Compulsory registration under GST applies to specific businesses and persons under Section 24 of the CGST Act, even if annual turnover is below Rs. 20 lakh or Rs. 40 lakh threshold limits. Check mandatory GST registration categories, required documents, penalties, and online application steps in one place.
In summary
- Compulsory GST registration is mandatory for specified persons under Section 24 of the Central Goods and Services Tax Act, 2017, regardless of turnover limits.
- E-commerce operators, interstate taxable suppliers, non-resident taxable persons, casual taxable persons, and businesses liable under reverse charge mechanism must register under GST before starting taxable operations.
- The standard GST threshold exemption is Rs. 40 lakh for goods suppliers and Rs. 20 lakh for service providers in most states, but these limits do not apply to compulsory registration categories.
- Businesses failing to register when required can face a penalty of 10% of tax due or Rs. 10,000, whichever is higher, under GST provisions.
- Compulsory registration also enables businesses to collect GST legally, issue tax invoices, and claim eligible input tax credit.
What is compulsory registration under GST?
Compulsory registration under GST refers to mandatory GST enrolment for specific categories of persons listed under Section 24 of the Central Goods and Services Tax Act, 2017. These persons must obtain GST registration even if their annual aggregate turnover is below the standard exemption threshold.
Under the GST framework, businesses generally register once turnover exceeds Rs. 20 lakh for services or Rs. 40 lakh for goods in eligible states. However, Section 24 overrides these limits for notified categories such as interstate suppliers, e-commerce operators, non-resident taxable persons, and persons liable under reverse charge mechanism. The law requires registration before taxable supply begins.
Section 24 of CGST Act: persons liable for compulsory GST registration
Section 24 of the CGST Act specifies categories of persons who must obtain GST registration irrespective of annual turnover.
Persons covered under compulsory GST registration
- Interstate taxable goods suppliers
- Casual taxable persons supplying goods or services temporarily
- Non-resident taxable persons conducting taxable business in India
- E-commerce operators collecting tax at source
- Persons supplying through e-commerce operators in notified categories
- Businesses liable to pay tax under reverse charge mechanism
- Input service distributors
- Tax deductors under Section 51 of CGST Act
- Agents supplying taxable goods or services on behalf of another taxable person
- Online information and database access service providers serving Indian customers
- Persons required to collect tax at source under GST provisions
| Category | Registration requirement |
|---|---|
| Interstate taxable supplier | Mandatory before supply |
| E-commerce operator | Mandatory irrespective of turnover |
| Casual taxable person | Mandatory temporary registration |
| Non-resident taxable person | Mandatory before business activity |
| Reverse charge liable person | Mandatory under GST law |
Compulsory registration under GST in India: complete category-wise list
The following table summarises major categories where compulsory GST registration applies irrespective of turnover threshold.
| Category of taxpayer | Applicability | Threshold exemption available |
|---|---|---|
| Interstate taxable goods suppliers | Mandatory registration | No |
| Casual taxable persons | Mandatory registration | No |
| Non-resident taxable persons | Mandatory registration | No |
| E-commerce operators | Mandatory registration | No |
| Persons supplying through e-commerce platforms | Mandatory in notified cases | No |
| Reverse charge taxpayers | Mandatory registration | No |
| Input service distributors | Mandatory registration | No |
| TDS deductors under GST | Mandatory registration | No |
| Agents of taxable suppliers | Mandatory registration | No |
| Online database service providers | Mandatory registration | No |
Key points businesses should know
- Interstate service providers received conditional exemptions under notifications issued by the GST Council for specified turnover limits.
- E-commerce sellers supplying through online marketplaces often require GST registration even at low turnover levels.
- Casual taxable persons must deposit estimated GST liability in advance before registration approval.
- Non-resident taxable persons receive registration for a limited validity period linked to business operations in India.
Threshold limit exemption: when does it not apply under GST?
The GST threshold exemption does not apply when a person falls under compulsory registration categories notified under Section 24 of the CGST Act.
Cases where turnover exemption becomes invalid
- Interstate taxable supply of goods
- Supply through e-commerce operators in specified categories
- Liability under reverse charge mechanism
- Non-resident taxable business activity
- Casual taxable business operations
- Input service distribution activities
- Tax collection at source obligations
- Tax deduction at source obligations
For example, a Jaipur-based handicraft seller supplying taxable goods interstate through an online marketplace must obtain GST registration even if annual turnover is Rs. 8 lakh. Section 24 overrides the standard exemption threshold in such cases.
