Last Updated on September 8, 2026
On 17 August, Google changes how automated bidding works, and most business owners will not notice until the money has already moved.
It is a quiet change. No new dashboard, no email you will actually read, no button to press. But if you run Google Ads for a shop or a service and you have ever typed a target into the system and walked away, this one lands on you.
What is actually changing
If you use Google Ads, you have probably used automated bidding. You tell Google a goal, and Google sets the bids. The two common goals are Target ROAS (the return you want on each pound) and Target CPA (the most you will pay for a sale or lead).
Here is the part nobody mentions. For a long time, plenty of campaigns have been beating their targets. You asked for a 400% return and quietly got 550%. That was not luck. It usually happened because your daily budget was too small to chase every auction, so Google only went after the best ones.
From 17 August, Google stops treating your target as a floor to beat and starts treating it as the number to hit. Ask for 400%, and it will work to give you roughly 400%, not the 550% you had been enjoying.
Why it matters for a business
Think of it like a builder. You say your ceiling is £10,000. They finish for £8,000 and you are delighted. Now imagine they start spending closer to £10,000 simply because you said you could. Nothing was agreed differently. You just left room, and the room got used.
That is the shift. For budget-limited campaigns running Target ROAS or Target CPA, this can mean lower returns, higher costs, and a different spending pattern, all without you changing a thing.
| Before 17 August | After 17 August |
|---|---|
| Budget cap held Google back | Google aims at your exact target |
| Campaigns often beat target | Campaigns hit target, no more |
| Old target = safety margin | Old target = live instruction |
The mistake most businesses make
The mistake is set and forget. Owners treat an automated bidding target as a wish, something to aim vaguely towards, when it has always been a live control. Most people set a ROAS or CPA target once, often years ago, and never look at it again.
That was survivable while your budget cap was quietly protecting you. It is not survivable now. A number you picked when your margins, prices and costs were different is about to be enforced to the letter.
What to do before 17 August
This is a Build problem, not a Scale one. Before you spend more or chase new channels, fix the setting you already have. It takes an hour.
1. Find out if this even affects you. Only campaigns using Target ROAS or Target CPA that are limited by budget are in scope. If you are not sure, that uncertainty is the real issue, and it is worth ten minutes to check.
2. Look at whether you are beating your target. If a campaign has been running at 550% against a 400% target, that gap is what you stand to lose. Now you know where to look.
3. Set the target you actually want today. Not the number you typed in 2024. Check your current margins and decide what return keeps you profitable now, then set that.
4. Diarise a check for the following week. Watch cost and return for seven days after the change. If performance drifts, adjust the target, because now the target is the lever that moves it.
The takeaway
Automation does not remove the need to pay attention. It just moves where the attention has to go. Google is not going to make your ads worse on 17 August. It is going to do exactly what you told it to, which is a very different thing from what you meant. Go and check what you told it.
