You’ve just launched your business, a client asks for your GSTIN, and suddenly you’re staring at a government portal you’ve never seen before, wondering where to even click first. It’s a frustrating position, and it’s more common than you’d think. The GST registration process looks complicated from the outside, but it follows a clear, logical sequence once you understand what the portal is actually asking at each step.
At CAK & Associates LLP, a Pune-based chartered accountancy firm with decades of experience in tax compliance, we’ve handled GST registrations across a wide range of industries and entity types. And while professional support is always available, understanding the process yourself means you’re never entirely dependent on someone else to manage your own compliance. By the end of this guide, you’ll know exactly who needs to register, what documents to collect, and how to complete the GST registration process on gst.gov.in from start to GSTIN without getting stuck.
Who actually needs to register: understanding GST eligibility
GST registration is triggered primarily by your aggregate annual turnover crossing a prescribed threshold. The word “aggregate” matters here: it includes all your taxable supplies, exempt supplies, exports, and inter-state supplies combined, not just the revenue you pay GST on. So even if most of what you sell is exempt, your total turnover still counts toward the threshold.
Turnover thresholds: goods, services, and special-category states
For businesses supplying goods in most Indian states, the threshold is ₹40 lakh per financial year. For services, it’s ₹20 lakh. If your business is in a special-category state such as Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim, Tripura, Himachal Pradesh, or Uttarakhand, the thresholds drop to ₹20 lakh for goods and ₹10 lakh for services. Cross your relevant threshold at any point in the year, and registration becomes mandatory. Check the latest CBIC notifications on gst.gov.in to confirm current threshold mappings and any state-wise changes for your financial year.
Categories that must register regardless of turnover
Several business types are required to obtain a GSTIN before they make a single taxable supply, regardless of how small their turnover is. Inter-state suppliers must register the moment they begin selling across state lines. E-commerce sellers, e-commerce operators, casual taxable persons, and non-resident taxable persons all fall into this mandatory category. Persons liable to pay tax under the reverse charge mechanism, as well as entities required to deduct TDS or collect TCS under GST, must also register unconditionally. If you want to claim input tax credit even though your turnover is below the threshold, voluntary registration is permitted and often worth considering from day one.
GST registration process: documents required before you open the portal
The single biggest reason GST applications get queried or delayed is not a complex eligibility issue. It’s mismatched names, blurry scans, or wrong file formats. Preparing your document set completely before you log on to gst.gov.in reduces the risk of a REG-03 notice significantly and keeps the process moving without interruption.
Identity, PAN, and business constitution documents
PAN is the foundation of every GST application. For a sole proprietorship, the proprietor’s personal PAN is used. For a private limited company or LLP, the entity’s own PAN applies, along with PAN and Aadhaar of the authorised signatory. Companies also need the Certificate of Incorporation, Memorandum of Association, Articles of Association, and a board resolution authorising the signatory, as well as identity and address proof (and PAN) of directors as required by the portal, refer to gst.gov.in’s document advisor for the current list of required director proofs. Photo ID uploads, including Aadhaar, passport, or voter ID, must be in JPG format and under 1 MB. Photographs of the proprietor, partners, or directors follow the same format requirement.
Proof of business address and bank account
For owned premises, an electricity bill or property tax receipt in the business’s or owner’s name works as address proof. For rented or shared premises, you need a rent or lease agreement along with a No Objection Certificate from the property owner. Bank account proof must show the account holder’s name, account number, and IFSC clearly. A cancelled cheque, a recent bank statement, or the first page of the passbook all qualify. Most address and bank documents upload as PDF or JPEG, verify permitted file types and size limits on gst.gov.in’s document advisor before you begin, as these may be updated periodically.
GST registration process: starting on gst.gov.in with Part A of Form GST REG-01
The GST registration application, Form GST REG-01, is divided into two parts. Part A is the identity verification step, and it’s quick. Part B is the substantive section where you enter all your business details. You cannot reach Part B without completing Part A first, because Part A generates the Temporary Reference Number (TRN) that unlocks the rest of the application.
Step-by-step walkthrough of Part A on the portal
Navigate to gst.gov.in and follow this path: Services → Registration → New Registration. On the form that appears, select “Taxpayer” in the “I am a” field. Choose your state and district, then enter the legal name of your business exactly as it appears on the PAN card, with no abbreviations or variations. Enter the authorised signatory’s email address and mobile number, complete the captcha, and click Proceed. The portal sends separate OTPs to both the email and mobile number you’ve provided. Enter both OTPs to verify.
What happens after OTP verification: your TRN
Once both OTPs are successfully entered, the portal generates your Temporary Reference Number and sends it to your registered email and mobile. Save the TRN immediately. According to CBIC guidance, the TRN is valid for 15 days from generation, confirm the current validity period on gst.gov.in, as this may be revised. The TRN is the only way to log back in and access your Part B application. At this stage, nothing has been submitted yet. The TRN simply holds your application slot open while you gather the remaining information and documents to complete Part B.
Completing and submitting Part B of the GST REG-01 application
Return to the portal and navigate to Services → Registration → New Registration. Select the TRN option, enter your TRN, complete the captcha, and verify with the OTP. Your saved application opens, and you’ll see a series of tabs to complete in sequence. If your TRN is close to expiry, prioritise completing Part B in a single session to avoid having to restart Part A.
The key tabs in Part B and what each one requires
Work through the tabs in order, saving each one before moving to the next. The Business Details tab asks for your trade name, constitution of business (proprietorship, company, LLP, and so on), and the date your business commenced. Promoter and Partner Details covers the PAN, Aadhaar, photograph, and address of every promoter, director, or partner. The Authorised Signatory tab captures the details of the person who will sign and act on behalf of the business going forward.