Compulsory vs voluntary GST registration: key differences
| Parameter | Compulsory GST registration | Voluntary GST registration |
|---|---|---|
| Legal requirement | Mandatory under Section 24 | Optional |
| Turnover condition | Not applicable | Below threshold limit |
| Applicability | Specific notified categories | Any eligible business |
| GST compliance | Mandatory returns and invoicing | Mandatory after registration |
| Penalty for non-registration | Applicable | Not applicable |
| Input tax credit eligibility | Available as per law | Available as per law |
| Business expansion support | Enables interstate trade | Enables formal compliance |
| Registration timing | Before taxable supply | At taxpayer’s discretion |
Compulsory registration arises from statutory obligations, while voluntary registration is a business choice made for compliance benefits, vendor requirements, or input tax credit access.
Documents required for compulsory GST registration
Businesses applying for compulsory GST registration must upload supporting identity, address, and business proof documents on the GST portal.
Commonly required documents
- PAN card of business or applicant
- Aadhaar card of proprietor, partner, or director
- Business registration proof
- Address proof of principal place of business
- Bank account statement or cancelled cheque
- Passport-size photograph
- Authorisation letter or board resolution
- Digital signature certificate for companies and LLPs
Additional documents may apply for non-resident taxable persons or casual taxable persons depending on business structure and registration category.
How to apply for compulsory GST registration online: step-by-step
Businesses can apply for GST registration online through the official GST portal by submitting identity, address, and tax-related information.
Step 1: Visit the GST portal
Open the GST registration section and select “New Registration”.
Step 2: Enter business details
Provide PAN, mobile number, email address, and state details. OTP verification is completed for contact authentication.
Step 3: Generate temporary reference number
After OTP validation, the system generates a Temporary Reference Number (TRN) for continuing the application.
Step 4: Upload documents
Upload PAN, Aadhaar, business proof, address proof, bank details, and authorised signatory documents.
Step 5: Select registration category
Choose the relevant category such as casual taxable person, non-resident taxable person, or regular taxpayer.
Step 6: Verify application
Use Aadhaar authentication, digital signature certificate, or electronic verification code to submit the application.
Step 7: Receive GSTIN
Once approved, the Goods and Services Tax Identification Number (GSTIN) is issued electronically.
For example, a Delhi-based interstate electronics supplier with Rs. 12 lakh annual turnover must apply for registration before dispatching taxable goods outside Delhi.
Penalty for not registering under GST when compulsory registration applies
Failure to obtain GST registration when compulsory registration provisions apply can attract monetary penalties and tax recovery proceedings.
| Non-compliance | Penalty under GST |
|---|---|
| Failure to register | 10% of tax due or Rs. 10,000, whichever is higher |
| Intentional tax evasion | 100% of tax due |
| Delayed registration impact | Interest and late fee liability |
| Incorrect GST collection | Additional legal action possible |
As per GST law provisions, authorities can also restrict input tax credit claims and issue notices for recovery of unpaid tax liabilities.
Pros and cons of compulsory GST registration for businesses
Compulsory GST registration creates both compliance obligations and operational advantages for businesses.
Pros
- Enables legal interstate business operations
- Allows collection of GST from customers
- Supports eligible input tax credit claims
- Improves vendor credibility and compliance profile
- Helps businesses participate in e-commerce marketplaces
- Enables tax invoice issuance under GST law
Cons
- Increases monthly and annual return filing obligations
- Requires invoice-level record maintenance
- Creates working capital impact due to tax payments
- Non-compliance attracts penalties and notices
- Small businesses face additional accounting costs
For example, a Bengaluru-based online seller supplying products nationwide may benefit from wider market access after GST registration, but the business must maintain monthly GST return compliance and invoice records.
Conclusion
Compulsory registration under GST applies to notified persons and businesses under Section 24 of the CGST Act irrespective of turnover exemptions. Interstate suppliers, e-commerce operators, casual taxable persons, and reverse charge liable entities must register before commencing taxable operations. Proper registration helps businesses issue compliant tax invoices, claim eligible input tax credit, and avoid penalties.
Businesses handling GST liabilities, vendor payments, or expansion expenses can explore business loans for funding support. Before applying, review the applicable business loan interest rate and calculate estimated repayments using the business loan EMI calculator.
