If your budget-limited Target CPA or Target ROAS campaigns have been quietly landing cheaper conversions than the number you set, enjoy it while it lasts. Google is closing that gap, and it isn't going to ask permission first.
We flagged this to clients in last month's Pack Behaviour newsletter. Here's the fuller version, with the detail a newsletter can't fit, and the exact steps to get ahead of it.
What's Actually Changing
Right now, if a campaign is marked "Limited by budget" and running Target CPA, Target ROAS, or Target CPC (for Demand Gen), Smart Bidding can - and often does - find conversions well below the target you've set. Google's own example describes a campaign with a $10 Target CPA that's actually been landing conversions at $5. Because the budget runs out before the target does, the system rations what's left toward the strongest opportunities, and quietly overdelivers.
From August 2026, that changes. Campaigns that aren't budget-constrained won't notice any difference - they'll keep scaling in line with the stated target, same as always. But for budget-limited campaigns, Google will optimise bidding to land closer to the actual number you've entered, rather than continuing to beat it. The rollout is gradual and global, starting that date and continuing over several weeks, so some accounts won't see the shift immediately.
Google first flagged the change back in June, then followed up with clarifications after pushback from the PPC community questioning why it would deliberately reduce efficiency in campaigns that were already outperforming.
Who This Actually Affects
Not every campaign. Google's eligibility is specific:
- Affected: Target CPA and Target ROAS campaigns (plus Target CPC for Demand Gen) currently showing a "Limited by budget" status.
- Not affected: Manual CPC and Target Impression Share strategies, and any Target CPA/ROAS campaign with an unconstrained budget.
- Not affected: The auction mechanics themselves. This is a bidding behaviour change inside Smart Bidding, not an update to how Google Ads auctions work.
If you're not sure which of your campaigns carry that "Limited by budget" flag, it's visible directly in the campaign view.
Why Google Is Making the Change
Google's stated reasoning is predictability. When a budget-limited campaign has quietly been overperforming its target, increasing the budget can produce unpredictable swings — the algorithm suddenly has access to a much wider pool of auctions, and performance shifts in ways that are hard to plan around. Tying bidding more literally to the target you've actually set is Google's fix for that unpredictability.
Put simply: the target stops being a loose suggestion and starts behaving like a literal instruction. That's good for predictability. It's not free, though - the efficiency you've been getting was real, and it's about to disappear unless you plan for it.
What to Do Now
You can run this audit yourself in about ten minutes with the checklist below. Or, as a certified Google Ads Partner, it's the kind of account hygiene we handle day-to-day for clients, happy to take it off your plate.
- Audit for "Limited by budget" status. Filter your account for Target CPA/ROAS campaigns carrying that flag.
- Compare target vs actual performance. If your Target CPA is set at $50 but you're consistently landing conversions at $35, that gap is what's about to close.
- Decide: lower the target, or hold and accept higher costs. Google won't do this for you - the choice sits entirely with the advertiser. Bringing the target down to match recent actual performance preserves your current efficiency. Leaving it unchanged means accepting spend that drifts toward the number in the box, in exchange for potentially more volume.
- Use Google's Bid Target Adjustment Tool. It's been rolling out to accounts gradually since 6 July 2026, and it's the fastest way to see a suggested target based on recent performance.
- Move in small steps, not one big swing. Nudge targets gradually and watch how the account responds before adjusting again, rather than making one large correction.
- Expect a bumpy few weeks. Every advertiser in the auction is recalibrating around the same time. Don't read too much into week-one data.
Quick FAQs
Does this affect all my Google Ads campaigns?
No. Only Target CPA and Target ROAS campaigns (and Target CPC for Demand Gen) are currently showing "Limited by budget." Campaigns with headroom in their budget continue exactly as before.
Will Google adjust my targets automatically?
No. Google has been explicit that it won't touch your targets or budgets — auditing and adjusting is entirely on the advertiser.
Does this change how the Google Ads auction works?
No. This is a bidding behaviour change inside Smart Bidding, not a change to auction mechanics.
What happens if I do nothing?
If your budget-limited campaigns have been beating their targets, expect actual cost per acquisition (or ROAS) to drift toward the number you've set, starting 17 August and rolling out over the following weeks.
The Takeaway
This isn't a reason to panic. We see it as a great opportunity to audit your account and make changes. The advertisers who come out ahead here are the ones treating this as a prompt to revisit targets they haven't touched in months, not the ones waiting to see what happens.
This kind of Smart Bidding audit sits within our broader digital marketing work. If you want a second pair of eyes on your account before the rollout reaches you, get in touch with our team - we've been auditing client accounts ahead of this change and can tell you whether your targets need moving.
