GST registration decides whether a small seller can legally invoice customers, claim tax credits and sell across state lines without penalty. Many sellers delay registration because they assume it only concerns large companies. The rules work differently: a trader crossing a lakh turnover limit, a service provider billing beyond twenty lakh rupees, or anyone selling through an online marketplace faces compulsory registration regardless of size. This guide walks through who must register, which documents to prepare and how the online process unfolds on the GST portal.
Who needs GST registration and at what turnover
Rahul owns a stationery shop in Jaipur, a normal category state, and sells only goods within Rajasthan. His registration threshold sits at the top of the scale because of where he trades and what he sells. Businesses dealing in goods enjoy a threshold limit of ₹40 lakhs, while service providers get ₹20 lakhs in Rajasthan and other normal category states. Priya, a freelance graphic designer in Mumbai, crosses into compulsory registration once her annual billing passes twenty lakh rupees, because her income comes from services rather than goods.
The lower bracket narrows further in India's northeast. A lower threshold of ₹10 lakh applies to suppliers making taxable supplies from Manipur, Mizoram, Nagaland and Tripura. A boutique owner in Imphal therefore registers far earlier than a counterpart in Jaipur selling the same volume of goods. Turnover is calculated on a PAN-India basis, not per state, so a seller with outlets in two states adds both figures together when checking against the limit.
Mixed businesses face a trap few sellers notice early. A business that supplies both goods and services applies the lower threshold applicable to its primary or mixed activity, so a business primarily providing services falls under the ₹20 lakh limit even if it also sells some goods. A hardware store that also repairs appliances loses the higher goods-only concession the moment repair income becomes a meaningful share of revenue.
Selling on Amazon and Flipkart: the e-commerce exception
Selling through an online marketplace changes the registration math entirely, regardless of how small the shop is. Selling goods to other states makes registration compulsory at any turnover, but small sellers on Amazon or Flipkart who sell only within their own state can use a free enrolment number instead.
Consider a home baker in Pune who lists cakes only for Pune pin codes on a food delivery app. Because every sale stays inside Maharashtra, she can rely on the enrolment number route rather than full registration. The moment she accepts an order from Bengaluru, the inter-state sale forces compulsory registration with no turnover exemption.
Service suppliers invoicing clients in other states get more breathing room than goods sellers. Inter-state service supply does not force registration, so a freelancer invoicing clients in other states stays exempt until the turnover threshold is crossed. A Kolkata-based content writer billing a Delhi agency therefore follows the standard ₹20 lakh services limit, not the e-commerce compulsory rule that applies to goods sellers.
Documents and steps for the online application
Registration happens entirely online, and the process splits into two parts. GST registration in India is done online on the GST portal (gst.gov.in) by filing Form GST REG-01 in two parts, verifying it with Aadhaar, and answering any query from the officer. Part A asks for the business PAN, mobile number and email address, and an OTP confirms both before the system issues a Temporary Reference Number.
Part B follows with the fuller application. The applicant logs into the GST portal using the TRN and fills and submits part-B of REG-01, covering registration type, business details, place of business, bank details and authorised signatory. Keep these items scanned and ready before starting: the PAN card of the proprietor, partners or directors, an Aadhaar card with a mobile number linked for OTP, proof of business address such as a rent agreement or electricity bill, a cancelled cheque or recent bank statement, a recent photograph of the applicant, and proof of business constitution where applicable, such as a partnership deed or incorporation certificate.
After document upload, some applicants face an extra step. The promoter or partner and the primary authorised signatory must visit the GST Suvidha Kendra given in the email for biometric verification, photo capture and document checks if the system does not accept simple Aadhaar OTP authentication. Once an officer approves the application, the GSTIN and login details are emailed, and the registration certificate in Form GST REG-06 can be downloaded from the portal.
Timing varies by route. Seven working days is the normal legal limit, three if you qualify for a fast route, and up to 30 if the officer wants to visit your premises. A seller who completes Aadhaar authentication cleanly, with address proof that matches the application exactly, usually clears the fast route without a site visit.
Does GST registration add too much paperwork for a small seller?
Many sellers hesitate because they picture three monthly returns and constant reconciliation. That worry holds for a business trading under the regular GST scheme, but it misses an alternative built for exactly this concern.
The composition scheme lets a qualifying seller pay a flat percentage of turnover instead of itemised GST on every invoice. The GST composition scheme is a simplified compliance route under Section 10 of the CGST Act for taxpayers with annual turnover up to Rs 1.5 crore, who pay tax at a flat rate of 1% to 6% and file just once a quarter.
Take a kirana store owner in Lucknow turning over eighty lakh rupees a year. Under the regular scheme she would file detailed monthly returns and charge standard GST rates on every item. Under composition, manufacturers and traders typically have a GST composition scheme rate of just 1% of turnover, and she files only a quarterly statement instead of monthly ones.
The trade-off is real, not cosmetic. Composition taxpayers pay a flat 1% to 6% of turnover, file once a quarter, and cannot collect GST from customers or claim input tax credit. A seller who buys heavily from GST-registered suppliers and wants to pass on input credit to business customers usually loses money under composition. The right choice depends on who actually buys from the shop, not just on the turnover figure.
Registering for GST changes what a small seller can legally do, not just what paperwork sits in a drawer. A valid GSTIN lets a shop issue tax invoices, claim input credit on purchases, sell across state borders and list on marketplaces that require it before onboarding sellers.
Start by matching turnover against the threshold table for your state and supply type. Gather PAN, Aadhaar, address proof and bank details before logging into the GST portal, since a business that approaches or crosses the threshold has exactly 30 days to apply for GST registration on the government portal. If quarterly filing and a flat tax rate suit the business better than monthly returns, check composition scheme eligibility before defaulting to regular registration.
