Auditor Resignation Services
Section 140(2), Form ADT-3, and Casual Vacancy Compliance

When a statutory auditor resigns before the expiry of their term, the event triggers two separate compliance chains that must run simultaneously: the auditor is required to file Form ADT-3 with the MCA within 30 days of the date of resignation, providing a statement of reasons; and the company is required to fill the resulting casual vacancy within 30 days of the resignation, after which Form ADT-1 must be filed within 15 days of the new appointment. Neither obligation can wait for the other. An auditor who resigns without filing Form ADT-3 is subject to a penalty of up to Rs. 5 lakh. A company that does not fill the casual vacancy promptly is operating without a statutory auditor — a material violation of the Companies Act, 2013 that exposes every director of the company to personal liability under Section 147. The speed and precision with which an auditor resignation is handled determines whether the company continues its compliance calendar without disruption or faces a domino of missed deadlines and penalties.

N D Savla & Associates, Chartered Accountants based in Mumbai, provides complete auditor resignation compliance services for both companies and auditors. For companies whose auditor has resigned: we manage the Board Meeting to accept the resignation, identify and onboard a replacement auditor, obtain the incoming auditor’s consent and eligibility certificate, file Form ADT-1 within 15 days, and ensure that all pending audit work is completed or formally handed over. For auditors who need to resign from a statutory audit engagement: we advise on the correct grounds for resignation, the content requirements for Form ADT-3, the mandatory fraud reporting obligations that must be discharged before resignation, and the filing process on the MCA21 portal at mca.gov.in. This page completes the three-page auditor compliance series alongside our Auditor Appointment Services and Auditor Rotation Services pages.

Auditor resignations are more consequential than they appear. An auditor who resigns mid-year leaves the company without an auditor during the active audit period — a period that may include preparation of quarterly financial statements, GST reconciliation, tax audit under Section 44AB of the Income Tax Act, and other scheduled certifications. The incoming auditor appointed to fill the casual vacancy must pick up the audit at whatever stage the outgoing auditor left it, understanding prior audit history and any issues identified. Simultaneously, the Board of Directors must convene a meeting, accept the resignation, and formally resolve to appoint a replacement — all within the 30-day window. N D Savla & Associates provides rapid-response support to ensure this disruption is managed without compliance failure.

Section 140(2) — The Resignation Framework

Section 140(2) of the Companies Act, 2013 provides:

“The auditor who has resigned from the company shall file within thirty days from the date of resignation, a statement in the prescribed form with the company and also with the Registrar, and in case of companies referred to in sub-section (5) of Section 139, the auditor shall also file such statement with the Comptroller and Auditor-General of India, indicating the reasons and other facts as may be relevant with regard to his resignation.”

The key elements of Section 140(2): the obligation is on the auditor (not the company) to file Form ADT-3; the filing is with both the company AND the Registrar of Companies (on MCA21); the 30-day period runs from the date of resignation (not the date of acceptance by the company); and the form must contain the reasons for resignation and any other relevant facts. The requirement to state reasons publicly is designed to prevent auditors from resigning silently to avoid reporting fraud or to escape scrutiny for a difficult audit.

Auditors resign from statutory audit engagements for a range of reasons, some routine and some serious:

• Fee disputes: Non-payment or underpayment of audit fees is one of the most common practical reasons for resignation. An auditor cannot be expected to continue incurring expenses on an audit without receiving agreed remuneration.
• Non-cooperation by management: If the management does not provide the auditor with access to books of accounts, supporting documents, or information requested, the auditor cannot form an opinion. Persistent non-cooperation can make it impossible to conduct a proper audit.
• Discovery of potential fraud or material irregularity: Where the auditor discovers evidence of fraud or irregularities that management is unwilling to address, the auditor may resign. However, the fraud reporting obligation under Section 143(12) must be discharged BEFORE resignation — see the detailed section below.
• Disagreement on accounting treatment: Persistent disagreement with management on significant accounting matters (revenue recognition, provisioning for losses, related-party disclosures) where management is unwilling to accept the auditor’s position may make the engagement untenable.
• Restructuring of audit firm: The audit firm itself may restructure, merge, or demerge, resulting in the current audit firm ceasing to exist in its current form. This may require a formal resignation and re-appointment of the successor firm.
• Personal or professional conflict of interest discovered mid-term: If a new director or KMP is appointed who is a relative of a partner in the audit firm — creating a Section 141(3) disqualification mid-term — the auditor must resign because they have become disqualified.
• Mandatory rotation reached: While technically not a resignation (the auditor’s term simply expires), companies sometimes formally resign rather than simply complete their term — see our
• Auditor Rotation Services page for the distinction between resignation and rotation.

