TikTok Ads Manager shows 200 conversions. GA4 shows 40 from TikTok. This 5x discrepancy isn’t a tracking error — it’s two completely different measurement philosophies measuring different things. Understanding the structural reasons for the gap helps you stop trying to reconcile them and start using each number for its intended purpose.

TikTok’s Attribution Model vs GA4’s Model

TikTok counts a conversion if a user clicked or viewed an ad within the attribution window AND later converted — regardless of what happened in between. The default window is 7-day click + 1-day view. GA4 uses last non-direct click attribution by default. A user sees a TikTok ad, doesn’t click, then clicks a Google Search ad, then purchases — TikTok counts it as a view-through, Google Ads gets the click credit, GA4 attributes to Google/CPC. Three tools, three correct-but-different answers.

Why View-Through Conversions Dominate TikTok Reports

TikTok is a video platform — most engagement is passive. If users later convert, TikTok takes credit via view-through attribution. For many advertisers, 60–80% of TikTok reported conversions are view-through. GA4 sees zero of these because no click means no session means no attribution. To isolate click-based conversions: add the “Click-through Conversions” column in TikTok Ads Manager — this number will be much closer to GA4’s count.

UTM Parameters for GA4 Attribution

// TikTok ad destination URL with UTM parameters
https://yoursite.com/landing?
  utm_source=tiktok&
  utm_medium=paid_social&
  utm_campaign={{campaign_name}}&
  utm_content={{ad_name}}&
  ttclid={{ttclid}}

// Ensure "paid_social" medium maps to "Paid Social" channel
// in your GA4 Channel Grouping rules

TikTok Events API for iOS Recovery

# TikTok Events API payload
{
  "event": "Purchase",
  "event_time": 1745123456,
  "event_id": "ORDER-789",
  "user": {
    "email": "sha256_hashed_email",
    "ttclid": "stored_ttclid_from_landing",
    "ip": "user_ip",
    "user_agent": "browser_user_agent"
  },
  "properties": {"value": 99.99, "currency": "USD"}
}

How to Use TikTok Data Correctly

Stop trying to match TikTok to GA4. Use each tool for what it does best: TikTok Ads Manager for optimizing within TikTok (bidding, creative testing, audience targeting); GA4 for the full user journey and cross-channel behavior. Measure TikTok’s true impact via incrementality testing — run holdout groups to see actual lift from TikTok exposure.

Related: TikTok Pixel Standard Events, Meta Attribution Windows.