GST Registration Threshold in India — Who Must Register and When

Crossing the GST registration threshold quietly — without realising it — is one of the most expensive mistakes a small business in India can make. The penalty is 10% of the tax due (subject to a minimum of ₹10,000), and the department can demand GST on every invoice raised since the threshold was crossed. This guide walks through exactly when you must register, when it is worth registering voluntarily, and what changes after you do.

Current turnover thresholds

GST registration becomes mandatory once your aggregate turnover in a financial year crosses the prescribed threshold. The threshold depends on what you supply and where you are located.

Special category states for this purpose are: Manipur, Mizoram, Nagaland, Tripura, Arunachal Pradesh, Meghalaya, Sikkim, Uttarakhand, Puducherry, Telangana. Gujarat (where Pujara & Co is based) follows the normal threshold.

What counts as 'aggregate turnover'?

Aggregate turnover under Section 2(6) of the CGST Act is wider than just taxable supplies. It includes:

• All taxable supplies (excluding inward supplies on reverse charge).
• Exempt supplies — sales that are nil-rated or exempt.
• Exports of goods and services (zero-rated).
• Inter-state supplies of persons having the same PAN (across all states).

It does NOT include: GST itself, value of supplies on which the recipient pays under reverse charge, and supplies of services between distinct persons of the same entity.

When registration is compulsory regardless of turnover

Section 24 of the CGST Act lists categories where GST registration is compulsory from the first rupee of supply — the turnover threshold does not apply at all:

• Persons making any inter-state taxable supply (with limited service-sector exceptions notified by Notification 10/2017).
• Casual taxable persons making taxable supply (e.g. exhibitions, fairs in another state).
• Persons required to pay tax under reverse charge.
• Non-resident taxable persons.
• E-commerce operators required to collect tax at source under Section 52.
• Persons supplying through an e-commerce operator that is required to collect TCS.
• Input Service Distributors (ISD).
• Persons supplying online information and database access or retrieval services (OIDAR) from outside India to unregistered recipients in India.
• Persons required to deduct tax at source under Section 51 (typically government bodies).
• Agents supplying on behalf of another taxable person.

Voluntary registration — when it actually pays off

Section 25(3) allows you to register voluntarily even if not crossing the threshold. Once registered voluntarily you are treated like any other taxpayer — full compliance applies. So why would anyone register before they have to?

• Your customers are large B2B businesses who want to claim Input Tax Credit on your invoice — they often refuse to deal with unregistered suppliers.
• You are an exporter — registration lets you claim refund of input tax on exports (zero-rated supply).
• You source heavily from registered suppliers and want to recover the GST you pay on inputs.
• You want a clean GSTIN on your invoices for credibility (tenders, e-commerce listings, banking).

If your customer base is mostly individual consumers (B2C) and your input GST is low, voluntary registration adds compliance cost without commensurate benefit. The break-even calculation usually depends on your input-to-output ratio — we run this analysis for clients before recommending.

The composition scheme alternative

If you are above the threshold but small enough to qualify, the composition scheme under Section 10 lets you pay GST at a flat low rate on turnover with minimal compliance — no Input Tax Credit, no detailed return filing.

Composition taxpayers file Form CMP-08 quarterly and Form GSTR-4 annually — a fraction of regular compliance. They cannot make inter-state supplies, cannot collect GST from customers (the tax comes out of margin), cannot supply through e-commerce operators, and cannot claim ITC. The right fit is small B2C businesses with stable margins.

Registration process and timeline

1. Visit gst.gov.in and click 'New Registration'. Select 'Taxpayer' and the state of business.
2. Submit Part A — PAN, mobile, email. OTP verification. You receive a Temporary Reference Number (TRN).
3. Submit Part B — business details, proprietor/partner/director details, principal place of business, bank account, HSN/SAC codes of top supplies. Upload supporting documents.
4. Documents needed: PAN, Aadhaar of proprietor/partners/directors, photo, address proof (utility bill, rent agreement + NOC, property tax receipt), bank statement/cancelled cheque, Certificate of Incorporation (for company/LLP), authorisation letter.
5. Application is submitted with EVC or DSC. ARN (Application Reference Number) is generated.
6. Aadhaar authentication (mandatory for most categories) — OTP-based, takes 1-2 working days. Sometimes physical verification of premises is triggered.
7. GSTIN is issued — usually within 3-7 working days from a complete application.

Compliance obligations after registration

• Issue GST-compliant invoices with GSTIN, HSN/SAC code, tax rate, CGST/SGST/IGST split, and 'tax invoice' marking.
• GSTR-1: outward supplies — monthly (or quarterly under QRMP) by the 11th of next month.
• GSTR-3B: summary return and tax payment — monthly (or quarterly under QRMP) by the 20th of next month.
• GSTR-9: annual return — by 31 December following the financial year.
• GSTR-9C: self-certified reconciliation — mandatory only if aggregate turnover exceeds ₹5 crore.
• E-way bill for inter-state movement of goods above ₹50,000 (state-specific limits for intra-state).
• E-invoicing — mandatory for taxpayers with aggregate turnover above ₹5 crore (the threshold has progressively reduced over the years).
• Maintenance of records: purchase register, sales register, ITC ledger, stock register — for at least 72 months from due date of annual return.

Penalty for not registering on time

Operating without GST registration when you should be registered is treated as 'tax evasion' under Section 122. The penalty is the higher of ₹10,000 or 10% of the tax due. In practical terms, the GST officer can issue a notice demanding GST on every invoice raised since you crossed the threshold — often months or years of accumulated tax that the business owner had no idea was payable.

We have helped multiple clients negotiate down such demands, but the cleaner path is registering on time. If you are anywhere within ₹2-3 lakh of the threshold, get a CA opinion and register proactively. The compliance cost is a small fraction of the back-tax exposure.