GST Registration Notice REG-3: What It Is, Why You Got It, and How to Reply

India’s GST taxpayer base crossed 1.67 crore active registrations as of June 2026 (GSTN 9 Years Report, 2026), and new businesses are added every month. But the registration process is not automatic: when a proper officer examining your Form GST REG-01 application finds a document gap or needs clarification, they issue a Form GST REG-3 notice under Rule 9(2) of the CGST Rules 2017. You then have 7 working days to reply using Form GST REG-4. Ignore it, or give an unsatisfactory reply, and the officer rejects your application in Form GST REG-5, forcing you to start over. An RTI response cited by GST practitioners revealed that over 54% of GST registration applications in some zones were rejected, often because applicants did not respond adequately to REG-3 queries. This guide covers every documented trigger, the exact reply process, and the one angle no other article covers: what CBIC’s Instruction No. 03/2025-GST prohibits officers from demanding.

What Is Form GST REG-3 and Why Did You Receive It?

Form GST REG-3 is a notice issued by a GST proper officer seeking additional information or documents from a registration applicant. It is governed by Rule 9(2) of the CGST Rules 2017, which authorises the officer to raise queries if the REG-01 application is deficient or unclear. The notice is not a rejection and carries no penalty, it is a pre-decisional step that gives you a formal opportunity to complete the record before the officer makes a grant or denial decision.

You receive REG-3 when the officer examining your application cannot grant registration on the documents already submitted. This can happen for straightforward reasons, a utility bill that is in a relative’s name without a consent letter, or for more complex reasons, such as an Aadhaar authentication failure or a PAN name mismatch flagged by the department’s risk-scoring system. The notice arrives electronically on the GST portal and generates an SMS and email alert to the registered mobile and email address on the application. Log in to gst.gov.in promptly: the 7-working-day window starts from the date of receipt, which the system marks as the date the notice appears on the portal, not the date you open it.

What Triggers a REG-3 Notice During GST Registration?

The single largest category of REG-3 triggers is address proof and Principal Place of Business (PPOB) issues, accounting for the majority of clarification notices in practice. Address documentation must precisely match the application, and any deviation causes the officer to pause. Beyond address, six other categories account for most notices.

What Is the Time Limit to Reply to a REG-3 Notice?

Rule 9(2) of the CGST Rules 2017 requires the applicant to furnish clarification, information, or documents within 7 working days of receiving the REG-3 notice. Working days exclude Sundays and gazetted public holidays as per the CGST Act. This means a notice received on a Monday gives you until the following Tuesday end-of-business to respond, assuming no public holidays in between. A notice received on a Thursday gives you until the next Friday of the following week.

Two time limits run in parallel and must not be confused. The first is your 7-working-day window to file REG-4. The second is the officer’s 7-working-day window to act on your REG-4 and either grant registration (REG-6) or reject it (REG-5). If the officer fails to act within 7 working days of receiving your REG-4, the application is deemed approved under Rule 9(5) and a registration certificate is issued automatically. This deemed approval provision is frequently missed by taxpayers who stop following up after filing their reply.

How Do You File Form REG-4 in Reply to a REG-3?

Form GST REG-4 is the formal reply to the REG-3 notice, filed on the GST portal. The reply must address every query raised in the REG-3, an incomplete reply covering only some queries is treated as an inadequate response and can result in REG-5 rejection. Here is the step-by-step process:

