GST Registration in India 2025-26 — Complete Guide for Businesses & E-Commerce Sellers

1. What Is GST? Structure, Components & GST 2.0

GST stands for Goods and Services Tax. It replaced a messy combination of Central and State taxes — VAT, Service Tax, Excise Duty, and about a dozen others — when it came into effect on 1 July 2017. The idea was simple: one tax, one country, no cascading effect where you pay tax on tax on tax.

Under GST, tax is collected at every stage of the supply chain. But the tax paid at each previous stage is credited forward, so only the final consumer actually bears the full burden. For your business, this means you collect GST from your customers, subtract the GST you paid on your own purchases (called Input Tax Credit), and pay only the difference to the government.

The four components — which one applies depends on the type of sale

On an intra-state sale at 18%, you charge 9% CGST + 9% SGST. On an inter-state sale at 18%, you charge 18% IGST. The Centre then shares the IGST with the destination state. Your customer sees the same total tax either way.

Your GSTIN — what those 15 characters actually mean

A lot of people treat their GSTIN as just a number they paste into forms. It is worth knowing what it says about your business.

So 27ABCDE1234F1Z4 tells you: Maharashtra-based business, PAN ABCDE1234F, first GSTIN in that state. If you open a second branch in Karnataka, your Karnataka GSTIN starts with 29.

GST 2.0 — what changed from 22 September 2025

The GST Council overhauled India's tax rate structure in September 2025 — what the industry is calling GST 2.0. The old four-slab system (5%, 12%, 18%, 28%) has moved to a cleaner three-primary-slab structure:

If you are an existing seller, do not assume your product's tax rate is the same as before. Several categories — personal care, certain electronics accessories, textiles — have been moved to different slabs. Check before your next return filing.

2. Who Must Register, Thresholds & Types

There are two reasons you might need to register for GST — your turnover crosses a threshold, or the nature of your business makes registration mandatory regardless of how much you earn.

Threshold-based registration

Special-category states are the northeastern states — Manipur, Meghalaya, Mizoram, Nagaland, Tripura, Arunachal Pradesh, Sikkim, Uttarakhand, Himachal Pradesh, and J&K.

One thing most people get wrong: "aggregate turnover" means all your sales combined under the same PAN — across every state, every marketplace, every product. Not per state. Not per platform. One PAN, one combined number.

Mandatory registration regardless of turnover

These businesses must register even if they earn ₹1:

1. Inter-state taxable supply
2. Casual taxable persons — temporary out-of-state supply (trade fairs, exhibitions)
3. Persons paying GST under reverse charge
4. Non-resident taxable persons
5. TDS deductors
6. Input Service Distributors
7. E-commerce operators that collect TCS (Amazon, Flipkart, Meesho — the platforms themselves)
8. Suppliers selling through e-commerce operators where TCS is collected. This is you if you sell on Amazon, Flipkart, or Meesho.
9. OIDAR service providers (foreign digital services like Netflix, Google Ads)
10. Online money gaming suppliers — added post-2023

The October 2023 exception

From 1 October 2023, there is one carve-out: intra-state goods sellers on certain platforms who are below the regular threshold do not have to register under the e-commerce mandatory rule. In practice, this mainly covers Meesho's intra-state seller model.

This does not apply to: service sellers, inter-state sellers, FBA sellers who warehouse in other states, or anyone who crosses the threshold. If you are on Meesho but also sell on Amazon or send packages to other states, the exemption does not protect you.

Voluntary registration — when it makes sense even below the threshold

You can register voluntarily even if your turnover is below ₹40L. Good reasons to do this: you want to claim back GST on your business purchases, your B2B buyers are asking for a tax invoice, you want to list on marketplaces that ask for a GSTIN, or you are building credibility for a bank loan application. (Worth knowing: GST registration and MSME / Udyam registration are different things — many small businesses need both.)

