Preparing for IAB TCF 2.3: Key Changes and Compliance Steps

Introduction

The IAB Transparency and Consent Framework (IAB TCF 2.3) marks an important evolution in how any organization collecting personal data manages consent within the digital advertising ecosystem. While earlier versions of the consent framework focused on structuring consent signals and aligning them with GDPR requirements, TCF 2.3 strengthens vendor disclosure, increases user transparency, and introduces clearer accountability for vendors processing data.

IAB TCF 2.3 was officially announced on June 19th, 2025, and becomes mandatory on February 28th, 2026, replacing TCF 2.2.

At its core, TCF 2.3 aims to ensure that when an organization is collecting personal data, users know exactly who may process that data and for what purposes. This directly supports the General Data Protection Regulation (GDPR), guidance from national data protection authorities, and expectations shaped by the European Data Protection Board. It also reinforces the legal basis under which data processing occurs, particularly when organizations rely on explicit consent.

For enterprises navigating complex data privacy compliance requirements, preparing for TCF 2.3 is not just a technical update. The TCF 2.3 updates are not limited to technical changes; they have legal and operational impacts for any organization collecting personal data or delivering ads in the EU. It is a strategic opportunity to strengthen user consent management, improve consent and preference management practices, reduce compliance risk, and turn transparency into a competitive advantage.

Vendor Disclosure and Disclosed Vendors Segment

One of the most significant changes introduced in IAB TCF 2.3 is the mandatory “Disclosed Vendors” segment in the consent string. In earlier versions, vendors could receive consent signals without clear confirmation that they had actually been shown to the user. This created vendor disclosure ambiguity and uncertainty around whether vendors were properly disclosed before processing personal data.

With TCF 2.3, consent signals must now explicitly indicate which vendors were disclosed to users in the consent interface. This means that if a vendor is going to process data or rely on consent, there must be technical proof that the user had visibility into that vendor. The disclosed vendors segment enhances data governance and classification enhancing data governance by ensuring that transparency is embedded into the consent framework itself.

This update strengthens user transparency across the digital advertising ecosystem. It ensures that disclosed vendors align precisely with what users see in the consent banner or preference center. As a result, vendors processing data can rely on consent signals with greater certainty, and organizations reduce the risk of unlawful data processing.

Audit Current Vendor Disclosure Statements

Before implementing TCF 2.3 changes, organizations must conduct a thorough audit of current vendor disclosure statements. This involves reviewing every vendor listed in consent management platforms and confirming that the vendor names, purposes, and descriptions presented to users are accurate and complete.

An audit should examine whether vendors are clearly disclosed in user-facing interfaces and whether their data processing purposes match their declarations in the Global Vendor List. If a vendor relies on legitimate interest for certain purposes, that must also be transparently communicated. Inaccurate or incomplete vendor disclosures can undermine user trust and expose organizations to compliance risk.

This stage is critical for enterprises that depend heavily on digital marketing, advertising technologies, analytics, and personalization tools. By auditing vendor disclosures early, organizations can ensure that their disclosed vendors segment will reflect reality once the CMP generates updated consent signals under TCF 2.3.

Consent Management Platform (CMP) Updates and Consent Management

Modern consent management platforms must now update consent management platforms to support the technical specifications required by IAB TCF 2.3. This includes generating TC strings that contain the disclosed vendors segment and accurately reflecting the vendors that users saw and interacted with.

To comply with TCF 2.3, CMPs must be Google-certified.

Selecting a TCF 2.3-certified consent management platform like Pandectes ensures that organizations can update consent management workflows without rebuilding their compliance systems from scratch. A compliant CMP helps implement compliant consent workflows, generate updated consent signals, and transmit consent signals consistently across web and app environments.

Beyond technical updates, CMP interfaces must also strengthen user transparency. Consent banners should clearly present disclosed vendors, describe purposes in understandable language, and avoid dark patterns that manipulate user choices. CMPs must display the total number of vendors and provide clear examples of data use without legal jargon. Transparent design prioritizes user consent and aligns with consent and preference principles.

Organizations should also schedule CMP vendor and integration tests to confirm that consent signals are being generated and interpreted correctly by advertising partners, analytics systems, and other vendors processing data. This testing ensures seamless signal transmission and reduces downstream disruption in digital advertising and marketing operations.

Users must be able to easily re-open the consent interface to review or modify their choices.

Transmit Consent Signals and Disclosed Vendors

Accurate transmission of consent signals is central to compliance and operational continuity. Once a user makes a choice in the consent banner, the CMP generates a TC string that communicates that choice to downstream vendors. Under TCF 2.3, this TC string must include the disclosed vendors field.

Organizations must ensure that ad tech partners, analytics tools, and vendors processing data are able to read and interpret the updated consent signals. If a vendor cannot correctly parse the disclosed vendors segment, it may either process data unlawfully or stop processing data altogether, affecting campaign performance.

Testing consent transmission across web and mobile app environments is essential. Companies should verify that consent signals are consistently transmitted, stored correctly, and respected across systems. This step strengthens user consent management and reduces compliance risk in increasingly complex data environments.

