Conversion tracking tells Google what happens after someone clicks your ad. Without it, you know how many clicks you got but not which ones turned into leads, calls, or sales. If your Google Ads account is optimising without conversion data, it's effectively flying blind — and you're paying for it.
What conversion tracking actually does
When someone clicks your ad and lands on your website, Google drops a cookie. If that person then completes an action you care about — fills out a form, calls your number, purchases something — a snippet of code on that confirmation page fires and sends that event back to Google Ads.
Google uses this data to do two things: show you which campaigns, ad groups, and keywords are actually generating results, and power its automated bidding algorithms (Target CPA, Target ROAS, Maximise Conversions) to find more people like the ones who converted.
Why this matters for Smart Bidding
Google's automated bidding strategies are only as good as the conversion data feeding them. An account with zero or broken conversions running Target CPA is optimising toward nothing — and usually burning budget to prove it.
The three main conversion types for Australian businesses
- •Form submissions: Someone fills out a contact or enquiry form. The conversion fires on the thank-you page (/thank-you, /contact/success etc.). This is the most common setup for service businesses.
- •Phone calls: Tracked either via a Google forwarding number that replaces your on-site number, or via a click-to-call event on mobile. Both methods work; forwarding numbers give richer data.
- •Purchases / transactions: Ecommerce events that fire on the order confirmation page, typically including transaction value. Essential for ROAS-based bidding.
For most Australian service businesses, form submissions and phone calls are the two primary conversion types. Both should be tracked, and they should be tracked separately — so you can see the split.
The most common tracking mistakes
In practice, most Google Ads accounts I audit have at least one of these problems:
- •Tracking the contact page view, not the form submission: The conversion fires when someone visits /contact, not when they actually submit a form. This massively inflates conversion numbers and misdirects bidding.
- •Duplicate conversions: The same action tracked twice — once via Google Tag Manager and once via a hardcoded tag. Every real conversion counts twice, distorting your CPA data.
- •Conversions not marked as "Primary": In Google Ads, only Primary conversions are used in bidding. If your form submission is marked Secondary, Smart Bidding is ignoring it.
- •Phone tracking not set up at all: Calls are often the highest-intent lead type for service businesses, and they're frequently not tracked because setting up a forwarding number takes an extra step.
- •Cross-domain tracking broken: If your ads lead to a third-party booking tool or payment gateway on a different domain, the conversion tracking usually breaks unless configured correctly.
How to verify your tracking is working
Don't trust the status indicator in Google Ads alone. "Tracking" doesn't mean tracking correctly. Here's the quickest verification method:
- •Install the Google Tag Assistant Chrome extension and load your site.
- •Submit a test form on your website.
- •Check Tag Assistant — you should see a conversion event fire. If nothing fires, tracking isn't working.
- •In Google Ads, go to Tools > Conversions and check that the conversion action shows "Recording conversions" and that the last conversion date is recent.
- •Do a test call via your Google forwarding number and verify it registers in the account.
For eCommerce, use Google's Tag Assistant in debug mode and complete a real test purchase to confirm the transaction value is being passed correctly.
Setting up tracking correctly from scratch
The cleanest setup for most Australian businesses uses Google Tag Manager (GTM) to deploy both the Google Ads conversion tag and the Google Analytics tag. GTM gives you one container to manage all tracking, and makes changes without needing a developer every time.
The basic setup for form submission tracking:
- •Create the conversion action in Google Ads (set it as Primary, choose the right category, set conversion window)
- •In GTM, create a Tag using the Google Ads Conversion Tracking template
- •Set the trigger to fire on your thank-you page URL (Page URL contains /thank-you)
- •Publish the GTM container and verify using Tag Assistant
One thing worth getting right from day one
Set the conversion window to match your actual sales cycle. If it typically takes 30 days for a lead to become a sale, a 7-day conversion window will undercount. For most Australian service businesses, 30-90 days is appropriate.
Enhanced conversions: worth setting up in 2026
Enhanced conversions are Google's response to the signal loss caused by cookie restrictions and iOS privacy changes. When a user converts, you send Google hashed first-party data (email address, phone number) alongside the conversion event. Google uses this to match conversions that would otherwise go untracked.
For Australian businesses with a CRM or any form that captures contact details, enhanced conversions are worth setting up. They typically recover 10-20% of conversions that cookie-based tracking misses — and that recovered data improves Smart Bidding performance measurably.
Ready to put this into practice?
Book a free 20-minute strategy call and get tailored recommendations for your business - no obligation, no sales pitch.