GST Registration Process in India: Complete Guide for New Businesses

GST registration is usually the first compliance step a new business takes, and it is also where founders make the most avoidable mistakes: registering too early, registering in the wrong state, or missing a compulsory-registration trigger that has nothing to do with turnover. This guide walks through who actually needs to register, when, and how, for any business supplying goods or services, whatever the legal structure.

Who Must Register for GST

Under Section 22 of the CGST Act, registration becomes mandatory once a person's aggregate turnover in a financial year crosses the prescribed threshold. The threshold depends on what you supply and where:

• Goods: Rs 40 lakh in most states; Rs 20 lakh in special category states (Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim, Tripura, Uttarakhand).
• Services: Rs 20 lakh in most states; Rs 10 lakh in special category states.
• Mixed supply of goods and services: generally follows the services threshold once any service component is involved, so check this with your CA if your business supplies both.

"Aggregate turnover" is computed on an all-India, PAN-wide basis, across all your business verticals and branches, not per state or per GSTIN.

Compulsory Registration Regardless of Turnover (Section 24)

Turnover thresholds do not apply to certain categories of suppliers, who must register the moment they start that activity, even with zero turnover so far:

• Persons making any inter-state taxable supply
• Casual taxable persons and non-resident taxable persons
• Persons required to pay tax under reverse charge
• E-commerce operators, and in many cases suppliers selling through an e-commerce operator required to collect tax at source
• Input service distributors
• Persons required to deduct tax at source (TDS under GST)
• Agents supplying on behalf of other taxable persons

This is the most common trap for new online sellers and consultants who assume they are safe below the general threshold, then find they triggered a compulsory-registration category on day one.

Should You Register Voluntarily Even Below the Threshold?

Voluntary registration below the threshold is allowed and is often a sound business decision, not just a compliance formality. It lets you claim input tax credit on business purchases, issue GST-compliant invoices that larger business customers often insist on before they will pay an invoice, and it signals a degree of formality that can matter when raising funds or bidding for larger contracts. The trade-off is the ongoing filing burden (return, whether monthly or quarterly), so weigh it against your actual customer base and purchase volume.

Documents Required

• PAN card of the business entity or the proprietor
• Identity and address proof of promoters, partners, or directors, with photographs
• Proof of the principal place of business: ownership document or rent/lease agreement, plus a recent electricity bill or property tax receipt
• Bank account proof: a cancelled cheque, bank statement, or the first page of the passbook
• Constitution document appropriate to the entity: partnership deed for a firm, LLP agreement for an LLP, or the certificate of incorporation and MOA/AOA for a company
• Digital signature (mandatory for companies and LLPs; optional but useful for proprietorships and partnerships)

Step-by-Step Registration Process

1. File Part A of Form GST REG-01 on the GST portal with PAN, mobile number, and email; you receive a Temporary Reference Number (TRN) after OTP verification.
2. File Part B using the TRN, uploading business details and the documents listed above.
3. Complete Aadhaar authentication for the primary authorized signatory. This is the single biggest factor in how fast your application moves; authenticated applications are fast-tracked, unauthenticated ones default to physical verification.
4. Officer review: if the application is complete and authenticated, the GSTIN is typically issued within about 7 working days. If flagged for site verification or additional documents, it can extend to around 30 days.
5. GSTIN and registration certificate issued electronically via Form GST REG-06, after which you can start raising GST-compliant invoices.

Common Mistakes That Delay Registration

Address proof that does not match the applicant's name, an expired or mismatched rent agreement, skipping Aadhaar authentication, and applying with the wrong constitution type for the entity are the most frequent causes of delay or rejection. Getting these right the first time is far faster than correcting them after a query is raised, since each query response resets part of the processing clock.

If you are registering GST specifically as part of setting up a new startup and want the sequence tied into your broader post-incorporation compliance, see our dedicated guide on GST registration and first return for startups. This post covers the general registration rules that apply to any business, goods or services, any structure; that one walks through the startup-specific sequence and first GSTR-3B filing.