Do you use Google Analytics, Google Ads, or remarketing on your website and rely on campaign data? From June 15, 2026, Google is changing the way advertising data is collected and used when GA4 and Google Ads are linked.

In this article, we’ll explain what this change means for a non-technical website owner or marketing manager, and how to check whether your analytics, cookie banner, and ad measurement are working correctly.

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What’s Changing from June 15, 2026

Google states that, from June 15, 2026, data controls for linked Google Analytics and Google Ads accounts will be simplified. Data used in Google Ads will primarily be governed by Consent Mode settings in Google Ads, while Google Analytics settings will control data used mainly for reporting user behavior in GA4.

Until now, when GA4 and Google Ads were linked, some aspects of data collection were also controlled through the Google Signals setting in GA4. From June 15, 2026, the collection and use of data for Google Ads will be determined primarily by Consent Mode in Google Ads. Google Signals will remain mainly a setting for reporting in GA4.

For website or e-commerce owners, this means one simple thing: it is not enough to have a cookie banner on the website just for show. The website must correctly pass the user’s consent or refusal to Google’s tools. If this signal is not sent correctly, it can affect conversion measurement, remarketing audiences, and the quality of data used in advertising campaigns.

What Is Consent Mode?

Consent Mode is a mechanism that allows a website to communicate to Google’s tools whether a user has consented to analytics or advertising cookies. It is not the cookie banner itself. Consent Mode simply receives the user’s choice from the cookie banner or CMP (consent management platform) solution and adjusts the behavior of Google tags accordingly.

In this article, we will not go into the full implementation of Consent Mode in detail again. If you need to understand the difference between a cookie banner, Consent Mode, and Consent Mode v2, we recommend first reading our article on the relationship between cookies, analytics, and marketing, where we cover these topics in more detail.

Who Is Affected by This Change?

This change is particularly important for websites and e-commerce stores that use Google Analytics 4 (GA4) together with Google Ads. Typical use cases include measuring purchases, submitted forms, registrations, leads, or other conversions and then using this data in advertising campaigns.

The change is especially relevant for websites that use remarketing, GA4 audiences, enhanced conversions, or a GA4–Google Ads integration. Google states that consent transmission requirements also apply when Google Analytics data is used in Google Ads, Search Ads 360, or Display & Video 360.

If you use GA4 only for basic traffic measurement and do not use any advertising features, the change taking effect on June 15, 2026 may not be as urgent for you. However, cookies, analytics, and consent settings should still be configured correctly based on the tools you actually use on your website.

What Does This Change Mean in Practice?

If you already have Consent Mode implemented correctly, this change may not require any major changes to your website. You do not automatically need to replace your cookie banner or rebuild your entire analytics setup.

However, you should verify that Consent Mode is actually working correctly. Many websites have only a cookie banner without a proper underlying configuration. And even when Consent Mode was originally set up correctly, changes to the website, cookie banner, or Google Tag Manager are often made without anyone checking whether consent signals are still being passed to GTM properly.

Risks of Incorrect Implementation

If Consent Mode is not working correctly, Google Ads may not receive the right information for conversion measurement, ad personalization, or remarketing. This can affect the quality of the data you use to evaluate campaign performance.

Another problem is a false sense of confidence. A website may have a cookie banner, GA4, and Google Ads in place, while consent information is not actually being passed between them correctly. Everything may appear to be properly configured on the surface, but the underlying data may not be reliable.

Quick Configuration Check

First, check whether GA4 and Google Ads are linked and whether your advertising account uses data from Google Analytics. If so, this change is relevant to you.

Next, check whether GA4 and Google Ads correctly respect the user’s cookie preferences, particularly for advertising cookies and personalization. It is important that your analytics setup behaves according to the choices the user makes in the cookie banner.

Finally, review your main conversions: purchases, form submissions, leads, registrations, or any other actions you use to evaluate marketing performance. After fixing your measurement setup, it is important to distinguish between changes in actual business results and changes caused only by the way analytics captures those results.

When Does a Professional Audit Make Sense?

If you have a simple website without advertising, the check may be relatively quick. However, if you run an e-commerce store, performance campaigns, remarketing, or multiple marketing tools, an incorrectly configured Consent Mode setup can affect both budget decisions and campaign evaluation.

A professional audit is particularly useful when you cannot determine whether the problem lies in the cookie banner, Google Tag Manager, GA4, Google Ads, or the conversion tracking itself. All of these components need to work together as a single ecosystem.

Conclusion

The change taking effect on June 15, 2026 is no reason to panic. Instead, it is a good opportunity to check whether your analytics and marketing campaigns are working together as one system while respecting users’ preferences.

If you use GA4 and Google Ads, verify that Consent Mode is correctly passing consent signals and that your conversion measurement is reliable.

If you are not confident checking this yourself, we will be happy to help. We can review your measurement setup, Consent Mode, GA4, Google Ads, and conversion tracking, and recommend fixes wherever the data stops making sense.

Contact us for a no-obligation consultation.

Frequently Asked Questions

Possibly. If Consent Mode is configured correctly, the change may not require any major intervention. The problem is that many websites have Consent Mode enabled only formally, without anyone verifying whether consent signals are actually being sent correctly to GA4 and Google Ads.

So the real question is not “Do we have Consent Mode?” but rather “Is Consent Mode working correctly for our conversions and advertising?”

This change is particularly relevant if you use Google Analytics 4 together with Google Ads. It is even more important if you import conversions from GA4 into Google Ads, use remarketing, or use Analytics audiences.

If you have only a simple website without advertising and without a GA4–Google Ads integration, this is probably not an urgent issue. However, it still makes sense to have your analytics and consent setup configured correctly.

Some numbers may change. However, this does not necessarily mean that your website or campaign performance has worsened. In many cases, it simply means that measurement has started reflecting users’ consent choices more accurately.

The important thing is to distinguish between a genuine change in performance and a correction to previously inaccurate measurement. This is why it is useful to review your analytics both before and after making changes.

Yes. If conversions were previously measured incorrectly, the numbers may change in the short term after the setup is corrected. This does not necessarily mean the fix caused a problem. It may simply mean that Google Ads is now working with different or more accurate input data.

For this reason, you should not evaluate the fix solely based on whether the number of conversions immediately increases or decreases. What matters more is whether conversions are being measured consistently and in accordance with the applicable consent settings.

Partly, yes. Without extensive technical expertise, you can check whether GA4 and Google Ads are linked, whether you are importing conversions, and whether your accounts display any Consent Mode warnings.

However, we recommend leaving the technical review of tags, consent signals, and cookie banner behavior to someone who understands Google Tag Manager, GA4, and Google Ads. Otherwise, it is easy to overlook an issue.

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