Form ADT-3 — The Auditor’s MCA Filing on Resignation

Form ADT-3 is filed BY THE AUDITOR who has resigned — not by the company. This is a crucial distinction that is frequently misunderstood. The company’s obligation on the date of resignation is to accept the resignation, convene a Board Meeting, and begin the process of filling the casual vacancy (by filing Form ADT-1 for the new auditor). The outgoing auditor’s independent obligation is to file Form ADT-3 with: (a) the company (by delivering a physical or electronic copy of the filed Form ADT-3 to the company); and (b) the Registrar of Companies (by filing on the MCA21 portal at mca.gov.in). The two actions are simultaneous and independent. Just as a resigning company director must file DIR-11 independently of the company’s DIR-12 filing, the resigning auditor must file Form ADT-3 independently of the company’s Form ADT-1 for the replacement auditor.

Form ADT-3 requires the following information and declarations from the resigning auditor:

• Details of the company: Name, CIN, registered office address of the company from which the auditor is resigning
• Auditor details: Name of the CA or audit firm, ICAI Membership Number (for individual CA) or Firm Registration Number (for firm), address, and contact details
• Date of resignation: The specific date on which the resignation takes effect
• Reasons for resignation: A clear, honest statement of the reasons prompting the resignation. Section 140(2) requires “reasons and other facts as may be relevant”. This is not a formality — the reasons disclosed in Form ADT-3 become part of the MCA public record and are viewed by the Registrar and potential incoming auditors.
• Statement on pending proceedings: Whether there are any pending proceedings or actions by regulatory authorities (Income Tax Department, SEBI, RBI, etc.) against the company that the resigning auditor is aware of
• Declaration by the auditor: A declaration that the statement is true and correct to the best of knowledge and belief
• DSC of the auditor: Form ADT-3 is filed on MCA21 using the auditor’s own digital signature (registered with ICAI)

Form ADT-3 must be filed within 30 days of the date of resignation. The 30-day period is calendar days, not business days. Late filing or non-filing attracts:

• Section 140(3) penalty: Every auditor who fails to file Form ADT-3 within the prescribed 30 days shall be punishable with a fine of not less than Rs. 50,000 and not more than Rs. 5,00,000
• This penalty applies to the auditor personally — not to the company
• Where the auditor is a firm, the penalty falls on the firm and the individual partner responsible for the audit
• The Registrar of Companies has the power to initiate prosecution proceedings against an auditor who has resigned but failed to file Form ADT-3

The company’s compliance obligations on auditor resignation are time-sensitive and must be managed in parallel with the outgoing auditor’s Form ADT-3 filing:

Step 1 — Accept the Resignation at a Board Meeting

The moment the company receives the resignation letter from the auditor, the Board of Directors should convene a Board Meeting (or pass a circular resolution if permitted under the Articles and the Companies Act). At the Board Meeting, the Board should: acknowledge receipt of the resignation letter; record the date of resignation and the effective date; pass a resolution accepting the resignation; authorise the Audit Committee (or the Board itself, if there is no mandatory Audit Committee) to identify and appoint a replacement auditor; and note the 30-day deadline for filling the casual vacancy under Section 139(8).

Step 2 — Fill the Casual Vacancy Within 30 Days — Section 139(8)

Section 139(8) of the Companies Act provides that any casual vacancy in the office of an auditor shall be filled by the Board of Directors within 30 days. Where the casual vacancy is caused by resignation, the appointment to fill the vacancy must also be ratified by the company’s members (shareholders) at a General Meeting held within 3 months of the Board Resolution. The Board’s appointment is immediate and effective from the Board Resolution date; the General Meeting ratification is a subsequent confirmation. For identifying and vetting the replacement auditor (including consent, eligibility certificate, Section 141 compliance, and the 20-company ceiling check), see our Auditor Appointment Services page for the complete process.

