GST Registration: Process and Documents

GST registration is the process through which a business obtains a Goods and Services Tax Identification Number (GSTIN) — a 15-digit unique identifier that allows it to collect GST from customers, claim input tax credit on purchases, and file GST returns. This guide explains who must register, what documents are required, the exact steps on the GST portal, and what registration unlocks for your business.

Key Takeaways

• Mandatory for businesses with aggregate turnover above ₹40 lakh (goods) or ₹20 lakh (services) in most states
• Special category states have lower thresholds: ₹20 lakh (goods) and ₹10 lakh (services)
• Inter-state supply triggers compulsory registration regardless of turnover
• GSTIN is typically issued within 3–7 working days of a complete application
• Penalty for non-registration: 100% of tax due or ₹10,000, whichever is higher
• Voluntary registration is allowed and beneficial for B2B businesses

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Who Must Register for GST?

Mandatory Registration — Threshold-Based

A business must obtain GST registration when its aggregate annual turnover crosses the prescribed threshold:

Type of Supply	Normal States	Special Category States
Supply of goods only	₹40 lakh	₹20 lakh
Supply of services (or both goods and services)	₹20 lakh	₹10 lakh

Special category states (with lower thresholds): Manipur, Mizoram, Nagaland, Tripura (₹10 lakh for services; ₹20 lakh for goods). States like Uttarakhand, Himachal Pradesh, Arunachal Pradesh, Meghalaya, Assam, Sikkim, and Jammu & Kashmir have ₹20 lakh threshold for services.

Aggregate turnover includes the value of all taxable, exempt, and zero-rated supplies and exports. It excludes CGST, SGST, IGST, and cess paid.

Mandatory Registration — Regardless of Turnover

Certain categories of persons must register even if their turnover is below the threshold:

• Inter-state suppliers of taxable goods or services
• E-commerce operators and those selling through e-commerce platforms (unless specifically exempt)
• Casual taxable persons (those making occasional taxable supplies without a fixed place of business)
• Non-resident taxable persons
• Persons required to deduct TDS under GST (government departments, public sector units above specified limits)
• Input service distributors
• Persons making reverse charge payments

Voluntary Registration

Any person can register voluntarily even below the threshold. This is worth considering if:

• Your customers are GST-registered businesses who need input tax credit on their purchases from you
• You want to claim input tax credit on your own purchases and business expenses
• You plan to scale and will cross the threshold soon

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Documents Required for GST Registration

Gather these documents before starting the online application:

For Proprietorship / Individual

• PAN of the proprietor
• Aadhaar card of the proprietor (for Aadhaar-based authentication, which speeds up processing)
• Photograph of the proprietor
• Proof of business address (owned: electricity bill / property tax receipt; rented: rent agreement + electricity bill of owner)
• Bank account statement / cancelled cheque (showing business name and account number)

For Partnership Firm

• PAN of the firm
• Partnership deed
• PAN and Aadhaar of all partners
• Photographs of all partners
• Proof of business address
• Bank details of the firm's account

For Private Limited / OPC / LLP

• Certificate of Incorporation
• PAN of the company/LLP
• Memorandum of Association and Articles of Association (for company)
• Board resolution or authorisation letter for the authorised signatory
• PAN and Aadhaar of the authorised signatory and directors
• Proof of registered office address
• Bank account details of the company

Additional Documents (as applicable)

• For digital signature (DSC): Class 2 or Class 3 DSC is required for companies and LLPs; individuals/proprietors can use Aadhaar OTP instead
• For multiple places of business: Address proof for each additional place of business
• For SEZ units: SEZ developer certificate

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Step-by-Step GST Registration Process on the GST Portal

Step 1: Generate Temporary Reference Number (TRN)

1. Visit www.gst.gov.in → Services > Registration > New Registration
2. Select I am a: Taxpayer → Business type → State and District
3. Fill in the legal name of business (as per PAN), PAN, email ID, and mobile number
4. An OTP is sent to the mobile and email — enter both OTPs to verify
5. A Temporary Reference Number (TRN) is generated and sent to your email and mobile

