By Cody Wise, founder of Wise Media. Last updated 22 September 2026. General information about Google Ads bidding behaviour, not advice about your specific account.
Summary
If your Google Ads cost per conversion rose in the second half of August 2026 and nobody touched the account, the most likely cause is a bidding change Google made on 17 August 2026. Campaigns with a “Limited by budget” status running Target CPA, Target ROAS, or Target CPC for Demand Gen now deliver toward the target you set instead of beating it. If your target said $80 CAD and the campaign had been quietly producing conversions at $45 CAD, it is now working its way toward $80 CAD, exactly as instructed. Google has confirmed the global rollout completed on 27 August 2026 and states it will not adjust your targets or budgets for you. The fix is to reset the target to the number you actually want.
Table of contents
- What actually changed on 17 August 2026
- Is this your problem? A decision tree
- Why this hit Canadian small advertisers harder
- How to fix it, step by step
- Four things this change is not
- If it is not this, here is what else moves a CPA
- Mistakes to avoid right now
- FAQ
What actually changed on 17 August 2026
Google changed how budget-limited campaigns treat a bid target. In Google’s own words from its help documentation, campaigns that are limited by budget and use a target-based bid strategy now perform more consistently toward your bid target, including when you make budget adjustments.
Before the change, a campaign constrained by its daily budget could systematically overachieve its stated target. You set a Target CPA of $80 CAD, the budget ran out before the system could spend up to that number, and you got conversions at $45 CAD. Advertisers came to read that gap as performance. Google read it as unpredictability, because the moment you raised the budget the CPA lurched and nobody could forecast the result.
Google’s stated reasoning on its FAQ page is that the old behaviour “can be confusing and create unpredictable results when budgets are adjusted,” and that optimising consistently toward the target regardless of budget provides more reliable control and predictable scaling.
Google’s own example is the clearest statement of the consequence: if your campaign’s Target CPA is $10 but your recent actual CPA performance is $5, your campaign now delivers more closely to a $10 actual CPA.
The date most coverage gets half right
Almost every article on this change was written in the week before 17 August and stops there. Google’s FAQ page now states that the change rolled out globally on 17 August 2026 and that the global rollout was completed on 27 August 2026, with the new bidding behaviour fully live across all affected accounts.
That ten-day window matters for one practical reason nobody mentions. Google states on the same page that its planning tools, including Performance Planner, were updated to reflect the new behaviour but that there was a short transition period during the rollout where forecasts had minor inaccuracies, and that forecasting models fully stabilised after the rollout completed on 27 August. If you or your agency built a Q4 budget off a forecast pulled between 17 and 27 August, pull it again.
Exactly what is in scope
| Dimension | Affected | Not affected |
|---|---|---|
| Budget status | Campaigns with “Limited by budget” status | Campaigns not constrained by budget |
| Bid strategy | Target CPA, Target ROAS, Target CPC (Demand Gen only) | Manual CPC, Target Impression Share, Target CPM |
| Campaign type | Search, Shopping, Performance Max, Demand Gen, Travel | App campaigns, Video reach, Video view (VVC) |
| Already behaving this way | Display, Hotel | |
| Platform | Google Ads, Search Ads 360, Display & Video 360, Google Ads Editor, Google Ads API | |
| Conversion types | All types and sources, online and offline, including click-through, view-through and engaged-view | |
| Budget structures | Portfolio bidding and shared budgets | Campaign total budgets (behaviour unchanged) |
Two details in that table are easy to miss and both come straight from Google’s FAQ. For portfolio strategies with non-shared budgets, only the budget-constrained campaigns are affected. For constrained shared budgets, the impact is distributed uniformly across every campaign in the group, and any target adjustment has to be made at the portfolio or shared budget level rather than campaign by campaign.
Is this your problem? A decision tree
Work through this in order. Stop at the first line that matches. Total time, about ten minutes in the account.
- When did the CPA start rising? If the rise clearly predates 17 August 2026, this change is not your cause. Skip to the other causes section below.
- What bid strategy is the campaign on? If it is Manual CPC, Maximize conversions, Maximize conversion value, Target Impression Share or Target CPM, this change does not apply. Google says so directly.
- What campaign type is it? If it is an App campaign, a Video reach campaign or a Video view campaign, it is excluded and continues on the previous bidding behaviour.
- Was the campaign ever “Limited by budget”? Check the status column, and check the change history and budget reports for the twelve months before August. Google triggered its service announcements for advertisers with any campaign limited by budget in the last twelve months, which is a wider net than current status alone.
- Was your actual CPA below your Target CPA before 17 August? Pull a date-range comparison: 1 July to 16 August versus 28 August to today. If the earlier period shows actual CPA materially under target and the later period shows it climbing toward target, you have your answer.
- Did spend stay inside budget? It should have. Google is explicit that daily and monthly budget limits are always respected and that this change does not directly increase spend. If your spend exceeded budget, that is a separate problem.
If you matched at step five, this is the bidding change and it is working as designed. Your campaign is not broken. It is finally doing what the target field told it to do.
