AICPA Seeks Public Comment on Proposed Updates to Attestation Standards

Why It Matters

The changes broaden the assurance landscape to include sustainability data, forcing CPA firms to adapt services and offering early adopters a market advantage.

Key Takeaways

• AICPA seeks comments on new sustainability attestation standards
• AT‑C 325/330 cover exam and review of sustainability data
• Existing SSAE 18, 21, 22 will be superseded
• Effective for engagements starting June 15 2029
• Comments due June 30 2026; early adoption permitted

Pulse Analysis

Sustainability reporting has moved from a niche disclosure to a core component of corporate transparency, driven by investor demand and emerging regulations. As stakeholders seek comparable, reliable ESG data, assurance providers are under pressure to expand beyond traditional financial audits. The AICPA’s proposed attestation updates respond to this shift, embedding sustainability into the fabric of standard practice and signaling that assurance professionals will play a pivotal role in validating non‑financial metrics.

The exposure draft introduces two dedicated AT‑C sections—325 for examinations and 330 for reviews of sustainability information—creating a clear framework for practitioners. By superseding SSAE 18, 21 and 22, the board consolidates guidance, reducing fragmentation and aligning attestation methodology with modern risk environments such as digital assets and cybersecurity. The proposed standards are scheduled for adoption next year, with a firm effective date of June 15 2029, though early implementation is permissible, allowing forward‑thinking firms to pilot the new requirements.

For CPA firms, the proposal presents both a compliance challenge and a growth opportunity. Engaging in the comment process enables firms to shape the final standards, ensuring practicality and relevance to day‑to‑day engagements. Early adopters can differentiate themselves by offering certified sustainability assurance, meeting client expectations and positioning themselves for future regulatory mandates. The June 30 2026 comment deadline is a critical window for the profession to influence the evolution of attestation services and to prepare operationally for the expanded scope.