GST Registration for Small Businesses in Mumbai — A Practical 2026 Walkthrough

If your business turnover crosses ₹20 lakh (services) or ₹40 lakh (goods), GST registration is mandatory. Many Mumbai shop owners also register voluntarily because B2B clients ask for a GSTIN.

**Documents needed** - PAN of proprietor / company - Aadhaar of proprietor / directors - Photo - Business address proof (electricity bill + rent agreement / NOC) - Bank account details (cancelled cheque or first page of passbook)

**Fees** Government fee: ₹0. Professional fee varies. We charge a flat fee with no hidden add-ons.

**Timeline** - Aadhaar-authenticated application: 3–7 working days - Without Aadhaar auth: 15–21 days plus possible physical verification

**Common rejections** 1. Address proof name does not match the rent agreement. 2. Electricity bill older than 2 months. 3. Photo and signature mismatch with PAN.

**After registration** You must file GSTR-1 and GSTR-3B every month or quarter (QRMP). Skipping returns leads to ₹50/day late fees and can block your e-way bills.