Procedure of Enrollment of GST

Procedure of Enrollment of GST

GST registration in India is mandatory once your aggregate turnover crosses ₹40 lakh (goods) or ₹20 lakh (services) in a financial year — lower in special-category states — or the moment you make any inter-state taxable supply, regardless of turnover. The FY 2026-27 process is entirely digital, driven by PAN and Aadhaar, and managed on the GST portal (www.gst.gov.in). For Aadhaar-authenticated applicants, registration is granted within seven working days of application. This guide walks you through every step, document, and likely rejection point.

Who Must Register for GST in FY 2026-27

The obligation to register flows from Section 22 and Section 24 of the CGST Act, 2017. The two sources of obligation are threshold-based and category-based.

Threshold-Based Mandatory Registration

Special-category states for this purpose include Mizoram, Tripura, Manipur, Nagaland, Arunachal Pradesh, Sikkim, Meghalaya, Puducherry, Uttarakhand, and Himachal Pradesh. If your registered office is in Tamil Nadu but you supply exclusively into Nagaland, you compute thresholds based on your state of registration, not the destination.

Category-Based Mandatory Registration (Section 24)

These taxpayers must register regardless of turnover:

• Persons making inter-state taxable supplies (except handicraft artisans and job-workers covered by specific notifications)
• Casual taxable persons — those supplying in a state where they have no fixed place of business
• Non-resident taxable persons supplying in India
• Persons required to deduct TDS under Section 51 (government entities, PSUs above the notified threshold)
• Persons required to collect TCS under Section 52 (e-commerce operators)
• Input Service Distributors (ISDs) — even when the parent entity is already registered
• Persons liable to pay tax under reverse charge mechanism on notified inward supplies
• E-commerce operators and persons supplying goods or services through them where tax is collectible at source

If you fall into any of these categories, the threshold is irrelevant — you register before making the first supply.

The Document Pack: What You Actually Need

Poor document preparation causes the single largest share of application rejections and queries. Assemble this before you open the portal.

Identity and constitution documents:

• PAN card of the business entity (PAN is the anchor — name on PAN must match the legal name in REG-01 exactly)
• Aadhaar of all promoters / partners / directors required for authentication
• For companies: Certificate of Incorporation from MCA V3
• For LLPs: LLP Agreement and Certificate of Registration from the Registrar of LLPs
• For partnerships: Registered partnership deed (unregistered deed is accepted but creates audit risk)
• For trusts and societies: Registration certificate and trust deed

Proof of principal place of business:

• If owned: electricity bill or municipal property tax receipt not older than two months, plus ownership document
• If rented/leased: rent or lease agreement plus utility bill in the landlord's name — both are required; a rent agreement alone is routinely flagged
• If in a co-working space or shared premises: consent letter/NOC from the owner with their identity proof and their utility bill

Bank account proof:

• Cancelled cheque leaf with pre-printed account number and name, or
• Bank statement / passbook front page (first page showing name, account number, IFSC)
• A blank cheque or a photocopy of just the IFSC will be rejected

Authorisation for signatory:

• For a company: Board Resolution specifically naming the authorised signatory
• For an LLP: Consent letter from all designated partners naming the authorised signatory
• For a partnership: Letter of authorisation signed by all partners
• For a proprietary business: No separate authorisation needed — the proprietor signs everything

Digital Signature Certificate (DSC):

• Mandatory for private and public limited companies and LLPs
• Individual proprietors and partners can use Electronic Verification Code (EVC) instead

Scan all documents at a minimum 100 DPI in PDF or JPEG. File size per document must not exceed 1 MB. Blurry photographs and cut-off documents are a leading cause of the portal rejecting the upload.

Step-by-Step: Filing Form GST REG-01

The application for new registration under Rule 8 of the CGST Rules, 2017 is filed in two parts.

