GST registration in 2026: who needs it, documents and the full process

Most business owners ignore GST registration until something forces it — a customer asks for a GST invoice, a marketplace blocks their listing, or their sales quietly cross the limit. Then it's a panic.

Here's the simple answer: you must register for GST once your yearly sales cross ₹20 lakh for services or ₹40 lakh for goods (lower in some states), or the day you start selling online or across state lines. Below that, it's optional. The good news — registering is straightforward once you know the rules.

Below we cover who needs to register, the documents to keep ready, the step-by-step process on the GST portal, and the mistakes that get applications rejected. Rather skip the paperwork? Our GST team registers businesses every week.

Who needs to register for GST?

GST registration is mandatory once you cross a turnover threshold, but the threshold depends on what you sell and where you operate. The headline numbers are:

Threshold isn't the whole story, though. Several situations make registration compulsory regardless of turnover, and this is where businesses get caught out:

• You sell inter-state (goods from Karnataka to a buyer in Maharashtra, for example)
• You sell through an e-commerce operator like Amazon, Flipkart or a food-delivery platform
• You're liable to pay tax under reverse charge
• You're a casual taxable person or a non-resident making taxable supplies
• You're an input service distributor or an agent supplying on behalf of others

Should you register voluntarily?

Even when you're below the threshold, voluntary registration can make commercial sense. If your customers are themselves GST-registered businesses, they'll often prefer (or require) a GST invoice so they can claim input tax credit. Registering also lets you claim credit on your own purchases — rent, software, raw materials, professional fees.

The trade-off is real compliance: once registered, you must file returns every period even if you have no sales, or face late fees. For a B2B business that's a fair deal; for a tiny B2C side-hustle, it may not be. If you're unsure, a quick call with our GST team usually settles it in ten minutes.

Documents you'll need

The exact list depends on your business structure, but for most applicants it comes down to four buckets. Have clean scans ready before you start. A blurry or mismatched document is the single most common reason an application gets a query.

Identity and the business

• PAN of the business (and of the proprietor for a proprietorship)
• Aadhaar of the proprietor / partners / directors
• Photograph of the authorised signatory
• Proof of constitution: partnership deed, Certificate of Incorporation, or LLP agreement

Place of business

• Latest electricity bill, property tax receipt, or municipal khata
• Rent agreement plus a no-objection certificate (NOC) if the premises are rented

Bank and authorisation

• Cancelled cheque or bank statement showing name, account number and IFSC
• Board resolution or authorisation letter naming the signatory (for companies and LLPs)
• Digital Signature Certificate (DSC): mandatory for companies and LLPs

The step-by-step process

Registration happens entirely online at the GST portal. In FY 2026–27 the flow is firmly digital-first, with Aadhaar authentication now the default path that keeps approval fast.

• Step 1: Part A. Go to the GST portal, choose "New Registration", and submit your PAN, mobile and email. You'll verify both with an OTP and receive a Temporary Reference Number (TRN).
• Step 2: Part B. Log in with the TRN and fill in business details, promoters, the authorised signatory, place(s) of business, and your goods/services with HSN or SAC codes.
• Step 3: Upload documents. Attach the scans above against each section.
• Step 4: Aadhaar authentication. Complete e-KYC for the signatory. Opting in typically gets you approval in about 7 working days; declining it triggers physical verification of premises and a longer wait.
• Step 5: ARN and approval. On submission you get an Application Reference Number (ARN) to track status. Once approved, your GSTIN and registration certificate (Form REG-06) are issued and downloadable from the portal.

What happens after you're registered

Your GSTIN is a 15-digit number you must now print on every tax invoice and display at your principal place of business. Registration is the start of an ongoing cycle: GSTR-1 for outward supplies and GSTR-3B to pay tax, filed monthly or quarterly under the QRMP scheme. Miss them and late fees accrue per day, even on a nil return.

This is where many newly-registered businesses underestimate the workload. Filing isn't hard, but it's relentless, and the penalties for slipping compound quietly. If you'd rather not build that routine in-house, our GST service handles registration and every return after it, while clean monthly books make sure your input credit is never left on the table.

Common mistakes that cause rejection

• Wrong principal place of business. The address proof must match the premises you actually operate from. A virtual office without proper documentation invites a query.
• Choosing the wrong category. Registering as a regular taxpayer when the composition scheme suited you better (or vice versa) means re-doing paperwork later.
• Skipping Aadhaar authentication. It's optional but declining it slows everything down and triggers physical verification.
• Ignoring a REG-03 query. You have a limited window to respond with clarification; miss it and the application is rejected, and you start over.

Frequently asked questions

How long does GST registration take in 2026?

With Aadhaar authentication completed, approval usually comes within about seven working days. Without it, expect longer because the department conducts physical verification of your premises.

Is GST registration free?

Yes. The government charges no fee for registration on the portal. You only pay if you engage a professional to prepare and file the application correctly and respond to any queries.

Can I run a business without GST registration?

Only if you're below the threshold and none of the compulsory triggers apply: no inter-state supply, no e-commerce selling, no reverse-charge liability. Otherwise registration is mandatory and operating without it carries penalties.

What's the difference between regular and composition registration?

The composition scheme offers a lower, fixed tax rate with simpler quarterly filing, but you can't claim input tax credit or sell inter-state. It suits small, local B2C businesses; B2B sellers almost always want regular registration.

Do I need separate registration for each state?

Yes. GST is state-specific, so if you have a place of business in more than one state you need a separate GSTIN for each, all linked to the same PAN.