GST registration looks simple on paper — fill a form on the GST portal, upload a few documents, get an ARN. In practice, a huge share of applications get stuck in query notices because of mismatched documents or missing details. This checklist covers exactly what you need before you file, so you don't end up in that loop.
Do you actually need to register?
Registration is mandatory once your aggregate turnover crosses ₹40 lakh for goods (₹20 lakh for most special-category states) or ₹20 lakh for services (₹10 lakh in special-category states). It's also mandatory regardless of turnover if you do inter-state supply, sell through an e-commerce operator, or are liable under reverse charge.
Many small businesses register voluntarily even below the threshold — mainly to claim input tax credit and to be able to bill larger B2B clients who require a GSTIN on the invoice.
Documents you'll need
For a proprietorship: PAN and Aadhaar of the proprietor, a photograph, proof of business address (electricity bill, rent agreement, or NOC from the owner), and bank account details (a cancelled cheque or bank statement).
For a company or LLP: PAN of the entity, Certificate of Incorporation, MOA/AOA or LLP agreement, PAN and Aadhaar of all directors/partners, board resolution authorising the signatory, and the same address and bank proofs as above.
The most common rejection reason we see: the address proof doesn't match the address entered in the form, or the rent agreement isn't registered/notarised where the state requires it. Double-check this before submission — it's the single biggest cause of delay.
Choosing the right business details on the form
You'll be asked to select HSN/SAC codes for your goods or services — get this right the first time, since it determines the tax rate applied to your invoices later. You'll also choose between regular and composition scheme (composition is only available if turnover is under ₹1.5 crore for goods, and comes with restrictions like no inter-state sales), and decide how many additional places of business to register.
What happens after you file
You'll get an ARN (Application Reference Number) immediately, and typically a GSTIN within 3–7 working days if there are no queries. If the officer raises a clarification (common when address or photo documents look unclear), you get a fixed window to respond — missing it means starting the application over.
Once you have your GSTIN, you're required to start filing returns (GSTR-1, GSTR-3B, etc.) on schedule even if you had zero sales that period — a lot of new registrants don't realise nil returns are still mandatory.
Regular scheme vs Composition scheme — which actually saves you money
The Composition Scheme lets small taxpayers pay a flat, low percentage of turnover as tax instead of the standard slab rates, with drastically simpler quarterly returns instead of monthly filings. It sounds like an easy win, but it comes with real trade-offs: you can't claim input tax credit, you can't sell inter-state, and you can't sell through most e-commerce marketplaces.
It tends to make sense for small, purely intra-state retail or restaurant businesses with low input costs; it tends to backfire for anyone buying significant raw materials or inputs on which they'd otherwise claim credit, or anyone planning to sell on Amazon/Flipkart, since composition dealers are barred from most marketplace selling. We assess this against your actual purchase and sales pattern rather than just turnover eligibility.
Common mistakes that trigger a GST notice later
Registering under the wrong 'principal place of business' category (residential vs. commercial vs. shared workspace) without the matching NOC format is a frequent, avoidable trigger for scrutiny. Declaring an incorrect business activity code, or registering for fewer additional places of business than you actually operate from, are two more common gaps that surface months later during a routine mismatch check rather than at registration time.
The safest approach is treating your GST registration details as something that has to stay accurate on an ongoing basis — any change in address, bank account, or business activity should be reflected via an amendment application, not left unreported until a notice forces the issue.
Key Takeaways
- Registration is mandatory above ₹40L/₹20L turnover (goods/services), but many register voluntarily for input credit.
- Address-proof mismatches are the single biggest cause of rejection — verify before filing.
- HSN/SAC code selection determines your invoice tax rate, so get it right upfront.
- Composition scheme saves on tax rate and filing complexity, but blocks input credit and marketplace/inter-state sales.
- Nil returns are still mandatory every period once registered, even with zero sales.
- Keep registration details (address, activity code, bank account) updated via amendment — don't let them drift.
Frequently Asked Questions
How long does GST registration take?+
3–7 working days typically, if all documents are in order and there's no clarification notice.
Can I register for GST without a commercial address?+
Yes — a residential address with a proper NOC/rent agreement and utility bill is accepted for most business types.
Should I choose the Composition Scheme?+
Only if you're a small, purely intra-state business with low input costs — it blocks input tax credit and most e-commerce/inter-state selling, so it doesn't suit every small business despite the lower headline tax rate.
What if I sell on Amazon or Flipkart?+
You need regular (non-composition) GST registration to sell through most e-commerce marketplaces — composition scheme dealers are generally barred from marketplace selling.