Is your Google Ads conversion tracking working? A 12-point checklist

1. Is your primary conversion really your main business result?

A page view, an add to cart, a WhatsApp click and a purchase are not equally important. Decide clearly which actions you want Google Ads bid strategies to learn from. A purchase or a qualified lead can be the primary goal; micro-interactions can stay secondary, for observation only. In Google Ads, primary actions are counted in the Conversions column and used for bidding, while secondary actions appear only under All conversions.

If many weak actions are set as primary conversions, the system can drift toward the signals that are easiest to increase. Separate the business result first, then the intermediate steps that support it.

2. Does the tag fire at the right moment, and only once?

A purchase can be counted twice if the tag fires before payment completes, when the thank-you page is reloaded, or when the same event is sent both by the Google tag and through a Google Analytics 4 import. Google also warns that if a plugin on your CMS or store platform manages your tags, you should make sure the site isn’t tagged twice, which can cause duplicate conversion reporting. With forms, a button click can record a conversion before the submission has actually succeeded.

Run a real test flow with Google Tag Assistant and your browser’s developer tools. Check when the event fires, whether it fires again on reload and which conversion action it reaches in Google Ads.

• Does the tag fire only after a successful order or submission?
• Is the same transaction sent again when the page is reloaded?
• Are the Google tag and the GA4 import counting the same result twice?
• Have test and live IDs been mixed up?

3. Are the value, currency and transaction ID right?

In e-commerce, the real value of each order should be sent dynamically. A fixed sample value makes ROAS and value-based bidding meaningless. The currency has to match your order system, and the team should know whether tax, shipping and discounts are included in the value.

The transaction ID is a critical control for deduplicating repeat sends of the same order. Google explains why: if a customer returns to the conversion page or reloads it, the same tag can fire again and count a second conversion for the same order; when two conversions for the same action carry the same transaction ID, Google Ads treats the second as a duplicate and doesn’t count it. If the ID is empty, changes on every send or isn’t tied to the order, conversions can inflate on reloads and return visits. The opposite mistake hurts too: Google warns that sending the same hard-coded ID for different orders leads to significant undercounting, because it may process only the first.

4. Do your counting and attribution settings suit your sales model?

For e-commerce purchases you usually want every sale counted; for lead generation, counting several forms sent by the same person in a short time as separate successes can mislead. Check the Count setting on each conversion action against your business model: Every counts every conversion that happens after an ad interaction, while One counts only one conversion per ad click.

The conversion window and the attribution model can also make reports look different from other systems. The aim is not to force every tool to show the same number, but to know the reason for the gap and which report to use for which decision.

5. Do lead quality and returns flow back into the account?

A submitted form doesn’t mean every lead is worth the same. If your sales team can sort outcomes into stages such as qualified, appointment, proposal and sale, you can send the ad system a stronger value signal. Otherwise the campaign learns to find the cheapest forms while sales quality may fall.

In e-commerce, if cancellations and returns aren’t deducted from the platform value, past ROAS stays higher than it really was. Set up regular conversion adjustments, or a net-order comparison in your business intelligence reporting.

What should you check? The 12-point checklist

Don’t stop at a healthy-looking status in the interface. Verify each point below with a real test transaction and the record in your business system.

• Primary and secondary conversions are separated.
• The account-default goals fit the campaign objective.
• The tag fires only on a successful transaction.
• Reloading the page or going back doesn’t create a second count.
• The GA4 import and the Google Ads tag don’t overlap.
• The order value is dynamic and carries the real amount.
• The currency is sent correctly.
• The transaction ID is unique and never empty.
• The counting method suits your sales or lead model.
• The conversion window fits your sales cycle.
• The impact of spam leads, cancellations and returns is tracked separately.
• The test result was compared across the browser, Google Ads and your business system.

Why is a bid strategy only as smart as its data?

Conversion tracking isn’t a technical task you set up once and forget. Re-test it whenever the site, the payment provider, the forms or the analytics setup change. A weekly data health check should come before campaign optimisation, because faster optimisation on the wrong data only makes the error bigger.