Think of Section 139 as the rulebook for hiring a company's auditor — who appoints them, for how long, and when they must be rotated out. This section is extremely high-frequency in CA Inter Auditing, appearing almost every exam as a 4–8 mark question.
The standard appointment drill. Every company appoints its auditor at the first Annual General Meeting (AGM). That auditor holds office from the conclusion of the first AGM right up to the conclusion of the sixth AGM (roughly a 5-year tenure), and thereafter till every sixth AGM. Before the appointment is formalised, the company must collect the auditor's written consent plus a certificate confirming eligibility under Section 141. Once appointed, the company files a notice with the Registrar of Companies (ROC) within 15 days of the meeting. Now, what about a brand-new company that hasn't had its first AGM yet? For non-government companies, the Board of Directors must appoint the first auditor within 30 days of incorporation. If the Board fumbles, members appoint at an EGM within 90 days of registration. This first auditor holds office only till the first AGM. For government companies, the Comptroller and Auditor-General of India (CAG) appoints within 60 days of incorporation; if CAG misses it, the Board gets 30 more days; if the Board also fails, members appoint at an EGM within 60 days. For regular (ongoing) government companies, the CAG appoints the auditor for each financial year within 180 days from the start of that financial year.
Mandatory rotation — listed and prescribed companies only. Here's where it gets exam-heavy. For listed companies and certain prescribed classes, auditor rotation is compulsory. An individual auditor can serve at most one consecutive term of 5 years, after which a 5-year cooling-off period applies before reappointment to the same company. An audit firm can serve at most two consecutive terms of 5 years (10 years total), followed by the same 5-year cooling off. Critical trap: if a newly appointed audit firm shares a common partner with the outgoing firm whose tenure just expired, that new firm is also disqualified for 5 years. Members can also voluntarily resolve to rotate the audit partner and team within a firm, or appoint more than one auditor simultaneously. For casual vacancies (auditor dies or resigns mid-year), the Board fills the gap within 30 days. However, if the vacancy arose due to resignation, the Board's appointment must be ratified at a general meeting within 3 months. For government companies, CAG fills any casual vacancy within 30 days; if CAG doesn't act, the Board steps in for the next 30 days.
📊 Worked example
Example 1 — Mandatory Rotation Timeline for a Listed Company
M/s Gupta & Associates, a CA firm, was first appointed as statutory auditor of Mehta Industries Ltd. (a listed company) at the AGM held in September 2014.
| Term | Period | Status |
|------|--------|--------|
| 1st term | Sep 2014 – AGM Sep 2019 | 5 consecutive years ✓ |
| 2nd term | Sep 2019 – AGM Sep 2024 | 5 consecutive years ✓ (max allowed) |
| Cooling-off | Sep 2024 – Sep 2029 | Cannot be reappointed |
| Eligible again | From AGM Sep 2029 | Reappointment possible |
Working: Audit firm = maximum 2 terms × 5 years = 10 years total. After completing both terms, the firm must sit out for 5 full years before it can be considered again by the same company. Answer: M/s Gupta & Associates is ineligible for reappointment at Mehta Industries Ltd. until September 2029.
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Example 2 — First Auditor Appointment (Non-Government Company)
Rajesh & Co. Pvt. Ltd. was incorporated on 1 January 2025.
Step 1 — Board's window: Board must appoint the first auditor within 30 days of registration.
Deadline = 1 January 2025 + 30 days = 31 January 2025.
Step 2 — Board failed to appoint. The Board did not act by 31 January 2025.
Step 3 — Members' window: Members must appoint at an EGM within 90 days of the date of incorporation.
Deadline = 1 January 2025 + 90 days = 1 April 2025.
Step 4 — Tenure of first auditor: Once appointed, this auditor holds office only till the conclusion of the first AGM of Rajesh & Co. Pvt. Ltd.
Answer: Members must convene an EGM and appoint the auditor on or before 1 April 2025. The auditor's tenure ends at the first AGM.
⚠️ Common exam mistakes
- Confusing '6th AGM' with '6 years': Students write 'the auditor holds office for 6 years.' Wrong — it's till the conclusion of the 6th AGM, which may not exactly be 6 calendar years. Always say 'sixth AGM.'
- Applying rotation rules to all companies: Mandatory auditor rotation (5-year terms, cooling-off) applies only to listed companies and prescribed classes — NOT to all private limited companies. Don't apply Section 139(2) rotation rules universally.
- Forgetting the GM ratification for casual vacancy by resignation: If an auditor resigns, the Board can fill the casual vacancy within 30 days, but students forget that this appointment must also be approved at a general meeting within 3 months. If it's a death or removal (not resignation), GM approval is not required.
- Mixing up first auditor timelines for Govt vs Non-Govt companies: For non-govt: Board gets 30 days, members get 90 days. For govt: CAG gets 60 days, Board gets next 30 days, members get 60 days. These numbers are a frequent one-liner MCQ trap.
- Missing the common partner disqualification: Students only check if the audit firm has changed. But even a new firm with a common partner with the outgoing firm is disqualified for 5 years. Always flag this in any scenario question involving firm rotation.
