GST Registration in India: Thresholds and How to Apply

Cross ₹40 lakh in turnover selling goods, or ₹20 lakh selling services, and GST registration stops being optional. For plenty of freelancers, consultants, and small businesses, though, the more common trigger isn't turnover at all. Selling on an e-commerce platform, or supplying across a state border, makes registration mandatory long before turnover would. Here's exactly who needs to register, who can register voluntarily, and what the process actually involves.

Turnover Thresholds for Mandatory Registration

The basic turnover threshold depends on what you sell and where you're based. Suppliers of goods must register once aggregate turnover crosses ₹40 lakh in a financial year; suppliers of services cross that line at ₹20 lakh. A handful of special category states, mainly in the North-East and the Himalayan region, apply lower thresholds, though several states in that category have since opted up to the standard limits, so it's worth confirming your specific state's current threshold rather than assuming the older, lower figures still apply everywhere in that group.

Aggregate turnover is calculated across all your business verticals under the same PAN, all-India, not state by state or business by business. Run two different ventures on the same PAN, and their turnover is added together for this test, even if neither one alone would cross the threshold.

Registration Is Mandatory Regardless of Turnover, in These Cases

• Inter-state taxable supply: the moment you supply goods or services across a state border, registration is mandatory from the first rupee, regardless of turnover.
• Selling through an e-commerce operator: suppliers using platforms like Amazon or Flipkart generally need registration even below the turnover threshold, though a 2023 relaxation lets small intra-state goods sellers list on notified e-commerce platforms using PAN-based enrolment instead of full registration, worth checking if it applies to your situation.
• E-commerce operators themselves, who must register and collect tax at source regardless of their own turnover.
• Casual taxable persons and non-resident taxable persons, supplying on an occasional or short-term basis without a fixed place of business in India.
• Anyone liable to pay tax under reverse charge, or acting as an agent supplying on behalf of another registered person.
• Input Service Distributors, and anyone required to deduct tax at source under GST.

Voluntary Registration: Why Some Businesses Opt In Early

Nothing stops a business below the threshold from registering anyway, and plenty do. Voluntary registration unlocks input tax credit on your own purchases, lets you supply inter-state or sell through e-commerce platforms without waiting to hit a mandatory trigger, and often matters for credibility with buyers who prefer dealing only with GST-registered vendors. Once you register voluntarily, though, the same compliance obligations, return filing and invoicing rules among them, apply exactly as they would for anyone who crossed the threshold normally.

What You Need, and How Long It Takes

A standard application needs PAN, Aadhaar, a photograph, proof of your business constitution (partnership deed, incorporation certificate, and the like), address proof for your place of business, and bank account details; companies and LLPs additionally need a digital signature. Most low-risk applicants now move through a simplified, largely automated approval track introduced in late 2025, with a GSTIN issued within about 3 working days when nothing gets flagged for review. Applications that are flagged, or that involve physical verification of the business premises, follow the older timeline of roughly 7 working days for straightforward cases and up to 30 days where verification or additional documents are required. Depending on your state and risk profile, verification may also involve biometric Aadhaar authentication at a GST Suvidha Kendra rather than simple OTP-based e-KYC.

Understanding Your GSTIN

Once approved, you're issued a 15-character GSTIN: a 2-digit state code, your 10-character PAN, a single digit identifying how many registrations you hold against that PAN in that state, a default character, and a final checksum character. Because your PAN is embedded directly in it, a business operating in multiple states holds a separate GSTIN for each one, all built on the same underlying PAN.

A Quick Note on GST Rates Since GST 2.0

If you're registering for the first time, don't plan around the old four-slab structure of 5%, 12%, 18%, and 28% that a lot of older material online still describes. A rate rationalisation that took effect in September 2025, widely referred to as GST 2.0, moved most goods and services onto a simpler structure: a nil rate for staples, education, and specified life-saving drugs, 5% for merit goods, 18% as the standard rate covering most goods and services (including many items that previously sat at 28%), and a new 40% demerit rate reserved for tobacco, pan masala, sugary or caffeinated drinks, and select luxury and sin goods. Gold and silver continue to be taxed separately at their own long-standing rate. Confirm the current rate for your specific product or service before pricing anything, rather than relying on a pre-2025 rate card.

Registering is usually just the first decision, not the only one. Many small businesses that just crossed the threshold are also eligible for the composition scheme, which trades input tax credit for a simpler, lower-rate compliance routine, and it's worth comparing both before filing your first return. If you're a manufacturing or service business registering for the first time, it's also worth checking whether Udyam registration applies to you alongside GST, since the two serve different purposes but tend to get set up around the same time.