GST Registration Process Online: Step-by-Step Guide

The GST registration process online is free, done entirely on the GST portal, and usually completes within a week or two if your documents are in order. Registration gives you a 15-digit GSTIN, lets you collect tax and claim input tax credit, and is legally required once you cross the threshold or fall into a compulsory category. This guide explains who must register, which documents to keep ready, each step of the application, how Aadhaar authentication affects timelines, and the reasons applications get rejected.

Who needs GST registration

Turnover thresholds

Type of supplier	Most states	Special category states (some)
Exclusively goods	Aggregate turnover above ₹40 lakh (in states that adopted the higher limit)	₹20 lakh or ₹10 lakh depending on the state
Services, or goods and services	Aggregate turnover above ₹20 lakh	₹10 lakh in certain states

Aggregate turnover is computed on an all-India basis for the same PAN and includes taxable, exempt, export and inter-state supplies, but excludes GST itself and inward supplies taxed under reverse charge. Thresholds vary between states, so check the limit applicable to your state.

Compulsory registration regardless of turnover

• Persons making inter-state taxable supplies of goods (service providers making inter-state supplies are exempt up to the threshold).
• Persons liable to pay tax under reverse charge.
• Casual taxable persons and non-resident taxable persons.
• Suppliers selling goods through e-commerce operators who collect TCS, subject to relaxations notified for small intra-state sellers.
• E-commerce operators, Input Service Distributors, and persons required to deduct TDS or collect TCS under GST.
• Agents supplying on behalf of other taxable persons.
• Suppliers of online information and database access services from outside India to unregistered persons in India.

Voluntary registration

Businesses below the threshold can register voluntarily. This makes sense if your customers are registered businesses that want credit, or if you buy a lot of taxable inputs and want credit yourself. Once registered, you must file returns even if turnover stays low.

Documents required

Business type	Key documents
Proprietorship	PAN and Aadhaar of proprietor, photograph, proof of business address, bank account proof
Partnership firm / LLP	PAN of firm, partnership deed or LLP agreement, PAN and Aadhaar of partners, photographs, authorisation for signatory, address and bank proof
Company	PAN of company, certificate of incorporation, MOA/AOA, PAN and Aadhaar of directors, board resolution for authorised signatory, address and bank proof

Proof of principal place of business can be a recent electricity bill, property tax receipt or municipal khata for owned premises; a rent or lease agreement plus a utility bill for rented premises; or a consent letter plus the owner's proof for premises provided by a relative or friend. Bank proof can be the first page of the passbook, a cancelled cheque or a bank statement showing the account holder's name and IFSC. Bank details can now be added after registration within the time allowed.

The GST registration process online: step by step

Part A: generating the TRN

1. Go to the GST portal, choose Services, Registration, New Registration.
2. Select "Taxpayer" as the type, choose your state and district, and enter the legal name exactly as in PAN, the PAN, email and mobile number.
3. Verify with the OTPs sent to the email and mobile. The portal generates a Temporary Reference Number (TRN), valid for 15 days to complete Part B.

Part B: filling the application (REG-01)

1. Log in with the TRN and open the saved application.
2. Business details: trade name, constitution, date of commencement, reason for registration, and whether you are opting for composition.
3. Promoters or partners: personal details, photograph and identity proof for each.
4. Authorised signatory: the person who will sign returns, with authorisation proof.
5. Principal place of business: address, nature of possession and proof. Add additional places of business in the same state if any.
6. Goods and services: top goods (by HSN) and services (by SAC) you deal in.
7. Bank accounts and state-specific information if requested.
8. Aadhaar authentication: choose whether to authenticate the promoter and signatory through Aadhaar. In many states, applicants are also called for biometric authentication and document verification at a GST Suvidha Kendra.
9. Verification: submit with DSC (mandatory for companies and LLPs) or EVC. The portal issues an Application Reference Number (ARN).

What happens after submission

Scenario	Typical timeline
Aadhaar authenticated, no risk flags	Approval generally within 7 working days
Physical verification or biometric verification needed, or Aadhaar not opted	Up to 30 days
Officer seeks clarification (REG-03)	Reply in REG-04 within 7 working days; decision follows

A simplified registration route for small, low-risk applicants with faster approval was introduced as part of the 2025 reforms. Check the portal for current eligibility. Once approved, download the registration certificate (REG-06) from the dashboard and display the certificate and GSTIN at your place of business.

