Understanding Form ADT-3: Auditor Resignation Statement

When a statutory auditor resigns mid-tenure, the company and the outgoing auditor share a tightly defined regulatory obligation under section 140(2) of the Companies Act, 2013. Form ADT-3 is the auditor's statement of resignation, capturing the reasons for stepping down and any material concerns about the audit. It is one of the most consequential disclosures in the MCA filing universe — a vehicle for the auditor to publicly flag governance lapses. In 2026, ADT-3 continues on the MCA V3 portal with mandatory XBRL validation.

When ADT-3 is triggered

ADT-3 must be filed when an auditor resigns before the end of their appointed term — usually a five-year term for statutory auditors of companies (other than OPCs and small companies). Resignation can stem from professional disagreements, conflicts of interest, fee disputes, governance concerns, or routine retirement decisions. The key trigger is voluntary resignation, distinct from removal under section 140(1) or non-reappointment under section 139.

Statutory timeline

• Auditor must file ADT-3 within 30 days of resignation.
• Form is filed by the resigning auditor, not the company.
• Filing must include the reasons for resignation and any other facts deemed relevant.
• Failure attracts penalty under section 140(3) — currently ₹50,000 or remuneration of the auditor (whichever is lower), and ₹500 per day for continuing default, up to ₹5 lakh.

Information captured

1. CIN and details of the company.
2. Date of original appointment of the auditor.
3. Date of resignation and effective date.
4. Detailed reasons for resignation.
5. Any material concerns about the audit, financial statements, or company conduct.
6. DSC of the resigning auditor (Class 3).

Why the reasons matter

ADT-3 is the only public disclosure where an auditor can articulate concerns about the company. SEBI, lenders, investors, and regulators specifically read ADT-3 filings when assessing governance risk. Vague reasons like 'personal reasons' or 'pre-occupation' are scrutinised. Auditors should disclose factual concerns clearly while staying within the bounds of professional ethics and confidentiality. Companies, in turn, may file representations if they disagree with the auditor's narrative.

Company's parallel obligation

Once the auditor resigns, the company must appoint a casual vacancy auditor within 30 days under section 139(8). The appointment requires approval at the next general meeting within three months. The casual vacancy auditor holds office until the conclusion of the next AGM. ADT-1 is filed for the new appointment, while the resigning auditor handles ADT-3. The two filings together signal continuity to the Registrar of Companies.

Drafting the resignation letter — what to include

The auditor's resignation letter that accompanies ADT-3 is read by lenders, regulators, and incoming auditors. It should be factual, dated, and tied to specific events. Include the date of original appointment, the date and effective date of resignation, the reason in factual terms, and any material concerns about accounting policies, internal controls, or company conduct that the auditor believes should be disclosed in the public interest. Avoid emotive language or speculation. Keep a signed copy in your professional file along with email correspondence with the company. Where applicable, send a copy of the resignation to the chairman of the audit committee separately to ensure board-level awareness.

Implications for the company and incoming auditor

An ADT-3 filing has cascading effects on the company. Lenders may invoke covenants that require notification of auditor change. Listed companies must intimate the stock exchanges within 24 hours. The incoming auditor will typically request a no-objection from the outgoing auditor under ICAI's professional ethics framework, review prior period financials, and assess any qualifications, key audit matters or going-concern issues flagged earlier. Companies should not treat auditor resignation as a routine event — engage the audit committee actively, document the reasons for any disagreement, and ensure the new auditor onboarding does not skip critical risk assessment steps.

Best practices for the company's audit committee

On receipt of an auditor's resignation, the audit committee should convene within seven days, review the auditor's stated reasons, document a board-level response, and brief the new auditor before appointment. Many disagreements between auditor and company can be resolved with audit committee mediation before resignation becomes inevitable. Where resignation is unavoidable, the audit committee should ensure no continuity gap in audit coverage, preserve workpapers and prior communications, and refresh its understanding of internal controls. The audit committee's role under section 177 is to safeguard the integrity of financial reporting; an auditor exit is one of the clearest tests of that role.

Conclusion

ADT-3 is a small form with outsized regulatory weight. For auditors, it is both a duty and a protection — a documented exit with stated reasons. For companies, it is a public record that lenders and investors will read carefully. File on time, draft reasons with precision, and complete the section 139(8) cycle promptly to avoid governance flags.