Applying for GST registration is easy; getting it approved is where many Mumbai businesses get stuck. The usual reason is a clarification notice in Form GST REG-03, often about the address proof of the business premises. Miss the reply deadline or answer it badly, and the application is rejected. This guide explains the timelines and how to reply. For the basic process, see GST registration: when it is compulsory and how to apply.
The timelines that matter
| Stage | Time limit (CGST Rules) |
|---|---|
| Aadhaar authentication after submitting Part B of REG-01 | 15 days |
| Officer’s decision where Aadhaar authentication succeeded | 7 working days; if the officer does nothing, the registration is deemed approved |
| Where Aadhaar authentication is not done, or the application is flagged for risk | Up to 30 days, with physical verification of the premises |
| Your reply to a REG-03 notice, in Form REG-04 | 7 working days from the notice |
| Officer’s decision on your reply | 7 working days from the reply |
Applicants selected on risk parameters may be asked to book an appointment at a GST Suvidha Kendra for biometric Aadhaar authentication and document verification within the time given. Missing it holds up the application. A simplified registration route for small businesses also exists under Rule 14A; check whether you qualify.
Common REG-03 objections for Mumbai premises
| Objection | Typical cause | How to answer |
|---|---|---|
| Address proof not in the applicant’s name | Rented office, shop or gala | Upload the registered leave and licence agreement and the owner’s latest electricity bill or property tax receipt, with the owner’s consent letter and identity proof |
| Consent letter not acceptable | Unsigned, no owner ID, or address mismatch | A fresh consent letter on the owner’s letterhead or plain paper, signed, with ID proof, stating the exact address as on the bill |
| Business run from home | Flat in a family member’s name | Consent letter from the owner (spouse, parent) with the electricity bill or property tax receipt, and a note on the nature of business at home |
| Chawl, SRA or old tenanted room | No electricity bill in the owner’s name, or rent receipts only | Rent receipts, the landlord’s or society’s letter, the electricity bill in whatever name it stands, with an explanation; take advice where documents are thin |
| Address on documents differs from the application | Wing, floor, gala or plot number missing | Explain the variation and upload documents showing the full address; consistency matters |
| Business activity unclear | Vague description or wrong HSN/SAC codes | Describe the business plainly and correct the codes where the portal allows |
| Premises found closed or unverifiable on inspection | No signboard, no one present | Ensure a signboard with the business name and someone present; offer a re-verification time in the reply |
Drafting the REG-04 reply
- Read the notice word by word and list each point raised.
- Answer point by point, briefly, numbered to match the notice.
- Attach only relevant, legible documents, named clearly (“Leave_and_Licence_registered.pdf”). Blurry phone photos are a common cause of rejection.
- Where the portal allows amendments to the application in response to the query, correct the errors rather than only explaining them.
- File within 7 working days. Silence is treated as failure to reply.
- Keep a copy of the filed reply and the acknowledgement.
If the application is rejected (REG-05)
- Read the reason given. If the rejection is plainly wrong, an appeal lies to the Appellate Authority within the time allowed.
- Often it is faster to file a fresh, corrected application with the right documents.
- Do not start trading as a registered person or collect GST before you have a GSTIN.
Prevent the query in the first place
- Register your leave and licence agreement (it is compulsory in Maharashtra) before applying.
- Complete Aadhaar authentication when the portal asks; it moves your application to the 7-working-day track.
- Make sure the names and dates of birth on PAN and Aadhaar match exactly.
- Put up a signboard at the premises; officers may visit.
- If you also need a Shop Act (Gumasta) licence or Udyam registration, see Gumasta vs Udyam.
Frequently asked questions
How long does GST registration take in Mumbai?
About 7 working days where Aadhaar authentication succeeds and nothing is flagged; up to 30 days where physical verification is ordered; longer if a query is raised.
Can I use my home address for GST registration?
Yes, if the business genuinely operates from there and you have the owner’s consent and address proof.
My registration was cancelled later. Is it the same process?
No. Cancellation and revocation have their own process. See GST show cause notices and revocation.
See also: GST registration and leave and licence registration.
Consultations are by appointment. To fix a time, telephone +91 99301 50560 or send a message on WhatsApp.
This guide describes the GST registration rules as understood in October 2026. It is not tax or legal advice; portal procedures and notifications change frequently.