8 Things to Check Before You Apply for GST Registration

Most GST applications do not fail on big questions. They fail on small mismatches that were sitting in the documents a week before anyone opened the portal — a mobile number that no longer receives the Aadhaar OTP, a bank account in the wrong name, a rent agreement with no consent letter behind it. The officer then raises a clarification notice, the clock resets, and a two-day job becomes a three-week one. I tell every client the same thing: the application is the easy part. The morning you spend checking these eight things before you file is what makes it easy.

Short answer: Before you open Form GST REG-01, confirm that PAN, Aadhaar and mobile details line up for every key person, the bank account carries the right name, your premises proof and consent papers are complete, photographs meet the portal spec, your DSC works if you need one, your places of business and activity codes are decided, and the email and mobile you register are ones you will control for years.

1. Do PAN, Aadhaar and mobile line up for every key person?

REG-01 pulls your legal name straight from PAN, and Aadhaar authentication sends its OTP to the mobile number linked to Aadhaar — not to the number you type into the application. Those are two different databases, and founders discover the gap mid-filing. Check the proprietor first. In a firm or company, check every partner or director whose details go in, plus the authorised signatory. Names should read the same across PAN and Aadhaar, and each Aadhaar-linked mobile should be active and in hand on filing day. Our guide to Aadhaar verification for GST registration covers the fixes when the OTP route fails. Ten minutes of checking here saves the whole application.

2. Is the bank account in the right name?

The portal wants bank proof that shows the account holder's name, the account number and the IFSC — a cancelled cheque, the first page of the passbook, or a statement page. The trap is the name. For a proprietor, the account should sit on the proprietor's PAN. For a company or LLP, it must be the entity's account, not a director's personal one, however convenient that feels in week one. Open the right account before you apply, even if it delays filing by two days. Swapping bank details later means an amendment, fresh proof, and questions you could have skipped entirely.

3. Is your premises proof complete — including consent?

This is where most clarification notices are born. Owned premises are simple: a property tax receipt, municipal khata or a recent electricity bill. Rented premises need the rent or lease agreement plus proof that the lessor owns the place. Working from a family home or a shared office needs a consent letter or NOC from the owner, the owner's identity proof, and an ownership document. Under CBIC Instruction 03/2025-GST, officers must work from this set list and cannot demand the lessor's PAN or Aadhaar — but they can, and do, ask when the set itself is incomplete. Match the address in your papers, word for word, to the address you will type.

4. Do your photographs pass the portal spec?

A small check. A frequent failure. Each photograph — proprietor, partners, directors, signatory — must be recent, of the person alone, full front face, in JPEG within 100 KB. Not a group photo from an office party. Not a neat crop lifted from a PAN card or passport, which the guidelines reject outright. Take fresh phone photographs against a plain wall, check the file size before filing day, and keep one file per person, named clearly. Officers spot a recycled identity-document crop instantly, because they see hundreds of them. This takes fifteen minutes to get right and can cost a week if you get it wrong.

5. Does your DSC work — if your constitution needs one?

Companies and LLPs must sign REG-01 with a Digital Signature Certificate. Proprietors and partnership firms can sign with an electronic verification code instead. So if you are a company or an LLP, test the authorised signatory's DSC before you start: token plugged in, drivers installed, certificate valid and not expiring this month, signing tested on the portal machine you will actually use. A dead DSC discovered at the submission screen is a miserable afternoon — the form is filled, the TRN clock is running, and the one signature the law insists on will not load. Test it the day before. Replace it the day before, if it fails.

6. Have you fixed your principal place — and every other place?

Decide, on paper, which address is your principal place of business. Then list every other place in the same state where business actually happens: the warehouse, the second shop, the godown you think of as temporary. Each one goes into the application as an additional place of business, with its own address proof. Places in other states are a separate matter — each state needs its own registration under the same PAN. Founders under-declare here because the list feels like paperwork. Then stock sits in an undeclared godown, an officer visits, and a filing shortcut turns into a penalty conversation. Declare the real map of the business.

7. Are your goods and services codes chosen, not guessed?

REG-01 asks for your main lines of business as codes — up to five HSN codes for goods and five SAC codes for services. Pick them from what you actually sell, not from what a similar-looking business uses. These codes follow you into invoicing, rates and returns, so a lazy pick here echoes for years: the wrong code can mean the wrong rate on every invoice you raise. Sit with your product list or service list, search each line on the official HSN search, and write the final five down before you log in. If your mix is wide, choose the lines that carry the most turnover first, and note the rest for your first invoices.

8. Will this email and mobile still be yours in five years?

Think of the Part A email and mobile as the front door of your registration — like the mobile number linked to a bank account, everything important arrives there first. The TRN, the OTPs, the clarification notices, the password resets, the department's letters for years to come. Yet founders file with a consultant's personal Gmail or an employee's mobile, then lose access the month that relationship ends. Use an email the business owns and a mobile the business controls. Note the credentials somewhere safe, with a second person in the business who can reach them. Our documents checklist for GST registration pairs with this check — papers ready, contacts permanent, and the filing itself becomes a formality.

Read the eight again and you will see the pattern. Not one of them is about tax law. Every one is about whether your names, numbers and papers agree with each other before a system — and then an officer — compares them. GST registration rewards the prepared applicant almost embarrassingly fast, and it punishes the hurried one with the slowest tool it has: a notice, a reply, and another wait. Do the checks on a quiet morning. File once.

If you would rather have the readiness check done for you — every name matched, every paper checked against the current CBIC list, the DSC tested before we file — that is exactly how we run GST registration at ComplyKart, and we stay on the application until your GSTIN is issued.