GST Registration in India: Who Needs It, Documents, Process and Common Mistakes

Quick answer: Most businesses must register for GST once their aggregate annual turnover crosses ₹40 lakh (supply of goods only) or ₹20 lakh (services), with lower limits in some special category states. Some businesses must register regardless of turnover, such as those making inter-state supplies of goods or selling through many e-commerce platforms. Registration on the official GST portal is free. With correct documents and Aadhaar authentication, approval often comes within about 7 working days.

Goods and Services Tax (GST) registration gives your business a 15-character GSTIN. It lets you collect GST from customers, claim input tax credit on your purchases, and work with larger companies that only buy from registered suppliers. This guide explains, in plain language, who needs to register, what you need, and how to avoid the mistakes that cause delays.

1. Who must register for GST?

Based on turnover

Registration becomes compulsory when your aggregate turnover in a financial year crosses the threshold. Aggregate turnover is the total value of all taxable, exempt and export supplies across India under the same PAN, excluding GST itself.

Type of business	Threshold in most states	Special category states (lower limits)
Only supply of goods	₹40 lakh	₹20 lakh in some states
Services, or goods and services	₹20 lakh	₹10 lakh in some states

The higher ₹40 lakh limit for goods does not apply in every state, and the lower limits apply in certain north-eastern and hill states. Check the current limit for your state on the GST portal or with your CA.

Compulsory registration regardless of turnover

Some businesses must register even if their turnover is small, including:

• Businesses making inter-state supplies of goods (selling goods to a buyer in another state). Service providers have relief up to the turnover limit.
• Many sellers who supply goods through e-commerce platforms that collect tax at source, although relief has been given to some small sellers. Check the current rules for your case.
• Casual taxable persons, such as traders at a temporary exhibition in another state.
• Businesses required to pay tax under reverse charge.
• Non-resident taxable persons, input service distributors and e-commerce operators.

Voluntary registration

You can register voluntarily even below the limit. This makes sense if your customers are mostly GST-registered businesses that want input tax credit, or if you want to sell on platforms that require GST. The trade-off is monthly or quarterly return filing even in months with no sales.

2. Documents you need

The exact list depends on your business type. For most small businesses:

Business type	Main documents
Proprietorship	PAN and Aadhaar of the owner, photo, address proof of place of business, bank account proof
Partnership firm	Firm PAN, partnership deed, PAN, Aadhaar and photos of partners, authorisation letter, address proof, bank proof
LLP	LLP PAN, incorporation certificate, LLP agreement, details of designated partners, board resolution or authorisation, address proof, bank proof
Private limited company	Company PAN, certificate of incorporation, MOA/AOA, details of directors, board resolution for authorised signatory, address proof, bank proof

Proof of place of business

• Own premises: latest electricity bill, property tax receipt or municipal khata copy.
• Rented premises: rent agreement plus an electricity bill or property tax receipt of the owner, and often a No Objection Certificate (NOC) from the owner.
• Shared or relative's premises: consent letter or NOC from the owner with their address proof.

Bank proof

A cancelled cheque, the first page of the passbook, or a bank statement showing the account holder's name, account number and IFSC. The account should be in the name of the business (or the proprietor for a proprietorship).

3. Step-by-step process on the GST portal

1. Part A: Go to the official GST portal and choose New Registration. Enter the legal name as per PAN, PAN, state, email and mobile number. Verify with the OTPs. You receive a Temporary Reference Number (TRN).
2. Part B: Log in with the TRN and fill in business details, promoters or partners, authorised signatory, principal place of business, additional places (if any), goods and services you deal in (HSN/SAC codes) and bank details. Upload the documents.
3. Aadhaar authentication: Opt for Aadhaar authentication. The promoters receive a link and OTP to authenticate. In some states, biometric verification at a GST Suvidha Kendra may be required.
4. Verification and submission: Submit with DSC (for companies and LLPs) or EVC (OTP). You receive an Application Reference Number (ARN) to track the status.
5. Officer review: The tax officer may approve it, or raise a query asking for clarification or documents. Reply within the given time.
6. Approval: Once approved, you can download the registration certificate from the portal.

How long does it take?

If Aadhaar authentication is completed and the documents are clear, approval often comes within about 7 working days. If the officer decides physical verification of the premises is needed, or raises a query, it can take up to around 30 days.

4. Common mistakes that cause rejection

• Name mismatch: the legal name must exactly match the PAN.
• Unclear or old address proof: blurred scans, expired rent agreements, or bills in a different name without an NOC.
• Wrong place-of-business photos or no signboard where required.
• Incorrect HSN/SAC codes for what you actually sell.
• Skipping Aadhaar authentication, which often triggers physical verification and delay.
• Not replying to the officer's query on time, which can lead to rejection.

5. What happens after registration

Registration is the start. You now have ongoing compliance:

• Display the GSTIN on your signboard and invoices.
• Issue proper tax invoices with your GSTIN, customer details, HSN/SAC, tax rate and tax amount.
• File returns: regular taxpayers usually file GSTR-1 (sales details) and GSTR-3B (summary and tax payment). Small taxpayers can choose the quarterly QRMP scheme, which still requires monthly tax payment.
• Annual return: required above certain turnover limits; check current rules.
• Keep records of invoices, purchases and payments.

