--- title: "Conversion Tracking Explained: Common Mistakes" description: What conversion tracking actually is, plus the real-world mistakes — double-counting, wrong primary goals, missing calls — that wreck Smart Bidding. url: "https://steviemorris.com/analytics/conversion-tracking-explained-common-mistakes/" canonical: "https://steviemorris.com/analytics/conversion-tracking-explained-common-mistakes/" type: article silo: na category: analytics location: primary_keyword: conversion tracking explained keywords: - conversion tracking - google ads conversion tracking mistakes - primary vs secondary conversions - offline conversion tracking blueprint: 0 audience: UK business owners date_published: 2026-07-14 date_modified: 2026-07-14 author: Stevie Morris schema_types: - Article - FAQPage - BreadcrumbList record_id: article__conversion-tracking-explained-common-mistakes word_count: 1635 --- # What Is Conversion Tracking and Why Most Accounts Get It Wrong Conversion tracking is the tagging that tells Google Ads which clicks turned into a sale, lead or call, so it can optimise towards them. Most accounts get it wrong through double-counting, treating minor actions as the main goal, missing phone/offline conversions, or running broken tags nobody checks. ## What conversion tracking actually is Conversion tracking is a small piece of code — a tag — that fires when someone completes an action you care about: submits a form, buys something, calls you, or starts a chat. That tag reports back to Google Ads as a "conversion action," and Google Ads uses those conversion actions as the entire basis for automated bidding. No tag, no signal. Broken tag, wrong signal. It's the least glamorous part of a Google Ads setup and, in my experience, the part that decides whether everything else in the account actually works. Inside Google Ads, you don't just have "conversion tracking" as one blob — you have individual conversion actions (form submit, phone call, purchase, newsletter signup), and each one is marked as either **primary** or **secondary**. Primary conversions are the ones Smart Bidding actively optimises towards and the ones that show in your headline conversion columns. Secondary conversions are tracked for visibility but don't drive bidding decisions. That distinction — which actions are primary — is where most of the damage in real accounts starts. ## The building blocks, in plain English - **The Google tag** — the base tracking code (Google's unified successor to the old Google Ads tag / gtag.js) that identifies a visitor as having come from a Google Ads click. - **Conversion actions** — the specific things you're tracking (form fill, purchase, call, sign-up), each configured separately with its own value and counting settings. - **Primary vs secondary** — primary actions feed Smart Bidding and appear in your main reporting; secondary actions are recorded but sit in the background. - **Google Tag Manager (GTM)** — a container that manages multiple tags (Google Ads, GA4, others) without editing site code directly for every change. - **Enhanced conversions / [offline conversion imports](/ppc-paid-ads/unlocking-the-power-of-offline-conversions-for-your-google-ads-strategy/)** — methods for sending Google Ads conversion data it wouldn't otherwise see, like a phone call that closed three days later or a lead that turned into an actual paying customer in your CRM. ## Mistake one: double-counting This is the most common issue I see when I open an account for the first time. A conversion action fires more than once for the same action — usually because a confirmation page reloads on refresh, a tag is duplicated across GTM and native Google Ads tracking, or a single form submit triggers both a GTM event and a separate hard-coded conversion tag. The account then reports, say, 40 leads for the month when the real number is closer to 25. The cost isn't just a vanity metric being wrong. Cost-per-conversion looks artificially good, conversion rate looks artificially good, and — critically — Smart Bidding thinks it's finding more successful outcomes than it actually is, so it keeps pushing budget and bids towards whatever traffic is generating the inflated number. ## Mistake two: treating micro-conversions as the main goal A micro-conversion is a soft signal of interest — a newsletter sign-up, a PDF download, a click on "call us" (not an actual call), scrolling 75% down a page. These are useful as secondary conversions to understand engagement. They're a serious problem when they're set as **primary**, because Smart Bidding will then optimise your entire budget towards getting more of that soft action, not towards the leads or sales you actually need. I've seen this happen most often with the default "Page view" or "Contact" conversion actions Google Ads sometimes suggests during setup — they get accepted as primary because they're easy to track, and the bidding algorithm spends weeks chasing people who click a contact link but never actually get in touch. ### The downstream damage > Smart Bidding strategies (Target CPA, Target ROAS, Maximise Conversions) don't know the difference between a good conversion signal and a junk one — they optimise mathematically to whatever you've told them is primary. Feed it double-counted leads, form-fill clicks that never became customers, or a conversion action with no offline follow-through, and the algorithm will confidently, efficiently spend