TL;DR: On 17 August, Google stops letting your daily budget shield you from your stated Smart Bidding targets. Campaigns that are limited by budget and quietly beating their tCPA/tROAS will snap back toward the stated target and lose volume. If you run campaigns marked “Eligible (Limited by budget),” compare each target against actual cost per conversion and step the target down 5–15% at a time now — not in one move — so the algorithm can absorb it without craters. Confirm the budget constraint is real, expect some low-intent volume to disappear, and audit that you’re optimizing toward real conversions first.
A Google Ads change on 17 August could quietly halt the lead flow your business relies on. If your campaigns regularly spend their full daily budgets, you need to review your settings this week. Right now, Google is flexible with your smart bidding rules if your daily budget caps the campaign. When an account runs out of money before it runs out of search demand, the algorithm prioritizes the budget limit over the target.
Imagine you set a target Cost Per Acquisition (tCPA) of $10. The campaign finds cheap traffic in the morning, delivers leads at $5 each, and drains your daily allowance by lunchtime. Google accepts that the $5 is the actual cost. It never forces the system to bid on more expensive clicks later in the day just to reach your $10 setting. The budget limit shuts the auction down early. That makes the budget the only constraint that matters, leaving your stated target as a suggestion rather than a strict rule.
On 17 August, that flexibility disappears. Google will strictly enforce your stated targets, even if the campaign remains budget-limited. If your targets are sitting at a number that the account never actually had to honour, the sudden enforcement will trigger an immediate drop in volume. The algorithm will snap back to the stated target and exit auctions entirely to find it. The change itself is manageable, but absorbing it in a single day risks tanking your sales pipeline overnight.
Google Ads Bidding Mechanics: Why Your Daily Budget Protected You
To understand the risk, you need to look at how the bidding algorithm actually works. The system always juggles two constraints. It includes your daily budget and your performance target (either tCPA or tROAS). Until now, Google treated the daily budget as a hard ceiling and the target as a soft goal.
Think about a local emergency plumber with a $50 daily budget and a $20 target Cost Per Acquisition. The system knows it only has $50 to spend. It looks at early-morning search traffic and grabs the cheapest available clicks. It secures three leads before lunch at $10 each. The budget is mostly gone. The system shuts down the ads for the rest of the day.
Your actual cost per acquisition is $10. Your stated target was $20. The system never bothered trying to push your average closer to that $20 mark because it ran out of money first. It favoured volume over strict compliance. The budget limit acted as a safety net.
Account managers noticed this behaviour years ago. They started setting artificially high targets just to keep the campaign aggressive in the morning auction, knowing the daily cap would step in to protect total spend by the afternoon. The stated target became a loose guideline rather than an absolute rule. The algorithm chased conversions and let the budget cut the cord.
That safety net disappears on 17 August. The system will now force the campaign to hit the stated target on a 30-day rolling average. It will do this even if the daily budget is small. If the account delivers $10 leads on a $20 target, the algorithm will register that gap as an error. It will fundamentally change how it bids to fix the discrepancy.
As Anu Adegbola said in her article on Search Engine Land, “Google is tightening the relationship between target-based bidding goals and actual campaign performance.”
How to Fix Your Google Ads Bids Before August 17th
Ameet mapped this out for our internal teams, and the fix is simply to step the targets down gradually before the deadline. Once you are inside the main Campaigns view of your Google Ads account, set the date range to the last 30 days.
You only care about a single label in the “Status” column. Filter for any campaign marked “Eligible (Limited by budget)” and leave everything else alone. If a campaign hits its target and never touches its daily cap, this update won’t touch it. You only care about the budget-bound ones.
Now look at the target setting against the actual performance. Pull up your “Target CPA” and “Cost / conv.” columns side by side. If your target CPA is $50 but the actual cost last month was $30, that $20 gap is the liability. Under the old rules, it didn’t matter. On 17 August, it’ll break the campaign.
Google’s new guidance is to set the target exactly to recent actual delivery, with no leeway buffer. Google is also rolling out a Bid Target Adjustment Tool to help you spot affected campaigns, but you can’t make that jump in one move. Bidding algorithms run on a 30-day rolling average. Dropping a target by 40 percent today causes the system to panic and exit the auction entirely to recalculate. Your volume craters.
Cap your adjustments at 5-15 percent at a time. If the target is $50, drop it to $45. Then wait. The system needs a few days to absorb the change and stabilize. Once the campaign shows it can still win auctions at the new bid, make the next cut down to $41.
Keep repeating this until the setting matches reality. Small increments take weeks to bite fully. Moving early is the only way to protect your lead flow.
Three Structural Checks Before Adjusting Targets
Before you start lowering targets across the board, pause. Treating every campaign the same creates problems that didn’t exist yesterday. You need to verify three things.
First, confirm the budget constraint is real. We covered this in the audit steps, but it matters. Campaigns that hit their targets well within their daily budget won’t feel this change. If an account spends $40 of a $100 daily limit and consistently hits its $10 target CPA, the algorithm is already operating under the target rule. The budget isn’t the constraint. Leave it alone. Applying a step-down strategy to a healthy, unconstrained campaign will just throttle your reach.
Second, accept that some volume will vanish. The goal isn’t to protect your old conversion numbers at any cost. If a target was quietly being ignored, some of that volume was never going to hold anyway. You were likely picking up low-intent clicks that converted at $4 because the system was simply trying to burn the budget fast. When you finally enforce a realistic $12 target, those $4 outliers might disappear. Let them go. You want a target that is realistic and enforced, without paying for the transition in one ugly week.
Third, audit the actual conversion events. This is a good moment to check what your campaigns are optimizing toward in the first place. A strict target is only as useful as the data feeding it. Look at your conversion actions in Google Ads. Are you tracking actual sales and booked consultations, or are you counting newsletter signups and people who clicked the contact page?
If the system is optimizing against form fills that don’t become customers, enforcing that target more strictly just means hitting the wrong goal more precisely. You will end up ruthlessly efficient at buying useless leads. Fix the conversion tracking before you adjust the bids.
What to Ask Your Google Ads Agency This Week
If you work with an agency, you need to ask them a specific question this week. Don’t wait for the monthly reporting call.
Ask them this: “Which of our campaigns are currently budget-limited, and what is the schedule to step those targets down before 17 August?”
If the answer is a blank look, you have a problem. The algorithm doesn’t care if your account manager was on holiday. The deadline is hard-coded into the auction.
If you want to pressure-test your own account or grade your agency’s plan before the date hits, download our Performance Gap Checklist.