GST Registration in India — Who Must Register, Documents Required, and the GSTIN Process

GST Registration in India

Goods and Services Tax (GST) registration is the mandatory first step for every business in India whose taxable turnover crosses the prescribed threshold, or whose nature of supply requires registration regardless of turnover. A GST registration certificate and a 15-digit GSTIN (GST Identification Number) are the entry tickets to the GST ecosystem: without registration, a business cannot legally charge GST on its supplies, cannot claim the Input Tax Credit (ITC) that reduces its tax burden on purchases, cannot issue a valid tax invoice, and cannot supply goods or services to registered businesses that demand a tax invoice.

The GST registration framework operates under two parallel provisions: Section 22 of the CGST Act, 2017 provides the threshold-based registration requirement — every supplier whose aggregate turnover in a financial year exceeds the prescribed threshold must register; and Section 24 provides for compulsory registration irrespective of turnover. N D Savla & Associates, Chartered Accountants based in Mumbai, handles GST registration for all categories of entities: individuals, sole proprietors, partnership firms, LLPs, private limited companies, public limited companies, trusts, NGOs, and government entities.

GST registration is not merely a legal formality — it is the foundation of the client's entire GST compliance architecture. Every GST return filed, every invoice issued, every ITC claimed, and every refund applied for requires a valid GSTIN. This guide covers the complete GST registration framework; for any recent amendments or portal updates, always verify current requirements on the GST portal at gst.gov.in.

What Is GST and Why Does Registration Matter?

GST is India's comprehensive indirect tax that replaced a multiplicity of central and state indirect taxes from 1 July 2017. GST is comprehensive (applies to almost all goods and services), multi-stage (levied at every stage of value addition), destination-based (revenue accrues to the consuming state), and operates through an Input Tax Credit (ITC) mechanism that eliminates the cascading effect of the pre-GST tax system.

GST registration is the gateway to the ITC mechanism. Without registration, a business pays GST on all its purchases but cannot claim any ITC, making its effective tax cost higher than that of a registered competitor. For B2B businesses, not being GST-registered also makes the business commercially less competitive — registered buyers typically demand tax invoices so they can claim ITC, which an unregistered supplier cannot issue.

Who Must Register for GST?

Threshold-Based Registration — Section 22

Section 22 of the CGST Act, 2017 requires every supplier to register if their aggregate turnover in a financial year exceeds the prescribed threshold. The threshold varies by supply type and state:

Special category states with lower thresholds include Arunachal Pradesh, Assam, Jammu & Kashmir, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim, Tripura, Himachal Pradesh, and Uttarakhand. Always verify the current threshold list on the GST portal.

Compulsory Registration — Section 24 (Irrespective of Turnover)

Section 24 mandates registration for the following categories regardless of aggregate turnover:

• Inter-State suppliers — Any person making inter-state taxable supplies must register, even if their aggregate turnover is below the threshold.
• Casual Taxable Persons — Persons who occasionally supply in a state where they have no fixed place of business.
• Non-Resident Taxable Persons — Foreign persons who supply goods or services in India without a fixed place of business.
• Persons liable under Reverse Charge Mechanism (RCM) — Where the recipient is liable to pay GST instead of the supplier.
• Electronic Commerce Operators (ECO) — E-commerce platforms required to collect TCS under Section 52.
• Persons supplying through e-commerce operators — Even if their turnover is below the threshold.
• Input Service Distributors (ISD) — Companies that receive invoices for services used by multiple branches and distribute ITC to those branches.
• OIDAR service providers — Online information and database access providers supplying to non-taxable persons in India from outside India.
• Persons required to deduct TDS under GST (Section 51) — Government departments, local authorities, and specified PSUs.

Voluntary GST Registration

A person whose aggregate turnover is below the mandatory threshold can voluntarily register under Section 25(3) of the CGST Act. Benefits include claiming ITC on purchases, issuing valid GST tax invoices, demonstrating compliance to banks and investors, participating in government tenders, and enabling inter-state supply of goods.

Aggregate Turnover — What Counts and What Doesn't

The term "aggregate turnover" for GST registration threshold purposes is defined in Section 2(6) of the CGST Act as the aggregate value of all taxable supplies (excluding RCM inward supplies), exempt supplies, exports of goods or services, and inter-state supplies of the same PAN-linked entities, computed on an all-India basis — but excluding: GST taxes themselves; the value of inward supplies taxable under Reverse Charge; and the value of transactions that are neither a supply of goods nor services under Schedule III.

Documents Required for GST Registration — By Entity Type

Address proof — what is acceptable: For own property: municipal tax receipt or electricity bill (not more than 2 months old) in the owner's name. For rented/leased property: rent agreement + NOC from property owner + utility bill in owner's name. For consent-based occupation: consent letter from property owner + utility bill in owner's name + owner's identity proof.

