Auditor Appointment in an OPC: First and Statutory Auditor Rules Explained

Auditor Appointment in an OPC: First and Statutory Auditor Rules Explained

You have just incorporated your One Person Company (OPC) and you are finally ready to focus on the business. Then someone mentions "auditor appointment," and suddenly you are staring at a compliance requirement you did not budget time for. It happens to almost every first-time OPC founder — the excitement of getting the Certificate of Incorporation makes it easy to forget that the compliance clock has already started ticking.

The good news is that appointing an auditor for an OPC is a fairly straightforward process once you understand the timeline and the forms involved. This guide walks you through exactly when to appoint your first auditor, how the appointment differs from a regular statutory auditor appointment in later years, what documents you need, and the mistakes that most commonly lead to penalties.

What is Auditor Appointment in an OPC

Every company registered under the Companies Act, 2013 — including a One Person Company — is required to have its financial statements audited by a qualified Chartered Accountant every financial year. This is done by appointing a statutory auditor, whose job is to independently examine the company's books of accounts and give an opinion on whether they present a true and fair view of the company's financial position.

For an OPC specifically, the process happens in two stages:

• First Auditor: appointed by the Board of Directors within a short window after incorporation, without needing shareholder approval at this stage (since an OPC has a single member, this step is simplified compared to other companies).
• Subsequent/Statutory Auditor: appointed after the first auditor's term, usually for a further term as permitted under the Act, and this appointment is intimated through the appropriate filing with the Registrar of Companies (RoC).

The appointment of the first auditor (and any subsequent auditor) must be reported to the RoC using Form ADT-1, which is the standard form for intimating auditor appointment details, regardless of company type.

Because an OPC has only one member/shareholder, some of the shareholder-approval formalities that apply to private and public companies are simplified — but the requirement to appoint an auditor and file ADT-1 still applies in full.

Why It Matters

Skipping or delaying auditor appointment is one of the most common — and most avoidable — compliance lapses among OPC founders.

• Legal requirement, not optional: every OPC must have its accounts audited annually; there is no exemption based on turnover or being a "single person" company.
• Filing deadlines are strict: failing to appoint the auditor within the prescribed period, or failing to file ADT-1 on time, can attract additional fees and penalties that increase the longer the delay continues.
• Audited financials are needed for everything else: banks, investors, tenders, and even routine annual filings (like the financial statements filed with the RoC) all require audited books.
• Director accountability: as the sole director of your OPC, the responsibility to ensure timely auditor appointment rests entirely on you — there is no co-director to share or catch the oversight.
• Avoiding compounding compliance issues: a missed auditor appointment often cascades into missed annual return filings, which compounds penalties over time.

Eligibility and Who is Involved

Understanding who can be appointed, and who has the authority to appoint, avoids most of the confusion around OPC auditor rules.

• Who can be appointed as auditor: only a practising Chartered Accountant (an individual CA or a CA firm) holding a valid Certificate of Practice is eligible to be appointed as the auditor of an OPC.
• Who cannot be appointed: a person who is an officer or employee of the company, a body corporate (other than a CA firm structured as a limited liability partnership where partners are practising CAs), or someone disqualified under the independence provisions of the Companies Act (for example, having a business relationship or substantial financial interest in the company).
• Who appoints the first auditor: the Board of Directors of the OPC — since an OPC typically has one director who is also the sole member, this decision is recorded through a simple board resolution.
• What happens if the Board fails to appoint: if the Board does not appoint the first auditor within the prescribed time, the member (sole shareholder) of the OPC has the power to make the appointment.
• Consent required: the proposed auditor must give written consent to the appointment and a certificate confirming they are eligible and not disqualified under the Companies Act before the appointment is finalised.

