GST registration online: get your GSTIN and start invoicing.
ZegalWorks handles GST registration end to end for businesses in Chennai, across Tamil Nadu and the rest of India, so you can issue tax invoices, claim input tax credit and sell with confidence.
What is GST registration?
GST (Goods and Services Tax) registration gives your business a 15-character GSTIN. With it you can charge GST on invoices, claim input tax credit on your purchases, and work with clients who require a GST-registered supplier.
Registration is mandatory in some situations and optional in others. Thresholds and rules can change, so we check the current position for your business instead of applying a rule of thumb.
The first two characters of a GSTIN are the state code (33 for Tamil Nadu), followed by the PAN of the business. Registration is state-wise: if you supply goods or services from more than one state, you generally need a registration in each of those states. There is no government fee for applying on the GST portal; our fee covers preparation, filing and follow-up.
Not sure whether you need it yet? Read our guide to GST for MSMEs, or compare the monthly return obligations that follow registration.
Who this is for
A good fit if you
- Cross the GST turnover threshold for goods or services
- Sell across state lines or through online marketplaces, where the rules may require registration
- Want to claim input tax credit on business purchases
- Have business clients who ask for a GSTIN
Something else may suit you better if
Your turnover is below the threshold and you have no mandatory trigger. Registration may be optional for now.
You make only tax-exempt supplies. Registration may not apply.
Your turnover is small and you sell goods locally. The composition scheme may be an option once registered.
What you need
We confirm the exact list for your situation during your free consultation.
- When it is mandatory
- Generally once annual turnover crosses ₹40 lakh for goods or ₹20 lakh for services (limits differ in some states and for some categories). Some suppliers, such as certain inter-state suppliers and certain e-commerce sellers, may need to register regardless of turnover, subject to exemptions. Rules change, so we confirm the current position.
- PAN and Aadhaar
- PAN of the business or proprietor, and Aadhaar of the proprietor, partners or directors.
- Business proof
- Certificate of incorporation, partnership deed or similar, depending on your structure.
- Address proof
- Ownership document or rent agreement with NOC and a recent utility bill for the business address.
- Bank details
- Cancelled cheque or bank statement of your business account.
- Authorised signatory
- Photograph, and digital signature or EVC for filing.
How GST registration works on the GST portal
This is the government process we prepare and file for you. The steps are the same for a proprietor, partnership, LLP or company, but the documents and signatory differ.
- Part A. Enter the PAN, mobile number and email of the business on the GST portal and verify them with OTPs. The portal issues a Temporary Reference Number (TRN).
- Part B. Using the TRN, fill in business details, promoters or partners, places of business, bank account and goods or services, and upload the supporting documents.
- Verify. Sign the application with a digital signature (DSC) or an e-verification code (EVC), depending on your type of business. Aadhaar authentication is part of this step for the persons named in the application.
- ARN. After submission you receive an Application Reference Number (ARN). You can track the application on the portal with it.
- Officer review. A tax officer reviews the application. If more information is needed, a notice is issued and you must reply within the time it allows.
- Certificate. On approval, the registration certificate (Form GST REG-06) with your GSTIN is issued. You then display it at your place of business and start issuing GST invoices.
Some applicants are approved faster. Since 1 November 2025 the CGST Rules provide for registration within 3 working days for applicants who clear the portal’s risk screening (Rule 9A), and for an Aadhaar-authenticated simplified option for small taxpayers with monthly output tax liability on B2B supplies of up to ₹2.5 lakh (Rule 14A). Whether either route applies depends on the portal’s assessment of your application, so we confirm it before filing.
GST registration for businesses in Chennai and Tamil Nadu
GST registration is applied for online on the national GST portal, so you do not need to visit an office to start. A registration for your Tamil Nadu place of business carries the state code 33 at the start of the GSTIN.
In Tamil Nadu, the portal can ask an applicant to complete biometric Aadhaar authentication and document verification at a GST Suvidha Kendra before the ARN is generated. The email you receive from the portal tells you whether this applies to your application. If it does, we prepare the originals you need to carry and guide you through booking the appointment.
GST is only one of the registrations a new Tamil Nadu business may need. Shops and Establishments registration, a local trade licence and professional tax are decided at state or local-body level; see our state-wise guides for Tamil Nadu and Puducherry. If you are setting up a company at the same time, start with Private Limited Company registration.
Common reasons a GST application is queried
- Name or address on the application does not match the PAN, Aadhaar or address proof.
- Rented premises without a rent agreement and the owner’s consent (NOC), or a utility bill that is not recent.
- Business activity or goods and services described too vaguely, or not matching the constitution of the business.
- Bank account details missing or not in the name of the business or proprietor.
- Authorised signatory details, photograph or DSC not matching what the portal requires.
We check these points before we file, so the first submission is as complete as possible.
What ZegalWorks handles for you
- Assess. We check whether you need GST now and which option suits you.
- Prepare. We collect documents and verify details match across PAN, Aadhaar and address proof.
- File. We submit the registration application on the GST portal.
- Follow up. We respond to any officer queries or verification requests.
- Start. You receive your GSTIN, and we explain invoicing and monthly filing.
How long it takes and what it costs
Actual timing depends on how quickly documents are ready and on the processing time of the authority involved.
Your total cost has two parts: our professional fee, and any government or statutory fees that apply. Government fees are set by the authority and vary by case, so we give you an itemised quote before you commit to anything. GST registration is included in our Starter package. See our pricing page for packages, or our Partner Plans if you also want monthly returns and accounting handled.
Get a Tailored QuoteRelated services
Most businesses need more than one of these. They are all handled by the same ZegalWorks team.
Frequently Asked Questions
Direct answers to the questions we hear most.
Where these rules come from
GST rules, thresholds and procedures are set by the GST Council, the CBIC and the GST portal, and they change often. Check the current text at the source.
- GST Portal, the official site for registration, returns and notices
- New registration on the GST portal
- GST portal help: registration
- GST Council newsletter, October 2025, summarising Notification No. 18/2025-Central Tax (Rules 9A and 14A)
- CBIC GST: CGST Act, CGST Rules and notifications
Last checked against these sources on 23 October 2026. This page is general information, not legal or tax advice, and we confirm how the rules apply to your business before filing.
Ready to get started?
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