TL;DR
The April 2026 GA4 update changed attribution models, restructured reporting, and broke audience exports for many accounts. If you have not checked since then, your data is likely wrong.
Nearly 40% of GA4 properties have event configuration errors. Most businesses do not know.
GA4 data retention defaults to two months. Set it to 14 months or you lose historical exploration data.
Direct traffic above 20% usually signals a tracking problem, not genuine direct visits.
GA4 must be linked to Google Ads manually. Without it, smart bidding runs on incomplete signals.
These seven checks take less than an hour and can prevent months of bad data.
GA4 is installed on most Sydney business websites. The problem is that installed and accurate are two different things. Nearly 40% of GA4 properties have event configuration errors, and most business owners have no idea. They check their dashboard, see numbers, and assume the data is reliable. Often it is not.
The April 2026 GA4 update made this worse. Google restructured the Advertising section, removed first-click as a selectable attribution model, changed how attribution windows are applied, and introduced stricter requirements for GA4 conversion tracking. Audience exports to Google Ads also broke for accounts using legacy audience parameters. If your setup has not been reviewed since that update, the data feeding your decisions and your ad campaigns may be materially wrong.
These seven checks cover the most common problems we find when auditing GA4 for Sydney businesses. Work through them this quarter, before the data compounds further.
Why this Quarter Specifically
GA4 is not a set-and-forget system. Website changes, GTM tag additions, new campaigns, and platform updates all create opportunities for tracking to quietly break. The April 2026 update was the most disruptive GA4 release since Universal Analytics was retired in 2023. Many accounts are now showing inflated direct traffic, incorrect attribution, and depopulated audience lists — with no obvious error message in the platform.
Running a health check now also gives you clean data for Q3 planning. If you find and fix tracking errors in August, September numbers will be reliable. Fix them in November and you have wasted a quarter of campaign data.
Check 1: Are Your Key Events Marked as Conversions?
WHERE TO LOOK
Admin > Events. Any event with the Conversion toggle switched on is actively sending conversion data to your reports and to linked ad platforms.
In GA4, tracking an event and marking it as a conversion are two separate steps. Many setups track the right things but never mark them as conversions. The result: your Google Ads campaigns are optimising with no real conversion signal, smart bidding is flying blind, and your reports show zero attributed conversions even when leads are coming in.
Check that the following are toggled on and firing correctly:
- Form submission confirmation (the thank-you page view or
form_submitevent, not the form view) - Phone click events, if you use click-to-call on mobile
- Purchase events, if you run an eCommerce store
- Booking confirmations, if relevant to your service model
Tracking a form view as a conversion instead of a form submission is one of the most common and costly mistakes in GA4. It inflates conversion numbers and corrupts smart bidding signals at the same time.
We see the business impact of this constantly. When we picked up Clear Skincare Clinics’ Google Ads, the booking conversions were not being captured at all — fixing the tracking was what unlocked a 665% lift in conversions. Same story with a Sydney physio group running ads with no verified conversion tracking: the spend was fine, the measurement was not.
Cross-check the numbers. If GA4 reports 200 conversions last month but your CRM shows 40 leads, something is wrong. A 10 to 15% variance between systems is normal. Anything beyond that needs investigation.
Check 2: Is Your Data Retention Set to 14 Months?
WHERE TO LOOK
Admin > Data Settings > Data Retention. Set to 14 months. Tick Reset user data on new activity and save.
GA4 defaults to a two-month retention window. This does not affect your standard reports, but it cuts you off from Exploration reports beyond that window. Explorations are where the most useful analysis happens: custom funnels, path analysis, cohort reports. If your retention is set to two months and you want to compare this August to last August, you cannot.
This is a thirty-second fix. It should be done at setup and checked quarterly.
Check 3: Is Direct Traffic Unusually High?
WHERE TO LOOK
Reports > Acquisition > Traffic Acquisition. Check the Direct percentage. Above 20% for a business running paid campaigns warrants investigation.
Direct traffic in GA4 is a catch-all for sessions where the source is unknown. Some direct traffic is legitimate: people typing your URL, bookmarks, offline-to-online journeys. But a high direct percentage is usually a sign that the tracking chain is breaking somewhere.
Common causes include:
- Paid campaigns running without UTM parameters, so clicks arrive without a source attached
- Redirects that strip URL parameters before the page loads
- Landing pages missing the GA4 tag entirely
- Referral-less traffic from AI assistants, which has increased significantly in 2026 as more users arrive via ChatGPT, Perplexity, and Gemini without a standard referrer being passed
Start by auditing UTMs on every active paid campaign. Then use Google Tag Manager’s Preview mode to confirm the GA4 tag is firing on every landing page in your current rotation.
