GST registration isn't automatic when you incorporate a Private Limited Company in India — it's a separate filing, triggered by turnover or by the nature of your business, and the documentation a company needs is heavier than what a sole proprietor files. Here's exactly when it's mandatory and how the process actually runs.
When registration is actually mandatory
Under Section 22 of the CGST Act, a Private Limited Company must register once its aggregate turnover crosses ₹40 lakh for a business supplying goods, or ₹20 lakh for a business supplying services, in most states. Special-category states — the North-Eastern states and a few hill states — use lower thresholds of ₹20 lakh and ₹10 lakh respectively. "Aggregate turnover" is calculated across your entire PAN, all business verticals and locations combined, including taxable, exempt and export supplies, but excluding GST itself.
Separately, Section 24 lists compulsory-registration categories that apply regardless of turnover — even at ₹1 of sales. The one that catches the most founders by surprise: if you sell goods through an e-commerce operator (Amazon, Flipkart, your own site using a payment aggregator that counts as an operator), you generally need GST registration from your very first sale, threshold or not. Inter-state taxable supply is the other common trigger.
What a Private Limited Company needs that a proprietorship doesn't
A company's GST application requires the most comprehensive document set of any entity type: PAN and incorporation certificate of the company, MOA and AOA, PAN and address proof of every director, a board resolution authorising the signatory, proof of the registered office (utility bill plus either an ownership document or a rent agreement with NOC from the owner), and — critically for companies — a Digital Signature Certificate (DSC) of the authorised signatory. Unlike a proprietorship, which can sign via Aadhaar e-Sign, a company's GST application must be digitally signed with a DSC. If you're incorporating a new entity, this is worth bundling: the same MOA, AOA, board resolution and DSC used for MCA incorporation carry straight over into the GST filing, so gathering them once saves a second round of paperwork.
The filing process, step by step
File Form REG-01 on the GST portal
Business details, PAN, the date liability to register arose (the day you crossed the threshold, or the day your compulsory-registration trigger occurred), and promoter/director information.
Upload the document set
Incorporation documents, director KYC, registered office proof, and bank account details or a cancelled cheque.
Sign with the authorised signatory's DSC
Mandatory for a company — Aadhaar e-Sign, which sole proprietors and some other entity types can use, isn't accepted here.
Receive your Application Reference Number (ARN)
Sent to your registered email and mobile immediately on successful submission — this is your tracking number for the application, not the GSTIN itself.
Get your GSTIN
Low-risk applications, based on PAN/Aadhaar data validation, can be auto-approved within days under current rules. Others go through standard verification, typically resolving within about a week.
Voluntary registration before you're required to
A business below the threshold, not selling through e-commerce, and not making inter-state taxable supplies isn't required to register — but can choose to anyway. This is common for B2B companies that want to issue GST-compliant invoices and claim input tax credit on their own purchases from day one, rather than waiting until growth forces the issue.
What changes once you're registered
Registration isn't the finish line — it's the start of a recurring filing calendar: monthly or quarterly returns depending on your turnover slab, annual return (GSTR-9), and a GST audit reconciliation (GSTR-9C) once turnover crosses ₹5 crore. Building this into your compliance calendar from the registration date, rather than scrambling at the first filing deadline, is the difference between GST being routine and GST being a fire drill.
For the complete India incorporation process this usually sits alongside, see our India company registration guide.