GST Registration: Step-by-Step Guide for New Businesses 2026

Who Needs to Register for GST

GST registration is mandatory once your business crosses the prescribed turnover threshold or falls into specified categories, regardless of turnover. Understanding which bucket you fall into is the first step.

Turnover-Based Thresholds

Under Section 22 of the CGST Act, the basic threshold for suppliers of goods is an aggregate annual turnover of Rs 40 lakh (Rs 20 lakh for special category states such as the North-Eastern states, Himachal Pradesh, and others). For service providers, the threshold is Rs 20 lakh (Rs 10 lakh for special category states).

For example, a Bengaluru-based graphic designer earning Rs 18 lakh a year is below the service threshold and need not register, while a Delhi trader selling goods worth Rs 45 lakh must register.

Compulsory Registration Regardless of Turnover

Section 24 lists categories that must register even if turnover is below the threshold. These include:

• Persons making inter-state taxable supplies of goods
• E-commerce operators and sellers supplying through platforms like Amazon or Flipkart
• Casual taxable persons and non-resident taxable persons
• Persons liable to pay tax under reverse charge
• Input service distributors and agents supplying on behalf of others
• Persons required to deduct TDS or collect TCS under GST

A freelancer in Pune selling digital services to clients in another state, for instance, technically falls under inter-state supply rules and should evaluate registration carefully, though there are notified exemptions for small service providers.

Documents Required for GST Registration

Keeping documents ready in the correct format (usually JPEG or PDF within prescribed size limits) prevents repeated uploads and rejections.

For the Business and Promoters

• PAN of the business or proprietor
• Aadhaar of the proprietor, partners, or directors
• Photographs of promoters and authorised signatory
• Proof of business registration (partnership deed, incorporation certificate, etc.)
• Bank account details such as a cancelled cheque or first page of the passbook

Proof of Principal Place of Business

• Owned premises: latest electricity bill, property tax receipt, or municipal khata copy
• Rented premises: rent agreement along with the landlord's ownership proof
• Consent letter where premises are shared, along with the owner's document

Authorisation Documents

A Letter of Authorisation or board resolution is needed to appoint the authorised signatory who will operate the GST account. For a private limited company, a board resolution naming a director as signatory is standard.

Step-by-Step GST Registration Process

The registration happens in two parts: generating a Temporary Reference Number (TRN) and then completing the detailed application.

Step 1: Generate the TRN (Part A)

Visit the GST portal and select Services, then Registration, then New Registration. Choose 'Taxpayer', select your state and district, and enter the legal name as per PAN, the PAN itself, email, and mobile number. After verifying the OTPs sent to your email and phone, you receive a 15-digit TRN valid for 15 days.

Step 2: Fill Part B of the Application

Log in using the TRN and complete the detailed form across tabs:

• Business Details: trade name, constitution of business, and reason for registration
• Promoter/Partner details: personal and identity information
• Authorised Signatory: the person operating the account
• Principal Place of Business: address with supporting documents
• Additional Places of Business: branches or warehouses
• Goods and Services: HSN codes for goods and SAC codes for services
• Bank Accounts: optional at registration but required before filing returns
• State-specific information such as professional tax details where applicable

Step 3: Aadhaar Authentication

The portal offers Aadhaar authentication, which speeds up approval significantly. Where the authorised signatory and promoters complete Aadhaar e-KYC, registration is often granted within a few working days. If you opt out of Aadhaar authentication, physical verification of the premises may be conducted before approval, which takes longer.

Step 4: Verification and Submission

Submit the application using a Digital Signature Certificate (DSC) — mandatory for companies and LLPs — or via Electronic Verification Code (EVC) for proprietors and partnerships. On submission, an Application Reference Number (ARN) is generated, which you can use to track status.

Step 5: Receiving Your GSTIN

Once the officer approves the application, a 15-digit GSTIN is issued and the registration certificate in Form GST REG-06 becomes available for download from the portal. The first two digits represent the state code, the next ten the PAN, and the rest are entity and check digits.

Composition Scheme: An Option for Small Businesses

During registration, eligible small businesses can opt for the Composition Scheme under Section 10. This allows a flat, lower rate of tax with simpler quarterly payments and annual returns, but bars input tax credit and inter-state outward supplies. A small restaurant or local trader with turnover up to Rs 1.5 crore (Rs 75 lakh in some states) may find this attractive, while a business wanting to pass on input credit should opt for the regular scheme.

After Registration: Immediate Compliance

Getting the GSTIN is only the beginning. You must:

• Display the GSTIN and certificate prominently at your place of business
• Issue GST-compliant tax invoices with all mandatory fields
• File returns on time — GSTR-1 for outward supplies and GSTR-3B for summary and payment, or the quarterly QRMP scheme for eligible small taxpayers
• Reconcile input tax credit with GSTR-2B as governed by Rule 36(4) and Section 16 conditions

Failing to file returns, even nil returns, attracts late fees and can lead to suspension or cancellation of registration.

Common Mistakes to Avoid

Mismatch Between PAN and Legal Name

The legal name entered must match the PAN database character for character. Even a minor spelling variation triggers validation errors and rejection. Always verify against the PAN.

Weak Address Proof

A large share of clarification notices relate to the principal place of business. Upload a clear, recent document, ensure the rent agreement is valid and matches the address, and attach the landlord's ownership proof and a consent letter where needed.

Choosing the Wrong Business Constitution

Selecting proprietorship when you are actually a partnership, or vice versa, creates inconsistencies with the documents uploaded. Match the constitution to your actual legal structure and supporting registration documents.

Ignoring Aadhaar Authentication

Skipping Aadhaar authentication often leads to physical verification and longer processing. Unless you have a specific reason, completing Aadhaar e-KYC is the faster, smoother route.

Incorrect HSN or SAC Codes

Entering wrong or vague HSN codes for goods or SAC codes for services can cause issues later when filing returns and invoices. Identify the correct codes for your main supplies at the outset.

Delaying Registration After Crossing the Threshold

Once you cross the threshold or fall under compulsory registration, you must apply within 30 days. Operating without registration while liable can attract penalties and denial of input tax credit on past purchases.

Letting the TRN Expire

The TRN is valid for only 15 days. Many applicants generate it, then delay completing Part B until it lapses, forcing them to restart. Keep all documents ready before generating the TRN.

Voluntary Registration: Should You Opt In?

Businesses below the threshold can register voluntarily. This is worthwhile if your customers are GST-registered and want to claim input credit, or if you wish to build credibility and trade across states. However, voluntary registration brings the full compliance burden of regular return filing, so weigh the administrative effort against the benefits before opting in.