Is Your Conversion Tracking Lying to You? A Tracking Audit
Before you audit anything else in a Google Ads account, audit the tracking. Every other number, the ROAS, the cost per conversion, the Smart Bidding decisions, is built on the conversion data. If that data is wrong, the whole account is being optimised towards a lie, and no amount of clever bidding fixes a bad foundation. Here is how to check your tracking is telling the truth before you trust a single report.
Why tracking is the foundation
Conversion tracking is the one thing that has to be right, because everything else depends on it. Smart Bidding optimises towards the conversions you report. You judge keywords, campaigns and budgets on the conversions you report. If those conversions are overcounted, undercounted or just wrong, every decision downstream is wrong too, and confidently so.
This is why a good audit starts here and refuses to move on until it is satisfied. An account with beautiful-looking numbers built on broken tracking is more dangerous than one with honest, ugly numbers, because it fools everyone into trusting it.
The checks that catch most problems
A handful of checks catch the most common tracking faults. First, is every conversion counted once? A conversion action set to count "every" instead of "one" can inflate leads by counting the same person's repeat form fills. Check whether reported conversions look suspiciously high against what the business actually sees.
Second, does the number in Google Ads roughly match reality? Line up Google Ads conversions against the back end, the CRM, or GA4. They will never match exactly, because of attribution windows and models, but a large unexplained gap is a red flag. Third, is the right thing being counted? A newsletter signup tracked as a purchase, or a thank-you page firing on every visit, quietly poisons the data.
Double counting and the thank-you page trap
The most common tracking fault is double counting, and the classic cause is the conversion tag firing more than once. A tag on a thank-you page that someone can refresh, or reach more than once, counts a conversion every time. Suddenly one sale is two or three in the reports.
The effect is nasty, because it makes everything look better than it is. ROAS inflates, cost per conversion drops, and Smart Bidding, trusting the inflated numbers, bids up on whatever is double counting. You end up spending more to chase conversions that were never really there. In an audit, checking that each conversion fires exactly once is one of the highest-value things you can do.
Is it measuring value, or just counting?
Even tracking that fires correctly can be too blunt. Counting conversions treats every lead or sale as equal, when they are not. A £500 order and a £20 order both count as one conversion, so the bidding optimises towards volume, not value.
A proper tracking setup passes back the value of each conversion, and ideally something close to profit rather than raw revenue, so the bidding knows which conversions are worth chasing. In an audit, it is worth asking not just whether tracking works, but whether it is feeding the account a rich enough signal. Counting is the minimum. Value is what lets the account optimise towards money rather than just activity.
The order to check it
Run the tracking audit in this order: first confirm each conversion fires once and only once, because double counting does the most damage. Then check the reported numbers against the back end for a large unexplained gap. Then confirm the right actions are being counted, not signups mislabelled as sales. Then look at whether value, ideally profit, is being passed, not just counts. Get through that and you can trust the rest of the audit. Skip it, and everything else you measure is built on sand.
FAQs
Why audit conversion tracking first? Because every other number depends on it. ROAS, cost per conversion and Smart Bidding all rely on the conversion data, so if tracking is wrong, every decision built on it is wrong too.
What is the most common tracking problem? Double counting, usually from a conversion tag firing more than once, often on a thank-you page that can be refreshed or revisited. It inflates results and misleads both you and Smart Bidding.
How do I know if my tracking is accurate? Check that each conversion fires once, compare Google Ads conversions against your back end or CRM for any large unexplained gap, and confirm the right action is being counted, not a signup mislabelled as a sale.
Why won't Google Ads match my CRM exactly? Because of different attribution windows and models. A small difference is normal. A large, unexplained gap is the warning sign worth investigating.
Should my tracking pass back value or just count conversions? Value, ideally close to profit. Counting treats every conversion as equal, so the bidding chases volume. Passing value lets the account optimise towards money rather than activity.