If you steer Google Ads with target CPA or target ROAS and regularly come in under the target you set, you have had reason to be pleased: budget-limited campaigns were free to outperform. From 17 August 2026 that ends. Google inverts the logic — and anyone not paying attention may end up paying more.
Since early July the prompts "review campaign targets" or "review portfolio targets" have been appearing in affected accounts. They are aimed at every advertiser whose campaigns were budget-limited at least temporarily during the past twelve months. Here is what changes, who is affected, and what should be done before the date.
1. What changes on 17 August 2026
Until now the interplay of budget and target under target CPA (tCPA) and target ROAS (tROAS) worked like this: if a campaign was constrained by its daily budget, the algorithm concentrated spend on the cheapest auctions. The result was often an actual CPA well below target — or a ROAS well above it. That sounded good but had a catch: as soon as the budget was raised, performance became unpredictable.
From 17 August 2026 the system optimises consistently towards the target value you entered — regardless of whether a campaign is budget-limited, and including when budgets change. Important: Google changes neither your targets nor your budgets automatically. Adjusting them remains entirely your job.
2. The mechanics: how bidding behaviour changes
Google illustrates the change with a simple example. A campaign with a target CPA of €10 was budget-limited and actually achieved only €5. Before 17 August that stayed that way — an apparently good state that shifted unpredictably with every budget increase. After 17 August the actual CPA moves step by step towards the €10 target, because the algorithm uses the room it has gained to buy more volume.
Target ROAS works as the mirror image. A campaign running at 800 % against a 400 % target can now fall towards 400 % — the algorithm uses the headroom to generate more revenue volume instead of continuing to serve conservatively.
Schematic Google example: target CPA €10, actual CPA before the update around €5. As of August 2026.
3. Affected campaign types, strategies and platforms
Only automated bidding strategies with an explicit target value are affected:
- Target CPA (tCPA): classic cost-per-acquisition steering.
- Target ROAS (tROAS): steering on return on ad spend.
- Target CPC: demand gen campaigns only.
At campaign level, Search, Shopping, Performance Max, Demand Gen (including target CPC) and Travel are affected. For Display and Hotel the new behaviour has applied for some time. Not affected are app campaigns, reach-oriented video campaigns and CPV video campaigns. Technically the change takes effect in Google Ads, Search Ads 360, Display & Video 360 (for demand gen), in the Google Ads Editor and through the API. SA360 customers with portfolio strategies get their own prompt asking them to review at portfolio level.
4. What is NOT affected — avoiding the misunderstandings
- No intervention in the auction. The mechanics of the Google Ads auction are unchanged; only the bidding behaviour of the target strategies adapts.
- No automatic extra spend. Daily and monthly limits continue to apply without exception. The update does not raise your spend by itself.
- Campaigns that are not budget-limited stay untouched. They already optimise towards the target value and continue to do so unchanged.
- Manual CPC, target impression share and target CPM are not affected in principle — nor are "maximise conversions" or "maximise conversion value" without a target value set.
5. The risks of doing nothing
It gets critical with campaigns carrying an outdated target — a target CPA of €50 set two years ago, say, while the campaign has been converting at €30 for months. Do nothing and from 17 August you risk:
- a rising actual CPA, or a falling actual ROAS, towards the outdated target;
- a shift in conversion volume and in the query or audience mix;
- a redistribution of spend across channels in Performance Max and demand gen;
- a temporary period of fluctuation while the algorithm recalibrates;
- in lead generation: more volume, but potentially more expensive or less qualified leads, if the target no longer reflects your true acquisition costs.
That does not have to be bad news. If your target genuinely matches your profitability threshold, the algorithm now uses the headroom to buy more volume or more revenue value — with behaviour that is finally predictable when budgets rise.
6. The bid target adjustment tool: your four options
Since 6 July 2026 the bid target adjustment tool has been available in affected accounts. The "review campaigns" prompt opens a list of all affected campaigns together with their current performance against the target set. Next to campaigns significantly beating their target, an "apply" link appears. A pencil allows a target value of your own; an export icon downloads the full list.
Four options are on the table:
- 1. Keep the target value — if it correctly reflects your actual profitability threshold. Performance converges towards the target and the algorithm buys more volume.
- 2. Adjust the target to actual performance — one click on "apply" sets the target to current values and locks in today's profitability.
