GST Registration for Startups: When You Need It and How

Almost every founder asks the same question in the first year: do I need a GST number? The answer depends on what you sell, where you sell it and how much you earn. Getting this wrong has real costs, either a penalty for not registering when you should or needless compliance when you did not have to. This guide explains the main rules in plain English and tells you where to check the current position. GST law changes often, so treat it as a starting point.

What Is GST Registration?

Goods and Services Tax (GST) is the indirect tax on the supply of goods and services in India. When you register, you receive a GSTIN, a 15-character identification number. A registered business can charge GST on its invoices, deposit it with the government and claim credit for GST paid on business purchases. An unregistered business generally cannot do these things.

When Is Registration Required?

Based on turnover

The Central Board of Indirect Taxes and Customs (CBIC) and the Press Information Bureau describe the following turnover limits:

• For suppliers of goods, the limit was raised from Rs 20 lakh to Rs 40 lakh from April 2019. States could choose the lower Rs 20 lakh limit. A 2026 government review of GST also refers to the Rs 40 lakh figure.
• For suppliers of services, the limit remained Rs 20 lakh, or Rs 10 lakh in special category states.

Your state may apply a lower limit for goods, and the rules for businesses that supply both goods and services have their own conditions. Check the GST portal and your state tax department before relying on a limit.

Compulsory registration

Section 24 of the CGST Act lists cases in which registration is compulsory whatever the turnover. The CBIC FAQ lists, among others:

• Persons who make interstate supplies (certain rules apply differently to goods and services)
• Casual taxable persons
• Persons liable to pay tax under reverse charge
• E-commerce operators, and persons supplying goods through e-commerce operators

The CBIC FAQ pre-dates later changes. A 2026 government review says small taxpayers making intra-state supplies of goods through e-commerce operators have been exempt from mandatory registration since October 2023. Because the rules interact, read the latest notification or ask a professional if you sell on marketplaces.

Exempt supplies

The CBIC FAQ says that suppliers who deal only in wholly exempt goods or services are generally not liable to register.

Should You Register Even If You Are Below the Limit?

Sometimes yes. Reasons founders choose voluntary registration:

• Business customers often want GST invoices so they can claim credit
• You want to claim credit on the GST you pay for equipment and services
• Marketplaces, large buyers and some tenders ask for a GSTIN
• You plan to sell across states

Voluntary registration also brings obligations, such as regular returns. Make the decision with an accountant.

What Documents Will You Need?

The portal lists current requirements, and they vary by constitution of the business. As a general guide, keep these ready:

• PAN of the business or proprietor
• Company or LLP documents, such as certificate of incorporation
• Identity and address details of directors or partners
• Proof of the place of business, such as an electricity bill or rent agreement with a consent letter
• Bank account details
• A mobile number and email address for verification
• Digital signature, where the entity type requires it

Step by Step: How to Register

The GST portal offers a user manual and quick videos for the process, including “Applying for GST Registration – Part A” and “Part B”. In outline:

1. Part A. Enter the basic details (such as PAN, mobile number and email) and verify them. You receive a temporary reference number.

2. Part B. Use the reference number to log in and fill in the full application: business details, promoters, place of business, goods or services and bank details. Upload the documents.

3. Submit with the required authentication, such as an e-signature or an OTP-based verification, depending on your entity type.

4. Track the application with the application reference number the portal gives you. The officer may ask for more information.

5. Receive your GSTIN and certificate, and start issuing GST invoices.

Always follow the current instructions on the portal, because screens and rules change.

After You Register

Registration is only the start. You will need to:

• Issue proper tax invoices
• File periodic GST returns on time, even when there is no activity
• Keep records of purchases, sales and tax credit
• Display your GSTIN at your place of business, as the law requires

Late filing attracts fees and interest, so set calendar reminders from day one, or ask your accountant to manage it.

GST and Other Registrations

GST registration is separate from company registration, DPIIT recognition and Udyam registration. The Udyam portal asks for GSTIN where GST applies. To set up your company first, read our private limited company registration guide.

Simplified Registration Option (Rule 14A)

From 1 November 2025 the GST registration form on the portal includes an option described as the simplified registration scheme under Rule 14A. According to the GST Council newsletter (October 2025 issue), it is meant for taxpayers whose monthly output tax liability on supplies to registered persons (B2B supplies) is up to Rs 2.5 lakh. The GST portal user guide says that if you choose it you must also choose Aadhaar authentication, you must tick a declaration, and only one such registration is allowed per PAN in a State or Union Territory. The newsletter says registration is granted electronically within three working days after successful Aadhaar authentication, and that you can later withdraw from the option using Form GST REG-32.

Whether the option suits your business depends on your own supplies and liability, so read the conditions on the portal itself before you tick it. If you are unsure, check the GST portal for the current simplified registration options or ask a qualified professional.

Common Mistakes

• Assuming startup status means no GST. DPIIT recognition does not exempt you from GST rules.
• Looking only at the turnover limit. Interstate and e-commerce cases may need registration regardless of turnover.
• Using an old threshold. Articles from before 2019 mention lower limits for goods.
• Not filing returns because there was no sale. Registered businesses generally need to file even when there is no activity.
• Using paid portals. Apply on the official GST portal only.
• Mixing personal and business bank accounts, which complicates records.

Frequently Asked Questions

Do I need GST registration to start selling?

Not always. It depends on your turnover, what you supply, where you supply it and whether you sell through e-commerce operators. Check the compulsory cases above.

Is there a government fee to register?

The sources we reviewed do not state a government fee for GST registration. Confirm on the portal, and be careful with anyone who charges large sums to apply on your behalf.

Can I cancel or change my GST registration later?

Yes, the portal provides processes for amendment and cancellation. Follow the instructions there and file all returns first.

Where to Go Next

Browse the Startup India guides hub, or read the list of DPIIT-recognised startup benefits.

Last checked: 27 October 2026 against CBIC FAQs, a Press Information Bureau note and a 2026 PIB review of GST, plus the GST portal user guide and the GST Council newsletter (October 2025). This is general information, not legal, tax or financial advice. GST rules and thresholds are amended often, so confirm on gst.gov.in or with a qualified professional.

Official Sources

• GST Portal: Registration
• GST Portal: Registration user manual and tutorials
• CBIC GST: Frequently Asked Questions
• Press Information Bureau: GST Council decisions for the MSME sector
• Press Information Bureau: Nine Years of GST (30 June 2026)
• GST Portal: Apply for Registration (Normal Taxpayer) user guide, including the Rule 14A option
• GST Council newsletter, October 2025 issue (Notification 18/2025-Central Tax summary)