Last updated: 7 April 2026. GST registration is mandatory once your business crosses the applicable turnover threshold — or immediately if you fall into certain mandatory categories regardless of turnover. Failing to register when required may attract penalties of 10% of tax due (minimum ₹10,000) for non-fraud cases, rising to 100% where evasion is established, plus interest at 18% per annum on all back-taxes from the date you became liable.
Applicability Note: This guide is based on GST provisions applicable as of 7 April 2026, including the CGST Act, IGST Act, and relevant CBIC notifications. Always verify the current position on gst.gov.in or with a GST professional before taking action.
Who Should Care?
This guide applies to:
- New businesses approaching or crossing the GST turnover threshold for the first time
- Existing unregistered businesses making inter-state supplies or selling through e-commerce platforms
- Foreign businesses or non-resident persons supplying goods or services in India
- Business owners unsure whether their specific activity triggers mandatory registration
1. Turnover Thresholds for Mandatory GST Registration
The primary trigger for GST registration is your aggregate annual turnover. Thresholds vary by state category and type of supply:
| State Category | Goods Suppliers | Service Providers |
|---|---|---|
| General states (most of India) | Above ₹40 lakh | Above ₹20 lakh |
| Special category states* | Above ₹20 lakh | Above ₹10 lakh |
*Special category states with lower thresholds: Arunachal Pradesh, Himachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim, Tripura, and Uttarakhand.
Exception: Assam and Jammu & Kashmir, though classified as special category states, have opted for the higher ₹40 lakh threshold for goods (the same as general states). Telangana, a general category state, chose to maintain the ₹20 lakh threshold for goods instead of adopting ₹40 lakh. Always verify the threshold applicable in your specific state on the GST portal.
Aggregate Turnover Definition: Includes taxable supplies, exempt supplies, exports, and inter-state supplies across all GSTINs under the same PAN — calculated on an all-India basis. Does not include inward supplies on which tax is paid under the Reverse Charge Mechanism (RCM). If your combined turnover across all businesses under one PAN exceeds the threshold, all of them require registration.
2. Mandatory Registration Regardless of Turnover (Section 24, CGST Act)
Even if your turnover is below the threshold, registration is compulsory in these situations:
| Category | Why Registration Is Mandatory |
|---|---|
| Inter-state supply of goods | Any business supplying goods across state lines must register, regardless of turnover. (Inter-state supply of services is exempt from this mandatory rule — service providers still get the turnover threshold.) |
| E-commerce operators and sellers | Every e-commerce operator (Amazon, Flipkart, etc.) must register. Sellers supplying through e-commerce platforms must also register — the threshold exemption does not apply to them. |
| Reverse Charge Mechanism (RCM) recipients | Businesses liable to pay GST under RCM (e.g., importing services, or purchasing from unregistered suppliers in notified categories) must register even if their own turnover is below the threshold. |
| Casual taxable persons | Traders or businesses operating temporarily in a state where they have no fixed place of business (e.g., attending trade fairs or exhibitions in another state) must register before commencing supply. |
| Non-resident taxable persons | Foreign businesses or individuals making taxable supplies in India must register before starting any supply activity. |
| Input Service Distributors (ISD) | Any head office or branch that distributes ITC on input services to other branches must register as an ISD. |
| Agents of registered persons | Any person who makes supplies of goods or services on behalf of another registered taxable person as an agent must register. |
3. Documents Required
| Document | Details |
|---|---|
| PAN Card | Mandatory — GST registration is PAN-based |
| Aadhaar Card | For Aadhaar authentication (speeds up GSTIN issuance to 3 working days) |
| Proof of business address | Electricity bill, rent agreement, or NOC from property owner (if rented) |
| Bank account details | Cancelled cheque or bank statement showing account number and IFSC |
| Photographs | Passport-size photo of proprietor / all partners / all directors |
| Business incorporation proof | Certificate of Incorporation (companies), Partnership Deed (firms), LLP Agreement |
| Board resolution | Required for companies and LLPs to authorise the authorised signatory |
| Digital Signature Certificate (DSC) | Optional for companies, LLPs, partnerships and proprietorships |
4. Step-by-Step Registration Process on gst.gov.in
Step 1: Visit gst.gov.in and click "Register Now"
Go to gst.gov.in and navigate to Services → Registration → New Registration.
Step 2: Complete Part A — Basic Details
Enter your PAN, mobile number, and email address. OTPs are sent to both for verification. Once verified, a Temporary Reference Number (TRN) is generated — save this number.
Step 3: Complete Part B — Full Application
Log in with your TRN and complete the full registration form: business details, principal place of business, nature of business activities, bank account information, and document uploads.
Step 4: Aadhaar Authentication (Strongly Recommended)
Opting for Aadhaar authentication significantly reduces processing time. If authenticated successfully, GSTIN is typically issued within 3 working days. Without Aadhaar authentication, the application may require physical verification and take up to 7 working days.
Step 5: Receive ARN and Track Status
After submission, an Application Reference Number (ARN) is generated. Use this to track the status of your application on the portal.
Step 6: Officer Review
A GST officer reviews your application. If additional information or documents are required, they will raise a query in Form REG-03 within 3 working days. You must respond within 7 working days. Delays in responding to REG-03 can extend the process significantly.
