Google Ads 17 August 2026 Update: What Target ROAS & Target CPA Advertisers Need to Check

If your Google Ads performance has changed since 17 August 2026, don't immediately assume your campaign is broken.

Google has begun rolling out a significant change to the way certain automated bidding campaigns behave when they are Limited by budget.

The change particularly matters to advertisers using Target ROAS and Target CPA, including ecommerce businesses running Google Shopping and Performance Max campaigns.

Google says the change is designed to make campaigns perform more consistently towards the bidding target advertisers have actually set, even when campaign budgets are adjusted.

That sounds fairly harmless.

But there is an important consequence.

If your campaign has historically performed significantly better than the target you gave Google, performance may now begin moving closer to that target.

For an ecommerce business working with tight margins, that is something worth checking.

Read Google's official explanation of the 17 August 2026 bidding changes.

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What Changed to Google Ads on 17 August 2026?

Before this update, some campaigns marked Limited by budget could substantially outperform the Target CPA or Target ROAS entered by the advertiser.

Google says this could also lead to less predictable results when advertisers changed their campaign budgets.

From 17 August 2026, Google began globally rolling out changes designed to make affected campaigns optimise more consistently towards the bid target that has been set.

The important phrase here is:

The target you have set.

Google is not necessarily trying to maintain the performance you happened to achieve previously.

It is increasingly trying to deliver towards the performance target you instructed its bidding system to achieve.

That distinction could be important.

Google's Own Target CPA Example Explains the Risk

Google provides a useful example in its official documentation.

Imagine a campaign has:

• Target CPA: £10
• Recent actual CPA: £5
• Campaign status: Limited by budget

Historically, that campaign may have continued generating conversions at approximately £5 despite the advertiser telling Google that a £10 CPA was acceptable.

Under the new behaviour, Google says the campaign may begin performing more closely towards the £10 Target CPA.

That doesn't necessarily mean something has gone wrong with Google Ads.

The system may simply be following the target it was given more closely.

This is why advertisers need to compare two numbers:

1. What target have I configured inside Google Ads?
2. What CPA or ROAS has the campaign actually been achieving?

If there is a substantial difference, this update deserves your attention.

Why Target ROAS Could Matter Even More for Ecommerce Stores

For ecommerce businesses, the same principle applies to Target ROAS.

For example, imagine your Performance Max campaign is configured with:

• Target ROAS: 300%
• Recent actual ROAS: 500%

If the campaign is Limited by budget and has historically overperformed its target, the new bidding behaviour could allow performance to move closer towards the target you actually selected.

Whether that is good or bad depends entirely on your business economics.

If 300% ROAS remains highly profitable, capturing additional conversion volume may be exactly what you want.

But if your business needs 450% or 500% ROAS after product costs, VAT, shipping, payment fees, refunds and other operating costs, a 300% target may no longer represent your genuine objective.

Revenue is not the same as profit.

An impressive-looking ROAS number can still produce an unprofitable ecommerce campaign if the target has been chosen without understanding the store's actual margins.

Which Google Ads Campaigns Are Affected?

According to Google's current guidance, the change applies to campaigns that are Limited by budget and use eligible target-based bidding strategies.

This includes:

• Target CPA
• Target ROAS
• Target CPC for Demand Gen campaigns only

Affected campaign types include:

• Search
• Shopping
• Performance Max
• Demand Gen
• Travel campaigns

Google's FAQ also states that Target CPA and Target ROAS campaigns that are not budget constrained are not expected to change their behaviour as a result of this particular update.

You can read Google's detailed FAQ here: Google Ads FAQ on the target-based bidding changes.

We're Currently in Google's 17–31 August Transition Period

This is one of the most important details for advertisers reviewing campaign performance right now.

Google has confirmed that the new bidding behaviour is being rolled out gradually.

That means two advertisers with similar campaigns may not necessarily see the change at exactly the same time.

Google has also warned that there may be a short transition period where forecasts in tools such as Performance Planner and bid or budget recommendations contain some inaccuracies.

Google specifically advises advertisers to use caution with forecasts between:

17 August and 31 August 2026.

So if you're reading this during August and something suddenly looks different inside Google Ads, avoid making a major decision based on one forecast or one day's performance.