Check 4: Has Your Attribution Model Changed Since April 2026?
WHERE TO LOOK
Admin > Attribution Settings. Check which model is selected and what lookback windows are configured for each conversion type.
Data-driven attribution is now the default in GA4 and Google Ads. It requires a minimum of 400 conversions per key event and 20,000 total events over a rolling 30-day period. If your account does not meet that threshold, GA4 falls back to last-click — but this fallback is not prominently displayed anywhere. You may think you are running data-driven and actually be on last-click.
The April 2026 update also removed first-click as a selectable model. If your account was using first-click attribution, it was automatically migrated. The direction of that migration affects which channels appear to be driving conversions and where your budget allocation decisions are pointing.
Check your attribution model, confirm the lookback window matches your actual sales cycle, and review whether the conversions reported since April align with what you saw before the update. If numbers shifted meaningfully in May or June without a corresponding change in campaigns, the update is the likely cause.
This is also where flattering metrics start hiding flat revenue — a dashboard trending up while the bank account does not is almost always an attribution or tracking story.
Check 5: Is Internal Traffic Filtered Out?
WHERE TO LOOK
Admin > Data Streams > Web stream > Configure Tag Settings > Define Internal Traffic. Add your office IP address or range.
Every session your team generates on your own website is being counted in your data. For most Sydney businesses, that means developers, account managers, and business owners browsing their own site are being mixed in with genuine customer traffic. The result is inflated session counts, distorted bounce rates, and conversion events firing on internal test form submissions.
If your office uses a static IP address, the fix is simple: add it to the internal traffic filter and GA4 will exclude those sessions from reports. If the IP is dynamic, filter by hostname instead, or set up a cookie-based exclusion through GTM.
Note: internal traffic skew is also one of the reasons bounce rate figures get misread — clean the data before you act on it.
Check 6: Is GA4 Linked to Google Ads?
WHERE TO LOOK
Admin > Product Links > Google Ads. Confirm the link exists and that auto-tagging is enabled in Google Ads under Account Settings.
GA4 and Google Ads are separate products. The link must be created manually, and it breaks more often than most people realise: account migrations, new property setups, and permission changes can all quietly disconnect it.
Without the link:
- Smart bidding in Google Ads cannot access GA4 conversion data, and falls back to whatever conversion data exists in the Ads account directly
- Audience lists built in GA4 (remarketing segments, engaged users, past converters) cannot be pushed to Google Ads campaigns
- The Advertising section in GA4 shows incomplete attribution data
- Google Ads reports in GA4 show as unlinked
While you are here, check that auto-tagging is enabled in Google Ads. Auto-tagging appends the GCLID parameter to ad URLs, which is what GA4 uses to correctly attribute paid click sessions. Without it, paid traffic falls into direct or organic buckets.
Check 7: Are Your Audiences Still Populating Correctly?
WHERE TO LOOK
Admin > Audiences. Review each audience for size and last-updated date. Cross-check in Google Ads under Audience Manager to confirm lists are receiving data.
The April 2026 GA4 update changed how audience definitions are validated before export to Google Ads. Audiences using certain legacy parameters, deprecated custom dimensions, or event-scoped attributes that no longer meet the new validation rules stopped populating. These audiences show as active in GA4 but are delivering zero users to Google Ads.
This is particularly important for remarketing campaigns. If your retargeting spend has been running against an empty audience list since April, every impression has been wasted. Pull the audience size in Google Ads directly and compare it against what GA4 reports. Our wasted ad spend scorecard is a quick way to put a dollar figure on the damage.
If audiences have stopped growing, rebuild them from scratch using current event parameters. Legacy audience definitions created during the Universal Analytics to GA4 migration period are the most likely to have been affected.
What to Prioritise If You Find Problems
Not every issue carries the same weight. Here is a practical order of priority for Sydney businesses running paid campaigns:
- Conversion tracking errors first. These directly degrade smart bidding performance in Google Ads and corrupt every attribution report you have. Fix before anything else.
- Google Ads link second. A broken link compounds the conversion tracking problem and cuts off your remarketing capability entirely.
- Audience list health third, especially if you run retargeting. Rebuilt audiences take time to repopulate, so fixing this has a lag effect on campaigns.
- Data retention and internal traffic filter after that. These are not urgent but affect the long-term quality of your data and your ability to do meaningful analysis.