- 3. Set an intermediate value of your own — halfway between actual and old target, say, to buy more volume in a controlled way. The bid simulator helps with the estimate.
- 4. Switch bidding strategy — to "maximise conversions" or "maximise conversion value", if the budget is strictly fixed and a fluctuating CPA or ROAS is acceptable.
With portfolio strategies and shared budgets the adjustment has to be made at portfolio or budget level; with a limited shared budget the effect spreads evenly across all campaigns in the group. Imported and offline conversions also feed fully into the new logic — so poorly calibrated offline tracking distorts the target optimisation directly.
7. Action plan: five steps before 17 August
Step 1 — identify campaigns that were budget-limited in the past twelve months. Do not rely on today's "limited by budget" status: Google triggers the prompts for campaigns that were limited at any point in the past twelve months. Check the "search lost impression share (budget)" column across several periods, and look ahead to seasonal peaks.
Step 2 — compare target and actual performance per campaign. For each affected campaign set target CPA against actual CPA (30 and 90 days), or target ROAS against actual ROAS. The gap between target and actual is your risk indicator.
Step 3 — derive the "right" target from your business figures. For e-commerce, target ROAS is roughly 1 divided by your acceptable margin (including returns and logistics costs). For lead generation, target CPA follows from average customer value times lead-to-customer conversion rate times the acceptable share of revenue. Check the reliability of your tracking as well — imported conversions count too.
Step 4 — decide with the bid target adjustment tool. Choose deliberately between the four options for each campaign rather than reflexively clicking "apply" everywhere: that secures profitability but gives away the volume the original target would have allowed.
Step 5 — plan budgets with headroom. Google recommends keeping daily budgets noticeably above average spend so campaigns are not limited. Consider bundling campaigns into portfolios or shared budgets to make better use of constrained budgets.
8. After the rollout: what to watch
Keep a daily eye on spend, actual CPA and ROAS against target, conversion volume and value, impression share, and the distribution of spend across channels in Performance Max and demand gen. On the business side what counts is lead quality, actual revenue and margin — not platform metrics alone. Between 17 and 31 August be additionally careful with forecasts: the Performance Planner and budget recommendations can be inaccurate in that period while the tools recalibrate. Wait one or two conversion cycles before reaching a final verdict or making larger structural changes.
The update does not stand alone. In parallel Google is rolling out smart bidding exploration — its conceptual counterpart, which grants the ROAS target controlled flexibility to test new queries and audiences. A promotion mode is also in beta: for launches, sales and campaigns it allows a temporarily wider tolerance around the ROAS target together with a temporary budget increase. Taken together, Google's direction is clear: the target value becomes the central lever and the budget is only the frame. The quality of your targets and of your conversion data has never mattered more.
9. Conclusion: target accuracy becomes a competitive advantage
The 17 August update rewards accounts with cleanly calibrated targets and dependable tracking — and punishes accounts on autopilot. Derive your target CPA and target ROAS afresh from real business figures now, and a potential cost trap turns into a genuine steering advantage: predictable performance even as the budget grows.
How to make Google Ads accounts more transparent and controllable in general is covered in our article on Google Ads Performance Max 2026: the key updates. How to secure your tracking before changes like this one is in Tracking audit: when GA4 shows the wrong numbers.
Would you like your Google Ads targets checked by professionals before the rollout? Book a Google Ads account audit or talk to our team with no obligation.
10. FAQ: the key questions about the Google Ads update
What changes on 17 August 2026 in Google Ads?
Budget-limited campaigns using target CPA, target ROAS (or target CPC in demand gen) will optimise towards the target value entered, instead of being able to undercut or exceed it as before — including when budgets are adjusted.
Does Google change my targets or budgets automatically?
No. There are no automatic adjustments. Advertisers have to review and adjust their targets themselves, in particular through the bid target adjustment tool available since 6 July 2026.
Which campaign types are affected?
Search, Shopping, Performance Max, demand gen (including target CPC) and Travel; for Display and Hotel the behaviour already applies. Not affected are app campaigns, reach-oriented video and CPV campaigns, and manual CPC, target impression share and target CPM.
What exactly should I do before 17 August?
Identify every campaign that was budget-limited in the past twelve months, compare target and actual performance, derive the appropriate target value from your margin or customer value, and decide deliberately per campaign using the bid target adjustment tool.