The 8 types of GST registration

3. GST Registration for E-Commerce Sellers

This is the section most guides skip entirely or cover in two vague paragraphs. GST registration for e-commerce sellers is genuinely different from registration for an offline shop or a service business — the rules around mandatory registration, multi-state GSTINs, and marketplace compliance are specific enough that generic guides are more likely to mislead than help.

The first question: do you need one GSTIN or multiple?

This is where most new sellers go wrong. They register one GSTIN in their home state and assume that covers everything. Sometimes it does. Sometimes it really does not.

The reason FBA sellers need multiple GSTINs: Amazon's Fulfilment Centres count as your "Additional Place of Business." Your stock sitting in a Karnataka FC means you are operating in Karnataka. You need a Karnataka GSTIN.

The solution for most FBA sellers is a VPOB — Virtual Place of Business. A virtual office agreement from a registered co-working or virtual office provider in the FC state gives you a legitimate business address to register. Most states accept this. A few (Tamil Nadu, Karnataka at times) have been stricter on new FBA-state registrations and may ask for physical verification.

Where every marketplace stands on GSTIN

Why composition dealers cannot sell on e-commerce

The law is blunt on this — a composition taxpayer cannot sell through any e-commerce operator that collects TCS. That means Amazon, Flipkart, Meesho — all of them.

You would be surprised how many guides miss this. We have seen sellers register under composition, list on Amazon, get flagged six months later, and have to retroactively migrate to regular registration while dealing with a credit mess for their buyers. Do not do this.

The fast-track registration trap — read this before you apply

To qualify, your monthly B2B output tax must not exceed ₹2.5 lakh. That is roughly ₹13.9 lakh per month in turnover at 18%. Most serious marketplace sellers cross this within 6 to 18 months of starting.

When you breach the cap, you have to file a withdrawal form within a specific window. Miss that window? Your registration becomes irregular. Every B2B buyer who claimed back the GST on purchases from you in that period faces reversal. It is a mess.

Our recommendation: If you are a marketplace seller who expects to cross ₹50 lakh per year in the next 12 months, do not opt into the fast-track option. Use the standard route — there is also a system-based 3-day approval for low-risk applications, with none of the cap restrictions.

4. Documents Required for GST Registration

Here is the thing about document rejections: they are almost never about missing documents. They are almost always about mismatched names, wrong file formats, or the address on the electricity bill not matching the address on the application. Get these details right upfront and your application sails through.

Documents everyone needs regardless of business type

• PAN card — of the business and all promoters
• Aadhaar card — of all promoters and authorised signatories
• Passport-size photograph — of each promoter and signatory
• Address proof for your principal place of business
• Bank account proof — cancelled cheque, bank statement, or passbook
• Digital Signature Certificate — mandatory for companies and LLPs; strongly recommended for everyone else

Additional documents by business type

Address proof — what works for which premises

Practical tips that save your application from rejection

Name the files properly — RentAgreement_Karnataka.pdf instead of scan001.jpg. The GST officer reviewing your application is looking through hundreds of submissions a day; a clearly named file signals that you know what you are doing.

Keep files under 1 MB each, in JPEG or PDF format. Anything larger gets flagged.

Make sure the name on the electricity bill matches the legal name on your PAN. This single mismatch is the reason most clarification notices are issued.

5. How to Register for GST: Step-by-Step

The GST registration process in 2025 is done entirely online at gst.gov.in — no office visit, no physical paperwork, no standing in queues. The one exception is if your state requires biometric Aadhaar verification at a GST Seva Kendra.

Part A — Get your TRN (Temporary Reference Number)

1. Go to gst.gov.in → Services → Registration → New Registration
2. Select your taxpayer type — Regular, Composition, NRTP, etc.
3. Enter your State, District, legal name as it appears on your PAN, PAN number, email, and mobile number
4. You'll get two OTPs — one on email, one on your mobile. Enter both.
5. Your TRN is generated. Save it immediately. It is valid for 15 days and is not re-sent via email. If you lose it and the 15 days lapse, you start over.

Part B — Fill the registration form (10 tabs)

Log in with your TRN and work through all 10 tabs:

Aadhaar verification — OTP or biometric at a Seva Kendra?

