To apply for a GST number online, visit the official GST portal at gst.gov.in and navigate to Services > Registration > New Registration. Complete Part A by entering your PAN, mobile number, and email, then verify via OTP to receive a Temporary Reference Number (TRN). Log back in with the TRN to complete Part B — entering business details, uploading documents, and authenticating via Aadhaar OTP or DSC. Upon submission, you receive an ARN (Application Reference Number) for tracking. The GST officer reviews the application and, if all is in order, issues the GSTIN within 3 to 7 working days. Alternatively, expert assistance is available at SetupFiling.in — visit our Apply for GST Registration page or our New GST Registration page to get started immediately.