GA4 and WooCommerce sales don't match: why and how to fix it

When GA4 and WooCommerce disagree on sales, the gap almost always comes from a handful of specific faults, not from GA4 being unreliable. Here is what to check, in the order worth checking it.

First, decide which way the gap goes

GA4 lower than WooCommerce means conversions are being lost before GA4 sees them. GA4 higher means something is being counted twice. The direction tells you which half of this guide to read, so compare GA4 revenue against WooCommerce’s own order total for the same dates first.

When GA4 is lower than WooCommerce

• The purchase event isn’t firing reliably on the order-received page, often because a plugin or theme change moved or broke it.
• A cookie banner is blocking the tag for everyone who doesn’t accept, so those orders never register.
• Customers leave to a separate payment domain (some gateways) and the session breaks, so the purchase isn’t tied back.
• Ad-blockers and iOS quietly remove a slice of browser-side events.

When GA4 is higher than WooCommerce

This is nearly always duplication. Two common causes: both a WooCommerce GA4 plugin and a GTM setup are firing the purchase, so every order is counted twice; or the order-received page gets reloaded or revisited and re-fires the event. The fix is a single source of truth for the purchase event and a consistent transaction_id so GA4 can recognise and drop duplicates.

The transaction_id that quietly fixes a lot

Every purchase event should carry the WooCommerce order ID as its transaction_id. With it, GA4 can deduplicate repeated reports of the same order automatically. Without it, GA4 has no way to tell two pings of order 1234 apart, which inflates revenue and is one of the most common WooCommerce mismatches.

How close is acceptable

A healthy WooCommerce setup lands GA4 within a few percent of actual revenue and stays steady. A persistent 15 to 30 percent gap, or one that drifts, is a tracking fault worth fixing rather than a quirk to live with.

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