The new auditor appointed to fill the casual vacancy holds office from the date of the Board Resolution until the conclusion of the next AGM. At the next AGM, the shareholders formally appoint or re-appoint the auditor through an Ordinary Resolution.

Step 3 — File Form ADT-1 Within 15 Days of the Board Resolution

After the Board passes the resolution appointing the replacement auditor, the company must file Form ADT-1 on the MCA21 portal at mca.gov.in within 15 days. The Form ADT-1 for a casual vacancy appointment specifies the category as “Casual Vacancy” and includes: the name, Membership Number (or FRN) of the incoming auditor; the date of Board Resolution; the incoming auditor’s consent letter and eligibility certificate; and the DSC of a director of the company. The 15-day Form ADT-1 deadline and the 30-day casual vacancy filling deadline run from different starting points (15 days from Board Resolution; 30 days from date of resignation), so both must be tracked simultaneously.

Step 4 — General Meeting Ratification Within 3 Months

Where the casual vacancy was caused by resignation, the appointment made by the Board must be ratified by the members at a General Meeting within 3 months of the Board Resolution. Call an Extraordinary General Meeting (EGM) or arrange for the ratification at the next AGM (if the AGM falls within 3 months). The EGM notice should include the Ordinary Resolution for ratification of the casual vacancy appointment. No separate Form ADT-1 needs to be filed for the GM ratification if the same auditor is being ratified — the original Form ADT-1 filed after the Board Resolution covers the appointment. However, if a different auditor is appointed at the GM (which is permitted — the members are not bound to ratify the Board’s choice), a fresh Form ADT-1 must be filed within 15 days of the GM.

Auditor resignation and mandatory rotation both result in the current auditor leaving and a new auditor being appointed — but they are fundamentally different events with different procedures, different forms, and different obligations for both the company and the outgoing auditor. For the complete mandatory rotation framework, see our Auditor Rotation Services page:

Trigger: Resignation — auditor’s voluntary act; Rotation — compulsory at end of maximum term (5 years for individual CA, 10 years for firm)

Timing: Resignation — can happen at any point during the term; Rotation — happens at the AGM when maximum term expires

Outgoing auditor’s MCA filing: Resignation — Form ADT-3 (mandatory, within 30 days); Rotation — no separate form required (term simply ends at AGM)

Company’s obligation: Resignation — fill casual vacancy within 30 days, Form ADT-1 within 15 days, GM ratification within 3 months; Rotation — appoint new auditor at AGM, Form ADT-1 within 15 days

Central Government approval needed: Resignation — No; Rotation — No (rotation at end of term is not removal); Removal before term — Yes (Section 140(1) Form ADT-2)

Incoming auditor restriction: Resignation — No restriction; Rotation — 5-year cooling-off applies to outgoing firm/CA; network firm restriction applies

Section 143(12) — Mandatory Fraud Reporting Duty

Section 143(12) of the Companies Act, 2013 imposes a mandatory fraud reporting obligation on the statutory auditor. If in the course of performing their duties, the auditor has reason to believe that an offence of fraud involving the company’s affairs has been or is being committed, they must:

• Report the matter to the Board of Directors or the Audit Committee (as applicable) immediately — and in any case within 2 days
• If the Board/Audit Committee does not take satisfactory action on the fraud report within 60 days, report the matter to the Central Government (Ministry of Corporate Affairs) in Form ADT-4, regardless of any instruction from management to the contrary
• This reporting obligation overrides any confidentiality agreement, management direction, or shareholder instruction

The Section 140(2) requirement for the auditor to state reasons for resignation in Form ADT-3 is specifically designed to prevent a practice that existed before the Companies Act, 2013: auditors who discovered fraud or material irregularities sometimes simply resigned without reporting, to avoid the professional and legal complications of fraud reporting. Under the current framework:

• An auditor who resigns after discovering potential fraud WITHOUT first completing the Section 143(12) reporting process has not discharged their statutory duty
• The Form ADT-3 statement of reasons creates a public record: if an auditor lists the existence of unresolved management disagreements or unverified irregularities as reasons for resignation without also having completed the Section 143(12) reporting, the MCA can inquire into the auditor’s compliance
• Under ICAI’s professional standards, an auditor is expected to complete their reporting obligations before resigning from an engagement where fraud is suspected
• Post-resignation, an auditor who discovered fraud during their tenure may still be required to provide information and testify in any subsequent investigation or prosecution, regardless of the fact that they have resigned

Auditor resignations mid-year create audit continuity challenges. The practical implications depend on when in the audit cycle the resignation occurs:

If the auditor resigns before commencing the annual audit (for example, early in the financial year, well before the year-end), the impact on audit continuity is minimal. The incoming auditor picks up a relatively clean engagement: they are present for the full audit cycle, from year-end balance sheet preparation through to the audit report. This is the least disruptive scenario, and the company should try to fill the casual vacancy and onboard the incoming auditor before any significant audit work is due to begin.