After you submit Part B, Aadhaar verification is triggered.

If your Aadhaar is linked to your current mobile number, you get an OTP. Enter it, done.

If you are in a state that has been notified for biometric verification — Gujarat, Andhra Pradesh, Telangana, Karnataka, Maharashtra, Tamil Nadu, Delhi, and more, with rollout still ongoing — you need to visit a GST Seva Kendra in person with your original Aadhaar and PAN for biometric verification. If you skip this step, your application sits in "Pending for Aadhaar verification" indefinitely.

Two-step login — set it up before your first portal login

What happens after you submit

Your 7 application statuses — what each one means and what to do

6. GST Registration Timeline & Fees

Two questions every seller asks before applying: how long does it take, and what does it cost?

How long does it actually take?

Cost: the official portal is free

The Government of India charges ₹0 for GST registration. Any service that adds a fee is charging for the expertise, document review, and time-saving — not for the registration itself.

eComHelp.in GST registration packages

We have helped thousands of businesses register. Here is what we offer:

7. After Registration: The First 30 Days

Getting your GSTIN feels like the finish line. It is actually the starting line.

More compliance problems happen in the 30 days after GSTIN issuance than at any other point — because nobody tells new registrants what to do next. Here is the complete list.

Everything you need to do in the first 30 days

The bank account deadline — this one bites people

A blocked GSTIN cannot issue valid tax invoices, generate e-way bills, or file returns. Reviving it requires filing a revival form and waiting for officer review. This is a completely avoidable problem. Set a calendar reminder the minute you get your GSTIN.

The 10-field address on your certificate — verify it carefully

The new GST registration certificate uses a 10-field address format: Floor No. → Building Name → Premises Name → Road/Street → Landmark → Locality → City → District → State → PIN. Go through every field and make sure it matches your actual address before you start distributing the certificate to suppliers and buyers. One mismatch can create credit disputes during audits.

8. GST Returns: Forms, When & How

Once registered, you are on a GST return filing calendar whether you are selling or not. Even if you do zero business in a month, you file a nil return. Miss it and the late fee clock starts ticking immediately.

The full GST returns calendar

Quarterly filing — a simpler option if your turnover is below ₹5 crore

The QRMP scheme (Quarterly Return Monthly Payment) lets you file GSTR-1 and GSTR-3B quarterly instead of monthly. You still pay tax monthly through a challan, but the return filing burden drops significantly. Most small and medium sellers do well on QRMP.

The nil return late fee myth — still showing up on guides in 2025

Almost every guide online says nil returns have no late fee. This has not been true for years. GSTR-3B late fee is ₹20 per day even for nil returns (₹10 CGST + ₹10 SGST). Not a huge amount per day — but if you miss 3 months on two returns, you are looking at ₹3,600 in late fees before interest. File on time, every time.

9. GST Payments: How to Pay Online

When it is time to pay your GST, everything happens through the portal. There are no cheques, no physical bank visits needed (unless you specifically prefer paying at a bank counter).

The three ledgers — think of these as three buckets

The system forces a specific order: credit first, then cash. You cannot skip this.

How to make a GST payment

1. Go to gst.gov.in → Services → Payments → Create Challan
2. Enter amounts by head — IGST, CGST, SGST, Cess separately
3. Choose your payment mode: Net Banking, NEFT/RTGS, Debit Card, or at a bank counter
4. After payment, the amount reflects in your Cash Ledger within one working day
5. When you file GSTR-3B, the system auto-offsets credit first, then uses your Cash Ledger

Interest on late or short payment: 18% per annum. There is no grace period — it starts the day after the due date. On a ₹1 lakh underpayment, that is ₹49 per day in interest.

10. Claiming Back GST (Input Tax Credit)

This is the mechanism that makes GST non-cascading — you subtract the GST you paid on your inputs from the GST you collect on your outputs, and only pay the government the difference. In practice, it means every GST rupee you paid on raw materials, packaging, shipping, and services can come back to you.