The signature to look for
- Spend flat or near flat, because the budget cap has not moved
- Conversions down
- Cost per conversion up, drifting toward your stated target rather than spiking randomly
- Impression share and click volume roughly stable or up slightly
- No change in the account by you or anyone else
Drifting toward a specific number is the tell. A tracking break produces a cliff. Auction pressure produces a rising CPC. This produces a curve that bends toward whatever figure is sitting in your target field.
Why this hit Canadian small advertisers harder
Most platform changes land hardest on large accounts. This one is the reverse, and the reason is structural rather than geographic.
The change only reaches campaigns that are limited by budget. A national retailer running unconstrained budgets is untouched. A Calgary trades business, a Canadian clinic, a regional professional services firm running $40 to $100 CAD a day is very often capped, because in most competitive Canadian service categories a few clicks consume a daily budget before lunch. Being permanently budget-limited is the normal state of a Canadian small-business Search account, not an edge case.
There is a second, quieter reason. Small accounts are exactly where stale targets live. A Target CPA entered eighteen months ago during setup, never revisited because the campaign was performing, is the precise configuration this change punishes. Larger accounts with dedicated management revise targets quarterly and were mostly already aligned.
Google also notes that it does not calculate a recommended target for campaigns with fewer than seven conversions, on the grounds that performance for those campaigns is unpredictable. Plenty of Canadian SMB campaigns sit under seven conversions in a reporting window, which means the account that most needs the recommendation is the one least likely to be shown one. Those advertisers have to set the number manually.
How to fix it, step by step
Google will not do this for you. Its documentation states plainly that Google does not automatically adjust your bidding targets or budgets.
Step 1. Find your real historical CPA
Pull actual cost per conversion for a clean pre-change window, for example 1 June to 16 August 2026, at campaign level. Ignore the target. You want the number the campaign was genuinely delivering. If the business was profitable at that number, that is your new target.
Step 2. Open the Bid Target Adjustment Tool
Google shipped a tool for this and it is live. Two routes inside Google Ads:
- From notifications. Sign in, find the banner headed “Review your campaign targets” at the top of the dashboard or under the Notifications icon, then click Review campaigns.
- From the Campaigns page. Campaigns icon, then the Campaigns drop-down in the section menu, then Campaigns. Next to the campaign, click the Settings gear, select Bidding, then Review campaigns.
- Search Ads 360. The tool does not appear in your Google Ads account. Log into Search Ads 360 and click Review bid strategies in the notifications banner.
If you cannot see the tool, Google says it becomes available automatically in the relevant campaign settings page as deployment continues. You can still set targets manually in the meantime.
Step 3. Choose one of four responses
| Option | Do this when | Expect |
|---|---|---|
| Keep the current target | The target genuinely reflects what a conversion is worth to you | Performance moves toward that target. More volume, higher CPA |
| Match the target to recent performance | You want to hold the economics you actually had | Performance stays close to where it was. Click Apply in the tool |
| Set a custom target | Neither the old target nor recent performance is the right number | Performance trends toward your number. Model it with the bid simulator first |
| Switch to Maximize conversions or Maximize conversion value | Your budget is genuinely fixed and you accept efficiency fluctuating | Full budget spent, no target, CPA or ROAS moves as budget moves |
For most Canadian small advertisers who were quietly beating their target, option two is the correct move and it takes one click.
Step 4. Wait before you judge it
Google recommends waiting one to two conversion cycles before evaluating actual performance in the bid strategy report, and repeats that guidance for long conversion delays. Smart Bidding reacts to target changes in real time, large or small, so phasing adjustments is not required. What is required is not re-adjusting on day three because the first forty-eight hours looked odd.
Step 5. Deal with the budget question properly
The upside of this change, and Google is explicit about it, is that you can now raise budget without the efficiency lurch that used to follow. Previously, increasing the daily budget on a budget-limited campaign with an overperforming target strategy would likely produce fluctuations or decreases in performance. Now the campaign optimises consistently toward the stated target regardless of the budget limit.
Google’s own guidance is to maintain a daily budget comfortably higher than average daily spend so the campaign is not restricted, check the Recommendations page for forecasts of additional conversions at your target, and evaluate after one to two conversion cycles.
If raising budget is not available right now, Google’s stated advice is to provide as much budget buffer as you can during constrained periods, adjust targets to manage spend, and consider consolidating campaigns under portfolio bidding or shared budgets to make better use of limited budget. That consolidation point is worth taking seriously in small Canadian accounts, where five thin campaigns sharing one small budget is a common and avoidable structure. We covered budget sizing for Canadian small businesses in how much to budget for Google Ads in Canada.
Four things this change is not
- It is not an auction change. Google states directly that this is specifically a bidding change and that auction mechanisms are unchanged.
- It is not a spend increase. Google states it will not directly result in increased spend and that daily and monthly budget limits are always respected. If your spend rose, look elsewhere.
- It is not a penalty. Nothing about your account quality changed. The system is following the instruction in the target field more literally than it used to.
- It is not a reason to restructure. Google advises against applying data exclusions or new bid limits solely in response to this update, on the grounds that doing so can cause performance fluctuations.
