· 10 min read
By Correct Editorial — Compliance Research Desk
GST Registration: Step-by-Step Guide for Businesses
Published on: July 29, 2026
India's Goods and Services Tax has matured into one of the largest indirect tax networks in the world, with over 1.5 crore active registrations and gross collections crossing Rs 22 lakh crore in FY 2024-25. Registration is the entry point to that system. Without a valid GSTIN, a business cannot lawfully collect GST, issue a tax invoice under Section 31 of the CGST Act, 2017, or pass on input tax credit to its customers.
Registration has also become considerably harder to treat as a formality. Aadhaar authentication, biometric verification at GST Suvidha Kendras, data-analytics-driven risk scoring, and physical verification of premises now sit between an application and an approved GSTIN. The GST Network has publicly attributed a large share of registration rejections to mismatched or unreadable address proofs and unverifiable principal places of business.
At the same time, the GST 2.0 reforms effective 22 September 2025 rationalised rates into a two-slab structure and pushed compliance further towards real-time reporting. For any business scaling into new states, onboarding marketplace channels, or preparing for diligence, a clean registration trail is now foundational. This guide sets out who must register, what is required, how the process runs on the portal, what happens if you get it wrong, and how to build controls that keep registrations audit-ready.
Who Must Register Under GST?
Registration is mandatory for every supplier whose aggregate turnover exceeds the prescribed threshold in a financial year under Section 22 of the CGST Act, and for every person covered by the compulsory categories in Section 24, regardless of turnover. Liability arises in the state or union territory from which the taxable supply is made.
The population of registrable persons therefore includes:
- Traders, manufacturers, and service providers crossing the turnover threshold in any state
- Inter-state suppliers of goods, from the first rupee of supply
- E-commerce operators and most sellers supplying through marketplaces
- Casual taxable persons exhibiting at trade fairs or executing short-term projects outside their home state
- Non-resident taxable persons and overseas suppliers of OIDAR services to Indian recipients
- Input Service Distributors (ISD) — mandatory since the ISD mechanism became compulsory for distributing common input services
- Persons liable to pay tax under reverse charge, and those required to deduct tax under Section 51 or collect tax under Section 52
- Agents supplying on behalf of a principal, and persons supplying on behalf of another taxable person
Aggregate turnover is computed PAN-India, across all states, and includes taxable, exempt, export, and inter-state supplies. It excludes GST itself and inward supplies attracting reverse charge. A business with Rs 18 lakh of taxable turnover in Maharashtra and Rs 9 lakh in Gujarat has crossed the Rs 20 lakh services threshold and must register in both states from which it supplies.
What Are the Registration Thresholds in 2026?
For most states, the threshold is Rs 40 lakh for businesses exclusively supplying goods and Rs 20 lakh for service providers or mixed suppliers. In special category states, the limits fall to Rs 20 lakh and Rs 10 lakh respectively. These limits do not override the compulsory registration triggers in Section 24.
| Category of supplier | Normal states | Special category states |
|---|---|---|
| Exclusive supply of goods | Rs 40 lakh | Rs 20 lakh |
| Supply of services, or goods and services | Rs 20 lakh | Rs 10 lakh |
| Compulsory categories under Section 24 | No threshold | No threshold |
Two practical cautions apply. First, the higher Rs 40 lakh limit is unavailable to persons making inter-state supplies of goods, to those liable under Section 24, and to suppliers of specified goods such as pan masala, tobacco, ice cream, and certain bricks. Second, a business eligible for the composition scheme under Section 10 — turnover up to Rs 1.5 crore for goods, Rs 50 lakh for the services composition option — must still register before opting in through Form GST CMP-02.
What Documents Do You Need Before You Apply?
A complete document set is the single biggest determinant of first-time approval. The portal requires proof of constitution, identity of promoters and the authorised signatory, proof of principal place of business, and bank account evidence, uploaded within prescribed file-size limits and in legible form.
Prepare the following before starting:
- PAN of the business entity and of every promoter, partner, or director
- Constitution proof — certificate of incorporation, partnership deed, LLP agreement, trust deed, or registration certificate
- Identity and address proof of promoters and the authorised signatory (Aadhaar and PAN, plus passport-size photographs)
- Board resolution or authorisation letter appointing the authorised signatory, in Form GST REG-01 format
- Proof of principal place of business — latest electricity bill, municipal khata, property tax receipt, ownership deed, or registered rent or lease agreement with the lessor's ownership proof and a no-objection certificate where premises are shared
- Bank account details — cancelled cheque, bank statement, or first page of the passbook, uploadable within thirty days of registration if not available at filing
- Digital signature certificate (DSC) for companies and LLPs, since EVC is not permitted for these constitutions
Where the applicant proposes to operate from multiple locations in the same state, each site must be listed as an additional place of business. Warehouses used for marketplace fulfilment are a frequent source of notices when they are omitted.
