💼 Business & Franchise Desk
GST Registration 2026: Complete Online GSTIN Guide for Small Businesses
Who must register for GST, which turnover thresholds trigger it, how to apply online on gst.gov.in in five steps, the documents you need, GSTR-1 and GSTR-3B returns, and the special-category state rules that apply to West Bengal.
Shops, factories, online selling, service businesses — sooner or later everyone faces the same question: do I need GST? Many are afraid of it; many needlessly pay agents. The rule is actually clear, and you can do the application yourself — completely free.
Who must get GST (mandatory)
- Goods sales: when annual turnover crosses the limit (₹40 lakh in normal states; ₹20 lakh in special-category states)
- Service businesses: when annual turnover crosses ₹20 lakh (₹10 lakh in special states)
- Inter-state goods sales (including e-commerce), reverse charge cases, or if you’re a casual/non-resident taxable person — regardless of turnover
- Selling on marketplaces like Amazon and Flipkart makes a GSTIN mandatory
Below the limit it isn’t compulsory; you can take it voluntarily if you wish (see below).
Required documents
| Document | For whom |
|---|---|
| PAN card | Everyone — the business’s or promoter’s |
| Aadhaar and photograph | Promoter/owner |
| Address proof | For the business premises — electricity bill, rent agreement, ownership deed |
| Bank proof | Cancelled cheque/first page of statement |
| DSC (Class 2/3) | Mandatory for companies/LLPs |
Online application: 5 steps
- gst.gov.in → Services → Registration → New Registration
- Enter PAN, mobile, email → OTP verification → you’ll get a TRN (Temporary Reference Number)
- Open the draft with the TRN — business type, address, promoter details, HSN/SAC codes, bank
- Upload documents as PDFs (each under 1MB, JPEG/PDF) → submit with DSC or EVC
- You’ll get an ARN — after verification (usually 7 working days) the GSTIN is issued
If the officer sends a query (SCN), you must reply within 7 days — otherwise the application is rejected. So watch your email after receiving the ARN.
After registration, remember
- Invoices: issue invoices showing GSTIN, HSN/SAC and the tax split (CGST+SGST within the state / IGST inter-state)
- Returns: GSTR-1 (invoice details) + GSTR-3B (tax payment) — monthly or under the quarterly (QRMP) scheme
- Nil returns must also be filed — even with no sales; otherwise late fees and GSTIN suspension risks pile up
- Input credit: the tax you paid on purchases can be deducted from tax on sales — a major benefit
The case for voluntary GST
- B2B clients and marketplaces demand a GSTIN
- Input tax credit can be claimed
- Often a condition in large tenders/contracts
The flip side: a regular filing obligation — small retail with low sales is better off without it unless needed.
Common mistakes that bring notices
- Wrong HSN/SAC at registration — invoices and returns won’t reconcile later
- Using someone else’s bank account without disclosing it
- Late returns — daily late fees accumulate
- Claiming input credit from invoices the supplier never reported in GSTR-1
See also
🪜 Step-by-step guide
- Generate a TRN
gst.gov.in → Services → Registration → New Registration — provide PAN, mobile and email, verify the OTP and get a TRN.
- Fill in the application
Open the draft with the TRN — fill in the business address, promoter details, HSN/SAC and bank details.
- Upload documents
Upload PAN, Aadhaar, photograph, address proof and bank statement/cancelled cheque as PDFs.
- DSC/e-Verification
A DSC is mandatory for companies/LLPs; proprietorships are verified with EVC (OTP).
- GSTIN issued
After verification, the GSTIN and certificate are usually available on the portal within 7 working days.
❓ Frequently asked questions
Is GST registration free?
Yes — there is no government fee if you do it yourself on the portal. An agent/CA will charge their own service fee separately, but anyone claiming a 'government fee' is lying. Applications are made only on gst.gov.in.
Can I get GST even below the threshold?
Yes — voluntary registration. Large clients/marketplaces (Amazon, Flipkart) generally demand a GSTIN, and you also get input tax credit. Only take it in small retail if you actually need it, because the filing obligation begins too.
What is the difference between GSTR-1 and GSTR-3B?
In GSTR-1 you report the sales details of all the month's invoices; in GSTR-3B you file a summary and pay the actual tax. Under the quarterly payment scheme (QRMP), a small business files only 4 full returns a year — other months need just invoice details.