Step 2: Complete Part B of the Application Using TRN

1. Go back to New Registration → select Temporary Reference Number (TRN)
2. Enter TRN and complete OTP verification
3. Your application (Part B) opens — fill in all 10 tabs:
   • Business Details: Business name, Constitution of business, reason for registration, commencement date
   • Promoter / Partners: Details of proprietor, partners, or directors with PAN, Aadhaar, DIN, designation, and photograph
   • Authorised Signatory: Person authorised to sign GST documents (can be a promoter or a CA/employee)
   • Authorised Representative: CA or agent authorised to act on your behalf (optional)
   • Principal Place of Business: Complete address with proof
   • Additional Places of Business: Any branch offices
   • Goods and Services: Select HSN codes (4-digit for goods) or SAC codes (for services) for your primary business activities
   • Bank Accounts: Details of bank accounts used for business (at least one required)
   • State Specific Information: As applicable for your state
   • Aadhaar Authentication: Verify via OTP or e-KYC

Step 3: Upload Documents and Submit

1. Upload scanned copies of all required documents (JPG/PDF, max 1 MB each)
2. Sign the application — companies and LLPs must use DSC; others can use EVC (OTP to registered mobile) or Aadhaar OTP
3. Click Submit — an Application Reference Number (ARN) is generated

Save the ARN. You can use it to track application status.

Step 4: Processing and GSTIN Issuance

• The GST officer reviews the application
• If Aadhaar authentication is completed: approval typically within 3 working days
• If physical verification is required: may take up to 7 working days or longer
• You will receive the GSTIN and Registration Certificate (Form GST REG-06) via email and on the GST portal

Step 5: Post-Registration Requirements

Once you have GSTIN:

• Display GSTIN on your signboard at the principal place of business
• Issue GST-compliant tax invoices for every supply
• File monthly or quarterly GST returns (GSTR-1 and GSTR-3B)
• Maintain proper accounts and records

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GST Rates: What Rate Applies to Your Supplies?

GST is structured into four primary rates:

GST Rate	Applicable to
0% (Nil rated)	Essential goods: most fresh food, books, unbranded cereals, health services
5%	Common use items: packaged food, transport services, restaurants (without alcohol)
12%	Standard items: mobile phones, business class air travel, fertilizers
18%	Standard services and goods: most professional services, IT services, manufactured goods
28%	Luxury and sin items: luxury cars, pan masala, aerated drinks, gambling

For services, the most common rate is 18%. HSN / SAC code determination is important to avoid misclassification.

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Benefits of Being GST Registered

1. Claim Input Tax Credit (ITC)

GST registered businesses can claim credit for the GST they pay on business purchases (inputs). This avoids cascading taxes and reduces your effective cost of purchases. For example, if you pay ₹1,800 in GST on office supplies, you can set this off against your GST liability on sales.

2. Supply to GST-Registered Businesses

B2B customers (other GST-registered companies) prefer suppliers who are registered, because they need invoices with GSTIN to claim ITC. Without GSTIN, you may lose B2B clients or be forced to quote lower to compensate for their inability to claim ITC.

3. Inter-State Transactions

GST registration enables you to legally supply goods and services across state borders. Unregistered suppliers cannot make taxable inter-state supplies.

4. Legal Compliance and Credibility

A GSTIN adds credibility, particularly for newer businesses bidding on government contracts or working with larger enterprises that require supplier compliance documentation.

5. Access to Government Schemes

Several government schemes — including Startup India recognition, MSME/Udyam certification, and certain export schemes — require a valid GSTIN.

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GST Compliance After Registration

Registration is the first step. Ongoing compliance includes:

• Issuing correct GST invoices (mentioning GSTIN, HSN/SAC, tax amount)
• Filing GSTR-1 (outward supply details): 11th of next month (monthly) or 13th of next month after quarter (quarterly under QRMP)
• Filing GSTR-3B (summary return with tax payment): 20th/22nd/24th depending on turnover and category
• Filing GSTR-9 (annual return) by 31 December of the following financial year
• Maintaining records for 6 years from the due date of the relevant annual return

For detailed step-by-step guidance on filing GSTR-1 and GSTR-3B, see our dedicated guide. For accounting and bookkeeping systems that keep your GST records audit-ready, structured bookkeeping from the start saves significant rework later.

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Common Reasons for GST Application Rejection or Delay

• Document mismatch (name on PAN vs bank account, or address mismatch)
• Uploaded documents are unclear, incomplete, or in the wrong format
• Aadhaar not linked to mobile for OTP authentication
• DSC not registered for companies and LLPs
• Business address proof not accepted (landlord's documents not matching)

If your application is rejected, the GST officer sends a Show Cause Notice (SCN) with reasons. You can respond and resubmit, or appeal if the rejection is unwarranted.

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This article is for general informational purposes only and does not constitute professional advice. GST thresholds, rules, and procedures are subject to changes by the GST Council and government notifications. Consult a qualified tax professional for guidance specific to your business.