ADT-1: Appointing Your First Auditor

Key takeaways

• Filing Form ADT-1 for a first auditor is not mandatory. Rule 4(2) of the Companies (Audit and Auditors) Rules, 2014 ties the filing obligation to Section 139(1), the AGM appointment, not Section 139(6), which governs the first auditor.
• ICSI's April 2026 letter to the Ministry confirms the filing remains optional in law.
• Form AOC-4's system validation often expects an ADT-1 reference regardless of the legal position, so most companies still file ADT-1 for the first auditor, within 15 days of the board resolution, as a practical safeguard.
• Non-government companies must appoint their first auditor within 30 days of incorporation under Section 139(6), with members getting 90 days from incorporation if the board misses that window. Government companies follow a longer CAG-board-member chain under Section 139(7).
• The first auditor holds office only until the first AGM concludes, a shorter term than the five-year appointment made later under Section 139(1).
• Section 147(1) fines the company ₹25,000 to ₹5,00,000 and officers in default ₹10,000 to ₹1,00,000 for non-appointment; the Companies (Amendment) Act, 2020 removed imprisonment for officers.
• If the first auditor resigns before the first AGM, the board fills the vacancy within 30 days under Section 139(8), and the resigning auditor, not the company, files Form ADT-3.

What is Form ADT-1?

Form ADT-1 is the notice a company files with the Registrar of Companies to record the appointment of its statutory auditor, under Section 139 of the Companies Act, 2013 and Rule 4(2) of the Companies (Audit and Auditors) Rules, 2014. Whether it's mandatory for a first auditor has been a point of confusion since the 2025 form redesign, but ICSI's April 2026 letter to the MCA Secretary confirms it remains optional in that case: filing is recommended, not legally required.

Who must appoint the first auditor, and by when

For every company other than a government company, Section 139(6) of the Companies Act, 2013 puts the appointment in the board's hands. The board must appoint an individual chartered accountant or a CA firm as the company's first auditor within 30 days from the date of registration, meaning the date on the Certificate of Incorporation. This applies regardless of whether the company has started operating. 

If the board misses that 30-day window, the obligation shifts to the shareholders. Section 139(6) requires the board to inform the members, who then have 90 days from incorporation to appoint the auditor at an extraordinary general meeting (EGM).

Government companies follow a different, three-tier chain under Section 139(7): the Comptroller and Auditor-General of India (CAG), the audit body for entities substantially owned by the government, appoints the first auditor within 60 days of registration. If the CAG doesn't act within that period, the board gets the next 30 days. If the board also misses that window, the members must appoint the auditor at an EGM within the following 60 days.

Whichever route applies, the first auditor's appointment is held only until the conclusion of the company's first annual general meeting (AGM), the yearly shareholder meeting where the company presents its financial statements. 

How to appoint your first auditor and file ADT-1, step by step

1. Identify a qualified, independent auditor. Your first auditor has to be a chartered accountant holding a valid Certificate of Practice from the Institute of Chartered Accountants of India (ICAI), either an individual or a CA firm. Before you go further, check the Section 141 disqualifications covered below; a CA who's a relative of a director or who has an existing business relationship with the company can't take the role.

2. Get written consent and the Section 141 eligibility certificate. The auditor must confirm in writing that they'll accept the appointment, and separately certify that they meet the eligibility conditions in Section 141 and aren't disqualified.

3. Convene the first board meeting and pass the appointment resolution within 30 days of incorporation. The resolution should record the auditor's name, ICAI membership number or Firm Registration Number (FRN), and the term of appointment (until the conclusion of the first AGM).

4. File Form ADT-1 on the MCA V3 portal, within 15 days of the board resolution. Under "Nature of Appointment," select "First auditor by Board of Directors." If no prior ADT-1 SRN exists for this company, MCA's own V3 guidance confirms that the placeholder SRN Z99999999 (Z followed by eight 9s) is accepted specifically for this scenario; don't substitute an unrelated or invalid number just to force the form through.

5. Send a formal letter of appointment to the auditor, confirming scope, term, and fee, and keep a signed copy with your company records.

Documents required for the ADT-1 filing

• Certified board resolution appointing the first auditor, since this is the operative act that creates the appointment under Section 139(6).
• Auditor's written consent, confirming the auditor agrees to take on the role before the company relies on that acceptance.
• Section 141 eligibility certificate from the auditor, confirming they aren't disqualified and satisfy the statutory conditions.
• Auditor's PAN, required as an identifying field on the ADT-1 form.
• Formal letter of appointment/engagement, evidencing the terms the auditor and company agreed to, useful if a dispute or audit-quality question comes up later.

Who can't be appointed as your first auditor

Section 141(3) of the Companies Act disqualifies certain people from being appointed as auditor, even if they hold a valid CA qualification. The organising logic behind the list is auditor independence: each disqualification addresses a specific way an auditor's judgment could be compromised by a financial or personal stake in the company.