Understanding your GSTIN

A GSTIN has 15 characters. For example, in 29ABCDE1234F1Z5, the first two digits (29) are the state code for Karnataka, the next ten (ABCDE1234F) are the PAN, the thirteenth (1) is the entity number for that PAN in the state, the fourteenth is Z by default, and the last is a check character. This structure is why the same PAN gets a different GSTIN in each state.

Common reasons for rejection or queries

• Address proof does not match the address entered, or the utility bill is old or in another person's name without a consent letter.
• Rent agreement unsigned, unstamped or expired.
• Photograph or documents unclear or in the wrong format.
• Name mismatch between PAN and the application.
• Premises found closed or non-existent during physical verification.
• Incorrect HSN or SAC for the business activity.

Respond to a REG-03 notice quickly, upload clearer documents and explain the business activity in plain language.

After registration: first 30 days

1. Set up invoice numbering per financial year and print GSTIN on invoices. Use our invoice format checklist.
2. Choose the return frequency: monthly or QRMP if turnover is up to ₹5 crore.
3. Note return due dates and file returns from the effective date of registration, even if nil.
4. Issue revised invoices for sales made between the effective date and the date of the certificate, within the permitted time.
5. Decide between composition and regular schemes if eligible; see composition versus regular GST.
6. Update your customers and suppliers with the GSTIN so purchase invoices carry it and credit appears in GSTR-2B.

Registration in special situations

Selling online through marketplaces

Sellers supplying goods through e-commerce operators that collect TCS were historically required to register regardless of turnover. Relaxations introduced in 2023 allow small sellers below the threshold to supply goods within their own state through such operators without registration, subject to conditions such as having a PAN and declaring a single state. Inter-state online sales still generally need registration. Check the current conditions before relying on the relaxation.

Operating in more than one state

If you open a warehouse or office in another state and make supplies from there, you need a separate registration in that state. Apply through the same portal flow with the new state selected. Stock transfers between the two registrations are then invoiced with IGST.

Casual taxable person

If you participate in a trade fair or exhibition in another state where you have no fixed place of business, you register as a casual taxable person for up to 90 days (extendable), and you must deposit an advance amount equal to the estimated tax liability before registration is granted.

Multiple business verticals

Within one state, a business can choose to take separate registrations for different places of business. This can help when divisions keep separate books, but each registration then files its own returns and supplies between them become taxable.

Amending your registration later

Business details change: you move premises, add a partner or change the authorised signatory. GST distinguishes two kinds of amendment:

Type	Examples	Approval
Core fields	Legal name (without change of PAN), principal or additional place of business, addition or removal of partners or directors	Filed in REG-14 and approved by the officer
Non-core fields	Email, phone, bank account, authorised signatory, goods and services list	Updated without officer approval

A change of PAN, for example converting a proprietorship into a company, requires a fresh registration, not an amendment. Apply for amendments within 15 days of the change, and keep the supporting documents ready as you would for a new application.

Keeping registration active

Registrations can be suspended or cancelled by the department if returns are not filed for a continuous period, if the business is not found at the declared address, or if there are serious mismatches between returns. A suspended registration blocks e-way bill generation and can stop your customers' credit. File every return on time, even nil returns, and respond quickly to any REG-17 show cause notice. If your registration is cancelled for non-filing, you can apply for revocation within the time allowed after filing all pending returns.

How Fininvo helps after you register

Once you have a GSTIN, Fininvo ERP lets you set up GST-compliant invoices with automatic CGST, SGST and IGST, HSN and SAC mapping and return data generated from your transactions. See Fininvo ERP, invoicing and pricing.

General information, not legal or tax advice. Thresholds and procedures differ by state and change by notification; consult your CA.

Frequently Asked Questions

Is there a government fee for GST registration?

No. GST registration on the portal is free. You may pay a professional if you take help with documentation.

Can I register with a residential address?

Yes, if business is actually conducted from there and you have valid address proof. Many freelancers and small traders register from home.

Do I need a separate GSTIN for each state?

Yes. You need a registration in each state or union territory from which you make taxable supplies. Within a state, additional places of business can be added to one registration.

How long does GST registration take?

Usually about 7 working days when Aadhaar authentication succeeds and no verification is needed, and up to 30 days where physical or biometric verification is required.

Can I cancel GST registration later?

Yes. You can apply for cancellation in REG-16 if you close the business or turnover falls below the threshold and you are not otherwise required to stay registered. A final return in GSTR-10 is required after cancellation.