If you run a business in India, sooner or later you will hear the question: do you have a GSTIN? GST registration gives your business a unique 15-digit Goods and Services Tax Identification Number, lets you collect tax from customers, and lets you claim credit on the tax you pay on purchases. This guide explains who needs to register, what you need before you start, and how the process works on the GST portal, step by step.

What is GST registration?

GST registration is the process of enrolling your business with the GST system so that it can legally charge and report Goods and Services Tax. Once registered, you receive:

• A GSTIN, a 15-digit number unique to your business in each state.
• A registration certificate, which you should display at your place of business.
• Access to input tax credit, which lets you offset the GST you paid on purchases against the GST you collect.
• The ability to issue tax invoices and file returns on the GST portal.

The registration is linked to your PAN and the state where your business operates. If you operate from more than one state, you need a separate registration in each.

Who needs to register for GST?

Registration is required once your aggregate turnover crosses the threshold set for your state and the kind of supply you make. For a general category state such as Karnataka, the threshold is generally Rs 40 lakh for businesses supplying goods and Rs 20 lakh for businesses supplying services. Special category states have lower thresholds, and the figures can be revised, so always check the current notification.

Some businesses must register regardless of turnover. Common cases include:

• Businesses that sell goods or services through an e-commerce platform, in most cases.
• Persons who are required to pay tax under the reverse charge mechanism.
• Casual taxable persons and non-resident taxable persons.
• Businesses that must deduct or collect tax at source.
• Input service distributors.

You can also register voluntarily even if you are below the threshold. Many small businesses do this because registration lets them claim input tax credit and sell to larger buyers, who usually prefer GST-registered suppliers.

If you are not sure whether you must register, a short review of your turnover and the kind of supplies you make is enough to settle the question.

What you need before you start?

Keep these ready before you open the GST portal. A separate post covers the full document list for Bangalore, but the basics are:

• PAN of the business or the proprietor.
• Mobile number and email address that you can access, because the portal sends one-time passwords to both.
• Proof of business constitution, such as a partnership deed, a certificate of incorporation or an LLP agreement.
• Identity and address proof of the promoters, partners or directors, with passport-size photographs.
• Proof of the place of business, such as a rent agreement with the owner’s consent letter, or a property tax receipt or electricity bill if you own the premises.
• Bank account details, such as a cancelled cheque or a bank statement showing the account name and number.
• Aadhaar of the authorised signatory, which is used for authentication.
• Digital Signature Certificate (DSC) if you are registering a company or LLP.

The GST registration process, step by step

The process runs in two parts on the GST portal, www.gst.gov.in.

Step 1: Start Part A of the application

On the portal, go to Services > Registration > New Registration. Select that you are applying as a taxpayer, choose your state and district, enter the legal name of the business as it appears on your PAN, and enter your PAN, email and mobile number. The portal sends separate one-time passwords to your mobile and email to verify them.

Step 2: Receive your Temporary Reference Number

Once the one-time passwords are verified, the portal issues a Temporary Reference Number (TRN). Keep it safe, because you need it to return to the application. The TRN is valid for a limited period, so complete Part B soon.

Step 3: Complete Part B

Log in with your TRN and the one-time password sent to your mobile. Part B asks for the full details of your business:

• Trade name, constitution and the date your business started.
• Details of promoters, partners or directors.
• Principal place of business and any additional places.
• Goods and services you deal in, with HSN and SAC codes.
• Bank account details.
• Authorised signatory.

Step 4: Upload documents

Upload the documents you gathered earlier in the format the portal accepts. Keep each file within the size limit shown on the screen, and check that names and addresses match across documents, because mismatches are the most common reason for queries.

Step 5: Verify and submit

Review every field, then verify the application. Companies and LLPs sign with a Digital Signature Certificate. Others can sign using an Aadhaar-based electronic signature or an Electronic Verification Code sent to their registered mobile number.

Step 6: Aadhaar authentication

The portal asks the authorised signatory to authenticate Aadhaar. In some cases the officer may ask for a biometric authentication or a physical verification of the premises. If so, you may be asked to book an appointment at a GST Seva Kendra.

