The law
CGST Act 2017, Sec 22(1)
Registration needed once aggregate turnover in a year exceeds ₹20 lakh (₹10 lakh in special category States); can be raised to ₹40 lakh for suppliers of goods only, by notificationSource
CGST Act 2017, Sec 25(1), 25(2), 25(3)
Apply within 30 days of becoming liable, in every State where liable; one registration per State with separate registrations allowed for multiple places; voluntary registration allowedSource
CGST Act 2017, Sec 25(6) to 25(6D)
PAN is required; Aadhaar authentication of individuals and specified persons of non-individual applicants, with notified exemptionsSource
CGST Rules 2017, Rule 8
Part A with PAN, mobile and email OTP gives a TRN; Part B filed with documents; acknowledgement in REG-02; under Rule 8(4A) risk-flagged or non-Aadhaar applicants give biometrics, photo and original documents at a Facilitation CentreSource
CGST Rules 2017, Rule 9
Approval within 7 working days; 30 days with physical verification where Aadhaar not done or risk-flagged; query in REG-03, reply in REG-04 within 7 working days; rejection in REG-05; deemed approval if officer does not actSource
CGST Rules 2017, Rules 9A and 14A (Notification 18/2025-Central Tax, 31 October 2025, from 1 November 2025)
Rule 9A: system grant within 3 working days on risk analysis. Rule 14A: optional route for applicants whose monthly output tax on B2B supplies is up to ₹2,50,000; Aadhaar mandatory; grant in 3 working days; one such registration per PAN per State; exit through REG-32Source
CGST Act 2017, Sec 122(1)
Failure to take registration when liable: penalty of ₹10,000 or the tax involved, whichever is higherSource
Government fee
No government fee for GST registration on the portal; the tutorial lists no fee step before submission. Source: https://tutorial.gst.gov.in/userguide/registration/Apply_for_Registration_Normal_Taxpayer.htm . Casual taxable persons pay an advance tax deposit before the acknowledgement issues (Rule 8). Source: https://taxinformation.cbic.gov.in/content/html/tax_repository/gst/rules/cgst_rules/active/chapter3/rule8_v1.00.html
Late fee or penalty
No late fee for applying late, but a person who should have registered faces a penalty of ₹10,000 or the tax involved, whichever is higher, under Sec 122(1), plus tax and interest from the date of liability. Source: https://www.mastersindia.co/blog/gst-penalties-section-122-offences/