Key takeaways
- From 17 August, budget-limited Target CPA and Target ROAS campaigns will optimise closer to your set target instead of quietly outperforming it.
- Google is not increasing budgets or changing your targets automatically. If you want to keep current performance, you must lower your target yourself first.
- Capped budgets no longer act as an efficiency lever. Budgets now control spend, targets control efficiency, and the two are being deliberately separated.
- Re-baseline any capped campaign beating its target by 20% or more, and update forecasts so a target-driven CPA rise is not misread as failure.
- Fix conversion tracking before changing any target, because a target is only as reliable as the data feeding it.
If your budget-limited Target CPA or Target ROAS campaigns have quietly been beating their targets, the Smart Bidding budget update arriving on 17 August will take that hidden efficiency away. Google is changing how capped campaigns behave: instead of hunting only the safest, cheapest auctions and landing well under your target, Smart Bidding will optimise more closely toward the number you actually set. A campaign averaging a £20 CPA against a £35 target is exactly the type Google intends to pull upward.
This matters for every UK team that leans on automated bidding, budget caps and performance forecasting. Many advertisers have treated a tight budget as a de facto efficiency lever, and that lever is being redesigned. We flagged the direction of travel in our note on target-based bidding changes for capped campaigns, and the clarifications since then confirm the mechanics.
The change is not a spend grab. But it does rewrite how you should read and manage capped accounts.
What’s actually changed on 17 August
Google announced the shift on 22 June and clarified it after advertisers pushed back. The mechanics are narrow but important. Today, budget-limited Target CPA and Target ROAS campaigns often outperform their targets because Smart Bidding enters only the auctions most likely to convert cheaply. Google says that over-performance was never the intended behaviour.
From 17 August, Smart Bidding will optimise capped campaigns more closely toward the target you configured. Google has been explicit about what does not change: budgets will not automatically increase, and your Target CPA or Target ROAS settings will not be altered for you. The company is rolling out account notifications and a Bid Target Adjustment Tool to flag affected campaigns. If you want to keep today’s stronger-than-target performance, you lower your target yourself before the rollout.
Why this Smart Bidding budget update matters for advertisers
Here is the mechanism, because the phrasing “optimise toward your target” hides where the money moves. A capped campaign delivering conversions at £20 against a £35 target is leaving room on the table by Google’s definition. The system has favoured exploitation over exploration: it grabbed the cheapest wins and stopped. After the update, it will spend the same budget across a wider set of auctions that still satisfy your £35 target. Same spend, more conversions in theory, but each conversion costs more. Your blended CPA drifts from £20 toward £35. Nothing in the account will be labelled “Smart Bidding update”. It will look like your efficiency slipped.
That is the trap. If your reporting and your board expectations are anchored to that £20, the update quietly resets the baseline and you look worse against your own history. Ecommerce teams running Target ROAS feel this most sharply, because a ROAS that had been sitting comfortably above target settles back toward the configured floor, and revenue-per-pound forecasts built on the old behaviour stop holding.
Predictable scaling is the actual trade
Google’s defence is scaling. Take a campaign at an £8 CPA against a £12 target. Double the budget today and the CPA can lurch to £16 instead of holding near target, because the extra spend chases weaker auctions unpredictably. Google argues the update makes that behaviour consistent: bids track your target as budgets move, so a budget increase produces a forecastable result rather than a nasty surprise. That is a genuine benefit for teams that scale by adjusting budgets. It is also a real cost for teams that quietly banked the over-performance.
The uncomfortable truth is that capped budgets have functioned as an efficiency lever for years, and Google is separating the two controls on purpose. Budgets control spend. Targets control efficiency. Once the update lands, a low budget will no longer buy you an artificially strong CPA. If you have been managing efficiency by starving budgets, you now manage it through targets, and that is a different discipline. This sits alongside the wider direction we covered in why signal quality now decides paid search, where Google keeps taking manual proxies away and forcing advertisers to control outcomes directly.
PPC Geeks’ View
The specific problem we expect to see across UK accounts is silent target drift on capped campaigns that nobody re-baselined. A retailer with a Target ROAS of 400% that has been quietly hitting 550% on a capped budget will settle toward 400% after 17 August, revenue forecasts will fall short, and the first assumption will be that “the campaign broke” rather than “Google did exactly what it said”.
We see this pattern most often in lead-gen and ecommerce accounts where the target was set once, months ago, and never revisited because performance looked healthy. The target no longer reflects reality. It reflects a number someone typed during setup. When Google starts obeying that number literally, the gap between the typed target and true performance is where budget leaks.
