GST Registration in India: Who Needs It, When It's Mandatory & How to Apply

GST (Goods and Services Tax) registration is one of the most common compliance requirements Indian businesses run into — yet many founders remain unsure whether they actually need it, or when it becomes mandatory. Getting this wrong can mean either unnecessary compliance overhead or, worse, penalties for non-registration.
 

This guide breaks down exactly who needs GST registration, the applicable thresholds, and how the process works. If you'd rather have it handled for you, Ofin Legal's GST Registration service manages the entire filing process — you can explore their full range of compliance services on the Ofin Legal homepage. 
 

What Is GST Registration?
 

GST registration is the process of registering a business under India's Goods and Services Tax regime, administered by the GST Council. Once registered, a business receives a GSTIN (GST Identification Number) and is legally required to collect GST on taxable sales, file periodic returns, and claim input tax credit on eligible purchases.
 

Who Needs to Register for GST?

GST registration becomes mandatory when:
 

• Annual turnover crosses the threshold – ₹40 lakhs for goods suppliers in most states (₹20 lakhs for special category states), and ₹20 lakhs for service providers (₹10 lakhs in special category states)
• Selling through e-commerce platforms – Registration is required regardless of turnover if you sell via platforms like Amazon, Flipkart, or Meesho
• Inter-state supply of goods or services – Businesses supplying across state lines generally need GST registration irrespective of turnover
• Exporting goods or services – Including digital services and AdSense-style income, which is treated as an export of service
• Voluntary registration – Even below the threshold, many businesses register voluntarily to claim input tax credit and appear more credible to B2B clients
   

Documents Required for GST Registration
 

• PAN card of the business/proprietor
• Aadhaar card
• Proof of business registration (Certificate of Incorporation, Partnership Deed, etc., depending on structure)
• Address proof of the business premises
• Bank account statement or cancelled cheque
• Digital signature (for companies and LLPs)
   

How to Apply for GST Registration
 

1. Prepare documents – Gather PAN, Aadhaar, business proof, and address proof in advance to avoid delays
2. Apply on the GST portal – The application is filed online with business details, promoter information, and supporting documents
3. ARN generation – Once submitted, an Application Reference Number (ARN) is generated for tracking
4. Verification – The GST department reviews the application; additional documents or clarification may be requested
5. GSTIN issuance – Once approved, a unique GSTIN is issued, typically within a few working days if documentation is in order
    

What Happens If You Don't Register When Required?
 

Operating without mandatory GST registration can result in penalties, interest on unpaid tax, and complications during future audits or funding rounds — since most investors and larger clients expect GST compliance as a baseline.

GST registration isn't just a compliance checkbox — it directly affects how a business collects tax, claims credit, and gets treated by larger clients and platforms. Understanding the thresholds and requirements early helps avoid both unnecessary registration and costly non-compliance.