If you’re running ecommerce campaigns at a target CPA or target ROAS and either of them remain “Limited by budget,” Google’s August 17 bid changes will move your numbers, and we’re probably not talking about what you want. Starting August 17th, campaigns that are limited by budget and using a target-based bid strategy will consistently deliver on the targets you set instead of missing them. For many accounts that have been quietly hitting their targets, that means higher costs per conversion or lower ROAS unless you act first.
This is not an opt-in; Google uses it automatically for qualified campaigns, and it won’t adjust your targeting or budget. The runway is getting shorter by the day. The Bid Target Adjustment Tool went live on July 6, and account notifications are coming now, with the change itself starting to roll out on August 17. That leaves a few weeks to determine, campaign by campaign, whether your overdelivery was a deliberate strategy or just something you never reviewed.
What’s Changing is Goal-Based Bid Review
Today, a campaign limited to a budget and using a target CPA or a target ROAS often exceeds its target, and you can rotate when changing the budget. After August 17, Google is gearing up for actual performance to track closer to the target you’ve set, including when you’re adjusting budgets, making it as predictable as you measure. Take a campaign with a target CPA of $100 that has been bringing in $50 in conversions. After the change, it will go to $100. The update applies to intent-based campaigns across Search, Shopping, Performance Max, Demand Gen, Travel, and Display, while App, Video Access, and Video View campaigns have been removed. In multi-channel campaigns such as Performance Max and Demand Gen, Google also said that you may see traffic shift between channels as the program settles on the target.
Why Budget-Limited Campaigns Overdeliver
A budget-limited campaign that exceeded its goal was usually not a bidding miracle. The budget limit was a real obstacle, so the algorithm didn’t spend all the way to the target. It bought the cheapest modification it could do inside the cap and left all the target headroom untouched. That gap between your actual $50 and your $100 ceiling was the efficiency you were getting for free, because the budget, not the target, was making the limit.
After August 17, the program treats that room as a working room. It will follow more conversions that cost more, pulling your average up to the target you set. In plain words, your target ceases to be a ceiling you rarely touch and becomes a place where the algorithm is aiming. This does not mean that Google will increase your budget in full; it means that the system pulls your actual performance up to the specified target that you have already entered.
Google Ads Link Ginny Marvin has been clarifying the framework publicly, and two points are worth reading for yourself. Bidding targets are meant to be your benchmark for efficiency and spending control, while Increase Conversions and Increase Conversion Value are strategies built for a fixed budget without a target. He also pushed back on the idea that this change Google is telling you to spend more money, so treat August 17 as a reason to make your target more sincere than to loosen it.
The Real Risk is the Target Bid You Never Planned For
Many accounts hold a target CPA or target ROAS as a hard ceiling and never revisit it, because the campaign was failing every month anyway. That target is now live. If your $100 CPA was an aspiration rather than an actual measurement number, or your 400% ROAS goal was a proxy while the campaign was quietly running at 600%, August 17 reveals a gap. Don’t miss it, and it shows up in next month’s report as a cost increase that you have to explain after the fact, which is a much worse conversation than you might be having now.
Budget Limited per campaign decision
For each campaign that is limited by budget and stays comfortably within the target, you have three loyalty options.
Reset the target to your actual performance. If the campaign was running at $50 CPA or 600% ROAS and that’s the performance you want to maintain, update your targets to match before August 17th. The Bid Target Adjustment Tool allows you to use your recent performance as a new target with a few clicks, holding your current numbers in place.
Raise the budget and scale to the target. If over-delivering is really a sign that the campaign could be overspending, raise the budget so that it’s no longer limited by the budget, and let us capture more volume from your original target. This is the way to grow, and it only makes sense when the target shows real profit.
Allow it to drift in the direction of its intended target. If your stated target has always been your original split and you enjoyed a cheap conversion while the budget limit allowed, you can accept the drift referred to and the additional volume that comes with it. The point is to choose it, not inherit it because you forgot to look.
How to Research Your Target Bids Before August 17th
Pull every campaign marked “Budget limited” that uses a Target CPA or a target ROAS. Compare the actual CPA or ROAS to the target specified over the past 90 days, and mark any campaign where the actual is sitting well within the target, because that’s the one that will move. Then apply the above decision to each.
The Bid Target Adjustment Tool, live in accounts since July 6, reveals this historical performance and allows you to use updated targets directly, and the notifications that Google now sends to the place where it thinks you have been exposed, so treat it as a notification to take action instead of recommending to delete them. Another step unrelated to the forum: brief clients or your leadership before August 17, not after. A short note about possible cost changes that explain the surprise in next month’s report.
What Review Means for Ecommerce PPC
Many of the most active “Budget-limited” accounts are small and medium-sized stores, which are a large segment of ecommerce. On the Shopping and Performance Max side, there are two things to watch.
First, if you’re using Target ROAS on a Shopping or Performance Max campaign with a budget that’s been exceeding its target, the drift to targeting shows up as lower ROAS and more spend on marginal conversions. In a low-margin catalog, that can quietly wipe out the profit you thought the campaign was printing. Reset the target to your original ROAS floor, ideally built from contribution margin rather than a round number, before the change hits you.
Second, because Performance Max is spread across Search, Shopping, YouTube, and more, Google said you may see traffic shifts between channels as the system balances. Watch your channel level reports in the weeks after August 17th so that the move to cheap, low-target content doesn’t slip past you.
Where Smart Bid Testing Fits In
If your honest reaction is to take on more volume, now there is a deliberate lever for that, instead of letting the drift of August 17 waste your headroom anywhere. Smart Bidding Exploration, which Google expanded on June 15, allows you to set ROAS tolerances so that the algorithm can bid on frequently skipped queries, extending reach beyond your current query coverage while staying within the threshold you define. Available globally for Performance Max campaigns without product feeds, and in beta for Shopping and Performance Max with feeds through your Google account team. Google reports that its testing showed an 18% lift in unique conversion queries and a 19% lift in conversions, which are Google’s statistics rather than independent, so treat them as a guide.
The point of ecommerce is control. The August 17 change will use up your headroom whether you want it or not. Smart Bidding Exploration allows you to determine how much headroom goes into exploration and what efficiency, which is a cleaner way to buy incremental volume than getting it from a report after the fact. Google also introduced the Promotion Mode in the beta of Search and Performance Max, which organizes a temporary budget and ROAS tolerance improvement for a defined maximum window and then closes itself, so it is worth looking at the flash sales and launch in Q4.
Things to Do Before August 17th
The August 17 bidding change rewards one discipline, which uses terms that reflect actual business figures instead of placeholders. Check all budget-limited campaigns and using Target CPA or target ROAS, decide for each campaign whether to reset the target, increase the budget, or accept drift, and use the Bid Target Adjustment Tool, live now, to lock in the desired performance before the system adjusts it for you. If you’d rather buy high volume on purpose rather than inherit it, Smart Bidding Exploration is a safe bet for you. Deductible accounts will be those that treat bid targets as set and forget ceilings, and this change turns all of those ceilings into live targets.
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