How Do You Register: The Step-by-Step Process
Registration runs entirely on the GST portal through Form GST REG-01 under Rule 8 of the CGST Rules, 2017, in two parts. Part A validates PAN, mobile number, and email to generate a Temporary Reference Number (TRN); Part B captures business details and documents and produces an Application Reference Number (ARN) on submission.
- Initiate Part A. On the GST portal, select New Registration, choose taxpayer type and state, and enter legal name as per PAN, PAN, email, and mobile. OTP verification of email and mobile issues the TRN, valid for fifteen days.
- Complete Part B. Using the TRN, populate business details, promoter and partner information, authorised signatory, authorised representative, principal and additional places of business, goods and services with HSN or SAC codes, and bank details.
- Upload documents. Attach constitution, address, identity, and bank proofs in the prescribed formats. Ensure the address on the proof matches the address keyed into the form exactly, including floor and unit numbers.
- Complete Aadhaar authentication. Promoters and the authorised signatory authenticate via OTP under Rule 8(4A). Where authentication is not opted for or fails, the application moves to mandatory physical verification.
- Attend biometric verification where flagged. In states where biometric-based Aadhaar authentication is notified, the applicant receives a link to book a slot at a GST Suvidha Kendra for photograph capture and document verification.
- Verify and submit. Sign with DSC, e-signature, or EVC as applicable and note the ARN for tracking.
- Respond to queries. If the officer issues Form GST REG-03 seeking clarification, respond in Form GST REG-04 within seven working days. Non-response leads to rejection in Form GST REG-05.
- Download the certificate. On approval, Form GST REG-06 with the fifteen-digit GSTIN is available on the portal dashboard.
The GSTIN structure is worth understanding for reconciliation: the first two digits are the state code, the next ten the PAN, the thirteenth the entity number within the state, the fourteenth a default letter, and the fifteenth a checksum.
How Long Does Approval Take, and What Triggers Verification?
Where Aadhaar authentication is successful and the application is not flagged by risk analytics, registration is generally granted within seven working days. Applications that are flagged, or where authentication is incomplete, are routed to physical verification of the premises under Rule 25, and approval can extend to roughly thirty days from application.
Common triggers for deeper scrutiny include:
- Address proof that is illegible, in a third party's name without an NOC, or inconsistent with the address entered
- Residential or co-working premises with no visible business signage or supporting documentation
- Promoters linked to GSTINs previously cancelled for non-compliance or suspected fake invoicing
- A declared line of business that is inconsistent with the premises or with the HSN codes selected
The effective date of registration follows Section 25(2) and Rule 10: where the application is filed within thirty days of becoming liable, registration is effective from the date liability arose, preserving the ability to claim credit on stock held under Section 18(1)(a) through Form GST ITC-01. Filing late means the effective date is the date of grant, and pre-registration credit is lost.
What Are the Penalties for Failing to Register?
Section 122(1) of the CGST Act prescribes a penalty of Rs 10,000 or the tax evaded, whichever is higher, for a person who supplies goods or services without registration when liable to do so. The officer may additionally proceed under Section 63 to assess unregistered periods on a best-judgement basis, with interest at 18 percent under Section 50.
The commercial consequences usually exceed the statutory penalty:
- The business cannot issue a tax invoice, so customers lose input tax credit and often withhold payment or renegotiate price
- Credit on inputs and capital goods for the unregistered period is generally unavailable, becoming a permanent cost
- Marketplaces and enterprise procurement portals suspend vendor accounts without a valid GSTIN
- Where evasion exceeds prescribed limits, Section 132 prosecution provisions can be invoked in serious cases involving fake invoicing
- Diligence in fundraising or M&A routinely surfaces unregistered state operations as an indemnity item
Post-registration hygiene matters just as much. Registration can be suspended and cancelled under Section 29 for continuous non-filing of returns, and cancellation carries its own consequences, including reversal obligations and a Form GSTR-10 final return.
