How to File ADT-3 for Auditor Resignation (MCA V3 Guide)

How to File ADT-3 for Auditor Resignation (MCA V3 Guide)

Your statutory auditor has decided to resign, or maybe you are the auditor who has decided to step away from an engagement, and now there is a filing to think about. If you are a founder, this can feel like one more compliance headache landing on your desk at the worst possible time. If you are the auditor, you probably already know the drill but want to make sure you get the MCA V3 process right this time.

Either way, the form you need is ADT-3. Unlike some other MCA filings, this one has a very specific and often misunderstood rule: it is the auditor, not the company, who is responsible for filing it. Let us walk through what ADT-3 covers, who should file it, the documents needed, and the exact steps to complete it on the new MCA V3 portal.

What is ADT-3 and Why It Exists

ADT-3 is the form prescribed under the Companies Act, 2013 for a statutory auditor to formally notify the Registrar of Companies (ROC) that they have resigned from their position as auditor of a company. This applies whether the auditor is an individual chartered accountant or an audit firm.

The logic behind this form is straightforward. A company's auditor plays a critical role in financial oversight, and if an auditor exits mid-tenure, regulators want an independent, first-hand account of why. That is precisely why the law places the filing obligation on the auditor rather than leaving it to the company to report. It reduces the chance of a resignation being hidden, delayed, or misrepresented by company management, especially in cases where the resignation itself might be linked to disagreements over financial reporting, non-cooperation, or other red flags.

For founders, this is important to understand: even though you are not the one who files ADT-3, you as the company still have parallel obligations, like informing the ROC of the vacancy and appointing a new auditor within the prescribed timeline. So while ADT-3 itself is the auditor's job, do not assume that means no action is needed on the company's side.

Who Must File ADT-3 and When

Who files: The resigning statutory auditor, whether an individual practicing chartered accountant or an audit firm, is responsible for filing ADT-3. This applies to auditors of private companies, public companies, and other companies covered under the statutory audit requirements of the Companies Act.

When to file: The generally followed timeline is that ADT-3 should be filed within 30 days from the date of resignation. This window is the standard compliance benchmark used across the profession, though you should always verify the current applicable period, since procedural timelines can be updated by the Ministry from time to time.

Situations where ADT-3 typically comes into play include:

• An auditor resigning due to non-payment of fees or unresolved fee disputes
• Resignation following disagreements with management over financial statements or audit findings
• An auditor stepping down because of a conflict of interest or new engagement restrictions
• Voluntary resignation due to workload, retirement, or firm restructuring
• Resignation triggered by concerns over related-party transactions or suspected irregularities

In sensitive cases, particularly those involving suspected fraud or serious governance concerns, auditors also have additional reporting obligations beyond just ADT-3, so it is worth taking professional advice on whether any other disclosure is triggered.

It also helps to understand the difference between a "casual vacancy" and a resignation that happens at a more routine point in the audit cycle. When an auditor resigns mid-term, this is treated as a casual vacancy in the office of auditor, and the company has a separate obligation to fill that vacancy, often within a tighter timeline than a routine reappointment scenario. This is one more reason auditors should not delay their ADT-3 filing, since the company's own clock for filling the vacancy is often running in parallel, and any ambiguity about the exact resignation date can complicate both sides of the compliance trail.

Documents Required for ADT-3 Filing

Keep the following ready before starting the filing:

• Resignation letter submitted by the auditor to the company, clearly dated and stating the effective date of resignation
• Reasons for resignation, documented clearly, since this is a mandatory field in the form itself
• Acknowledgement of resignation from the company, if available
• Engagement letter or appointment details, including the date of original appointment as auditor (Form ADT-1 reference, if available)
• Digital Signature Certificate (DSC) of the auditor, or an authorised signatory in case of an audit firm
• Membership number and firm registration number (FRN) of the chartered accountant or firm
• CIN of the company for which the resignation is being filed
• Any supporting correspondence relevant to the circumstances of resignation, especially if there was a dispute

Step-by-Step: How to File ADT-3 on MCA V3

1. Log in to the MCA V3 portal using the auditor's registered credentials. Individual CAs and audit firms typically need to have their professional details, including membership number, updated on their profile.

1. Ensure the DSC is linked to the filing profile. ADT-3 must be digitally signed by the auditor (or an authorised partner, in the case of a firm).

1. Search for and open Form ADT-3 from the list of company e-forms available on the portal.

1. Enter the company's CIN to auto-populate basic company details such as name, registered office, and existing auditor records.

1. Fill in resignation details, including the date of appointment as auditor, the date of resignation, and the specific reasons for resigning as required by the form.

1. Attach supporting documents, including the resignation letter and any other relevant correspondence, in the accepted file formats.

1. Review all auto-filled and manually entered fields carefully, since mismatches between the company's records and the auditor's filing are a common cause of rejection.

