Conversion tracking connects your Google Ads spend to the real outcomes it produces: form submissions, phone calls, bookings. Without it, you know what you spent but not what it achieved. For an accounting firm running Google Ads, setting up conversion tracking is the single most important technical task — it takes two to four hours and must be done before your first campaign goes live.

What a conversion is for an accounting firm

A conversion is any action a potential client takes that moves them toward becoming a client. For accounting services, the primary conversions are:

  1. Enquiry form submission — a contact form or booking request submitted on your website
  2. Phone call from the ad — clicking the phone number shown in a call extension
  3. Phone call from the website — calling the number on your landing page after clicking through
  4. Booking confirmation — completing a booking via Calendly or a similar tool

Each of these is tracked differently, but all are measurable within Google Ads.

The technical setup: two connected systems

Google Ads conversion tracking works through two connected systems:

  • Google Analytics 4 (GA4) — measures what happens on your website (form completions, page views, button clicks)
  • Google Ads — imports those events from GA4 as conversions to track against your spend

The connection requires: GA4 installed on your website, GA4 linked to your Google Ads account, conversion events configured in GA4, and those events imported into Google Ads.

Step 1: Install Google Analytics 4

If GA4 is not already on your website, install it via Google Tag Manager (the recommended method) or by adding the GA4 script tag directly to your site's <head>. To confirm GA4 is working: open GA4, go to Reports > Realtime, and visit your website in another browser tab. You should see yourself appear as an active user.

Step 2: Configure a form submission conversion event in GA4

The most important conversion for an accounting firm is an enquiry form submission. The simplest way to track this is by measuring a thank-you page view — the page someone lands on after submitting a form. In GA4, go to Admin > Events. Create a new event that fires when someone views your thank-you page URL. Name it something clear: form_submission_contact or enquiry_received.

If your contact form does not redirect to a thank-you page after submission, you need either a developer to add a redirect, or a more advanced event trigger (button click tracking via Google Tag Manager).

In Google Ads, go to Tools > Linked Accounts > Google Analytics. Link your GA4 property to your Google Ads account. This enables importing GA4 events as Google Ads conversions. Alternatively, in GA4, go to Admin > Google Ads Linking and add your Google Ads account. Once linked, allow 24 hours for the connection to fully propagate.

Step 4: Import GA4 events as Google Ads conversions

In Google Ads, go to Tools > Conversions > Import. Select Google Analytics 4 and choose the events you want to track (your form submission event, booking event, etc.). Set the conversion category (Lead), the conversion value (optional — you can assign an estimated value per enquiry), and the attribution model (Data-driven or Last Click).

Step 5: Set up call tracking

Call extension tracking: in Google Ads, set up a call asset (call extension) with your phone number. Under Tools > Conversions, create a new conversion action with type "Phone calls from ads". Google provides a Google Forwarding Number to replace your number in the call extension — calls are forwarded to your real number and counted as conversions.

Website call tracking: to track calls that happen after someone visits your landing page (not directly from the ad), you need a call tracking tool like CallRail or Google's website call tracking feature in Google Ads. For most small accounting firms, call extension tracking is sufficient. Add website call tracking if phone calls are a primary enquiry channel.

Step 6: Test your conversion tracking

Before launching your campaign, verify that tracking is working:

  1. Submit your contact form and check that the thank-you page triggers the GA4 event (visible in GA4 Realtime under Events)
  2. Check in Google Ads Conversions that the conversion action shows "Recording conversions" status — this takes 24 hours to confirm after a test conversion
  3. For call tracking, make a test call through your Google Ads call extension and check it registers

Do not spend budget until tracking is confirmed as working.

Common setup mistakes

Using the old Universal Analytics: GA4 replaced Universal Analytics in July 2023. If your site still uses a UA tag, GA4 data will not be available for Google Ads import. Install GA4 alongside or replacing UA.

Tracking the contact page view, not the thank-you page: someone visiting your contact form page has not yet submitted it. Track the thank-you page (post-submission) as the conversion, not the contact page visit.

Counting the same conversion multiple times: if you track both a GA4 form event and a direct Google Ads tag on the same page, you may double-count conversions. Use one method consistently.

Not enabling auto-tagging: Google Ads auto-tagging adds a GCLID parameter to your URLs to match clicks with conversions in GA4. Confirm it is enabled in Google Ads Settings > Account Settings > Auto-tagging.

Key takeaways

  • Conversion tracking connects spend to outcomes — without it, Google Ads campaign decisions are based on incomplete data.
  • Primary conversions for accounting firms: form submission (thank-you page view), phone call from ad extension, and phone call from website.
  • The technical setup requires GA4 installed on your website, linked to Google Ads, with conversion events imported.
  • Track the thank-you page view as the form conversion, not the contact form page itself.
  • Test tracking before launching any campaign and verify conversions are recording before increasing budget.

Frequently asked questions

What if our website does not have a thank-you page after form submissions?

Ask your web developer to add a redirect to a thank-you page URL after form submission. Alternatively, configure Google Tag Manager to fire a form_submit event when the submit button is clicked — this does not require a thank-you page but requires more complex tagging. The redirect approach is simpler.

Can we assign a monetary value to each enquiry conversion?

Yes. In Google Ads, when setting up the conversion action, you can assign a fixed value per conversion (for example £100 representing an estimated enquiry value). This enables Return on Ad Spend tracking and revenue-based reporting. It requires an estimate of your average enquiry value or conversion-to-client rate.

How long does it take for conversion data to appear in Google Ads?

Conversions imported from GA4 typically appear in Google Ads within 24 to 72 hours of the conversion occurring. There may be a delay in the reports — if a conversion happened yesterday and does not appear yet, check again tomorrow before troubleshooting.

Should we use Google Tag Manager to install tracking codes?

Yes, for most websites. GTM makes it easier to add and update tracking tags without developer involvement, reduces the number of scripts hardcoded into your site, and provides a testing environment before publishing changes. If your site already has GTM installed, add GA4 and any additional tags through GTM.

What is an attribution model and which should we use?

Attribution models determine how credit for a conversion is assigned across the multiple touchpoints before conversion (first click, last click, etc.). For most accounting firms with relatively simple conversion paths, Last Click or Data-Driven attribution are appropriate starting points. Data-Driven is recommended by Google for accounts with sufficient conversion volume (50 or more per month).