If the auditor resigns after the financial year has ended (after 31 March for most companies) but before the annual audit report has been signed, the situation is more complex. The incoming auditor:

• Must review all audit work performed by the outgoing auditor to date — but cannot simply rely on it without independent verification under ICAI Standards on Auditing (SA 510 and SA 300)
• May need to re-perform certain audit procedures if the outgoing auditor’s documentation is inadequate or if the areas covered by the outgoing auditor carry significant risk
• Will need to sign the final audit report independently, based on their own professional judgment formed on the basis of their own and the outgoing auditor’s combined work
• Requires access to the outgoing auditor’s working papers, which the outgoing auditor is professionally obligated to make available

If the auditor resigns after signing the audit report for the year (but before the formal appointment of the new auditor at the AGM), the audit continuity concern is relatively low for the concluded year. The resignation effectively means the company will be without an auditor for the period between the resignation and the AGM appointment. The incoming auditor appointed to fill the casual vacancy will handle all certifications and representations required until the next AGM.

The resignation of a statutory auditor and the resignation of a director share structural similarities in the compliance framework but differ in critical ways. Understanding the parallel helps the company’s compliance team correctly identify which forms, timelines, and stakeholders apply to each:

Director Resignation (Section 168): See our

• Company files: DIR-12 (within 30 days of resignation taking effect)
• Replacement: Not mandatory (unless it leaves the company below minimum directors)
• No fraud reporting obligation specific to director resignation

Auditor Resignation (Section 140(2)):

• Auditor files: Form ADT-3 (within 30 days of resignation) — this page
• Company files: Form ADT-1 (within 15 days of replacement appointment) + Board fills casual vacancy within 30 days + GM ratification within 3 months
• Replacement: Mandatory — casual vacancy must be filled within 30 days
• Fraud reporting obligation: Must be discharged before resignation if fraud was discovered during the audit

The key structural difference is that auditor resignation triggers a mandatory replacement obligation (unlike director resignation where replacement is optional above the minimum). This is because an unaudited company is a categorical compliance failure, whereas a board operating below ideal size (but above the statutory minimum) is permissible.

A company and its audit firm of 7 years have a dispute over audit fees. The firm resigns in June (mid-financial year). The firm files Form ADT-3 citing fee-related reasons. The company convenes an emergency Board Meeting within 10 days, passes a resolution appointing a new audit firm, files Form ADT-1 within 15 days of the Board Resolution, and calls an EGM within 3 months for shareholder ratification. The new firm reviews the outgoing firm’s working papers from the prior year and plans the audit for the current financial year. Disruption is moderate but manageable.

A company appoints a new Finance Director whose father is a partner in the company’s audit firm. This creates a Section 141(3) disqualification for the audit firm (relative serving as director). The audit firm has no choice but to resign immediately upon discovering the disqualification. The firm files Form ADT-3 disclosing the disqualification as the reason for resignation. The company must immediately fill the casual vacancy. The new auditor is appointed without the Section 141(3) conflict. This scenario illustrates why regular eligibility checks are important — both by the audit firm and the company — whenever new directors or KMPs are appointed.

During the audit of a listed company, the auditor discovers potential evidence of systematic revenue overstatement. The auditor reports the matter to the Audit Committee under Section 143(12). The Audit Committee takes 45 days to respond, and the response is unsatisfactory. The auditor then reports to the Central Government in Form ADT-4 (day 60). After completing the reporting process, the auditor files a resignation and Form ADT-3 citing the circumstances. This is the correct sequence — fraud reporting completed before resignation. The incoming auditor is briefed by the company that the matter has been reported to the government and is under investigation, and must factor this into their audit risk assessment.