Special Cases Finance Teams Get Wrong
Certain categories carry bespoke rules that standard registration checklists miss. Casual and non-resident taxable persons must pay an advance deposit of estimated tax and receive registration valid for ninety days, extendable once. E-commerce and cross-border digital businesses have their own mechanisms.
- Casual taxable person: apply at least five days before commencing business; registration is time-bound and requires advance tax deposit
- Non-resident taxable person: apply in Form GST REG-09 at least five days before commencement, with a valid passport and tax identification number of the home jurisdiction
- E-commerce sellers: operators must register under Section 24 and collect TCS under Section 52; small suppliers using marketplaces have been given simplified registration pathways following the 56th GST Council recommendations
- OIDAR suppliers: overseas providers of digital services to Indian recipients register in Form GST REG-10 and file Form GSTR-5A
- Input Service Distributor: a separate ISD registration is now compulsory for distributing common input service credit across GSTINs
- SEZ units and developers: require a separate registration distinct from a domestic tariff area unit in the same state
Practical Recommendations
Treat registration as a controlled process with named owners, evidence retention, and periodic review rather than a one-time filing. The following controls consistently reduce rejection rates and downstream notices.
- Run a state-wise nexus assessment every quarter. Track where inventory sits, where employees deliver services, and where warehouses or fulfilment centres are used, and register before supplies commence rather than after.
- Pre-validate address proof against the form. Match the door number, floor, building name, and PIN code exactly. Where premises are shared or rented, attach the lease, the lessor's ownership proof, and an NOC together.
- Complete Aadhaar authentication for all promoters immediately. Skipping it guarantees physical verification and materially extends timelines.
- Maintain a central GSTIN register. Record GSTIN, effective date, state, place-of-business list, authorised signatory, DSC expiry, and filing status for every registration.
- Amend before you are asked. Use Form GST REG-14 promptly for changes in address, authorised signatory, or business constitution; stale particulars are a common trigger for suspension.
- File the first returns on time. Registration approval is not the finish line — sequencing rules mean a missed early return blocks subsequent filings. See GSTR-1 vs GSTR-3B: Key Differences Explained for the filing calendar.
- Align systems from day one. Confirm whether the entity crosses the e-invoicing threshold, as covered in E-invoicing under GST: Everything You Need to Know, and configure invoicing masters and HSN codes before the first outward supply.
- Protect early credit. File Form GST ITC-01 within thirty days of registration becoming effective to claim credit on stock held, and review eligibility against Input Tax Credit (ITC): Rules and Best Practices.
References
- GST Portal — Registration services — Application filing, tracking, and amendment workflows
- GST Portal — Registration user manual — Screen-by-screen guidance for REG-01 and related forms
- CBIC-GST — Acts and Rules — Text of the CGST Act, 2017 and CGST Rules, 2017
- Central Board of Indirect Taxes and Customs — Notifications and circulars on registration procedure
- GST Council — Meeting recommendations, including registration simplification measures
- GSTN advisories and releases — Biometric authentication and portal process updates
- ClearTax — GST registration guide — Practitioner walkthrough and document checklist
- TaxGuru — Registration procedure analysis — Case law and procedural commentary
- CAclubindia — Registration checklists — Peer-reviewed practical guidance
Frequently asked questions
- What is the turnover threshold for GST registration in India?
- For most states, registration becomes mandatory once aggregate turnover crosses Rs 40 lakh for exclusive suppliers of goods and Rs 20 lakh for suppliers of services. In special category states the limits are Rs 20 lakh and Rs 10 lakh respectively. Aggregate turnover is computed PAN-India and includes exempt and export supplies.
- Can a business be required to register even below the threshold?
- Yes. Section 24 of the CGST Act imposes compulsory registration irrespective of turnover on inter-state suppliers of goods, casual and non-resident taxable persons, agents, e-commerce operators, persons liable under reverse charge, input service distributors, and persons required to deduct or collect tax. Threshold exemptions do not apply to these categories.
- How long does GST registration approval take?
- Where Aadhaar authentication succeeds and the application is not flagged as risky, approval is generally issued within seven working days. Applications flagged for risk, or where Aadhaar authentication is not completed, undergo physical verification of the place of business and approval can extend to about thirty days from application.
- What is the penalty for operating without GST registration?
- Section 122 of the CGST Act prescribes a penalty of Rs 10,000 or the tax evaded, whichever is higher, for supplying goods or services without registration. The officer can also assess unregistered periods under Section 63, recover tax with interest at 18 percent, and deny the business the right to collect tax or pass on credit.