Google Tag Manager and Consent: The Complete Setup Guide for 2026
Running GTM without proper consent integration in 2026 is a compliance and revenue risk.
- Consent Mode V2 = CMP ↔ Google tags bridge
- TCF 2.3 TC Strings for programmatic
- Non-Google tags need custom consent checks
Step 1: Install CMP
Before GTM container snippet.
Step 2: Consent Mode V2
FlexyConsent sets automatically.
Step 3: Default denied (EEA)
Automatic geo-based defaults.
Step 4: Verify
Tag Assistant confirmation.
- GTM before CMP = tags fire without consent
- No Advanced Mode = lose 50-70% conversion data
- Custom HTML tags bypass Consent Mode
FlexyConsent
One script, auto Consent Mode V2, TCF 2.3, zero config. Client + server GTM.
FlexyConsent — Google Certified CMP.
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