Google Ads Is Changing Budget-Limited Bidding on August 17
If your Target CPA or Target ROAS campaigns are "Limited by budget" and quietly beating their targets, this one's for you. Here's exactly what changes — and what to do before the deadline.
By Brett Casaccio, Founder of Casaccio Media•11 min read•July 2026Researched and written by Brett Casaccio with the assistance of AI.
The 30-second version
- On Aug 17, 2026, budget-limited Target CPA / Target ROAS (and Demand Gen Target CPC) campaigns will bid more consistently toward the target you set.
- Campaigns that overperform today — cheaper CPA or higher ROAS than the target — may see cost rise toward the target and volume drop.
- Google won't touch your targets or budgets automatically. You decide, using the Bid Target Adjustment Tool that went live July 6.
- Your job before Aug 17: find overperforming budget-limited campaigns and either re-target them, switch to Maximize Conversions, or knowingly leave them.
For years, a budget-limited campaign came with a hidden silver lining. If you set a Target CPA that Smart Bidding couldn't quite reach on your budget, the system would often overperform — quietly delivering conversions cheaper than your target because it simply couldn't spend enough to bid up to the goal. Free efficiency.
That's what's changing. Starting August 17, 2026, Google is updating its bidding systems so that budget-limited campaigns using Target CPA, Target ROAS, or Demand Gen Target CPC optimize more consistently toward the target you set — even as you adjust budgets. If your target is realistic, you won't notice much. If you've been riding an accidental overperformance, this is the memo you don't want to miss.
What's actually changing
Per Google's announcement, the update affects one specific situation: campaigns with a "Limited by budget" status that use a target-based Smart Bidding strategy. Today those campaigns can drift below your Target CPA (or above your Target ROAS). After the change, the bidding system treats your target as a firmer anchor and optimizes toward it, rather than banking the extra efficiency that came from being budget-starved.
The practical effect for an overperformer: cost per conversion rises toward your Target CPA, and because the budget is fixed, the same spend now buys fewer, more expensive conversions. It's not a penalty — it's the system doing exactly what your target told it to do. Which is why an outdated target is suddenly a liability.
The timeline that matters
Three dates. One of them is a deadline.
Bid Target Adjustment Tool goes live
Google rolls the tool out inside Google Ads accounts so you can review and adjust targets before the change takes effect.
Your window to review & act
Audit every budget-limited Target CPA / Target ROAS campaign. Decide whether to re-target, switch strategy, or leave it alone.
Bidding change takes effect
Budget-limited campaigns begin optimizing more consistently toward your set target. Overperformers start moving toward the target you have on file.
Before vs. after Aug 17
Toggle to see how a budget-limited, overperforming campaign behaves before and after the change.
Target impact simulator
Set your target, your current (overperforming) CPA, and your monthly budget to see how your conversion volume could shift after August 17. Illustrative model, not a guarantee.
High impact — this campaign needs action before Aug 17.
Illustrative model. It assumes a budget-limited campaign whose effective cost per conversion rises from your current CPA toward your Target CPA after Aug 17, holding budget fixed. Real outcomes depend on auction dynamics, conversion tracking, and how you adjust targets.
Which path should you take?
The Bid Target Adjustment Tool gives you four options. Tap one to see when it's the right call and how to execute it.
When to choose it: Best if you're happy with current volume and CPA and just want to protect them.
- Use the Bid Target Adjustment Tool to reset your target to your recent actual CPA / ROAS.
- This tells the system your current results ARE the goal, so nothing shifts on Aug 17.
- The safest, lowest-effort move for a campaign that's quietly performing well.
- Re-check in 30 days to confirm performance held steady.
What Google's Ads Liaison is saying
Ginny Marvin (@adsliaison), Google's Ads Liaison, has been fielding questions about this change publicly. The points below summarize her guidance — read them straight from the source at the links.
The update makes bid targets clearer, more predictable anchors — it's about performance lining up with the goal you set, not a change to how much budget-limited campaigns spend overall.
Paraphrased summary of public guidance from Google's Ads Liaison. Tap to read the source.
Google is not automatically changing anyone's targets or budgets. Your settings stay put; advertisers stay in control and decide whether to adjust.
Paraphrased summary of public guidance from Google's Ads Liaison. Tap to read the source.
If you switch a campaign to Maximize Conversions, expect your CPA or ROAS to fluctuate as you change budgets — that's the nature of dropping a fixed target.
Paraphrased summary of public guidance from Google's Ads Liaison. Tap to read the source.
Why this matters for your bottom line
Here's the trap: an overperforming budget-limited campaign looks like a winner in your reports — low CPA, strong ROAS. That success can mask a target you set months ago and never revisited. When the anchor tightens on Aug 17, the gap between your stale target and your real performance becomes your loss.
The advertisers who come out ahead won't be the ones who panic or the ones who ignore it — they'll be the ones who audit now, reset targets to reflect reality, and decide on purpose whether they want predictable efficiency or maximum volume. This is a five-minute review per campaign that can protect months of momentum.
Your pre-August 17 checklist
Check items off as you go — your readiness score updates live.
Frequently asked questions
Starting August 17, 2026, Google is updating how campaigns with a 'Limited by budget' status bid when they use Target CPA, Target ROAS, or (for Demand Gen) Target CPC. Today, budget-limited campaigns often overperform their target because they can't spend enough to reach it. After the update, the bidding system will optimize more consistently toward the specific target you set — so an overperforming campaign's cost per conversion tends to rise toward your Target CPA.
No. Google Ads Liaison Ginny Marvin has been clear that this update does not automatically change your existing targets or budgets. Your settings stay exactly as they are — what changes is how the bidding system interprets them. If you take no action, performance simply aligns more tightly with the target you already have set.
Only campaigns that are both limited by budget and currently overperforming their target. If your campaign already hits its target almost exactly, or it isn't budget-constrained, you'll see little to no change. The campaigns most at risk of a volume drop are the ones quietly beating an outdated, overly aggressive target.
It's a tool Google rolled out inside Google Ads accounts on July 6, 2026. It lets you update your target to match recent actual performance, set a brand-new target, or switch the campaign to Maximize Conversions if you'd rather prioritize volume over a fixed target. Google will not act for you — the tool is there so you can decide before August 17.
It depends on your goal. If your priority is raw volume and you're comfortable letting CPA float, switching a budget-limited campaign to Maximize Conversions keeps bidding focused on spending the full budget for as many conversions as possible. But once you remove the target, your CPA or ROAS will fluctuate as you change budgets. If a specific, profitable CPA matters more than volume, keep a target and set it to a realistic number.
Your campaign keeps running with its current settings, but performance will start aligning to the target you have set. If that target is higher than what you've actually been achieving, expect cost per conversion to climb toward it and volume to fall for the same budget. Doing nothing is only a good choice if your current target already reflects the performance you truly want.
Sources & further reading
Google Ads Help: bidding updates for budget-limited campaigns
Google's official documentation on the Target CPA / Target ROAS change and the Bid Target Adjustment Tool.
Ginny Marvin — Google Ads Liaison (@adsliaison) on X
Real-time clarifications from Google's Ads Liaison on how the change works and what advertisers should do.
The bottom line
August 17 isn't a threat — it's a forcing function to make your targets honest. Find your budget-limited overperformers, decide whether each one should protect its efficiency, chase a new target, or go all-in on volume with Maximize Conversions, and make the change in the Bid Target Adjustment Tool before the deadline. Do that, and the update becomes a non-event instead of a surprise.
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