Types of GST Registration

Regular GST Registration — The Standard Route

Under regular registration, all taxable supplies are subject to GST at the applicable rate; ITC is available on all eligible purchases; valid tax invoices must be issued for every taxable supply; monthly/quarterly GSTR-1 and GSTR-3B returns must be filed; and an annual GSTR-9 return must be filed.

Composition Scheme — Section 10 (For Small Businesses)

The Composition Scheme is a simplified GST compliance option for small businesses with aggregate turnover not exceeding Rs. 1.5 crore (Rs. 75 lakh for special category states) for goods suppliers. A separate composition scheme at 6% is available for service providers with turnover up to Rs. 50 lakh. Key features: tax paid at a fixed rate on turnover; ITC is NOT available; tax invoices CANNOT be issued; inter-state supply is NOT permitted; quarterly GSTR-4 return and annual GSTR-9A return are filed.

The GST Registration Process — Step by Step

1. Gather All Documents — Compile all entity-specific documents (PAN, Aadhaar, address proof, entity documents). Ensure address proof is current (within 2 months) and clearly shows entitlement to use the premises for business.
2. Visit the GST Portal at gst.gov.in — Navigate to Services > Registration > New Registration. Click on "New Registration" and select the appropriate taxpayer type from the dropdown (Regular Taxpayer, Composition, ISD, etc.).
3. Complete Form GST REG-01 — Part A and Part B — Part A captures the PAN, mobile number, email address, and state. An OTP is sent for verification. Part B captures detailed business information: legal name, trade name, principal place of business, additional places of business, nature of business, HSN/SAC codes, bank account details, and documents upload.
4. Complete Aadhaar Authentication — After submitting the application, an Aadhaar authentication link is sent to the registered mobile/email. Complete Aadhaar OTP authentication within the timeframe given. This is the most important step for fast-track processing: authenticated applications are processed within 3 working days.
5. Upload Supporting Documents — All required documents (address proof, entity documents, bank proof, photographs) must be uploaded in the specified format and size.
6. Application Review by GST Officer (Where Required) — Applications without Aadhaar authentication are assigned to a GST officer for review. The officer may issue Form GST REG-03 (Notice of Deficiency) requiring additional information, to which the applicant must respond in Form GST REG-04 within 7 working days.
7. GSTIN Issued — Download Registration Certificate — Once approved, the GSTIN is allotted and Form GST REG-06 (Registration Certificate) is available for download from the GST portal. The GSTIN is active and ready for use on invoices and returns immediately upon issue.

GSTIN — Understanding Your 15-Digit GST Identification Number

The GSTIN (Goods and Services Tax Identification Number) is a unique 15-character alphanumeric identifier assigned to every GST-registered entity. The format: [State Code (2 digits)] + [PAN of Entity (10 characters)] + [Entity Number (2 alphanumeric)] + [Z] + [Check Digit (1 character)]

• A business with the SAME PAN registering in MULTIPLE states gets a DIFFERENT GSTIN for each state — but all GSTINs share the same PAN digits in positions 3–12.
• The GSTIN must appear on every tax invoice, debit note, credit note, GST return, and official GST correspondence.
• Before accepting a vendor's invoice, always verify the vendor's GSTIN on the GST portal — invalid or cancelled GSTIN invoices do not support ITC claims.

Timeline — How Long Does GST Registration Take?

• With Aadhaar authentication completed: Typically granted within 3 working days of the application date, provided no other proceedings are pending and the application is complete. This is the fastest route and is strongly recommended.
• Without Aadhaar authentication: Application is assigned to a GST officer for verification. The officer has 30 days to process. Physical inspection of the business premises may be required. Total timeline can be 15–45 days.
• Deficiency noticed by officer: If deficient, the officer issues Form GST REG-03 (Notice of Deficiency). The applicant must respond in Form GST REG-04 within 7 working days. If the response is satisfactory, registration is granted; otherwise, the application is rejected in Form GST REG-05 with reasons.

Why Choose N D Savla & Associates for GST Registration?

GST registration requires getting multiple technical details right on the first attempt: entity classification, correct HSN/SAC codes, accurate business classification, valid address proof, Aadhaar authentication, and complete document compilation. An incomplete or incorrect application results in deficiency notices, delays, and in some cases rejection. N D Savla & Associates has handled GST registrations for all entity types since GST's introduction in 2017.

• End-to-End Registration Management. We manage the complete registration process: pre-registration consultation, document compilation and verification, Form GST REG-01 preparation and filing, Aadhaar authentication co-ordination for faster processing, monitoring the application status, responding to GST officer notices, and downloading the final GSTIN certificate.
• HSN/SAC Code and Business Classification Advisory. Selecting the correct HSN code for goods and SAC for services at the time of registration is critical — these codes determine the GST rate applicable and the return format for reporting. We advise on the correct codes for the client's specific products and services.
• Post-Registration Compliance Setup. After the GSTIN is allotted, we set up the client's complete GST compliance calendar: GSTR-1 due dates, GSTR-3B due dates, ITC eligibility assessment, invoice format requirements, and the e-invoicing threshold check.

Frequently Asked Questions About GST Registration