The Principal Place of Business tab is where most queries originate: enter the full address, select the nature of possession (owned, rented, leased, shared), and upload the corresponding address proof. If your business operates from additional locations, add them in the next tab. The Goods and Services tab requires the HSN codes for goods you supply or the SAC codes for services. Finally, add your bank account details under the Bank Accounts tab before reaching the Verification tab for final submission.
Choosing between Aadhaar e-sign and DSC for final submission
Companies and LLPs are required to submit using a Digital Signature Certificate (DSC). Insert the DSC token, select the certificate, enter your DSC PIN, and submit. For proprietorships, partnership firms, and most other entities, Aadhaar e-sign via EVC is the simpler route: enter the 12-digit Aadhaar number of the authorised signatory, consent to authentication, and enter the OTP sent to the Aadhaar-linked mobile number. The portal signs and submits the application automatically. One critical point: the mobile number must be actively linked to the Aadhaar in the UIDAI database, or the authentication will fail and you’ll need to update it with UIDAI before proceeding.
After you hit submit: timelines, notices, and common errors to avoid
Once the application is submitted, the portal generates an Application Reference Number (ARN). This is your proof of submission and the reference you use to track progress. The processing experience from here depends almost entirely on the quality and completeness of what you submitted.
GST registration process timeline: what to realistically expect
A complete, well-documented application with successful Aadhaar authentication is typically processed within 7 working days. In low-risk cases with Aadhaar authentication, the timeline can be as short as 3 working days. If the GST officer has concerns, they issue a Form GST REG-03 notice requesting clarification. You then have 7 working days to respond via Form GST REG-04, and the officer has another 7 working days to decide after receiving your response, meaning a single REG-03 cycle adds approximately 14 working days to your timeline. Applications flagged for physical verification can take up to 30 working days or more. If the department takes no action within the prescribed period, the application is treated as deemed approved and the GSTIN is issued automatically. Refer to the latest CBIC guidance on gst.gov.in for current processing norms and any jurisdictional variances.
The REG-03 notice and common mistakes that trigger it
A REG-03 notice is not a rejection. It’s a request for clarification, and a thorough, document-backed response through REG-04 resolves most cases. The most frequent triggers are:
- Names on the application that don’t match PAN or Aadhaar records exactly
- Blurry or incorrect address proof
- Aadhaar authentication failure due to a non-linked mobile number
- A principal place of business that cannot be independently verified
If the application is ultimately rejected through Form GST REG-05, the business can reapply after correcting the identified issues. However, each REG-03 reply cycle adds approximately 14 working days to your timeline, and cases involving physical verification can extend this further, delaying invoicing, contracts, and e-commerce seller onboarding considerably.
When getting professional help prevents costly delays
Many straightforward registrations can be completed independently using the steps in this guide. A sole proprietorship with a clear PAN, Aadhaar, bank proof, and address proof for a single location engaged in a simple, single-state business activity is entirely manageable as a self-filed application. The complexity increases considerably in specific situations, particularly for inter-state suppliers, reverse charge registrants, e-commerce sellers, or businesses with multiple locations, and that’s where a single professional review more than pays for itself.
Why first-time applicants frequently hit avoidable roadblocks
The most common patterns we see are businesses selecting the wrong constitution type on the portal, uploading documents that technically qualify but don’t match the name or address in the application, and entering names inconsistently across PAN, Aadhaar, and the registration form. Each mismatch generates a REG-03 notice. Each notice adds approximately 14 working days before you can begin billing under a GSTIN, and physical verification cases can extend that further still.
How a specialised CA firm can get your GSTIN approved without back-and-forth
CAK & Associates LLP handles the entire GST registration process end to end: reviewing eligibility for the specific entity type, preparing a complete and consistent document set, filling the portal application accurately to prevent queries, and drafting REG-04 responses if an officer notice does arise. With over 50 years of chartered accountancy and tax compliance experience, including pre-GST indirect tax practice and GST compliance since its introduction in 2017, the team understands which documents pass scrutiny in which jurisdictions and which combinations of business address, constitution, and activity tend to attract physical verification. For businesses with multiple locations, inter-state supply, reverse charge liability, or e-commerce operations, the registration involves additional complexity that professional oversight addresses from the start rather than correcting after a rejection.
The process in summary: what to do, in what order
Check your turnover against the correct threshold for your state and business type, or confirm whether you fall into a mandatory registration category. Gather all documents before opening the portal: PAN, Aadhaar, photographs, address proof for the principal place of business, constitution documents relevant to your entity type, and bank account proof. Complete Part A of Form GST REG-01 on gst.gov.in to receive your TRN. Use that TRN to log back in, fill each tab in Part B thoroughly, and submit with DSC or Aadhaar e-sign as appropriate. GST registration online is completed entirely through gst.gov.in, there’s no need to visit a GST office for standard applications. Most delays come from avoidable documentation errors, not from the process itself.
Following this GST registration process carefully will help you obtain your GSTIN quickly and avoid the back-and-forth that comes from incomplete or mismatched applications. If your situation involves multiple states, e-commerce selling, reverse charge, or a more complex entity structure, a one-time review with CAK & Associates LLP before you apply can significantly reduce the likelihood of officer queries and timeline delays. Reach out to us for a consultation, and we’ll confirm your eligibility, review your document set, and handle the application so your registration is right the first time.