Documents and Information Needed

To complete an auditor appointment for an OPC smoothly, keep the following ready:

• Board resolution appointing the first auditor (or the resolution for subsequent auditor appointment).
• Written consent letter from the auditor, confirming willingness to act as the company's auditor.
• Eligibility certificate from the auditor, stating that the appointment, if made, will be in accordance with the conditions prescribed under the Companies Act, and that the auditor is not disqualified.
• Auditor's membership number and Certificate of Practice number (issued by ICAI).
• PAN and other basic KYC details of the auditor/audit firm, for filing purposes.
• Company's CIN, date of incorporation, and registered office details, required while filing Form ADT-1.
• Digital Signature Certificate (DSC) of the director for signing and filing ADT-1 electronically.

Step-by-Step Process for Auditor Appointment in an OPC

1. Identify a practising Chartered Accountant (or CA firm) willing to act as the company's auditor, and confirm they are not disqualified under the Companies Act.
2. Obtain written consent and an eligibility certificate from the proposed auditor before finalising the appointment.
3. Pass a Board Resolution appointing the auditor as the company's first auditor (for a newly incorporated OPC) or as the subsequent auditor (in later years).
4. Communicate the appointment to the auditor formally through a letter of appointment, referencing the board resolution.
5. File Form ADT-1 with the RoC within the prescribed time from the date of appointment, attaching the board resolution, the auditor's consent, and the eligibility certificate.
6. Pay the applicable RoC filing fee for Form ADT-1, based on the company's authorised share capital.
7. Retain the acknowledgment/SRN (Service Request Number) generated after filing, as proof of timely compliance.
8. Record the appointment in the company's statutory registers, including the register of auditors if maintained.
9. Repeat the process for subsequent auditor appointments once the current auditor's term is due to end, following the same board resolution and ADT-1 filing steps.

Cost and Fees in 2026

The cost of appointing an auditor in an OPC has two components — the auditor's professional fee and the government filing fee for Form ADT-1.

• RoC filing fee for ADT-1 is nominal and is generally linked to the company's authorised share capital slab, similar to other RoC forms; it stays in the modest range for small OPCs with standard capital.
• Additional/late fees apply on a per-day basis if ADT-1 is filed beyond the prescribed deadline, and these can add up quickly the longer the delay continues.
• Auditor's professional fee for the annual audit itself is a separate, negotiated cost between the company and the CA/firm, and varies based on the size of the company's transactions, complexity of accounts, and the auditor's experience.
• Professional service fee, if you engage a firm like Legal Suvidha to manage the appointment, resolution drafting, and ADT-1 filing on your behalf, is typically a modest one-time charge bundled with your annual compliance package.

Since RoC fee slabs and late-filing penalties are revised periodically, please verify the current rate before making payment, or ask Legal Suvidha for an exact quote covering both the filing and professional fees.

Timeline

Getting the timing right is the single most important part of OPC auditor compliance.

• First auditor appointment: the Board of Directors is expected to appoint the first auditor within a short period after incorporation — well within the first few months of the company's existence, and in any case before the first financial statements are due.
• ADT-1 filing for first auditor: to be filed with the RoC within the prescribed number of days from the date of the Board's appointment resolution.
• Subsequent auditor appointment: as the earlier auditor's term concludes, a fresh (or continuing) appointment needs to be made, again followed by an ADT-1 filing within the prescribed window.
• Annual audit completion: the auditor should complete the audit well in time for the company to meet its annual financial statement filing deadlines with the RoC.

Because deadlines are counted from the date of the board resolution (not the date you "get around to it"), it is best to appoint the auditor and file ADT-1 within days of incorporation rather than leaving it for later.

First Auditor vs Statutory Auditor: Key Distinctions

Founders often assume "first auditor" and "statutory auditor" are two completely different things — they are not; one simply precedes the other.

• First Auditor: appointed by the Board of Directors shortly after incorporation, without requiring approval in a general meeting (a simplification that applies broadly, and is especially straightforward in an OPC given there is only one member).
• Statutory/Subsequent Auditor: appointed after the first auditor's term ends, generally for a further term as permitted under the Companies Act, and every appointment (first or subsequent) must be reported through Form ADT-1.
• Approval mechanism: in a typical private or public company, subsequent auditor appointments often need approval of members in a general meeting; in an OPC, since the sole member is often also the sole director, this approval is effectively a formality but still needs to be properly documented.
• Removal or resignation: an auditor can be removed before the term ends only through the specific procedure prescribed under the Companies Act (which includes special resolution and government approval in some cases), and any casual vacancy caused by resignation must also be filled and reported.