1. Log in to gst.gov.in using the TRN (Temporary Reference Number) or your credentials if a partial registration was already created. Navigate to Services > Registration > Application for Filing Clarifications or directly access your pending application via the ARN.
2. Read the REG-3 notice in full. Open the notice and list every specific document or clarification the officer has requested. Officers are required to list each query separately; match your response to each item individually, not as a single consolidated reply.
3. Prepare the reply. For each query, write a clear factual explanation. If the officer flagged an address mismatch, explain the nature of the arrangement (owned/rented/consent) and state which document you are attaching to resolve it. Avoid generic replies like “documents attached.”
4. Upload supporting documents. Attach each document as a separate PDF file. The portal typically accepts files up to 100 MB in total. Ensure scans are legible, blurry uploads are a common second-round REG-3 trigger. Name files clearly (e.g., “ConsentLetter_OwnerName.pdf”).
5. Submit Form REG-4. After completing all fields and attachments, submit the form. The system generates an acknowledgement. Save the acknowledgement number and note the submission timestamp: your 7-working-day deemed-approval window runs from this date.
6. Track the application status. After submitting REG-4, monitor the status under Services > Registration > Track Application Status. If status shows “Pending for Processing” beyond 7 working days from your REG-4 submission, the deemed approval provision may have been triggered. Contact your jurisdictional office with the ARN and submission timestamp to request the deemed-approval REG-06 certificate.

What Can Officers Legally Ask For, and What Are They Prohibited from Demanding?

CBIC Instruction No. 03/2025-GST (dated 17 April 2025) was issued after the department acknowledged that high rejection rates of REG-01 applications were occurring even for fully compliant businesses, due to officers making demands that had no basis in the CGST Rules. The instruction sets firm limits on what a proper officer can ask for in a REG-3 notice. This is the most important practical development in GST registration in recent years and is entirely absent from competing articles on REG-3.

What Happens After Your REG-4 Reply Is Filed?

After you submit Form REG-4, the proper officer has 7 working days to take one of three actions. Understanding all three outcomes prepares you for each scenario.

Outcome 1: Registration Granted (Form GST REG-6)

If the officer is satisfied with your clarification and documents, a Form GST REG-6 certificate is issued. This is your official GST registration certificate, containing your GSTIN (15-digit Goods and Services Tax Identification Number). The certificate is available for download on the portal under Services > User Services > View/Download Certificates. The GSTIN is active from the effective date stated in REG-6, which can be backdated to the date of liability in some cases.

Outcome 2: Deemed Approval (Automatic REG-6)

If the officer takes no action within 7 working days of receiving your REG-4 reply, registration is deemed to have been approved under Rule 9(5) of the CGST Rules, read with Section 25(12) of the CGST Act. The GST portal now automatically generates a REG-06 certificate in these cases, marked as “Deemed Approval.” If the portal does not generate the certificate automatically and you have evidence that 7 working days have elapsed, raise a grievance on the GST portal under Services > Payments > Grievance against Payment or contact the jurisdictional Commissionerate with your ARN and REG-4 submission acknowledgement.

Outcome 3: Rejection (Form GST REG-5)

If the officer is not satisfied with your reply, or if the 7-working-day REG-4 deadline was missed entirely, the officer issues Form GST REG-5 (rejection order). The order must contain written reasons for rejection. There is no direct appeal against a REG-5 within the registration process. Your options are: (a) file a fresh REG-01 application with corrected documents addressing the reasons stated in REG-5; or (b) if you believe the rejection is legally incorrect, file a writ petition before the appropriate High Court under Article 226 of the Constitution, citing the rejection as arbitrary or contrary to CBIC’s own instructions. The writ route is rare and expensive but has succeeded in cases where officers demanded documents prohibited by CBIC Instruction 03/2025-GST.

REG-3 During Amendment (Rule 19): Key Differences

If you filed Form GST REG-14 to amend your registration (for example, to change your principal place of business or add a business vertical), the officer has 15 working days from the REG-14 submission to issue a REG-3 clarification notice, under Rule 19(2) of the CGST Rules. Your reply window remains 7 working days via REG-4. If the officer does not act within 7 working days of your REG-4 reply, the certificate is deemed amended to the extent applied for under Rule 19(5). The amendment scenario follows the same logic as initial registration but with a longer initial officer-review window. For guidance on why businesses choose to amend registration versus re-register under a new structure, see our Pvt Ltd company registration guide.

For other common GST notices, our guides on GSTR-3A non-filing notices and CMP-05 composition scheme notices cover the reply process for regular and composition taxpayers respectively.

Frequently Asked Questions on GST REG-3 Notice