Four conditions — all four must be met to claim it

1. You hold a valid tax invoice from a GST-registered supplier
2. You have actually received the goods or services
3. The supplier has paid the tax and filed their return — meaning it shows up in your monthly statement (GSTR-2B)
4. You have filed your own GSTR-3B

If your supplier files late or does not file at all, condition 3 fails and you cannot claim that credit — even if you have a perfect invoice in hand. This is why chasing suppliers to file on time is genuinely in your financial interest.

Credit you cannot claim

The law blocks the credit on a specific list: personal-use motor vehicles, food and beverages (unless you are in the food business), outdoor catering, health clubs, beauty treatments, club memberships, construction of personal/immovable property, and life/health insurance for employees (unless mandated by law).

GSTR-2B is your only source of truth

Your monthly GSTR-2B statement is auto-populated from your suppliers' filings. Claim only what is in GSTR-2B. If something is missing, the supplier has not filed — follow up with them directly. Mismatches between your claim and your GSTR-2B are one of the most common triggers for GST scrutiny notices.

11. TCS, GSTR-8 & Marketplace Reconciliation

This is the section most specific to marketplace sellers — and almost entirely absent from every other guide. Here is exactly how TCS works, where the money goes, and how to make sure you are not leaving credit on the table.

TCS — what it is and what the current rate is

Every marketplace operating in India must deduct Tax Collected at Source (TCS) from your settlement and deposit it with the government. The rate from 10 July 2024 is:

• 0.5% of your net taxable sales value — not the total invoice, just the taxable portion before GST
• Split as 0.25% CGST + 0.25% SGST on intra-state supplies
• Or 0.5% IGST on inter-state supplies

The old rate was 1%. Most guides still say 1%. If your marketplace is still deducting at 1%, raise a ticket immediately — that is your money.

How TCS flows from the marketplace to your GST credit

Walk through a real example. You make a ₹10,000 sale. Taxable value: ₹8,475. GST at 18%: ₹1,525.

1. Marketplace deducts TCS: 0.5% × ₹8,475 = ₹42.38 held back from your payout
2. Marketplace deposits ₹42.38 with the government and files its monthly TCS return by the 10th of the following month
3. ₹42.38 auto-populates in your monthly GSTR-2B statement as TCS credit received
4. This credit moves to your Cash Ledger
5. When you file GSTR-3B, your output GST liability (say ₹1,525) is offset first by your purchase credits, then by your Cash Ledger balance — which includes this TCS credit
6. You pay only the net remaining balance in cash

GST TCS vs Income Tax TDS — keep these completely separate

Both apply to marketplace sellers. They are from two different tax systems and cannot be offset against each other.

Section 9(5) — when the marketplace pays GST on your behalf

For certain specified services, the law makes the marketplace pay the GST directly — not you. This applies to:

The important caveat: this only covers the supplies made through that platform. If the same restaurant earns from dine-in, direct orders, or catering — and total turnover crosses ₹20 lakh — it must register and charge GST on those other supplies.

12. Composition Scheme: Should You Opt In?

The Composition Scheme exists for small businesses that want simplicity over sophistication — a flat rate on turnover, quarterly returns, no input tax credit calculation. For the right business, it is genuinely useful. For the wrong business, it is a serious mistake.

Who can opt in — and at what rate

What being on composition actually means

You pay GST on your total turnover at the flat rate above — not just on your margin, not after deducting credits. You issue a "Bill of Supply" instead of a tax invoice. Your buyers cannot claim back the GST from you. You cannot sell inter-state. You file simpler quarterly and annual returns.

Who should choose composition

A local kirana store selling only within their city. A neighbourhood restaurant. A small service provider with entirely local, face-to-face, B2C customers who have no use for input tax credit and want minimal compliance.

Who should absolutely not choose composition

Anyone selling on Amazon, Flipkart, Meesho, or any marketplace — the law prohibits this, period. Anyone selling inter-state. Anyone whose buyers are GST-registered businesses that need to claim back the GST from your invoice. Anyone who expects to grow beyond the threshold in the next year.

