GA4 Setup and Migration: An Australian Marketer's Guide

Universal Analytics is gone, and I still meet business owners running on broken or half-configured GA4 setups. The scary part is that many of them do not know their reports have been quietly wrong for months. They look at a dashboard, see numbers, and assume the numbers mean something. In analytics, a confidently wrong number is worse than no number at all.

This post is the straightforward migration guide I give clients: what changed, why event based data matters, what needs to be set up properly from day one, and the common Australian implementation mistakes that wreck the data. It is written for business owners and marketers who want to hand their developer a sensible checklist, or sanity check the setup they already have.

Why GA4 Replaced Universal Analytics

If you have been in digital marketing for a while, the switch to GA4 can feel like a downgrade, because the familiar reports disappeared. Understanding why it happened makes the new platform easier to work with.

The sunset timeline in plain English

Google retired the old platform for good. According to Google Analytics Help, "Starting July 1, 2023, standard Universal Analytics properties stopped processing data. You'll be able to see your Universal Analytics reports for a period of time after July 1, 2023. However, new data will only flow into Google Analytics properties." The 360 tier lasted a little longer, with the same page noting that "360 Universal Analytics properties will receive a one-time processing extension ending on July 1, 2024." Google Ads Help confirms the same timeline: "Google Analytics 4 has replaced Universal Analytics. Starting on July 1, 2023, all standard Universal Analytics properties stopped processing data." There is no migration still to do in the sense of keeping the old platform alive. The only real migration left is making sure your GA4 property is correct.

What event based data means for you

Universal Analytics was session based: it grouped activity into visits and measured pageviews within them. GA4 is event based: almost every meaningful interaction is recorded as an event, from a page view to a scroll to a form submission. That is more flexible, because you can measure what matters to your business rather than what the old report structure allowed. The trade-off is that you now have to define what matters, which is where most setups go wrong.

What GA4 Setup Actually Involves

A correct GA4 setup is not one task. It is a small chain of tasks, and each link has to hold.

Property, data stream and tag

You need a GA4 property, a data stream for your website (and separate streams for apps if you have them), and the tag installed on every page. The measurement ID connects the stream to the tag. If the tag is missing on key pages, or duplicated on every page, your data is wrong from the start.

Events and key events

GA4 automatically collects some events, but the events that matter to your business need explicit setup. A form submission, a phone call click, a booking, a download: each one should fire as an event you have defined and tested. You then mark the ones that matter as key events, which is how GA4 knows what a conversion is for your business.

Conversions that match your business

This is the step most Australian sites get wrong. They mark whatever came with the default setup as a conversion, or they never mark anything, so the reports show no conversions at all. Your conversions should match how your business actually gets enquiries: a contact form submission for a service business, a purchase event for ecommerce, a booked consultation for a professional firm.

GA4 Migration Mistakes Australian Sites Make

When I review setups that migrated from Universal Analytics, the same problems appear. Most of them are not technical mysteries. They are misunderstandings about how GA4 works.

Copying old UA thinking

People try to recreate Universal Analytics reports inside GA4 and get frustrated when the numbers do not match. GA4 counts events, not sessions, and uses different default reporting and modelling. Lower or different numbers do not automatically mean something is broken, but you should verify configuration before trusting the change. The platform is different on purpose, so compare apples with apples and define your own reports around the questions you need answered.

Missing key events and parameters

Parameters are the detail attached to an event, such as which form was submitted or which product was viewed. Without parameters you get events without context, and without key events you get no conversions. Both need to be defined, tested and verified in the real property, not just in a test environment.

Not checking data quality

The most common failure I see is a setup that was installed once and never checked. Tags fire twice on some pages, the developer forgot the thank you page, the measurement ID is the wrong one, or the site was rebuilt and the tag was dropped entirely. Data quality needs an actual check: load key pages, confirm events fire, confirm the data arrives in the property, and repeat after any site change.

How to Set Up GA4 Properly

If you are starting fresh or fixing a broken property, work through a checklist rather than trusting the default setup.