Common Mistakes to Avoid

• Forgetting to appoint the first auditor immediately after incorporation, assuming there is no rush since the company just started operating.
• Not filing Form ADT-1 even after appointing the auditor through a board resolution — many founders mistakenly believe the resolution alone is sufficient compliance.
• Appointing a disqualified auditor, such as a relative acting informally without a valid Certificate of Practice, or someone with a conflicting financial interest in the company.
• Missing the ADT-1 filing deadline, resulting in escalating additional fees the longer the delay continues.
• Not obtaining written consent and the eligibility certificate from the auditor before filing, which can lead to the filing being treated as incomplete or invalid.
• Ignoring the subsequent auditor appointment once the first auditor's term ends, assuming the original appointment continues indefinitely without any further action.
• Poor record-keeping, such as not retaining the board resolution, consent letter, or ADT-1 acknowledgment for future reference during assessments or due diligence.

Frequently Asked Questions

Is it mandatory for an OPC to appoint an auditor?

Yes. Every OPC registered under the Companies Act, 2013 must appoint a statutory auditor to audit its financial statements every year; there is no exemption for OPCs based on their single-member structure.

Who appoints the first auditor of an OPC?

The Board of Directors appoints the first auditor within the prescribed period after incorporation. If the Board fails to do so within that time, the sole member of the OPC has the authority to make the appointment.

What is Form ADT-1 and why is it needed?

Form ADT-1 is the form used to intimate the Registrar of Companies about the appointment of an auditor, whether it is the first auditor or a subsequent one. Filing it is mandatory and forms part of the company's statutory compliance record.

Can a relative of the sole member be appointed as the OPC's auditor?

A relative can be appointed only if that person is himself or herself a practising Chartered Accountant with a valid Certificate of Practice and is not otherwise disqualified under the independence provisions of the Companies Act; being a relative alone does not create disqualification, but other conflict-of-interest rules must still be checked.

What happens if the first auditor is not appointed on time?

If the OPC misses the prescribed window for appointing the first auditor, the power to appoint shifts to the member (sole shareholder), and continued delay can expose the company and its director to penalties and compliance notices from the RoC.

How long is the term of the first auditor in an OPC?

The first auditor generally holds office until the conclusion of a specified period as provided under the Companies Act, after which a subsequent auditor appointment needs to be made following the same process.

Does the auditor need to give consent before being appointed?

Yes. The proposed auditor must provide written consent along with a certificate confirming eligibility and that the appointment complies with the conditions prescribed under the Companies Act, before the company can finalise and file the appointment.

Can the same auditor continue for multiple years in an OPC?

Yes, subject to the applicable term limits and rotation requirements (where they apply) under the Companies Act, an auditor can be reappointed for further terms, with each appointment or reappointment properly documented and filed with the RoC.

How Legal Suvidha Makes This Effortless

This is exactly the kind of process where one wrong document, a mismatched detail, or a missed deadline turns into a rejection, a resubmission, or a running penalty. Legal Suvidha handles the whole thing end-to-end so you can focus on your business.

• Fixed, all-inclusive price quoted upfront — professional fee plus government fee, itemised, with no hidden charges appearing later.
• A dedicated Chartered Accountant / Company Secretary who owns your case from the first call to the final certificate.
• Proactive updates and deadline alerts at every stage — we do not disappear after payment.
• Trusted by 10,000+ founders with a 4.9/5 rating and a multi-disciplinary team of CAs, CSs and lawyers.

Talk to a Legal Suvidha expert today for a free consultation and an exact, transparent quote on WhatsApp — and get it done right the first time.