If you are an e-commerce seller considering composition because "it seems simpler" — the answer is no. Register as Regular from day one. Composition will cost you more in lost credits and the eventual forced migration than the compliance simplification saves you.

13. GST Notices, Audits & How to Respond

Receiving a GST notice does not mean you have done something wrong. It means a system or an officer has flagged something that needs a response. The worst thing you can do with any GST notice is ignore it.

The most common notices and what they mean

The only rule you need to remember about GST notices

Download it from the portal the day it arrives. GST notices are not always emailed — they are posted to your portal dashboard. Check your dashboard every week, not just when you are filing. Note the response deadline. Respond before it. Even if you need more time, an acknowledgement and a request for extension is infinitely better than silence.

If you do not respond, the officer can issue what is called a "best judgement assessment" — they decide the tax amount themselves, usually higher than what you actually owe.

14. Amendment, Cancellation & Suspension

Core vs non-core amendments — two very different processes

The PAN portability trap — a mistake that creates massive problems

If your PAN changes — because you converted from sole proprietorship to a company, or because of a business restructuring — you cannot amend your GSTIN. You must cancel the existing GSTIN and apply fresh under the new PAN.

Same with state: if you move your business from Maharashtra to Karnataka, you cannot amend the Maharashtra GSTIN to a Karnataka one. Cancel in Maharashtra (after clearing all returns and dues) and register fresh in Karnataka.

The danger here: businesses that try to amend these fields when fresh registration is the correct path end up with irregular GSTINs. Every B2B buyer who has claimed back the GST on invoices from you then faces reversal.

Cancellation

You can voluntarily cancel when: business is shut down, transferred, amalgamated, or turnover has been below threshold for 12 consecutive months. Before you apply, file every pending return — GSTR-1, GSTR-3B, GSTR-9. A cancellation with pending returns will not go through.

Suspension — what triggers it automatically

• Returns not filed for 6 consecutive months (regular) or 3 consecutive quarters (composition)
• Bank account not added within 30 days of GSTIN
• Significant GSTR-1 vs GSTR-3B discrepancies flagged by the system

How to revive: File all pending returns → apply for revocation → officer reviews and revokes suspension.

15. What Changed in 2024-25 — A Quick Update

GST is not a set-it-and-forget-it compliance. Seven material changes in the last 18 months alone.

16. Myth vs Fact: 15 Things Most Pages Get Wrong

We went through 75+ GST registration guides — from the big-name service firms to the bank blogs to the marketplace seller pages. These 15 errors showed up over and over. Every single one has a real consequence for businesses that believed it.

17. GST Penalties & Late Fees

Nobody likes this section. But knowing these numbers in advance is the cheapest compliance insurance you can get.

One thing worth calculating: ₹50 per day across two returns (GSTR-1 + GSTR-3B) is ₹100 per day, ₹3,000 per month. If you miss three months, that is ₹9,000 in late fees before interest even begins. Set automated reminders. File on time. Always.

18. GST Helpline & 12-Language Support

When something goes wrong — application stuck, GSTIN suspended without warning, portal error you cannot resolve, notice in confusing language — here is exactly where to go. This information is buried in the official GST Welcome Kit. Almost no public guide mentions it.

The official self-service grievance portal — selfservice.gstsystem.in

This is the official portal for taxpayers. You can report:

• Registration issues — application stuck, ARN error, biometric failure
• Return filing issues — GSTR-1 upload error, GSTR-3B mismatch
• Payment issues — challan generated but amount not credited to your ledger

It is available in 12 Indian languages: English, Hindi, Bengali, Marathi, Telugu, Tamil, Gujarati, Kannada, Odia, Malayalam, Punjabi, and Assamese. Select your language from the dropdown when filing a complaint. No guide on the internet highlights this — but it is real government-built infrastructure that resolves most portal-level issues within 2–5 working days.

Other support channels

19. Frequently Asked Questions