1. Affix the Digital Signature Certificate of the auditor or the authorised signatory.

1. Pay the prescribed government filing fee through the portal's online payment options.

1. Submit the form and download the SRN (Service Request Number) as proof of filing. Retain this acknowledgment for your professional records.

1. Monitor the filing status on the MCA portal to confirm it has been taken on record without objections or resubmission requests.

Given that MCA V3 introduced revised validation logic and a different user interface compared to the earlier system, many audit firms prefer routing such filings through a compliance professional familiar with the current portal quirks, especially for time-sensitive resignations.

Fees and Penalties in 2026 (Approximate, Please Verify)

MCA fee structures for auditor-related filings are generally modest compared to filings tied to a company's share capital, but they are still subject to periodic revision. As a general guide only:

• A standard filing fee applies to ADT-3, and this is typically a fixed amount rather than one linked to capital slabs, though you should confirm this on the portal at the time of filing
• Delayed filing beyond the prescribed window can attract additional fees, which may increase depending on how many days the filing is delayed
• Beyond monetary fees, a delayed or missing ADT-3 filing can also raise questions during regulatory scrutiny of the audit engagement, which is a professional risk auditors should take seriously independent of the fee itself

Since exact fee amounts and penalty multipliers are periodically updated by the Ministry of Corporate Affairs, please treat these as indicative and verify current figures directly on the MCA portal or with a compliance professional before filing.

Common Mistakes to Avoid

• Assuming the company will handle the filing – ADT-3 is specifically the auditor's responsibility, not the company's
• Vague or incomplete reasons for resignation – the form requires clear reasons, and generic statements can invite queries or rejection
• Missing the 30-day filing window, especially when resignation happens amid a dispute and the auditor delays formalising it
• Not retaining proof of when the resignation letter was sent to the company, which matters if there is ever a dispute about timelines
• Incorrect CIN or mismatched company details, a surprisingly common error that stalls the filing
• Firms not updating partner or authorised signatory details before attempting to sign the form digitally
• Failing to check whether additional reporting obligations apply, particularly in resignations linked to suspected financial irregularities
• Not informing the company in writing before filing ADT-3, which can create confusion about the effective resignation date on the company's side
• Overlooking the casual vacancy angle entirely, and not flagging to the company that its own clock to fill the auditor vacancy has started running alongside the ADT-3 filing
• Treating the ADT-3 filing as the end of the process, when in reality good practice includes a brief handover note or exit communication to the incoming auditor, especially in disputed exits, to keep the audit trail clean for everyone involved

Frequently Asked Questions

Who is responsible for filing ADT-3, the auditor or the company?

The resigning auditor is responsible for filing ADT-3 with the ROC. This is different from many other compliance forms where the company itself is the filer. The company has its own separate obligations, such as filling the auditor vacancy, but ADT-3 specifically belongs to the auditor.

What happens if the auditor does not file ADT-3 on time?

Late filing can attract additional fees that increase with the delay period, and it may also raise questions later if the circumstances of resignation come under regulatory or professional scrutiny. It is best to file within the standard window and avoid unnecessary delay.

Do I need to explain the reason for resignation in detail?

Yes, the form requires the auditor to state reasons for resignation. It is advisable to be clear and factual, since vague reasons can attract follow-up queries, and in some situations, resignations linked to financial irregularities may trigger separate disclosure obligations.

Is ADT-3 required if the auditor's term simply expires and is not renewed?

ADT-3 is specifically meant for resignation before the end of tenure. If an auditor's term ends naturally and they are not reappointed, that is generally treated differently from a mid-term resignation, so it is worth confirming with a professional which filing, if any, applies to your specific situation.

What should the company do after the auditor files ADT-3?

The company typically needs to take steps to fill the auditor vacancy within the prescribed timeline and follow its own applicable notification requirements to the ROC. It is a good idea to coordinate closely with a compliance professional to ensure both sides of the process, the auditor's ADT-3 and the company's follow-up actions, are handled correctly and on time.

Can an audit firm file ADT-3, or does it have to be an individual?

Both individual chartered accountants and audit firms can be appointed as statutory auditors, and correspondingly, both can file ADT-3 upon resignation. In the case of a firm, an authorised partner typically signs the form using their Digital Signature Certificate.

Does filing ADT-3 protect the auditor from future liability related to past audits?

Filing ADT-3 formally documents the resignation and the reasons given at the time, which is useful evidence, but it does not by itself eliminate professional responsibility for audit work performed during the auditor's tenure. Liability questions, if any arise later, are typically assessed independently based on the specific facts.

How long does it take for ADT-3 to be processed and reflected on the MCA portal?

Processing times can vary based on portal load and whether any discrepancies are flagged during review. Once submitted correctly with all supporting documents, it is generally reflected on record within a reasonable period, but auditors should track the SRN status rather than assume completion immediately after submission.

If you are an auditor navigating a resignation, or a founder whose auditor has just resigned and you are unsure what happens next, it helps to get clarity quickly rather than let deadlines slip. Legal Suvidha offers a free compliance check to help you understand exactly what needs to be filed and by when.

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