your budget [chasing the wrong outcome](/data/the-rat-farm-effect-why-chasing-wrong-metrics-kills-ppc-profit/). The bidding isn't broken. The signal it's being fed is. ## Other mistakes worth checking for - **No phone call tracking** — for a huge number of lead-gen businesses, the phone is where deals actually happen, yet the ad account only sees form fills, so Smart Bidding never learns that certain keywords or campaigns are driving your best calls. - **No offline conversion import** — a form fill or call gets tracked, but what happens next (did it become a paying customer, and for how much) never makes it back into Google Ads, so the algorithm optimises for lead volume instead of lead quality. - **Broken tags nobody noticed** — a site redesign, a cookie consent banner change, or a plugin update quietly stops a tag firing, and conversions drop to zero (or silently keep reporting old cached numbers) for weeks before anyone checks the tag itself rather than just the dashboard. - **Cross-domain or subdomain gaps** — checkout or booking happening on a different domain (a payment processor, a booking platform) breaks the click-to-conversion chain unless it's explicitly linked up. ## What good conversion tracking looks like In a well-set-up account, the primary conversion actions map to genuinely valuable outcomes — a qualified lead, a completed sale, a booked call — each counted once, with phone calls and offline outcomes fed back in wherever the business actually closes deals off-platform. Everything else (downloads, sign-ups, engaged sessions) sits as secondary: visible, useful for diagnosis, but not steering the budget. This is part of why [conversion tracking and analytics setup](/ppc-management/) is one of the services I offer directly, rather than treating it as a one-off task at the start of a campaign — it needs checking periodically, not just building once and forgetting about it. ### Related services - [Get a PPC audit](/ppc-audits/) - [Talk to a PPC consultant](/ppc-consultant/) - [PPC management](/ppc-agency/) ### Related reading - [What Is Attribution in Google Ads (and Why Last-Click Is Lying to You)](/analytics/attribution-in-google-ads-explained-2/) - [GA4 Explained: What Changed From Universal Analytics and Why It Matters](/analytics/ga4-explained-what-changed-2/) - [Twelve Signs Your Google Ads Account Needs an Audit](/analytics/signs-your-google-ads-account-needs-an-audit-2/) - [When Should You Fire Your PPC Agency? Red Flags to Watch For](/ppc-paid-ads/signs-you-should-fire-your-ppc-agency-2/) ## Frequently asked questions ### How do I know if my conversion tracking is double-counting? Compare the conversion count in Google Ads against a source you trust — actual form submissions in your CRM or inbox, or GA4 events for the same period. If Google Ads is reporting noticeably more than the real number, check whether the same action is firing more than one tag, and whether a confirmation/thank-you page could be reloading or being revisited. ### What's the difference between a primary and secondary conversion action? Primary conversion actions are the ones Smart Bidding actively optimises towards and the ones counted in your main 'Conversions' column. Secondary conversion actions are still tracked and visible in reporting, but they don't influence bidding. Micro-conversions (downloads, sign-ups, engagement events) generally belong as secondary, not primary. ### Why does phone call tracking matter for Smart Bidding? If calls are how a meaningful share of your customers actually convert but Google Ads only sees form fills, the algorithm is bidding on incomplete information — it can't learn which keywords, ads, or audiences are actually driving your best calls, and it will under-value them accordingly. ### What is an offline conversion import and do I need one? It's a way of sending Google Ads data about what happened after the initial conversion — a lead that became a paying customer, a call that closed a deal — usually a few days or weeks later, via a CRM connection or a manual upload matched by click ID. If your sales cycle involves any follow-up before a lead becomes revenue, it's worth having, because without it the algorithm only ever sees the first step, not the outcome. ### How often should conversion tracking be checked once it's set up? Regularly, not just at launch. Site redesigns, cookie consent tools, plugin updates, and platform changes can all quietly break a tag without breaking the site itself. An account can run for weeks with a broken or degraded tag before anyone notices the drop, because the dashboard often keeps showing older cached figures rather than an obvious zero. ### Can bad conversion tracking make an account look like it's performing well when it isn't? Yes, and this is one of the more common things I find when auditing an account for the first time. Double-counted or low-value conversions can make cost-per-conversion and conversion rate look strong on the surface, while the business isn't actually getting more of what it needs. The account can be optimising itself very efficiently towards the wrong goal. ## Not sure your conversion tracking is telling the truth? I've audited plenty of accounts where the numbers looked healthy and the tracking underneath was quietly counting the wrong things. Start a conversation and I'll give you an honest read on what your account is actually optimising towards. **Call 07410 907 104**