Step 7: Receive your ARN and track the application

After submission, the portal issues an Application Reference Number (ARN) by email and SMS. Use it to track your application under Services > Registration > Track Application Status.

Step 8: Respond to queries, if any

If the officer needs more information, you will receive a notice asking for clarification or additional documents. Reply within the time stated, through the portal, with clear supporting documents. Replying promptly and accurately is the best way to avoid a rejection.

Step 9: Receive your GSTIN and certificate

When the officer approves the application, the portal issues your GSTIN and registration certificate, which you can download. Processing usually takes a few working days, though it can take longer if the officer raises queries or asks for verification.

There is no government fee for GST registration.

Choosing between the regular scheme and the composition scheme

Small businesses below a prescribed turnover limit can opt for the composition scheme, which allows them to pay tax at a lower fixed rate and file simpler returns. The trade-offs matter:

• Composition taxpayers cannot claim input tax credit.
• They cannot charge GST separately on invoices.
• They generally cannot make interstate supplies of goods.

If your customers are businesses that need input tax credit, the regular scheme is usually the better choice. Decide before you register, because switching later is possible but needs a formal process.

What happens after registration?

Registration is the start of an ongoing responsibility. Once you have a GSTIN, you need to:

• Issue proper tax invoices that follow GST rules.
• File GSTR-1, which reports your sales, and GSTR-3B, a summary return where you pay tax. Businesses with lower turnover can choose the quarterly return scheme.
• File an annual return, GSTR-9, where applicable.
• Reconcile your purchases with the data your suppliers file, so that the input tax credit you claim is correct.

Late filing attracts late fees and interest, and repeated non-filing can lead to cancellation of your registration. A simple monthly routine for invoices, reconciliation and filing prevents most problems.

Common mistakes to avoid

• Mismatched details. The name, address and PAN details on your documents should match what you enter on the portal.
• Incomplete place-of-business proof. A rent agreement without the owner’s consent letter is a frequent cause of queries.
• Wrong business activity codes. Choose HSN or SAC codes carefully, because they affect your invoices and returns.
• Missing the reply deadline on a notice. An unanswered query can lead to rejection.
• Not registering when required. Operating above the threshold without registration can lead to a penalty and the tax payable, and you cannot claim input tax credit for the period.
• Using an email or mobile number you do not control. All portal notices and one-time passwords go to them.

When to get professional help?

Many businesses can complete the application themselves. Professional help is useful when:

• You are not sure whether you must register or which scheme suits you.
• You operate from more than one state, or sell through e-commerce platforms.
• Your documents have mismatched names or addresses.
• You have received a query or rejection notice.
• You want filings and reconciliation handled monthly after registration.

Muralidhar & Naveena Associates, a chartered accountant firm in Rajajinagar, Bangalore, handles GST registration, monthly and annual return filing, and input tax credit advice for businesses across Bangalore. You can read more on our GST registration and filing services page, or see how we work with taxation clients more broadly. If you are setting up a new business, our company registration services cover the registrations that come before GST.

For help from a local team, visit our Chartered Accountant in Rajajinagar page or contact us.

Frequently asked questions

• Is there a fee for GST registration? No. The government does not charge a fee. If you use a professional, you pay their fee for the service.
• How long does GST registration take? It typically takes a few working days if the documents are in order. Queries, verification or mismatched details can make it longer.
• Can I register for GST without a physical office? In some cases, yes, for example when you operate from a home address with the right consent documents. The portal needs valid proof of the place of business.
• Do I need a separate GST registration for each state? Yes. If you supply goods or services from more than one state, you need a registration in each state where you operate.
• What happens if I do not register when I should? You may have to pay the tax due along with a penalty and interest, and you cannot claim input tax credit for that period.
• Can I cancel my GST registration later? Yes, if you close the business, change its structure or fall below the threshold in the cases the law allows. Cancellation needs an application and the settlement of any dues.