Look at the wider picture.

Does the Update Mean Google Will Automatically Increase Your Budget?

No.

Google says it will not automatically change your campaign's daily budget or bidding target as part of this update.

Your existing budget limits still apply.

The change concerns how Google's bidding systems optimise towards your stated target when the campaign is budget constrained.

This is an important distinction because advertisers often see Limited by budget and immediately assume they should increase their daily spend.

That is not always the correct first move.

Before raising a budget, ask:

• Is the campaign currently profitable?
• Is my configured Target ROAS or CPA genuinely appropriate?
• Has conversion tracking been checked?
• Has recent conversion volume changed?
• Are my margins capable of supporting more spend?
• Have Shopping or Merchant Center issues affected product visibility?

Increasing the budget of a campaign with the wrong target can simply allow it to spend more money towards the wrong commercial objective.

What About Performance Max?

Performance Max is particularly relevant for ecommerce advertisers because one campaign can distribute spend across multiple Google channels.

Google says the overall effect of this bidding update is similar across campaign types, but Performance Max and other multi-channel campaigns may experience changes in how spend is distributed between channels.

That means an ecommerce merchant shouldn't judge the change purely by looking at total campaign spend.

Review:

• Conversion value
• Actual ROAS
• Configured Target ROAS
• Conversion volume
• Average order value
• Product performance
• Merchant Center diagnostics
• Conversion tracking accuracy

Does This Google Ads Update Cause Merchant Center Suspensions?

No. This bidding update should not be confused with a Google Merchant Center policy suspension.

A change in Performance Max or Shopping performance does not automatically mean your Merchant Center account has been restricted.

Merchant Center suspensions, including Misrepresentation, involve separate policy, website, business, feed and trust considerations.

If your Google Ads performance has changed but Merchant Center products remain approved and there are no new policy warnings, bidding behaviour should now form part of your investigation.

On the other hand, if Merchant Center itself is suspended or products are being disapproved, adjusting Target ROAS will not solve the underlying compliance issue.

If you're currently dealing with a suspension, work through our:

Google Merchant Center Misrepresentation: Complete 2026 Shopify Fix Guide

The guide covers areas including business identity, shipping, returns, checkout behaviour, product data, structured data and website-to-Merchant-Center consistency.

Don't Diagnose the Wrong Problem

This is where ecommerce advertising becomes complicated.

A decline in Shopping or Performance Max results could potentially involve:

• Target ROAS or Target CPA settings
• A Limited by budget campaign
• The August 2026 bidding rollout
• Conversion tracking problems
• Changes in search demand
• Product disapprovals
• Feed errors
• Price or availability mismatches
• Merchant Center restrictions
• Website technical problems
• Checkout issues

Those problems require very different fixes.

Changing your bidding target won't repair a Merchant Center feed problem.

Rebuilding your product feed won't fix incorrect conversion tracking.

And repeatedly submitting Merchant Center review requests won't solve a Google Ads bidding problem.

Diagnosis comes first.

What Ecommerce Advertisers Should Check Now

1. Find campaigns marked Limited by budget

Start with the campaigns most directly relevant to Google's update.

Look for Search, Shopping or Performance Max campaigns using Target CPA or Target ROAS that are currently, or have recently been, Limited by budget.

2. Compare your target with recent actual performance

If Target CPA is £20 but recent actual CPA has consistently been £12, understand that difference before making further changes.

The same applies to Target ROAS.

If you have asked Google for 300% while receiving 500%, decide which figure genuinely reflects your business objective.

3. Calculate your real break-even ROAS

Don't pick a target simply because it looks good in Google Ads.

Consider:

• Product cost
• VAT
• Shipping and fulfilment
• Payment processing
• Returns and refunds
• Discounts
• Advertising costs
• Average order value

Your bidding target should make commercial sense for the actual business.

4. Check conversion tracking

Automated bidding depends heavily on the conversion information supplied to Google.

Check for:

• Duplicate purchases
• Missing conversions
• Incorrect conversion values
• Secondary actions accidentally used for bidding
• Changes to tracking or Shopify integrations

5. Check Merchant Center separately

For Shopping and Performance Max advertisers, review Merchant Center diagnostics rather than assuming every performance change comes from Google Ads.