📖 Bare Act text — Section 139, Companies Act 2013
(click to expand)
(1) Subject to the provisions of this Chapter, every company shall, at the first annual general meeting, appoint an individual or a firm as an auditor who shall hold office from the conclusion of that meeting till the conclusion of its sixth annual general meeting and thereafter till the conclusion of every sixth meeting and the manner and procedure of selection of auditors by the members of the company at such meeting shall be such as may be prescribed: Provided further that before such appointment is made, the written consent of the auditor to such appointment, and a certificate from him or it that the appointment, if made, shall be in accordance with the conditions as may be prescribed, shall be obtained from the auditor: Provided also that the certificate shall also indicate whether the auditor satisfies the criteria provided in section 141: Provided also that the company shall inform the auditor concerned of his or its appointment, and also file a notice of such appointment with the Registrar within fifteen days of the meeting in which the auditor is appointed. Explanation.— For the purposes of this Chapter, "appointment" includes re-appointment. (2) No listed company or a company belonging to such class or classes of companies as may be prescribed, shall appoint or re-appoint— (a) an individual as auditor for more than one term of five consecutive years; and (b) an audit firm as auditor for more than two terms of five consecutive years: Provided that— (i) an individual auditor who has completed his term under clause (a) shall not be eligible for re-appointment as auditor in the same company for five years from the completion of his term; (ii) an audit firm which has completed its term under clause (b), shall not be eligible for re-appointment as auditor in the same company for five years from the completion of such term: Provided further that as on the date of appointment no audit firm having a common partner or partners to the other audit firm, whose tenure has expired in a company immediately preceding the financial year, shall be appointed as auditor of the same company for a period of five years: Provided also that every company, existing on or before the commencement of this Act which is required to comply with the provisions of this sub-section, shall comply with requirement of this sub-section within a period which shall not be later than the date of the first annual general meeting of the company held, within the period specified under sub-section (1) of section 96, after three years from the date of commencement of this Act: Provided also that, nothing contained in this sub-section shall prejudice the right of the company to remove an auditor or the right of the auditor to resign from such office of the company. (3) Subject to the provisions of this Act, members of a company may resolve to provide that— (a) in the audit firm appointed by it, the auditing partner and his team shall be rotated at such intervals as may be resolved by members; or (b) the audit shall be conducted by more than one auditor. (4) The Central Government may, by rules, prescribe the manner in which the companies shall rotate their auditors in pursuance of sub-section (2). Explanation.— For the purposes of this Chapter, the word "firm" shall include a limited liability partnership incorporated under the Limited Liability Partnership Act, 2008 (6 of 2009). (5) Notwithstanding anything contained in sub-section (1), in the case of a Government company or any other company owned or controlled, directly or indirectly, by the Central Government, or by any State Government or Governments, or partly by the Central Government and partly by one or more State Governments, the Comptroller and Auditor-General of India shall, in respect of a financial year, appoint an auditor duly qualified to be appointed as an auditor of companies under this Act, within a period of one hundred and eighty days from the commencement of the financial year, who shall hold office till the conclusion of the annual general meeting. (6) Notwithstanding anything contained in sub-section (1), the first auditor of a company, other than a Government company, shall be appointed by the Board of Directors within thirty days from the date of registration of the company and in the case of failure of the Board to appoint such auditor, it shall inform the members of the company, who shall within ninety days at an extraordinary general meeting appoint such auditor and such auditor shall hold office till the conclusion of the first annual general meeting. (7) Notwithstanding anything contained in sub-section (1) or sub-section (5), in the case of a Government company or any other company owned or controlled, directly or indirectly, by the Central Government, or by any State Government, or Governments, or partly by the Central Government and partly by one or more State Governments, the first auditor shall be appointed by the Comptroller and Auditor-General of India within sixty days from the date of registration of the company and in case the Comptroller and Auditor-General of India does not appoint such auditor within the said period, the Board of Directors of the company shall appoint such auditor within the next thirty days; and in the case of failure of the Board to appoint such auditor within the next thirty days, it shall inform the members of the company who shall appoint such auditor within the sixty days at an extraordinary general meeting, who shall hold office till the conclusion of the first annual general meeting. (8) Any casual vacancy in the office of an auditor shall— (i) in the case of a company other than a company whose accounts are subject to audit by an auditor appointed by the Comptroller and Auditor-General of India, be filled by the Board of Directors within thirty days, but if such casual vacancy is as a result of the resignation of an auditor, such appointment shall also be approved by the company at a general meeting convened within three months of the recommendation of the Board and he shall hold the office till the conclusion of the next annual general meeting; (ii) in the case of a company whose accounts are subject to audit by an auditor appointed by the Comptroller and Auditor-General of India, be filled by the Comptroller and Auditor-General of India within thirty days: Provided that in case the Comptroller and Auditor-General of India does not fill the vacancy within the said period, the Board of Directors shall fill the vacancy within next thirty days. (9) Subject to the provisions of sub-section (1) and the rules made thereunder, a retiring auditor may be re-appointed at an annual general meeting, if— (a) he is not disqualified for re-appointment; (b) he has not given the company a notice in writing of his unwillingness to be re-appointed; and (c) a special resolution has not been passed at that meeting appointing some other auditor or providing expressly that he shall not be re-appointed. (10) Where at any annual general meeting, no auditor is appointed or re-appointed, the existing auditor shall continue to be the auditor of the company. (11) Where a company is required to constitute an Audit Committee under section 177, all appointments, including the filling of a casual vacancy of an auditor under this section shall be made after taking into account the recommendations of such committee.
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