Step 7: GSTIN Issued
Once the application is approved, your 15-digit GSTIN (Goods and Services Tax Identification Number) is issued — the unique identifier for your GST registration.
| Application Type | Typical Processing Time |
|---|---|
| Aadhaar-authenticated | 3 working days |
| Non-Aadhaar / physical verification required | 7 working days |
| REG-03 query raised (pending your response) | Extended to 30+ days depending on response time |
Fast-Track Option: Simplified 3-Day Registration Under Rule 14A
From 1 November 2025, small taxpayers whose monthly B2B output tax liability (total of CGST + SGST/UTGST + IGST + Cess on supplies to registered persons) does not exceed ₹2.5 lakh can opt for simplified electronic registration under Rule 14A of the CGST Rules (inserted via CGST Notification No. 18/2025 dated 31 October 2025). With Aadhaar authentication, GSTIN is auto-approved within 3 working days — no officer review is required unless the system flags a risk parameter.
How to opt in: While filling Form GST REG-01, select "Yes" under "Option for registration under Rule 14A." Complete Aadhaar authentication for the Primary Authorised Signatory and one Promoter/Partner.
Key restrictions under Rule 14A:
- Only one Rule 14A registration per State/UT per PAN is permitted
- The ₹2.5 lakh threshold is on the GST amount (not turnover) — calculate the total tax on your B2B invoices for a typical month
- B2C supply GST is excluded from this threshold calculation
- If your liability later exceeds ₹2.5 lakh/month, you must file Form GST REG-32 to withdraw and move to regular registration (no new GSTIN needed — the same GSTIN continues)
- All standard return filing and tax payment obligations continue as normal — Rule 14A only simplifies the registration process, not ongoing compliance
Note: Rule 14A is optional. If you prefer the standard registration route, or if your monthly B2B tax liability exceeds ₹2.5 lakh, proceed with the regular Aadhaar-authenticated process described above (typically 3-7 working days under Rule 9/9A).
5. Penalties for Not Registering When Required
Failing to register under GST when mandatory is an offence under Section 122 of the CGST Act. Penalties depend on whether non-registration was inadvertent or deliberate:
| Type of Non-Compliance | Penalty |
|---|---|
| Inadvertent / non-fraudulent | Higher of: 10% of tax due, or ₹10,000 minimum |
| Fraud, willful misstatement, or suppression of facts | 100% of tax due (minimum ₹10,000) |
Beyond the penalty, operating without a GSTIN when required means:
- You cannot legally issue tax invoices or collect GST from customers
- Your buyers cannot claim ITC on purchases from you — making you a less competitive supplier to GST-registered businesses
- Back-taxes, interest at 18% per annum, and penalties accumulate from the date you became liable to register
- Potential prosecution under the CGST Act in cases of wilful evasion
Key Takeaways
- GST registration is mandatory when aggregate turnover exceeds ₹40 lakh (goods) or ₹20 lakh (services) in general states — lower limits apply in special category states
- Several categories require mandatory registration regardless of turnover: inter-state goods supply, e-commerce sellers, RCM recipients, casual taxable persons, and non-resident persons
- Aadhaar authentication at the time of registration reduces GSTIN issuance time from 7 days to 3 working days
- Respond to REG-03 queries within 7 working days — delayed responses extend processing significantly
- Penalty for not registering: 10% of tax due (min ₹10,000) for inadvertent cases; 100% for fraud cases — plus 18% p.a. interest on all back-taxes from the date registration was due
- New businesses considering the Composition Scheme should indicate this preference at the time of registration using Form CMP-02
Frequently Asked Questions
What is the GST registration threshold for 2026?
In general states, GST registration is mandatory when annual aggregate turnover exceeds ₹40 lakh for goods suppliers and ₹20 lakh for service providers. In special category states (Arunachal Pradesh, Himachal Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim, Tripura, Uttarakhand), the threshold for goods is ₹20 lakh and for services is ₹10 lakh.
Do I need GST registration if I sell goods only within my own state?
If your annual aggregate turnover is below the applicable threshold (₹40 lakh in most states), and you sell goods only within your own state, registration is generally not mandatory. However, if you also sell on e-commerce platforms, or if your intra-state supplies include certain notified goods, mandatory registration may apply regardless of turnover.
How long does GST registration take in 2026?
With Aadhaar authentication, GSTIN is typically issued within 3 working days of application. Without Aadhaar authentication, the process takes up to 7 working days. If the GST officer raises a query (Form REG-03), the timeline can extend further depending on how quickly you respond.
What happens if I don't register for GST when I'm required to?
Non-registration when mandatory attracts a penalty of the higher of 10% of tax due or ₹10,000 under Section 122 of the CGST Act for inadvertent cases. For fraud or willful evasion, the penalty is 100% of the tax due. In addition, interest at 18% per annum accrues on all back-taxes from the date you became liable to register, and your buyers cannot claim ITC on purchases from you.
Can I register for both the regular scheme and the Composition Scheme?
No. You must choose one or the other at the time of registration. If you opt for the Composition Scheme, you pay a flat rate (1–6%) on your turnover, cannot claim ITC, and cannot issue tax invoices. If you opt for the regular scheme, you charge GST on supplies, claim ITC on purchases, and file monthly returns. You can switch from composition to regular (or vice versa) by filing the appropriate form, but not mid-year for the composition scheme.
Disclaimer: This article is for informational purposes only and does not constitute professional tax advice. GST rules are subject to frequent changes through notifications and circulars. Please consult a qualified tax professional or verify the current provisions on the official GST portal (gst.gov.in) before making any compliance decisions.
Have a specific question about GST registration or need help with your application? Our GST experts can help → gstconsultancy.com