Check:

• Product approvals
• Price consistency
• Availability
• Shipping settings
• Return settings
• GTIN and brand data
• Structured data
• Landing-page consistency

6. Don't judge a major change too quickly

Google recommends allowing approximately one to two conversion cycles before evaluating performance following target adjustments.

That is especially important during the current rollout period.

Google Has Also Released a Bid Target Adjustment Tool

To help advertisers review affected campaigns, Google has made a Bid Target Adjustment Tool available within Google Ads.

Eligible advertisers may see a notification asking them to review campaign targets.

The tool can also be accessed through relevant campaign bidding settings as Google's deployment continues.

If the tool isn't visible in your account yet, Google's FAQ says availability is continuing to roll out.

Should You Change Your Target ROAS or CPA Immediately?

Not simply because this update exists.

The first question should be:

Does my existing target accurately represent what I want Google Ads to achieve?

If the answer is yes, leaving the target unchanged may be perfectly reasonable.

If your campaign has substantially outperformed an old target and that historic target no longer reflects your margins or objectives, it deserves review.

Avoid blindly copying Google's recommendation, an agency benchmark or somebody else's ROAS target.

A suitable target for one ecommerce store can be completely unsuitable for another.

This Update Shows Why Google Ads Inputs Matter More Than Ever

Google Ads continues to move towards increasingly automated and AI-led campaign management.

That doesn't remove the need for human decision-making.

It changes where that decision-making matters.

If Google is increasingly responsible for deciding:

• Which auction to enter
• How much to bid
• Which product to show
• Which channel receives spend
• Which customer is most likely to convert

then the inputs supplied to Google's systems become increasingly important.

Those inputs include:

• Conversion data
• Conversion values
• ROAS and CPA targets
• Budgets
• Product feed data
• Website information
• Merchant Center settings

Automation can optimise very effectively towards the wrong objective if the objective itself is wrong.

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Suspended or Unsure Whether Your Store Is Google-Ready?

If your issue goes beyond bidding performance and you're dealing with a Google Merchant Center suspension, repeated review failures, feed problems or uncertainty around your Shopify store's compliance, Pulserig can review the store before you make further changes.

Our free audit looks at areas including:

• Account and suspension status
• Policy and compliance issues
• Product feed problems
• Website trust signals
• Shipping and returns consistency
• Technical and structured-data issues
• Areas that should be addressed before another review

Request your free Google Merchant Center & Shopify compliance audit.

The important thing is to establish whether you're dealing with a Google Ads optimisation problem, Merchant Center problem, website compliance problem or a combination of them before wasting more advertising spend or another account review.

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Frequently Asked Questions

What changed in Google Ads on 17 August 2026?

Google began rolling out changes to target-based bidding for campaigns that are Limited by budget. Affected campaigns will optimise more consistently towards the Target CPA or Target ROAS that the advertiser has actually configured.

Does the August 2026 Google Ads update affect Performance Max?

Yes. Google lists Performance Max among the affected campaign types when a campaign is budget constrained and uses an eligible target-based bidding strategy such as Target ROAS or Target CPA.

Will Google automatically increase my advertising budget?

No. Google states that the update does not automatically change advertisers' daily budgets or campaign bidding targets. Existing budget limits continue to apply.

Why has my ROAS changed since 17 August?

There are many possible reasons for a ROAS change. However, if a campaign is Limited by budget and historically performed substantially better than its configured Target ROAS, Google's August bidding update should now be included as one possible factor when investigating the change.

Is the August Google Ads bidding update connected to Merchant Center Misrepresentation suspensions?

No. The bidding-system update is separate from Merchant Center policy enforcement. If Merchant Center is suspended, website, business, feed and policy compliance should be investigated separately.

Should I increase my budget when Google says Limited by budget?

Not automatically. First check whether the campaign is profitable, whether the bidding target accurately reflects your commercial objective and whether conversion tracking and Merchant Center data are correct. Increasing a budget without understanding those factors can increase spend without improving profitability.

Information in this article is based on Google's published guidance available in August 2026. Google Ads features and bidding behaviour can change, so advertisers should also check Google's current documentation and their own account data before making major campaign changes.