Traffic Acquisition Report in GA4

February 17, 2026
  • First Published: February 17, 2026
  • Last Modified: March 15, 2026

The Traffic Acquisition report is generally the first place I go to answer that question. It helps you separate the vanity metrics from the data that pays the bills.

It tells you which sources are generating sales and leads, and crucially, which ones are driving traffic that simply refuses to convert.

Here is how to get the most out of it.

Table of Contents

Key Takeaways

    • The “Last Click” View: This report focuses on the session (last click), not the first time a user ever saw you.

    • Granularity is Key: Switch your primary dimension to “Session source/medium” immediately for actionable data.

    • Isolate Trends: Use the “Plot rows” feature to hone in on specific channel performance over time.

    • Watch Your Prefixes: Always select dimensions that start with “Session” to avoid broken data.

The importance of the traffic acquisition report

We all want more bang for our buck.

The Traffic Acquisition report helps you understand your top-performing traffic channels so you know where to allocate your resources.

But it’s just as valuable for identifying the losers as it is the winners.

It highlights the traffic that arrives in droves but bounces immediately.

When you see a channel eating up budget without moving the needle on key events (conversions) or revenue, you know it’s time to investigate or cut spend.

So when your boss tells you to go viral on Tik-Tok you can tell them it might be more prudent to focus on Bing.

Traffic vs. User Acquisition: The Big Confusion

Here is the thing that trips up even experienced marketers. I see this all the time when clients ask me why there’s a difference in numbers and reporting.

GA4 offers two very similar-looking reports, but they tell completely different stories.

1. The Traffic Acquisition Report

This is your Session view. If you are familiar with attribution, think of this as a last-click model.

It tells you, “For this specific visit that resulted in a sale, where did they come from?”

2. The User Acquisition Report

This uses the First User prefix. It’s a first-click model. It answers, “How did this person find us for the very first time?”

Why does this matter?

Imagine a user clicks a Facebook ad on Monday (First User) but doesn’t buy. On Friday, they search for your brand on Google and make a purchase (Session). The User Acquisition report credits Facebook; the Traffic Acquisition report credits Organic Search. You need to know which question you are trying to answer.

Acquition Reports ga4

How to Customise the Report

The default view shows you the “Session default channel group.” It’s okay for a high-level overview, but it’s often too broad for tactical decisions. Here is how I set mine up to get real answers.

Switch Your Primary Dimension

Click the dropdown arrow above the first column. Change this to Session source/medium. Now, instead of just seeing “Organic Search,” you can see google / organic versus bing / organic.

Add Context with Secondary Dimensions

Click the blue + icon next to the primary dimension.

Try this: Add “Device category.” You might find that your LinkedIn ads perform brilliantly on desktop but waste money on mobile.

Options for primary and secondary dimsensions

Use “Plot Rows” to Remove the Noise

This is a feature many people miss. If you want to see how a specific channel reacted to a campaign launch or a site menu change, tick the checkbox next to that row and click Plot rows.

This isolates that specific channel on the graph above, clearing away the clutter of other data points. It’s the fastest way to spot a spike or a dip specific to one source. This is nice to see information relating to a single channel. If you’ve used annotations you can then see context to your peaks and troughs in the graph.

You can of couse, customise this report completely and create new custom reports for you to use.

The Metrics That Actually Matter

GA4 gives you a lot of columns. Honestly, you can ignore half of them.

Focus on these:

  • Engagement Rate: Are people actually sticking around?
  • Key Events: (Formerly Conversions) Are they taking action?
  • Session Key Event Rate: The percentage of sessions that convert.
  • Total Revenue: For ecommerce sites, this is your bottom line.

Ignore these:

  • Event Count & Events Per Session: These are often too broad to be useful here. Knowing someone triggered 50 “events” (which could be anything from page scrolls to clicks) doesn’t tell you if they are a valuable lead.

A Critical Warning on “Session” Prefixes

If you decide to build a custom report or add dimensions, you must be careful with your naming conventions.

  • Traffic Acquisition relies on dimensions starting with “Session” (e.g., Session source, Session medium).
  • User Acquisition relies on dimensions starting with “First User”.

Do not use the plain, un-prefixed dimensions like “Source” or “Medium.” These are event-scoped dimensions.

Mixing them with session metrics will give you confusing, often incorrect data.

In Summary

The Traffic Acquisition report is your primary tool for understanding day-to-day performance and immediate ROI. It focuses on the Session (last click), differentiating it from the First User view which tracks initial awareness.

To get the best data, always switch your primary dimension to Session source/medium and filter out the noise using the Plot rows function. Most importantly, ensure you always select dimensions that include the Session prefix to avoid data errors. By focusing on engagement and key events rather than simple traffic volume, you can allocate your budget where it actually generates revenue.

Frequently Asked Questions


How can I see data for just one channel?

You can use the search bar above the table to type in “email” or “google,” or you can use the “Add filter” button at the top of the report to strictly include one specific channel group.

Why don’t the numbers match my other reports?

It likely comes down to the scope. Ensure you aren’t comparing a “First User” report with a “Session” based report. Also, check if you have any filters applied that might be excluding data.

Can I export this for a deeper look?

Absolutely. While the standard report is great, clicking “Explore” at the top right allows you to open the data in an Exploration. This is where you can do more complex analysis, like segment overlap.

Kyle

Author

Hello, I'm Kyle Rushton McGregor!

I’m an experienced GA4 Specialist with a demonstrated history of working with Google Tag Manager and Looker Studio. I’m an international speaker who has trained 1000s of people on all things analytics.

Find out more About me
Scroll to Top