Consent and Preference Management

TCF 2.3 reinforces the principle that consent and preference management should prioritize user control. The consent banner should serve as a transparent entry point where users can clearly understand how their personal data will be processed.

A well-designed first-layer banner should explain the legal basis for processing, the purposes involved, and the role of vendors. It should allow users to obtain explicit consent or reject non-essential data processing without friction. Providing a clear one-click withdrawal mechanism further strengthens user transparency and aligns with GDPR expectations.

On the second layer, organizations should capture granular preferences. Users should be able to differentiate between analytics, personalization, digital advertising, and other data uses. This granular consent and preferences strategy empowers individuals and enhances trust.

Consent and preferences should also be stored in immutable logs. Maintaining tamper-proof records of consent choices supports audit readiness and demonstrates accountability to national data protection authorities.

Consent and Customer Connection

Consent is not a standalone compliance exercise; it should integrate with broader customer data systems. Syncing consent flags to CRM customer records ensures that marketing automation tools, email systems, and customer engagement platforms respect user preferences.

When marketing automation respects consent signals, organizations avoid sending communications that conflict with user choices. This alignment between consent and customer connection reduces compliance risk and fosters long-term trust.

Auditing customer journeys is equally important. Enterprises should examine every stage of the user lifecycle, from initial website visit to purchase and post-sale engagement, to ensure that consent enforcement is consistently applied. This holistic approach strengthens unified consent management and supports compliance and competitive advantage.

Preference Management Empowers Consumers

Preference management empowers consumers by giving them meaningful control over their data. A strong preference center should include clear toggles for different purposes and vendors, accompanied by concise explanations.

Providing understandable descriptions of each preference supports informed decision-making. When users understand why data is collected and how it benefits them, they are more likely to engage positively with consent requests.

Cross-device preference synchronization further strengthens user trust. Preferences unified preference management ensures that consent choices follow users across platforms, rather than being limited to a single browser session. This consistency enhances both user experience and data privacy compliance.

Preferences Maximizing Marketing Mileage

Consent-driven marketing strategies can unlock measurable benefits. By segmenting audiences based only on consented purposes, organizations can build campaigns that respect user consent while maximizing relevance.

Scheduling campaigns using consent-safe segments ensures that marketing efforts align with user preferences. This not only reduces legal exposure but can also improve campaign lift and engagement metrics.

Marketing leaders increasingly recognize that preferences unlocking customer insights leads to better personalization strategies. When consented data is treated as a valuable asset rather than a default assumption, preference-maximizing marketing mileage becomes a powerful driver of loyalty and trust.

Preferences Maximizing Data

Data minimization is a cornerstone of data privacy compliance. Organizations should define minimal data points required for each marketing or operational use case and restrict data collection to consented identifiers only.

Preferences maximizing data means aligning data retention limits with user choices. If a user withdraws consent, related data processing should cease, and retention policies should be enforced accordingly.

Enterprises navigating data complexity must document retention rules, ensure proper classification, enhance data governance, and integrate preferences data management into broader first-party data strategies. This approach strengthens responsible data strategies while reducing compliance risk.

Disclosed Vendors Segment Verification and Disclosed Vendors

Ongoing verification is critical to maintaining compliance with IAB TCF 2.3. Organizations should validate Global Vendor List IDs against generated TC strings to ensure accuracy.

Running regular checks for undisclosed vendor flags can prevent misconfigurations from persisting unnoticed. If a vendor’s disclosure status changes, CMP settings should be updated immediately to reflect that change.

Continuous website risk monitoring and exploring automated web scanning tools can further strengthen vendor oversight. These proactive measures reduce compliance risk and demonstrate a commitment to responsible consent management.

Implementation Roadmap and Compliance Steps

A structured implementation roadmap ensures a smooth transition to TCF 2.3. Organizations should create phased rollouts with defined testing milestones and clearly assigned responsibilities.

Pre-launch technical and legal audits help confirm that consent workflows align with technical specifications and regulatory requirements. Training operations and marketing teams on new consent flows ensures organization-wide awareness.

Recording decisions, configuration updates, and change logs is essential for audit purposes. If regulators or data protection authorities request documentation, clear records will demonstrate that compliance was prioritized.

Monitoring, Reporting, and DPA Readiness

Compliance with TCF 2.3 is not a one-time project; it requires continuous monitoring. Automated alerts for TC string failures or signal discrepancies help detect issues early.

Preparing DPA response templates and evidence packs ensures readiness in case of regulatory inquiries. Organizations should schedule quarterly reviews of vendor disclosures, CMP configurations, and consent workflows.

By embedding monitoring into everyday operations, enterprises strengthen global consent management requirements, streamline data privacy compliance, and maintain alignment with evolving data protection regulations.

Conclusion

Preparing for IAB TCF 2.3 requires a coordinated effort across vendor disclosure, consent management platforms, signal transmission, and preference management. While the framework introduces technical updates, its true impact lies in strengthening user transparency and clarifying accountability within the digital advertising ecosystem.

Organizations that prioritize user consent, implement compliant consent workflows, and integrate consent into broader customer systems can reduce compliance risk while unlocking strategic value. By aligning consent and preferences strategy with data governance best practices, enterprises can enable responsible data strategies and transform compliance into a lasting competitive advantage.