeks rather than all at once, and watch performance between each budget increase.
5 Re-check portfolio and shared-budget campaigns separately
These need target changes applied at the portfolio or shared-budget level — adjusting one campaign inside the group won't be enough.
Quick answers
Will Google change my targets or budgets for me?
No. Google has confirmed it won't automatically adjust bidding targets or daily budgets. Every action here is manual.
Will this hurt traffic quality?
Google's position is that the system will keep pursuing as many conversions as possible at whatever target you set — the change affects how strictly that target is enforced under budget constraints, not the underlying quality signals used to bid.
Does this affect campaigns that aren't budget-limited?
No. This update specifically targets campaigns in a "Limited by budget" status. Unconstrained campaigns, and campaigns using Manual CPC or Target Impression Share, aren't affected.
Can I still change targets after August 17?
Yes, at any time, before or after the change. Smart Bidding reacts to target adjustments in real time.