One more, for completeness. Campaigns using Smart Bidding Exploration are generally not impacted, since that feature works best with unconstrained budgets and this update reaches budget-limited campaigns.
If it is not this, here is what else moves a CPA
Cost per conversion is a ratio, so it moves when either half moves. Diagnose the halves separately before you touch bidding.
| What you see | Likely cause | Where to look |
|---|---|---|
| Conversions collapsed to zero or near zero on a specific date | Conversion tracking broke | Tools, Conversions. Check tag status and recent site or consent-banner changes |
| CPC up, conversion rate flat | Auction pressure, new competitors, seasonality | Auction insights, impression share lost to rank |
| Clicks up, conversion rate down | Traffic quality or landing page | Search terms report, landing page speed and form behaviour |
| Conversions flat but reported CPA moved | Attribution or conversion window change | Attribution settings, conversion action configuration |
| Google Ads, Meta and GA4 now disagree | Measurement, not performance | Our attribution guide |
| Leads arriving but not converting to customers | Follow-up speed, not the ad account | Our speed to lead system |
The last row is the one agencies underweight. A rising cost per conversion and a rising cost per customer are different problems with different owners. If the ads are producing leads at the same rate and the same cost but revenue fell, the issue is downstream of the click and no amount of bid target tuning will reach it.
Mistakes to avoid right now
- Pausing the campaign. You lose the learning and the data, and the underlying economics were fine a month ago.
- Cutting the target aggressively “to be safe.” An unrealistically low target starves delivery. Set it to what the campaign was genuinely achieving, which you can measure.
- Adjusting again after two days. Wait one to two conversion cycles, per Google’s guidance.
- Applying data exclusions or bid limits in response. Google specifically advises against this.
- Trusting a forecast pulled between 17 and 27 August. Google says forecasting had minor inaccuracies during the transition and stabilised after the rollout completed.
- Adjusting individual campaigns inside a portfolio strategy. Target changes have to be made at the portfolio or shared budget level.
- Assuming no notification means no impact. Google notes the service announcement uses a longer historical period than the recommendations, and that some affected accounts will see the announcement but no recommendation. Review anyway.
- Blaming the agency without checking the date. The rise starting between 17 and 27 August in a budget-limited target-based campaign is a platform change, not a management failure.
Frequently asked questions
Why did my Google Ads cost per conversion suddenly go up in August 2026?
If the campaign was limited by budget and used Target CPA, Target ROAS or Demand Gen Target CPC, Google changed how those campaigns treat the target on 17 August 2026. They now deliver toward the stated target rather than beating it. A campaign that had been outperforming its target will drift up toward that target unless you lower it.
Does this change affect campaigns that are not limited by budget?
No. Google states that Target CPA and Target ROAS campaigns that are not budget-constrained do not change behaviour, and that campaigns with unconstrained budgets scale performance in line with the stated target as they did before.
Will this change increase my Google Ads spend?
Google states it will not directly result in increased spend, and that daily and monthly budget limits are always respected. What changes is what you get for the same budget: typically fewer conversions at a higher cost each, unless you lower the target.
Which bid strategies are affected?
Target CPA and Target ROAS across most campaign types, plus Target CPC for Demand Gen campaigns. Manual CPC and Target Impression Share are not affected. App campaigns, Video reach campaigns and Video view campaigns continue with the previous bidding behaviour.
Did Google adjust my targets automatically?
No. Google states in both its main article and its FAQ that it will not automatically adjust your bidding targets or budgets. Any adjustment is yours to make, either through the Bid Target Adjustment Tool or manually.
Why is there no recommended target on some of my campaigns?
Google does not calculate a recommended target for campaigns with fewer than seven conversions, because performance for those campaigns is unpredictable. You are still encouraged to review those campaigns and set the target manually against your business goals.
When did the rollout finish?
Google states the change rolled out globally starting 17 August 2026 and that the global rollout was completed on 27 August 2026, with the new bidding behaviour now fully live across all affected accounts.
How long should I wait after changing a target?
Google recommends waiting one to two conversion cycles before evaluating actual performance in your bid strategy report. Smart Bidding reacts to target changes in real time, so the waiting is for your measurement, not for the system.
The bottom line
This change converted a target from a ceiling you hoped to beat into an instruction the system follows. That is arguably better, because a number you can rely on is more useful than a number you were quietly outperforming by an amount nobody could predict. But it only works if the number in the field is the number you actually mean, and for a great many Canadian small-business accounts it has not been touched since setup.
Go and look at what your campaigns were actually delivering before 17 August. Put that number in the target field. Then give the budget some headroom, because for the first time raising it is not a gamble.
If you would rather have someone audit the account, reset the targets and rebuild the measurement underneath them, that is what our paid advertising packages cover, and the tracking and landing page work sits inside our website growth packages. Send us your account details through the intake form and we will tell you what we find.
Sources
- Google Ads Help, Changes to target based bid strategies
- Google Ads Help, Frequently asked questions about changes to Target-based bid strategies
- Google Ads Help, About the Google Ads auction
- Google Ads Help, Bid simulator