• A body corporate (other than an LLP) cannot be appointed, because an audit is meant to be a personal professional judgment, not a corporate decision made by a board with its own interests.
• An officer or employee of the company, or a partner or employee of such a person, is disqualified, since auditing your own employer's books removes the independence the audit exists to provide.
• A person with a business relationship with the company, its directors, or its key managerial personnel is disqualified, to prevent a financial dependency from influencing the audit opinion.
• A relative of a director or key managerial personnel is disqualified for the same reason: family financial ties can compromise objectivity.
• A person (or their relative or partner) holding securities in the company above ₹1 lakh in face value, or indebted to the company above ₹5 lakh, or who has guaranteed a third party's debt to the company above ₹1 lakh, is disqualified, since a financial stake in the company's fortunes creates the same independence problem the audit is meant to guard against.
• Anyone convicted of fraud within the preceding 10 years is disqualified outright.

If a disqualification arises after appointment, for example a director's relative later joins the audit engagement, the auditor is required to vacate the office, which typically triggers the casual-vacancy process.

What happens if the board misses the 30-day deadline

If the 30 days pass without a board appointment, Section 139(6) shifts the responsibility to the shareholders. The board is required to inform the members, who then have 90 days from the date of incorporation, not 90 days from when the board's deadline lapsed, to appoint the first auditor at an extraordinary general meeting (EGM). 

Because the 90-day EGM window runs from incorporation rather than from the missed board deadline, a company that lets the 30-day window slip has less runway than it might assume to organise the EGM. If both the board and the members fail to appoint an auditor within their respective windows, the company has contravened Section 139, which exposes it to the certain penalties.

What happens if the first auditor resigns before the first AGM

A first auditor can resign before the first AGM, and Section 139(8) governs what happens next to fill the resulting casual vacancy, meaning an unplanned gap in the auditor's office caused by resignation rather than the ordinary end of a term. The board has 30 days to fill it. 

If the vacancy arose specifically because the auditor resigned, the board's replacement appointment additionally needs to be approved by the company at a general meeting convened within three months of the board's recommendation. The newly appointed auditor then holds office until the conclusion of the next AGM, which, for a first-auditor scenario, is the company's first AGM.

Separately, the resigning auditor (not the company) is responsible for filing Form ADT-3 within 30 days of resignation, under Section 140(2) and Rule 8 of the Companies (Audit and Auditors) Rules, 2014.

Penalties for missing the auditor deadline or filing ADT-1 late

Failing to appoint an auditor at all is a contravention of Section 139, and Section 147(1) of the Companies Act sets the penalty: the company is liable to a fine of not less than ₹25,000, extending up to ₹5,00,000, and every officer in default is liable to a fine of not less than ₹10,000, extending up to ₹1,00,000. Note that the earlier version of this provision also allowed imprisonment of up to one year for defaulting officers; the Companies (Amendment) Act, 2020 removed that imprisonment option for officers, effective 21 December 2020, leaving a fine-only consequence. Guidance that still cites imprisonment for officers under Section 147(1) is describing a position that hasn't been current since that date.

Filing ADT-1 late. ADT-1, as an event-based filing, instead attracts an additional fee calculated as a multiple of the form's normal filing fee (which itself scales with the company's authorised share capital), and that multiple increases with the length of the delay under the fee table as amended by the Companies (Registration Offices and Fees) Amendment Rules, 2022, effective 1 July 2022. The exact multiplier at each delay threshold should be confirmed against the current fee table before being quoted as a specific figure.

The first auditor's term and the transition at the first AGM

The first auditor's office ends automatically at the conclusion of the first AGM. At that meeting, the shareholders appoint an auditor under Section 139(1), who can be the same person or a different one, for a term running until the sixth AGM (subject to the auditor rotation limits under Section 139(2) where applicable). A fresh ADT-1 filed within 15 days of the AGM is unambiguously required.

FAQs on ADT-1 form

What is ADT-1 for?

Form ADT-1 is the notice a company files with the Registrar of Companies to record who its auditor is. For auditors appointed at the AGM under Section 139(1), the fourth proviso to that section requires this notice within 15 days of the meeting. For a first auditor appointed under Section 139(6), no equivalent statutory filing exists, though MCA recommends filing it anyway for transparency and to avoid friction later when filing AOC-4.

Is it mandatory to file ADT-1 every year?

No. Once an auditor is appointed under Section 139(1), typically for a five-year term running to the sixth AGM, ADT-1 is filed once for that appointment, not annually. A fresh ADT-1 is only needed when something changes: a new appointment, a reappointment of a different auditor, a resignation, or a casual vacancy.

Is ADT-1 required for LLPs?

No. ADT-1 is a Companies Act, 2013 filing tied to Section 139, which applies to companies, not limited liability partnerships. LLPs are governed by the LLP Act, 2008, and only need an audit if turnover exceeds ₹40 lakh or capital contribution exceeds ₹25 lakh in a financial year; there's no ROC form equivalent to ADT-1 in that regime.

Is ADT-01 under GST the same as ADT-1 for auditor appointment?

No, despite the similar name. ADT-01 is a GST scrutiny notice issued by tax authorities under separate GST rules; it has nothing to do with the Companies Act or the appointment of a company's statutory auditor.