Part A — Generate TRN

1. Go to www.gst.gov.in → Services → Registration → New Registration
2. Select Taxpayer as the type of taxpayer (or select the relevant category — TDS deductor, TCS collector, NRTP, etc.)
3. Enter your state and district
4. Enter the legal name of the business exactly as it appears on PAN
5. Enter PAN — the system validates it against CBDT's PAN database in real time; a mismatch blocks progress
6. Enter the business email address and mobile number of the authorised signatory
7. Both email and mobile receive a six-digit OTP; enter both to verify
8. A Temporary Reference Number (TRN) is generated and sent via email; it is valid for 15 days

Part B — Complete the Application

1. Return to the portal, select Temporary Reference Number (TRN) login, enter the TRN and the OTP sent to your registered mobile
2. Form GST REG-01 Part B opens — it has ten tabs:

1. After completing all tabs, proceed to Aadhaar authentication (detailed in the next section)
2. Submit the application using DSC (companies/LLPs) or EVC (individuals/partnerships)
3. An Application Reference Number (ARN) is generated — save this; it is your tracking number

From ARN generation, the proper officer has seven working days to approve or issue a notice if the applicant has completed Aadhaar authentication. If no authentication was done or biometric verification is flagged, the officer has 30 working days and may order a physical inspection of the premises.

Aadhaar Authentication — The Critical Step Most Applications Trip Over

Section 25(6B) of the CGST Act, inserted by the Finance Act 2020, made Aadhaar authentication an integral part of new GST registration. Under Rule 8(4A) and related notifications, the applicant receives an authentication link on their Aadhaar-linked mobile number. Here is how it works in practice and where it breaks down.

For a Proprietorship: The proprietor authenticates using Aadhaar OTP. If the name on Aadhaar differs from the name on PAN — even by a single letter or the presence/absence of a middle name — the system flags a demographic mismatch and the application is escalated for biometric authentication at a GST Suvidha Kendra (GSK).

For a Partnership: All partners listed in the application must complete authentication, or at minimum the authorised signatory and the partner who signed Part A. If even one partner fails OTP authentication, the GSK route applies.

For a Company or LLP: The Managing Director (or any one director if no MD is designated) plus the authorised signatory must authenticate. DSC is additionally required for submission.

Biometric authentication at GSK: This involves visiting the designated facilitation centre in your jurisdiction with the original Aadhaar card and being physically verified. It adds 10–15 days to the registration timeline. To avoid this route: ensure the name on your Aadhaar exactly matches the name as it should appear in the application, update your Aadhaar demographic data on the UIDAI portal before applying if there is any mismatch, and ensure your Aadhaar-linked mobile number is active.

After successful biometric verification, the officer completes physical inspection within 30 working days and the registration certificate in Form GST REG-06 is issued if everything is in order.

Casual Taxable Persons and Non-Resident Taxable Persons

These two categories follow a fundamentally different enrolment path under Section 27 of the CGST Act.

Casual Taxable Person (CTP): A person who supplies goods or services in a state where they have no fixed place of business — for example, a manufacturer from Maharashtra who participates in a trade fair in Delhi for three weeks.

• Must apply at least five days before commencing supply
• The application is the same Form GST REG-01, but with the CTP category selected
• Must deposit estimated advance tax for the registration period at the time of application
• Registration is valid for 90 days from the effective date; extendable by a further 90 days by filing Form GST REG-11 with an additional deposit

Non-Resident Taxable Person (NRTP): A foreign supplier making taxable supplies in India — for example, an overseas exhibitor at an Indian trade show, or a foreign artist performing in India.

• Must apply at least five days in advance
• Files in Form GST REG-09, not REG-01
• Advance tax deposit is mandatory
• Must appoint an authorised person in India for compliance
• Registration is valid for 90 days, extendable for 90 more

Worked Example: Advance Tax Deposit for a Casual Taxable Person

Scenario: A handicraft exporter from Jaipur, Rajasthan participates in a crafts fair in Mumbai, Maharashtra for 45 days in FY 2026-27. The stall owner estimates:

• Estimated sales at the fair: ₹12,00,000
• Applicable GST rate on handicrafts: 12% (6% CGST + 6% SGST/IGST)

Since this is an inter-state supply from Rajasthan to consumers in Maharashtra, the applicable tax is IGST at 12%.

