In this blog, we explain GST registration thresholds, who must register regardless of turnover, filing requirements, the Composition Scheme, and how timely GST registration and GST filing keeps your business compliant.
Here is something that catches a lot of small business owners off guard. They spend months building their product, setting up operations, getting their first few customers — and somewhere in between all of that, the question of GST registration gets pushed to the back. Not because they are trying to avoid it. Just because it feels like something they can sort out once things stabilise.
Then a larger client asks for their GSTIN before placing an order. Or they get a notice. Or they realise they have been selling across state lines without registering, which is a violation regardless of how much they are earning.
GST registration is not just a tax box to tick. It determines what you can sell, to whom, and whether your buyers can do business with you at all. Getting clarity on this early saves a lot of trouble later.
The Basic Threshold — When Registration Becomes Mandatory
For most businesses, GST registration kicks in once annual turnover crosses a specific limit. And that limit depends on what the business does and where it operates.
| Type of Business | Normal States | Special Category States |
| Supply of Goods only | Rs. 40 lakh | Rs. 20 lakh |
| Supply of Services | Rs. 20 lakh | Rs. 10 lakh |
| Both Goods and Services | Rs. 20 lakh | Rs. 10 lakh |
Special category states include Manipur, Mizoram, Nagaland, Tripura, Arunachal Pradesh, Meghalaya, Sikkim, Uttarakhand, and Himachal Pradesh. Businesses in these states hit the registration limit at a lower turnover — the standard Rs. 40 lakh threshold for goods does not apply there.
One thing most people get wrong here is how turnover is actually calculated. It is not just the sales from one shop or one service line. Aggregate turnover under GST includes all taxable supplies, exempt supplies, exports, and inter-state sales — added up across all businesses under the same PAN on an all-India basis. Two branches in different states? Their combined numbers determine whether the threshold is crossed.
When Turnover Does Not Matter at All
This is where a lot of startups make a costly assumption — that as long as turnover is low, there is nothing to worry about.
That assumption is wrong for specific categories of businesses. These are situations where GST registration is mandatory from day one, regardless of what the business earns:
- Businesses supplying goods or services across state lines — even one interstate transaction makes registration compulsory
- Sellers on e-commerce platforms like Amazon, Flipkart, Meesho, Zomato, or Swiggy — no turnover exemption applies here at all
- Casual taxable persons — those who temporarily supply in a state where they have no fixed place of business
- Businesses required to pay GST under the reverse charge mechanism
- Non-resident persons supplying to Indian customers
- Online service providers operating from outside India to unregistered persons within India
The e-commerce point is the one that catches the most startups off guard. A first-time seller on an online marketplace who is barely turning over Rs. 5 lakh a year still needs a GSTIN the moment they list on a platform. The law does not offer a turnover-based exemption here.
Should You Register Even If You Do Not Have To?
Sometimes yes — and the reason is practical, not just procedural:
- Voluntary GST registration gives you access to Input Tax Credit. Whatever GST you pay on purchases — raw materials, equipment, software subscriptions, office supplies — can be offset against the GST you collect on sales. For a business spending meaningfully on inputs, this is real money that stays in the business instead of going to the government.
- Beyond ITC, being GST registered signals credibility. Many mid-sized and large companies will not place orders with unregistered suppliers because they lose out on ITC when they do. In certain industries, being unregistered quietly closes doors with the clients you most want to work with.
- If you are planning to scale, expand to other states, or start selling online in the next year or two — registering early rather than scrambling when the threshold arrives is almost always the better decision.
What are the Documents Needed for GST Registration?
Keep these documents ready before you start — an incomplete application gets held up at the verification stage.
- PAN card of the business and all promoters or directors
- Aadhaar card of the business owner or authorised signatory
- Proof of business registration — incorporation certificate, partnership deed, or LLP agreement
- Proof of the principal place of business — rent agreement, electricity bill, or property tax receipt
- Bank account details — cancelled cheque or bank statement
- Photographs of the business owner or partners
- Digital Signature Certificate for companies and LLPs
Once submitted, an Application Reference Number is generated. After GST authority verification — which, since 2024, increasingly involves Aadhaar-based biometric authentication at a GST Seva Kendra — a GSTIN is typically issued within seven working days.
What Does GST Filing Actually Involve?
Registration is where it starts. What comes after is an ongoing filing calendar that runs throughout the year. Missing returns attracts late fees, interest on outstanding tax, and in cases of repeated non-compliance, suspension of the GSTIN itself.
The Two Returns Every Registered Business Files
GSTR-1 covers outward supplies — all your sales in a given period. For businesses with an annual turnover above Rs. 5 crore, this is filed monthly by the 11th of the following month. Smaller businesses on the QRMP scheme file it quarterly by the 13th of the month after each quarter ends.
GSTR-3B is the summary return where you declare the total tax liability and make a payment. Monthly filers submit this by the 20th. Quarterly filers under QRMP pay monthly through a challan called PMT-06 by the 25th, and file GSTR-3B quarterly.
