An auditor’s resignation creates two separate compliance tracks under the Companies Act, 2013. The first belongs to the outgoing auditor: the resignation must be reported in the prescribed statement. The second belongs to the company: the resulting casual vacancy has to be filled through the procedure in section 139. Treating the resignation letter itself as the end of the process can therefore leave both the auditor and the company with unfinished statutory steps.
The statutory framework is in sections 139 and 140 of the Companies Act, 2013. The prescribed form is confirmed by Rule 8 of the Companies (Audit and Auditors) Rules, 2014, which states that an auditor who has resigned shall file the statement in Form ADT-3.
What the outgoing auditor must do
Section 140(2) requires an auditor who resigns to file, within thirty days from the date of resignation, a statement with the company and the Registrar. The statement must indicate the reasons for resignation and other facts that may be relevant. In the case of companies covered by section 139(5), the statement is also to be filed with the Comptroller and Auditor-General of India.
Rule 8 identifies Form ADT-3 as the prescribed statement for this purpose. The legal responsibility is placed on the resigning auditor, so the company should not assume that its own internal acceptance of the resignation substitutes for the auditor’s statutory filing.
Why the reasons for resignation matter
ADT-3 is not merely a change-of-auditor notice. Section 140(2) specifically requires reasons and other relevant facts. A useful resignation file should therefore keep the signed resignation communication, the factual basis for the stated reasons, important correspondence with management or those charged with governance, and evidence of the filing. The description should be accurate and sufficiently clear rather than vague boilerplate that obscures a material circumstance.
The Act also attaches a specific consequence to non-compliance. Under section 140(3), failure by the auditor to comply with section 140(2) can attract a penalty of ₹50,000 or an amount equal to the auditor’s remuneration, whichever is less. A continuing failure can attract a further ₹500 for each day after the first, subject to the statutory maximum of ₹2 lakh.
Resignation is different from removal
Resignation and removal should not be mixed into one checklist. Resignation is initiated by the auditor and triggers the section 140(2) statement and ADT-3 process. Removal before expiry of the auditor’s term is a company-driven action under section 140(1). It requires previous approval of the Central Government, a special resolution of the company, and a reasonable opportunity for the auditor to be heard.
This distinction is important because a company cannot simply label a removal as a resignation to avoid the statutory process, and an auditor who resigns cannot assume that the company’s replacement process is the same as an ordinary AGM appointment.
What happens to the vacancy after resignation?
For a company other than one whose accounts are audited by an auditor appointed by the Comptroller and Auditor-General of India, section 139(8) requires a casual vacancy in the office of auditor to be filled by the Board of Directors within thirty days. Where the vacancy is caused by resignation, there is an additional member-approval step: the appointment must also be approved by the company at a general meeting convened within three months of the Board’s recommendation. The auditor appointed to fill the vacancy holds office until the conclusion of the next annual general meeting.
Where the company is required to constitute an Audit Committee under section 177, section 139(11) says appointments, including filling a casual vacancy, are to be made after taking into account the Audit Committee’s recommendations. The company should therefore build that governance step into the timeline instead of obtaining a recommendation after the Board has already acted.
Special route for CAG-audited companies
Section 139(8)(ii) contains a different route for a company whose accounts are subject to audit by an auditor appointed by the Comptroller and Auditor-General of India. The CAG is to fill the casual vacancy within thirty days. If the CAG does not fill it within that period, the Board is to fill the vacancy within the next thirty days. This is why a generic private-company resignation checklist should not be reused for a Government-company situation without checking the applicable statutory route.
Worked example: two clocks start from one resignation
Assume the statutory auditor of a non-CAG company resigns during the year. From the auditor’s side, the section 140(2) thirty-day clock for the prescribed statement starts from the date of resignation. From the company’s side, the Board must address the casual vacancy within the section 139(8) framework. Because the vacancy arose from resignation, member approval at a general meeting is also required within three months of the Board’s recommendation.
The practical lesson is that the two clocks should be tracked separately. The auditor’s ADT-3 filing does not appoint the successor, and the company’s appointment of a successor does not discharge the outgoing auditor’s section 140(2) filing responsibility.
Practical auditor resignation checklist
- Fix the effective resignation date. Keep the signed communication and ensure the date used for statutory tracking is clear and consistent.
- Document the reasons and relevant facts. Prepare wording that accurately reflects the circumstances and is supported by the engagement file.
- Track the auditor’s filing. Calendar the thirty-day section 140(2) period and retain evidence that the prescribed statement was filed with the required recipients.
- Identify the correct vacancy route. Determine whether the company follows the normal Board/member process or the CAG route.
- Use the Audit Committee where applicable. Obtain its recommendation before the appointment decision where section 139(11) applies.
- Complete the Board step promptly. For a non-CAG company, address the casual vacancy within the statutory thirty-day framework.
- Schedule member approval for a resignation vacancy. Convene the general meeting within three months of the Board’s recommendation.
- Check successor eligibility. Before appointment, complete the normal eligibility, consent, independence and disqualification checks applicable to the incoming auditor.
- Preserve one linked file. Keep the resignation, ADT-3 evidence, governance approvals, successor documentation and appointment filings cross-referenced.
Common mistakes
- Assuming the resignation letter itself satisfies the ADT-3 requirement.
- Treating resignation and removal as interchangeable processes under section 140.
- Tracking only the outgoing auditor’s filing and forgetting the company’s section 139(8) casual-vacancy steps.
- Filling a resignation vacancy at Board level but missing the subsequent general-meeting approval required for a non-CAG company.
- Ignoring the Audit Committee recommendation where section 139(11) applies.
- Using an old MCA form screenshot without checking the current portal fields, authentication and filing mechanics.
Practical takeaway
An auditor resignation is best managed as a coordinated handover rather than a single form filing. The outgoing auditor should complete the section 140(2) statement in Form ADT-3 within the statutory period and accurately state the reasons and relevant facts. At the same time, the company should activate the correct section 139(8) casual-vacancy route, including Audit Committee involvement where applicable and member approval when resignation caused the vacancy. Keeping those responsibilities and timelines separate is the simplest way to prevent a mid-year auditor change from becoming a compliance gap.