The clean signal here connects to how much capped spend already goes unspent. Our Q2 2026 impression-share analysis found the median account loses about 18% of its search clicks to capped budgets, and nearly two in three accounts (39 of 62) lose more than 10%. That is an opportunity, not a “spend more” nag: the point is knowing which missing clicks are worth chasing, not raising budgets blindly. This update makes that judgement sharper, because the auctions Smart Bidding starts entering are the ones your old cap was hiding.
Reset your targets to match real performance before Google resets them for you. A target you set and forgot is not a strategy, it is a default the system is about to enforce.May Dayang, Digital Marketing Coordinator, PPC Geeks
This is exactly the type of issue we look for in a free Google Ads audit, especially where automation, budget caps and target settings quietly drift out of line with actual account performance.
What advertisers should do next
Do not wait for the account notification. Work through this before 17 August.
- Segment your capped campaigns by target gap. In Google Ads, filter Search and Shopping campaigns to those flagged as “limited by budget”, then compare each campaign’s actual CPA or ROAS against its configured target. Any campaign more than 20% better than target is a re-baseline candidate.
- Reset the target to your real number, not the old one. For a campaign averaging £20 against a £35 Target CPA, decide whether £20 is now your genuine goal. If it is, set the target to £20 before the rollout to hold performance. Leaving £35 in place lets efficiency drift up to it.
- Rebuild forecasts on the new baseline. If your revenue or lead models assume the over-performing figures, update them now. Tell finance and stakeholders the baseline is moving, so a target-driven CPA rise is not misread as a campaign failure in September.
- Use the Bid Target Adjustment Tool as a cross-check, not a decision. It identifies affected campaigns, but the target you set is a commercial call about profit per conversion, not one to hand to a tool.
- Decide your scaling plan per campaign. Where a campaign is genuinely worth more volume, the update makes budget increases more predictable, so plan the budget lift and the target together. Where profit is tight, lock the target down first.
- Check tracking before you change any target. A target is only as trustworthy as the conversion data feeding it. If your conversion import lag or offline data is patchy, you will set the wrong number. Fix measurement first.
If you manage several accounts or lack the hours to work through capped campaigns one by one, this is where a specialist Google Ads agency earns its fee, by re-baselining targets deliberately rather than reactively.
What this means for your campaigns
The Smart Bidding budget update is not Google becoming less intelligent, and it is not a demand to spend more. It is Google enforcing the targets you set and removing the accidental efficiency that capped budgets used to hand you. Advertisers who keep targets aligned with real performance will see fewer surprises when they change budgets. Advertisers who ignore it will watch CPAs drift toward stale targets and blame the wrong thing.
Ginny Marvin was direct that the change will not alter spend on an already budget-constrained campaign, as reported when Google clarified the update after advertiser concerns, and Google’s guidance is to bring targets in line with your goals. The action is yours to take. Treat 17 August as a deadline to re-baseline, not a date to react to afterwards.
This follows the original report by Search Engine Journal.
Want a no-nonsense view of what to change first? Start with a free Google Ads audit from our team. For the detail behind this, see Bidding and Budgeting Updates to Scale Your Growth and Google Ads Bidding Changes: What PPC Managers Need To Know About The 3 Updates.
Frequently asked questions
What exactly changes with the Smart Bidding budget update on 17 August?
Budget-limited Target CPA and Target ROAS campaigns that currently outperform their targets will optimise more closely toward the target you set. Google will spend the same budget across a wider set of auctions that still meet your target, so campaigns beating their target move closer to it.
Will my Google Ads spend increase because of this update?
No. Google has confirmed the update does not change budgets on already budget-constrained campaigns and does not automatically adjust your targets. Spend only rises if you choose to raise the budget yourself.
How do I keep my current strong performance after the update?
Lower your Target CPA or Target ROAS to match your actual performance before 17 August. If a campaign averages a 20 pound CPA against a 35 pound target and 20 pounds is your real goal, set the target to 20 pounds so the system holds that level.
Which campaigns are most affected?
Campaigns marked as limited by budget that have consistently beaten their Target CPA or Target ROAS. Campaigns already hitting their intended target will operate much as they do today.
Is Google making Smart Bidding less efficient?
Google frames it as making performance predictable rather than less efficient. The system had become conservative in capped campaigns, favouring the safest auctions. The update makes it follow your stated target consistently, which trades some accidental over-performance for more forecastable scaling.
Should I use the Bid Target Adjustment Tool to set my targets?
Use it to identify affected campaigns, but treat the target itself as a commercial decision about profit per conversion. The tool flags which campaigns need attention; the number you choose should reflect your business goals and clean conversion data.