GSTR-9 is the annual return pulling together the full year. For FY 2024-25, the due date is December 31, 2025.
What Late Filing Costs You
A delay of even one day attracts Rs. 50 per day in late fees — Rs. 25 each under CGST and SGST — per return. For nil returns where no tax is due, it is Rs. 20 per day. Interest at 18% per annum applies on outstanding tax from the original due date. Across a few missed return periods, these numbers add up to amounts that feel very avoidable in hindsight.
The QRMP Scheme — Fewer Filings for Smaller Businesses
If annual turnover is up to Rs. 5 crore, the Quarterly Return Monthly Payment scheme is worth considering. Instead of filing GSTR-1 and GSTR-3B every single month, you file them quarterly — but still pay tax monthly through PMT-06.
The practical benefit is significant. Instead of 24 returns a year for these two forms, you file 8. The monthly tax payment keeps the liability current without the administrative burden of full monthly returns. Buyers can still claim ITC without disruption.
The Composition Scheme — Built for Very Small Businesses
For businesses that are primarily local, do not sell interstate, and sit within the turnover limits — the Composition Scheme is a genuinely simpler way to handle GST.
Instead of calculating GST on individual transactions and managing ITC claims, you pay a flat percentage of total turnover as tax.
| Business Type | Flat Tax Rate | Turnover Limit |
| Manufacturers and traders | 1% of turnover | Up to Rs. 1.5 crore |
| Restaurants (no alcohol) | 5% of turnover | Up to Rs. 1.5 crore |
| Service providers | 6% of turnover | Up to Rs. 50 lakh |
Filing is dramatically simpler — just CMP-08 quarterly by the 18th of the month after each quarter, and GSTR-4 annually by April 30. No monthly GSTR-1 or GSTR-3B.
But the restrictions are real and worth understanding before opting in. Composition dealers cannot make interstate supplies of goods. They cannot claim Input Tax Credit. They cannot issue tax invoices — only bills of supply. And their customers cannot claim ITC on purchases from them, which makes this scheme a poor fit for businesses whose buyers are primarily GST-registered companies looking to claim credit.
The Composition Scheme works well for a local shop, a small manufacturer selling within the state, or a neighbourhood restaurant. It is not the right fit for a startup with national ambitions or a B2B business model.
Mistakes Small Businesses Make With GST
Here are the mistakes that cause the most trouble for small businesses and startups when it comes to GST registration and GST filing:
- Assuming that below-threshold turnover means no obligation to register — without checking whether e-commerce sales or interstate supplies apply, both of which make registration mandatory regardless of turnover.
- Starting to sell on Amazon or Flipkart without a GSTIN. This is one of the most common first-year mistakes and one of the most straightforwardly avoidable ones.
- Not filing nil returns. If a month has zero sales, a nil return still needs to be filed. Skipping it attracts the same late fee as skipping a return with actual transactions.
- Calculating turnover incorrectly by leaving out exempt supplies or export earnings — which must be included in aggregate turnover even when they attract zero tax.
- Waiting until the last moment to register when approaching the threshold. The registration process takes time, and operating above the threshold without a GSTIN — even briefly — is a violation.
Why Choose Vakilsearch
GST registration, scheme selection, and return filing involve decisions that are easy to get wrong without proper guidance — especially when your business is growing quickly or operating across states. Vakilsearch connects you with experienced GST professionals who handle registration, manage your return filings, help you choose between regular and composition schemes, and keep you updated when compliance rules change. From GSTIN to annual returns, Vakilsearch makes the process straightforward so you can focus on running the business.
FAQs
- Is GST registration mandatory if my annual turnover is below Rs. 40 lakh?
Not always — but it depends on what your business does. If you sell through e-commerce platforms, supply across state lines, or fall under any mandatory registration category under Section 24 of the CGST Act, registration is compulsory regardless of turnover. Voluntary registration is also available if you want to claim Input Tax Credit or improve your standing with larger clients who need ITC on purchases.
- Can a startup selling on Amazon skip GST registration because turnover is low?
No. Selling through an e-commerce operator is a mandatory registration category under GST law. Turnover does not matter here — the moment you list on a platform that collects payment on your behalf, you need a GSTIN. This applies to Amazon, Flipkart, Meesho, Zomato, Swiggy, and any similar platform.
- What happens if I miss filing GST returns after registration?
A late fee of Rs. 50 per day applies per return — Rs. 25 each under CGST and SGST. For nil returns, it is Rs. 20 per day. Interest at 18% per annum runs on any outstanding tax from the original due date. Repeated missed filings can lead to GSTIN suspension, which creates further problems when you try to resume normal operations.
- Is the Composition Scheme right for my small business?
It depends on your business model. The scheme suits businesses with local customers, intrastate operations, and turnover within the prescribed limits. It significantly reduces the filing burden. But it does not allow interstate supply of goods, ITC claims, or tax invoice issuance, which means your buyers cannot claim ITC on purchases from you. For B2B businesses or those planning to scale nationally, the regular GST scheme is usually the better fit.
