Consent Mode Is Now the One Switch Between GA4 and Google Ads: What Ecommerce Directors Should Check

If your GA4 property is linked to Google Ads, your cookie banner now has a bigger job than most boards realise. Since 15 June 2026, it is the single switch that decides whether the Google Ads cookies and IDs collected by GA4 can be used in Google Ads. The old back-up switch in GA4, called Google signals, no longer does that job.

Google has also said two more changes are coming "later in 2026": one for how GA4 data is used for ads personalisation (such as remarketing), and one for IP addresses. The exact dates haven't been published yet, and the end of 2026 is now close. In this blog, we'll explain what changed in plain English, why it matters for the P&L, and what to check before your peak trading weeks.

What changed (in plain English)

Google's Analytics help page puts it like this:

"To simplify controls, while ensuring data collection remains aligned with users choice, starting June 15, 2026, Google Analytics will transition to using Consent Mode (within Google Ads) as the single control for data. This means your users’ privacy selections, managed via Ads Consent Mode settings, will exclusively govern how data is collected and used."

Source: Google Analytics Help, Updates to Google Analytics Data Controls.

In plain English:

• Linking GA4 to Google Ads shares data. When the two are linked, data flows from GA4 into Google Ads. That includes Google Ads cookies and IDs that help Google Ads recognise visitors, plus audiences built in GA4.
• Before 15 June 2026, there were two switches. Both the Google signals setting in GA4 and Consent Mode controlled whether those Google Ads cookies and IDs could be used. Some teams turned Google signals off as a privacy safeguard.
• Now there is one switch. Consent Mode, and in particular the ad_storage signal your cookie banner sends, decides it on its own. Google's Consent Mode help page says that if you don't want Google Ads to use these cookies and IDs, you can set the default for ad_storage to "denied".
• Google signals still exists, with a smaller job. It now only controls whether GA4 data is connected to signed-in Google users for reporting inside GA4.
• Next: ads personalisation. Today, whether GA4 data can be used for ads personalisation is controlled by several GA4 settings (account, property, Ads link and event level). Google says that later in 2026, the Consent Mode ad_personalization signal will be the only control once GA4 is linked to Google Ads.
• Next: IP addresses. Google says IP addresses collected automatically by the Google tag will be encrypted and passed to your linked Google Ads account, where Google Ads settings control them.
• Dates still to come. Google's page ends: "More details and the exact dates for changes to ads personalization and IP address controls will be shared later this year."

A reminder of what the four Consent Mode signals mean: ad_storage (ad cookies), analytics_storage (analytics cookies), ad_user_data (sending user data to Google for advertising) and ad_personalization (personalised ads such as remarketing). If you want the detail on what still reaches Google when someone says no, our earlier post on advanced Consent Mode v2 covers it.

Why it matters for the P&L

• Your banner now controls ad performance, not just compliance. Remarketing audiences and the signals Google's bidding learns from depend on these consent choices. If your banner sends the wrong default or never sends the update when a customer clicks "Accept", Google Ads can lose signals and audiences from people who said yes.
• The old safeguard may have gone quiet. If someone turned Google signals off to keep GA4 data away from Google Ads, that setting stopped doing that job on 15 June 2026. If your banner sends "granted" by default, more may be flowing to Google Ads than your privacy team believes. That is a regulatory and reputational risk, not just a technical one.
• Simo Ahava's reading. When Google announced the change in April, the analytics expert wrote on LinkedIn, as reported by Search Engine Roundtable: "If I’m reading this correctly, there’s no middle ground here." In short: ad_storage is the switch, so it needs to be right.
• The next changes could land near peak. Google has said "later in 2026" but has not given dates. If the ads personalisation change arrives in November or December, any banner that doesn't send ad_personalization properly could shrink remarketing audiences when they matter most. Fixing it now is cheaper than fixing it in the middle of Black Friday.
• UK traffic counts too. Google's EU user consent policy covers end users in the European Economic Area, the UK and Switzerland. UK retailers are not outside this.

A worked example

Imagine a UK homeware retailer with GA4 linked to Google Ads and a cookie banner from a well-known consent platform. (An illustrative scenario, not a real client.) Two years ago, its agency turned Google signals off "to keep GA4 data out of Ads", and nobody has looked at it since.