Estimated tax liability = ₹12,00,000 × 12% = ₹1,44,000

This ₹1,44,000 must be deposited via Form GST PMT-06 into the Electronic Cash Ledger at the time of filing the CTP registration application — before a single item is sold at the fair. The GSTIN is granted for the state of Maharashtra (not Rajasthan, where the applicant's regular GSTIN exists).

If actual sales exceed the estimate, a further advance must be deposited before filing returns. If actual sales fall short, the excess sits in the Electronic Cash Ledger and is refunded after filing the final return — typically within 60 days if the application is processed cleanly.

Consequence of not registering: Supplying without registration in this scenario triggers a penalty under Section 122 of the CGST Act of ₹10,000 or the amount of tax evaded, whichever is higher — in this case ₹1,44,000. That is a penalty larger than the entire tax liability, simply for skipping the registration step.

Multi-State Operations and Separate Registrations

One PAN, multiple states — each state demands its own GSTIN. A company registered in Karnataka with a warehouse in Gujarat and a sales office in West Bengal requires three separate GSTINs, each obtained through an individual REG-01 filing for that state.

The GSTIN structure itself encodes this: the first two digits are the state code (e.g., 29 for Karnataka, 24 for Gujarat, 19 for West Bengal), followed by the 10-digit PAN, a one-digit entity number, the letter Z, and a check digit.

Intra-state multiple verticals: Under Rule 11, a business with distinct business verticals in the same state may optionally obtain separate registrations for each vertical. Once separate registrations are obtained, inter-unit transfers between those registrations are taxable supplies — tax invoices and e-way bills are required, and ITC flows through normal channels. This structure can be operationally clean for large conglomerates but adds compliance overhead for smaller businesses; model the trade-off before opting in.

Cross-charge for common services: When a head office in Delhi provides IT, HR, and legal support to branches in other states, those services must be cross-charged — invoiced at cost with applicable GST — to each branch GSTIN. Failure to cross-charge is a recurring issue flagged in departmental audits and GST scrutiny notices under Section 65 and 66.

Common Mistakes and Pitfalls to Avoid

1. Name mismatch between PAN and application: The PAN database pulls the legal name in a specific format. Entering even a punctuation difference — "Pvt. Ltd." versus "Private Limited" — triggers a mismatch. Check the PAN card and MCA master data before typing.

2. Rent agreement without a utility bill: A rent agreement alone does not constitute valid address proof for rented premises. Always pair it with an electricity or water bill in the landlord's name.

3. Expired or undated authorisation letters: Board resolutions and partner authorisations must be dated; an undated document is routinely rejected. Companies must also ensure the resolution was passed before the date of application.

4. Selecting the wrong business activity code: The Nature of Business field and the HSN/SAC codes in Tab 7 must accurately reflect your actual supply. Registering as a "trader" when you are a manufacturer, or entering a generic HSN when a specific one exists, creates downstream problems in e-invoice and e-way bill generation.

5. Wrong turnover period for compulsory registration: Turnover for the threshold is computed on an aggregate all-India basis across all branches and business verticals under the same PAN, not state-by-state. A company with ₹15 lakh turnover in each of three states has aggregate turnover of ₹45 lakh and is compulsorily registerable.

6. Missing the five-day advance registration window for CTPs: Operating as a casual taxable person for even a single day without prior registration exposes you to the Section 122 penalty. Calendar the application filing for at least a week before the event.

7. Treating Aadhaar authentication as optional: Some applicants defer the Aadhaar link step, not realising it shifts their application from a 7-day digital track to a 30-day physical verification track. Complete Aadhaar authentication in the same session as your Part B submission.

