GST Registration for MSMEs in 2026: Thresholds, Documents and Timelines

Most small businesses register for GST for one of two reasons: they cross the turnover limit, or a customer, marketplace or bank asks for a GSTIN. This guide sets out when registration is compulsory, what the thresholds actually mean, and how to get through the process without a rejection.

The thresholds

The limit depends on what you supply and where you are:

Type of supply	Most States (incl. Haryana, Punjab, Rajasthan)	Special-category States
Goods only	₹40 lakh	₹20 lakh
Services, or goods and services	₹20 lakh	₹10 lakh

"Turnover" here means aggregate turnover — all taxable, exempt and export supplies of all your businesses under one PAN across India, but excluding GST itself and inward supplies on which you pay reverse charge.

The ₹40 lakh limit for goods has conditions: it is not available if you supply ice cream, pan masala or tobacco, if you are required to register compulsorily (below), or if you also make any supply of services beyond the small interest/deposit income that is ignored for this purpose.

When you must register regardless of turnover

Section 24 of the CGST Act lists compulsory cases. The ones that catch MSMEs most often:

• Inter-State supply of goods (services have a ₹20 lakh threshold even inter-State).
• Casual taxable persons — selling at an exhibition or fair in another State.
• Persons liable to pay reverse charge on inward supplies.
• E-commerce operators and, in most cases, sellers through them.
• Input Service Distributors, agents supplying on behalf of others, and persons required to deduct TDS/collect TCS under GST.

When you may want to register voluntarily

Below the threshold you can still register. Reasons to do so:

• B2B customers want a tax invoice so they can claim input tax credit.
• Subsidy and tender applications often ask for a GSTIN.
• Banks treat GST returns as evidence of turnover for working-capital limits.
• You buy from registered suppliers and want to claim the input tax credit yourself.

Once registered you must file returns even for nil turnover, so weigh the compliance cost.

Documents for Form REG-01

• PAN of the business (or proprietor) and Aadhaar of the proprietor/partners/directors.
• Proof of business address — ownership document, or rent agreement plus the owner's NOC and a utility bill.
• Bank account proof — cancelled cheque or first page of the passbook (can be added within 30 days of registration).
• Constitution proof — partnership deed, LLP agreement, or certificate of incorporation.
• Photographs of promoters and the authorised signatory, and an authorisation letter or board resolution for the signatory.

Address proof is the most common reason for queries. The document must match the address on the application exactly, and a rent agreement should be in the name of the business or the proprietor.

Timelines

1. Submit REG-01 with Aadhaar authentication.
2. If everything is in order, the officer approves within seven working days. Without Aadhaar authentication, or where physical verification of premises is ordered, the officer has up to thirty days.
3. If the officer issues a query in REG-03, reply in REG-04 within seven working days. No reply, or an unsatisfactory one, leads to rejection in REG-05.
4. On approval you receive the REG-06 certificate with your 15-digit GSTIN, effective from the date you became liable if you applied within 30 days of that date.

After registration

• Display the certificate at your premises and the GSTIN on your signboard.
• Issue tax invoices in the prescribed format; from ₹5 crore annual turnover, e-invoicing applies.
• Choose your return cycle: monthly GSTR-1 and GSTR-3B, or the QRMP scheme (quarterly returns, monthly payments) if turnover is up to ₹5 crore.
• If you opted for composition, file CMP-08 quarterly and GSTR-4 annually.
• Add your bank account within 30 days if you did not at registration — the portal blocks GSTR-1 otherwise.

Common mistakes

• Registering under the wrong State when the business has premises in two States (each State needs its own registration).
• Choosing composition and then making an inter-State sale, which ends composition eligibility.
• Ignoring the REG-03 query deadline.
• Not filing nil returns after voluntary registration, which leads to late fees and eventually cancellation.

Need help with registration or a query notice? Our GST services cover registration, returns and notice replies. If you have already received one, our guide to GST notices sets out the reply window for each form.