The Head of Digital asks three questions. First, does that old setting still protect anything? Since 15 June 2026, not for Google Ads cookies and IDs. Second, what does the banner actually send? The team opens Tag Assistant in fresh sessions and tests "Accept", "Reject" and changing their mind. They find the banner sets all four signals correctly on "Accept", but sends no default before the tags load. Third, who owns this? The privacy lead and the paid media lead agree a single owner, fix the default, note the date and add a weekly check of remarketing audience sizes against the previous month until Google publishes the next dates.

Director checklist

1. List every GA4 property linked to Google Ads. Note which Google Ads accounts receive data and who owns each link.
2. Ask whether anyone relied on Google signals as a privacy switch. If they did, that protection no longer covers Google Ads cookies and IDs. Consent Mode now does.
3. Test the banner, not the settings page. In fresh browser sessions, test "Accept", "Reject" and withdrawing consent. Use Tag Assistant to check all four signals, and that defaults are set before Google tags send data.
4. Check your defaults by region. Make sure UK, EEA and Swiss visitors get the defaults your legal advice requires, and that the rest of the world is set deliberately, not by accident.
5. Read GA4's own consent check. In GA4, go to Admin, then Data collection and modification, then Consent settings. Select each data stream and review the advertising consent signals section. Google says notifications can take 48 to 72 hours to update after a fix.
6. Get ad_personalization right now. Google says it will soon be the only control for using linked GA4 data for ads personalisation. Make sure your banner sends it correctly before that happens.
7. Brief your privacy lead on IP addresses. Google says encrypted IP addresses will flow to linked Google Ads accounts. Ask whether your privacy notice needs updating.
8. Decide your peak plan. If Google announces dates during your change freeze, agree in advance who checks what, and when.
9. Watch the numbers after any change. Track remarketing audience sizes and Google Ads conversions weekly, and compare them with orders in your own system.

Caveats

• Dates are not confirmed. Google says details and exact dates for the ads personalisation and IP address changes "will be shared later this year". Prepare, but don't rebuild around guesses.
• This is about linked data. The change covers GA4 data used in Google Ads. GA4's own reporting is still governed by analytics_storage and your GA4 settings.
• Consent Mode doesn't make a banner lawful. It only passes the customer's choice to Google's tags. What you must ask for is a legal question under UK and EU rules, and this blog isn't legal advice.
• Basic and advanced Consent Mode behave differently. In basic mode, Google tags are blocked until consent. In advanced mode, tags load and send cookieless pings when consent is denied. Choose deliberately, with your privacy lead.
• Modelled conversions are estimates. Google fills some gaps from people who decline with modelling. Treat those numbers as estimates and check them against your own orders.
• Other ad platforms are separate. Meta, TikTok, LinkedIn and Pinterest have their own consent handling. Google's change doesn't cover them.

Final thoughts

#13/100 — Your cookie banner is now the only switch between GA4 and Google Ads. Make sure it says what you think it says.

This change won't show up as a new button or a new report. It sits quietly in a help page. But it moves real responsibility onto your cookie banner. The work for directors is simple: find out which properties are linked, test what the banner actually sends, get all four signals right before peak, and be ready when Google publishes the next dates.

Not sure what your banner is really telling Google? Run the free GA4 and GTM tracking scan at https://audit.taggurus.co.uk/, email info@taggurus.co.uk, or book a meeting today to discuss.

FAQ

Q: What changed on 15 June 2026?
A: For GA4 properties linked to Google Ads, Consent Mode became the single control for whether the Google Ads cookies and IDs collected by GA4 can be used in Google Ads. The Google signals setting in GA4 no longer controls this.

Q: What does Google signals do now?
A: It only controls whether GA4 data is connected to signed-in Google users for reporting inside GA4.

Q: What is still to come?
A: Google says that later in 2026, the Consent Mode ad_personalization signal will be the only control for using linked GA4 data for ads personalisation, and encrypted IP addresses will flow to linked Google Ads accounts. Exact dates haven't been published yet.

Q: Does this affect UK businesses?
A: Yes. Google's EU user consent policy covers end users in the EEA, the UK and Switzerland, and the June change applies to any GA4 property linked to Google Ads.

Q: Do we need to change anything if we use a Google-certified consent platform?
A: Perhaps not, but don't assume. Test what the banner actually sends in Tag Assistant, and check GA4's Consent settings page for each data stream.

Q: Will fixing this lose us data?
A: It depends on what your banner sends today. If it already respects customers' choices correctly, you shouldn't see a big change. If it doesn't, fixing it is the right thing to do, and you should brief finance before the numbers move.