Late filing attracts late fees and interest, and long non-filing can lead to cancellation of registration. Even if you had no sales in a period, you usually need to file a nil return.

6. Composition scheme: a simpler option for small businesses

Small businesses can opt for the composition scheme, which allows tax at a low fixed rate on turnover with simpler quarterly payment and an annual return. Limits apply: generally up to ₹1.5 crore turnover for most goods businesses (lower in special category states) and a lower limit for service providers. Composition dealers cannot collect GST from customers, cannot claim input tax credit, and cannot make inter-state supplies of goods. It suits small traders selling mainly to consumers, not businesses that sell to other GST-registered companies.

7. Should you hire a CA or GST practitioner?

Registration on the portal is free, and many proprietors do it themselves. A professional is worth it if:

• You are a company, LLP or partnership with several directors or partners.
• Your premises situation is complicated (shared, rented from a relative, home office).
• You need help choosing between regular and composition schemes.
• You want someone to handle monthly returns and reconciliations afterwards.

When choosing a professional, ask for their ICAI membership number (for a CA) or GST practitioner enrolment, agree the fee in writing, and make sure the portal login is created with your email and mobile number, not theirs. Many small businesses get stuck later because a former consultant controls their GST login.

8. Understanding aggregate turnover with examples

Many small businesses get confused about whether they have crossed the limit. Remember that aggregate turnover is calculated on an all-India basis for the same PAN and includes exempt supplies too.

• Example 1: A consultant in Indore earns ₹15 lakh a year from services. They are below the ₹20 lakh services threshold and do not need to register unless another rule applies, such as selling through certain e-commerce channels.
• Example 2: A trader sells only goods within the state, with turnover of ₹32 lakh. In a state where the ₹40 lakh goods limit applies, registration is not yet compulsory. In a state where the lower limit applies, it is.
• Example 3: A shop sells goods worth ₹12 lakh within the state and also ships ₹50,000 of goods to a customer in another state. Inter-state supply of goods generally requires registration regardless of turnover.
• Example 4: A business sells both goods and services. The services threshold of ₹20 lakh generally applies to the combined turnover.

When in doubt, ask a professional to check your case. Registering late, after crossing the limit, can lead to tax demands on past sales plus interest.

9. Choosing the right HSN and SAC codes

During registration, you list the main goods (HSN codes) and services (SAC codes) you deal in. These codes also go on your invoices. Choosing wrong codes can lead to wrong tax rates and later disputes. Use the search facility on the GST portal, check the codes your suppliers use for similar items, and ask your CA if a product could fall under more than one code.

10. Your GST login: protect it like a bank account

The GST portal login controls your returns, refunds and notices. Follow these practices:

• Register with your own email and mobile number, not your consultant's.
• Use a strong password and change it when you change consultants or staff.
• Check the portal yourself every month for notices, even if a consultant files returns.
• Keep copies of the registration certificate and every return acknowledgement.

11. Invoicing basics after registration

A valid tax invoice generally includes:

• Your name, address and GSTIN.
• A unique, serially numbered invoice number and date.
• The customer's name and address, and GSTIN if registered.
• Description of goods or services with HSN/SAC codes.
• Quantity, value, tax rate and tax amounts (CGST and SGST for intra-state sales, IGST for inter-state sales).
• Place of supply.
• Signature or digital signature.

Larger businesses above a set turnover must generate e-invoices through the government's invoice registration system. Check whether this applies to you as your turnover grows.

12. Input tax credit: why many businesses register

Input tax credit (ITC) lets you reduce the GST you pay on sales by the GST you paid on business purchases, subject to conditions. To claim ITC, your supplier must have filed their returns and the invoice must appear in your auto-generated statement on the portal. This is why reconciling purchase data every month matters. Choosing suppliers who file returns on time protects your credit.

13. Physical verification: how to prepare

If an officer decides to visit your premises before approving registration, make sure:

• The business name is displayed at the address.
• Someone authorised is present with original documents.
• The premises match what you described: a shop, office or warehouse.

Physical verification is routine in some cases and is not a sign of trouble if your details are genuine.

Frequently asked questions

Is there a government fee for GST registration?

No. Registration on the official GST portal is free. Professionals charge only for their service.

Can I register using my home address?

Yes, if you actually run the business from home, using your home's address proof. If the home is owned by a family member, you will usually need their consent letter or NOC.

Can one PAN have multiple GST registrations?

Yes. You need a separate registration in each state where you have a place of business, and you can get multiple registrations within a state for different business verticals or places, subject to the rules.

Can I cancel GST registration if business closes?

Yes, you can apply for cancellation on the portal. Pending returns and dues must be settled.

GST rules, limits and due dates change regularly. This guide is general information, not tax advice. Confirm the current rules on the official GST portal or with a qualified professional.