The application for registration (FORM GST REG-01) shall be submitted online and shall be approved within 3 working days by the proper officer. If the proper officer finds that the application filed under the Act is deficient, then he may call for further clarification on the information or documents through a notice (in FORM GST-03) within 3 working days from the date of submission of application for registration. The applicant shall provide such additional information within 7 working days (in FORM GST -04), the proper officer shall approve the grant of registration within 7 working days of receiving such Form GST REG 04 giving certificate of registration (in FORM GST REG -06). If the proper officer doesn’t take any action within 3 days of receipt of application in GST REG or 7 days from receipt of form GST REG 04, then it shall deemed that the application of registration is approved.
(ICAI FAQ PUBLICATIONS 06-09-2017 REGISTRATION: FAQ NO. 38)