Set Up GTM Event to Track Form Drop-Offs: Instant Guide

Step 1: Enable Variables

• In GTM, enable relevant built-in variables:

  • Form ID

  • Form Classes

  • Form Element

  • Page URL

Step 2: Create a Form Interaction Trigger

• Navigate to Triggers → New → Trigger Configuration

• Select Form Submission

• Check “Wait for Tags” and set Check Validation.

• Define trigger filters like:

  • Form ID contains “leadForm”

  • Page URL contains “/signup/”

Step 3: Add a Drop-Off Tracking Trigger

• Instead of tracking only final submission, track field interactions.

• Use Element Visibility Trigger or Click Trigger for input fields.

• Capture last-interacted field values (indicating where abandonment happened).

Step 4: Create a Custom Event Tag

• Go to Tags → New → Tag Configuration

• Select GA4 Event Tag (or Universal Analytics if legacy).

• Event name: form_drop_off

• Parameters:

  • form_id → {{Form ID}}

  • last_field → {{Click Element}}

Step 5: Link Tag and Trigger

• Assign the newly created form drop-off trigger to the event tag.

Step 6: Test in Preview Mode

• Use GTM Preview to simulate form interactions.

• Ensure the event fires when a user abandons the form but not on final submission.

Step 7: Publish and Validate in GA4

• Publish the container.

• In GA4, check Events → form_drop_off for real-time tracking.