A step by step setup checklist

• Create a GA4 property for the business and confirm no duplicate properties are collecting the same site.
• Add a data stream for your website and install the tag on every page, including thank you and confirmation pages.
• Define the events that matter: form submissions, call clicks, bookings, purchases.
• Add parameters so each event carries useful context.
• Mark your conversion events as key events.
• Exclude your own internal traffic and any developer traffic so you are not counting yourself.
• Test the full journey: load the site, submit a test form, confirm the event arrives in the property.
• Check data after 24 to 48 hours and again after any site change.

Linking Google Ads and Search Console

Link your GA4 property to Google Ads so you can see which campaigns produce enquiries, not just clicks. Link Search Console so organic search data appears inside GA4. Both links take minutes and both are commonly missed, which leaves you blind to the two channels most Australian businesses depend on.

GA4 Reporting Basics You Should Know

Once the setup is right, the reports start making sense. Google Analytics is the tool most of the web runs on, and that scale is exactly why getting the modern version right matters. According to W3Techs usage statistics, "Google Analytics is used by 83.2% of all the websites whose traffic analysis tool we know. This is 47.6% of all websites." Here is the minimum you need to navigate GA4 with confidence.

Reports, explorations and comparisons

The standard reports give you the everyday view: traffic acquisition, user acquisition, engagement, and the key events report. Explorations are the flexible canvas where you build the reports that answer your specific questions, such as which pages lead to form submissions. Comparisons let you slice data by channel, campaign or audience without building a new report from scratch.

Understanding your key event data

Treat the key events report as your scoreboard. It shows how many times the events you marked as conversions actually fired, and you can break that down by channel and campaign. If you cannot see your key events in that report, your conversion setup is incomplete, regardless of what the traffic reports say. This is where analytics stops being a vanity dashboard and starts being the thing that feeds your ROI analysis.

Privacy, Consent and Australian Requirements

Analytics sits inside a bigger conversation about privacy, and Australian businesses cannot ignore it.

What the rules mean for tracking

GA4 includes privacy controls such as consent mode and cookieless measurement, which change how data is collected when users do not consent to cookies. Australian businesses still need to handle consent and disclosure in line with their own obligations and legal advice. The practical point for your analytics: if you enable consent mode, you need to configure it properly or you will undercount traffic and conversions, and you need to know that is happening and why.

When to Get Help With GA4 Setup

A basic setup is doable, but a reliable one usually needs someone who has done it many times. Knowing when to bring in help saves months of bad data.

Signs your setup is broken

Your key events report is empty. Your traffic numbers look obviously wrong. Your form submissions never appear as conversions. You rebuilt or changed your site and never checked the tag. You cannot explain why two dashboards disagree. Any of these means the setup needs a review, not another month of collecting unreliable data.

What a migration review covers

A proper GA4 migration review checks the property, data stream, key events, parameters, integrations and data quality, and hands you a fix list. It is the difference between guessing and knowing. Ongoing Google Analytics consulting then keeps the setup honest as your site and campaigns change, and the whole point is to feed decisions: ROI analysis only works when the underlying data is trustworthy. Keep the measurement and tracking side technically sound by working from a technical SEO checklist whenever you touch the site.

Frequently Asked Questions

Do I still have time to migrate from Universal Analytics?

Standard Universal Analytics stopped processing data on July 1, 2023, and 360 properties followed on July 1, 2024. If you are still relying on old UA exports, you are working with historical data only. The fix is a complete GA4 setup now.

What is the difference between events in GA4 and goals in Universal Analytics?

GA4 is event based: almost every interaction can be an event, and you mark the ones that matter as key events. Universal Analytics goals were session based. You need to redefine what a conversion means in your business inside GA4.

Do I need a developer to set up GA4?

Basic page view setup can be done through a CMS plugin or tag manager, but reliable key events, parameters, cross domain tracking and data quality checks usually need someone who knows the platform. A broken setup quietly produces misleading reports.

Why does my GA4 data look different from my old Universal Analytics reports?

GA4 counts events, not sessions, and uses different default reporting and modelling. Lower or different numbers do not automatically mean something is broken, but you should verify configuration before trusting the change.

Is GA4 compliant with Australian privacy requirements?

GA4 includes privacy controls such as consent mode and cookieless measurement. Australian businesses still need to handle consent and disclosure in line with their own obligations and legal advice.

Can you check whether my current GA4 setup is correct?

Yes. A GA4 migration or setup review checks the property, data stream, key events, parameters, integrations and data quality, and gives you a fix list.