Two mid-tier audit firms merge to form a new firm. The audit firm that was serving as statutory auditor of a company ceases to exist. The merged firm is effectively a new entity. The outgoing (merged) firm files Form ADT-3 citing the merger as the reason for resignation. The company can then appoint the new merged firm as its auditor (subject to normal Section 141 eligibility checks and noting that the new firm’s tenure for mandatory rotation purposes starts fresh from the appointment date). The Auditor Rotation Services implications of a firm merger mid-term should be carefully assessed.

Before the Companies Act, 2013, auditor resignation in India was largely unregulated. An auditor could resign by giving notice to the company, and there was no mandatory public disclosure of the reasons for resignation. This allowed auditors who discovered frauds or irregularities to quietly resign without reporting, avoiding the professional complexity of whistleblowing. The lack of transparency around auditor resignations meant that companies could have multiple auditor changes in quick succession without any public accountability for why.

The Companies Act, 2013 introduced Section 140(2) and Form ADT-3 as part of a comprehensive overhaul of auditor accountability provisions. The requirement for auditors to publicly file reasons for resignation on MCA21 was designed to bring transparency to a previously opaque process. The 30-day filing deadline and the Rs. 5 lakh maximum penalty were set at levels intended to make non-compliance genuinely costly for auditors. The simultaneous requirement to file with both the company and the Registrar ensures that both parties have documented evidence of the resignation event.

Following the Companies Act, 2013, the Institute of Chartered Accountants of India issued guidance on the professional obligations of auditors who are considering resignation: the requirement to complete fraud reporting before resignation; the obligation to provide a truthful and complete ADT-3 statement; and the duty to facilitate a smooth handover to the incoming auditor. ICAI’s Ethical Standards Board has also opined on the content that must be disclosed in Form ADT-3 to avoid being seen as a material omission.

Form ADT-3 is filed BY THE AUDITOR who has resigned, within 30 days of the date of resignation, disclosing the reasons for resignation. It is a mandatory filing by the outgoing auditor. Form ADT-1 is filed BY THE COMPANY when the replacement auditor is appointed to fill the casual vacancy, within 15 days of the Board Resolution making the appointment. Both filings are required in an auditor resignation scenario, but they are filed by different parties (outgoing auditor and company respectively) and at different times. This is analogous to the DIR-11 / DIR-12 structure for director resignations.

Yes. An auditor can resign at any point, including before the annual audit report is signed. If the audit report has not yet been signed, the incoming auditor appointed to fill the casual vacancy must complete the audit independently. The incoming auditor will review the outgoing auditor’s working papers and may re-perform certain audit procedures based on their professional judgment. An auditor who resigns before completing the audit should ensure that all audit documentation is in order and available for the incoming auditor to review.

No. An auditor’s resignation does not require Central Government approval. Central Government approval is only required for the REMOVAL of an auditor before the expiry of their term (Section 140(1) — a company-initiated action). Resignation is the auditor’s own voluntary act, and the company simply accepts it. There is no formal MCA approval process for accepting an auditor’s resignation. The only MCA filings required are Form ADT-3 (by the auditor) and Form ADT-1 (by the company for the replacement appointment). For the distinction between removal and resignation, and the applicable procedures, see our Auditor Appointment Services page.

The auditor who fails to file Form ADT-3 within 30 days of resignation is subject to a fine of not less than Rs. 50,000 and not more than Rs. 5,00,000 under Section 140(3). This penalty is personal to the auditor. The company’s obligations (filling the casual vacancy, filing Form ADT-1) are unaffected by the auditor’s failure to file ADT-3 — the company must still comply with its own obligations within its own timelines. The company should not wait for the outgoing auditor to file ADT-3 before initiating the replacement appointment process.

Yes, in principle — unlike mandatory rotation (where there is a strict 5-year cooling-off period), an auditor who has resigned is not automatically barred from future re-appointment at the same company. However, the incoming auditor who fills the casual vacancy can be re-appointed at the next AGM. If the company wants to re-appoint the original (resigned) auditor, they would need to be formally appointed afresh (with consent, eligibility certificate, and Form ADT-1) after a gap. The reasons for the original resignation should be considered before re-appointment — if the resignation was due to fraud concerns or management disagreements, the circumstances that caused the resignation must have been resolved. For rotation companies, the re-appointment must also comply with the remaining term limits under Section 139(2). See our Auditor Rotation Services page for the rotation implications.