Post-Registration: Your Compliance Calendar Starts Now

Form GST REG-06 is not the end — it is the starting gun. From the effective date of registration, the following obligations are live:

• Display GSTIN at the principal place of business and all additional places of business — a visible notice board is required
• Issue GST-compliant tax invoices with all mandatory fields under Section 31 read with Rule 46
• File GSTR-1 (outward supplies) — monthly if turnover exceeds ₹5 crore; quarterly under QRMP if below ₹5 crore
• File GSTR-3B (consolidated return) — monthly or quarterly to match your GSTR-1 frequency
• Generate e-invoices if your aggregate turnover in the preceding financial year exceeded ₹5 crore — mandatory under Rule 48(4)
• Generate e-way bills for every consignment of goods exceeding ₹50,000 in value moving beyond 50 km or crossing a state border
• Annual return in GSTR-9 — due by 31 December following the close of the financial year (31 December 2027 for FY 2026-27)
• Reconciliation statement GSTR-9C (self-certified) if turnover exceeds ₹5 crore

Late fees for non-filing accumulate at ₹50 per day (₹25 CGST + ₹25 SGST) for taxpayers with tax liability, and ₹20 per day for nil-return filers, subject to the maximum as notified for each return type.

Voluntary Registration: Run the Numbers First

Registering voluntarily below the threshold gives you the right to issue tax invoices and claim Input Tax Credit on purchases. It also allows you to supply to GST-registered buyers who need a tax invoice to claim their own ITC — important when selling B2B. Exporters benefit because zero-rated exports require a GSTIN.

The cost side: you are now committed to filing GSTR-1 and GSTR-3B every month or quarter for as long as the registration is active — even in months with zero turnover. Filing a nil return is simple, but not filing at all triggers late fees that compound quickly. If you later want to cancel, the cancellation process under Form GST REG-16 can take 30 days and requires all pending returns to be filed first.

For a freelancer billing ₹18 lakh annually to corporate clients, voluntary registration makes sense — the clients can claim ITC and you may win contracts you would otherwise lose to GST-registered competitors. For a local grocery retailer selling exclusively to end consumers at ₹18 lakh per year, the compliance cost almost certainly outweighs the benefit.

Amending Your Registration After Grant

Business details change. The GST registration must track those changes through Form GST REG-14, filed within 15 days of the change occurring.

Core field amendments (require officer approval within 15 working days):

• Legal name of the business (PAN change requires fresh registration, not amendment)
• Addition or deletion of business places
• Addition or deletion of partners / directors
• Change in nature of business activities

Non-core field amendments (auto-approved immediately):

• Trade name
• Contact details of authorised signatory (email and mobile)
• HSN/SAC codes for goods and services
• Additional business verticals within an existing registration

Bank account changes are handled separately — update directly in the registration profile on the portal; no REG-14 is required, though the system sends a confirmation to the registered email and mobile.

Failure to update within 15 days of a change — say, a partnership admitting a new partner — is technically a contravention under Section 122, exposing you to a ₹10,000 penalty. In practice, departmental action on amendment delays is limited, but the mismatch between your GST registration and your other filings (income tax return, ROC, MCA) creates reconciliation headaches during scrutiny.

Key Takeaways

• Threshold check first: Aggregate all-India turnover under the same PAN determines mandatory registration — not state-level or branch-level turnover alone.
• Casual and non-resident taxpayers must apply at least five days before the first supply and deposit estimated advance tax; failure makes every rupee of supply a penalty risk.
• Aadhaar authentication within the same session as Part B submission keeps you on the seven-working-day approval track; deferring it shifts you to 30-day physical verification.
• Document pairing is mandatory: A rent agreement must be paired with a utility bill in the landlord's name; either document alone is insufficient.
• Multi-state operations need separate GSTINs — one per state — and inter-unit transfers between separate registrations are taxable supplies requiring invoices and e-way bills.
• Registration is Day 1 of a compliance cycle: GSTR-1, GSTR-3B, e-invoicing, e-way bills, and eventually GSTR-9 begin from the effective date of REG-06.
• Voluntary registration is a business decision, not just a tax one — model the recurring compliance cost against the ITC and commercial benefits before opting in.