- Direct traffic investigation last. Important, but diagnosing tracking chain gaps is a process that takes time and should not hold up the higher-priority fixes.
If you want to take this further on the ads side, our Google Ads audit checklist covers the account-level issues that sit alongside these tracking problems — and what we learned auditing 100 Google Ads accounts explains why broken measurement is almost always the first thing we find.
If you find multiple problems and do not have the technical resource to fix them, our GA4 and GTM analytics consulting team can audit your setup and fix it in a single session. We work with Sydney businesses across all industries, and this is something we do every week. Get in touch and we will take a look.
FAQs
How do I check if my GA4 conversions are set up correctly?
Go to Admin, then Events. Any event with the toggle switched to Conversion is actively sending conversion data. Cross-check by going to Reports, then Advertising, then Conversions, to see whether the numbers match what you expect from your CRM or booking system. If a key action like form submission or phone click is missing, it needs to be added and marked as a conversion.
Why is so much of my traffic showing as Direct in GA4?
Direct traffic in GA4 increases when the tracking chain breaks. The most common causes are paid campaigns running without UTM parameters, redirects that strip URL parameters, landing pages missing the GA4 tag, and referral-less traffic from AI assistants. Start by auditing UTMs on your active campaigns and confirm that every landing page has the GA4 tag firing in Google Tag Manager’s Preview mode.
What changed in the April 2026 GA4 update?
Google restructured GA4’s Advertising section, changed how attribution models are displayed, removed first-click as a selectable model, and tightened requirements for data-driven attribution. Audience exports to Google Ads were also affected, with some legacy audience definitions stopping population. If you have not audited your setup since April 2026, conversion numbers, attribution data, and audience lists may be reporting incorrectly.
How long should I set GA4 data retention?
Set it to 14 months. The default is two months, which means you lose access to Exploration reports beyond that window. Go to Admin, then Data Settings, then Data Retention, set to 14 months, tick Reset user data on new activity, and save. This does not affect your standard aggregate reports, but it is critical for year-on-year analysis in the Explore section.
How do I filter out my own office traffic from GA4?
Go to Admin, then Data Streams, then your web stream, then Configure Tag Settings, then Define Internal Traffic, and add your office IP address or range. If your office uses a dynamic IP, consider filtering by hostname or setting up a developer traffic exclusion via GTM instead. Mark the filter as active once set up, or sessions will continue to be counted.
Does GA4 need to be linked to Google Ads separately?
Yes. GA4 and Google Ads are separate products and the link must be set up manually. Without it, smart bidding in Google Ads cannot access GA4 conversion data, audience lists from GA4 cannot be used in Google Ads campaigns, and the Advertising section in GA4 shows incomplete data. Go to Admin, then Product Links, then Google Ads, and link your account. Also confirm auto-tagging is enabled in Google Ads under Account Settings.
How often should a Sydney business audit its GA4 setup?
At minimum, once per quarter. GA4 is not a set-and-forget system. Platform updates, website changes, GTM tag additions, and new campaigns all create opportunities for tracking to break silently. A quarterly check catches problems before they affect months of data and ad spend. For businesses running significant paid budgets, a monthly review of conversion and attribution data is worth the time — or bring in GA4 and GTM specialists to handle it.
What is the difference between an event and a conversion in GA4?
Every action tracked in GA4 is an event. Not every event is a conversion. An event becomes a conversion when you toggle it on in the Events section of Admin. Only marked conversions are used by Google Ads for smart bidding, appear in conversion reports, and count toward your cost per conversion figures. Tracking form views as a conversion instead of form submissions is one of the most common and costly mistakes in GA4 setups we review.
Run the Checks. Then Get a Second Set of Eyes On It.
Work through these seven checks this week. Most of them take minutes, and even finding one broken thing pays for the hour. But GA4 hides its problems well — a setup can pass every check above and still be feeding Google Ads the wrong signal, because the tag fires twice, or the thank-you page is counted as a purchase, or a GTM trigger someone added in 2024 is still quietly double-counting leads.
That is the part we are good at. We have been fixing analytics for Sydney businesses since 2008, and broken measurement is the single most common thing we find when a new client hands us their account — usually after months of decisions made on numbers that were never right. Our GA4 and GTM analytics consulting team can audit your property, fix what is broken, and show you exactly what changed and why.
No lock-in contracts. No jargon. Just a setup you can trust. Talk to us and we will take a look at your GA4 before you spend another dollar on ads.
