Registration is what turns a business from an outsider to the GST system into a participant in it, able to charge GST, claim Input Tax Credit, and issue valid tax invoices. Whether you need it, and when, depends on turnover and on a separate list of categories where turnover doesn’t matter at all.
Who Must Register: Turnover Thresholds
Registration is driven by aggregate turnover in a financial year, computed on a PAN-India basis across every place of business under that PAN, not state by state:
- Goods suppliers: ₹40 lakh in normal category states, ₹20 lakh in special category states
- Service providers (and mixed suppliers of goods and services): ₹20 lakh in normal category states, ₹10 lakh in special category states
Special category states are a specific set of northeastern and Himalayan states given lower thresholds. A few of them, including Assam and Jammu & Kashmir, have opted to apply the higher normal-state thresholds instead, so it’s worth confirming the current position for a particular state rather than assuming.
Aggregate turnover is a wider number than most people expect. It includes all taxable supplies, exempt supplies, exports, and inter-state supplies made under the same PAN, and excludes only the GST charged on those supplies and inward supplies taxed under reverse charge. A business supplying a mix of taxable and exempt goods counts both toward the threshold, even though only the taxable portion is actually taxed.
Who Must Register Regardless of Turnover
Section 24 of the CGST Act lists categories that must register the moment they start operating, with no threshold exemption:
- Persons making inter-state taxable supply
- Casual taxable persons and non-resident taxable persons
- Persons liable to pay tax under reverse charge
- E-commerce operators, and most sellers supplying through e-commerce platforms
- Input Service Distributors
- Persons required to deduct or collect tax at source (TDS/TCS under GST)
- Agents supplying on behalf of other registered persons
- Suppliers of online information and database access or retrieval (OIDAR) services from outside India to unregistered recipients in India
Voluntary Registration
Anyone below the threshold can register voluntarily. Once registered, voluntary registrants are subject to the same compliance obligations as anyone else, regular returns, invoicing rules, and so on, so it’s a deliberate trade-off rather than a free option.
The Registration Process
Registration is filed online as Form GST REG-01 on the GST portal, tied to the applicant’s PAN. Typical documents include PAN, proof of business constitution (partnership deed, incorporation certificate, and so on), address proof for the principal place of business, bank account details, photographs, and authorisation for the signatory.
Timelines depend heavily on Aadhaar authentication:
- With Aadhaar authentication completed and no risk flags, approval typically comes within 7 working days under Rule 9 of the CGST Rules.
- If the application is flagged for physical verification, it can take up to 30 working days.
- A newer, faster track under Rule 14A (effective 1 November 2025) allows approval within 3 working days for applicants whose expected monthly output tax liability is up to ₹2.5 lakh, via Aadhaar authentication, on condition that the applicant doesn’t hold another registration under the same PAN in the same state or UT.
- Aadhaar authentication itself has its own clock: it must be completed within 15 days of starting the application, or no Application Reference Number is generated and the application is treated as never filed.
Once approved, registration is identified by a 15-character GSTIN: 2 digits for the state code, 10 for the applicant’s PAN, 1 entity code (distinguishing multiple registrations under the same PAN in a state), a default 14th character, and a final checksum digit.
After Approval: Two Things Worth Diarising
- Bank account details must be added on the portal within 30 days of the GSTIN being issued. This has become the most common reason new registrations get automatically suspended shortly after being granted.
- Effective date of registration depends on timing: if the application is filed within 30 days of the date turnover crossed the threshold (or a mandatory-category trigger occurred), registration is effective from that liability date. If filed later, it’s effective only from the date registration is actually granted, meaning any supplies made in the gap were technically made without valid registration.
Types of Registration
Beyond regular registration, a few variants exist for specific situations: Composition Scheme registration for eligible small taxpayers (covered separately), Casual Taxable Person and Non-Resident Taxable Person registration for short-term or one-off presence in India, Input Service Distributor registration for entities distributing common input credit across branches, and TDS/TCS deductor registration for entities required to deduct or collect tax at source.
Multiple Registrations
A separate registration is needed in every state or UT where a business has a place of business, a sales office, a warehouse, or any other fixed establishment, not only where sales are made. Within a single state, a business can also apply for separate registrations for genuinely distinct business verticals under the same PAN.
Penalty for Not Registering
Under Section 122(1) of the CGST Act, failing to register when required attracts a penalty of ₹10,000 or 10% of the tax due, whichever is higher, in addition to the tax itself plus interest, calculated from the date registration became mandatory rather than the date it was eventually obtained. Where the failure involves fraud or wilful suppression, the penalty rises to ₹10,000 or the full tax due, whichever is higher, and can extend to prosecution in serious cases. Goods and the vehicles transporting them can also be detained under Section 129 if found moving without a valid registration where one was required.
FAQs
Why would a business register voluntarily below the threshold?
Mainly to claim Input Tax Credit on purchases, to invoice registered B2B buyers who need that credit passed through, and because many marketplaces, platforms, and larger clients simply require a GSTIN before they’ll do business with a supplier.
Does the threshold turnover include exempt supplies, or only taxable ones?
It includes exempt supplies too. Aggregate turnover counts everything, taxable, exempt, and exported, under the same PAN, even though only the taxable portion is actually taxed once registered.
I have a warehouse in another state but no sales staff there. Do I still need to register there?
Generally yes. Registration is tied to having a place of business in a state, which includes a warehouse or godown, not only a sales presence.
Can I get separate GST registrations for different business verticals in the same state?
Yes, this is allowed under the same PAN and is useful when running genuinely distinct lines of business, such as a restaurant and a separate trading operation, that are cleaner to account for separately.
Can I raise GST invoices before I actually receive my GSTIN?
No. GST can only be charged once registration is granted. If the effective date of registration ends up earlier than the grant date, invoices for that gap period are typically corrected through a revised invoice rather than being raised in advance.
What happens if I don’t complete Aadhaar authentication in time?
If it isn’t completed within 15 days of starting the application, no ARN is generated. The application is treated as never submitted, and it has to be filed again from scratch.
Why do some new GST registrations get suspended shortly after approval?
The most common reason currently is not adding bank account details within 30 days of the GSTIN being issued, which triggers automatic suspension under a GSTN advisory from November 2025.
Can GST registration be cancelled if a business closes or turnover falls below the threshold?
Yes, registration can be surrendered or cancelled on application, or by the department in certain circumstances. Falling below the threshold on its own does not cancel registration automatically; it has to be applied for.
If I supply only exempt goods or services, do I need to register even above the threshold?
Generally no. Section 23 of the CGST Act exempts persons dealing exclusively in wholly exempt or non-taxable supplies from registration, regardless of turnover, unless they fall into one of the mandatory categories under Section 24.
I’m a freelancer serving only clients outside India. Do I need to register?
If turnover crosses the applicable threshold, yes. Export of services is zero-rated, not exempt, so it counts toward aggregate turnover in full. Many freelancers in this position register voluntarily even below the threshold, since it enables claiming a refund of accumulated input tax credit.
This article is for general information and does not constitute tax advice. Registration requirements and thresholds can be fact-specific and vary by state. For guidance on your situation, contact Chhajer Yash & Co. at ychhajer17@gmail.com.
Chhajer Yash & Co. 
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