Registration as Tax Deductor/Collector under GST requires PAN/TAN, liability date, business and signatory details submission. Application for registration as a Tax Deductor (u/s 51) or Tax Collector (u/s 52) requires in Part A PAN/TAN, legal name, email and mobile for verification; Part B requires trade name, business constitution, state and jurisdiction, registration type, date of liability, principal place of business details (address, coordinates, possession status, contacts), any existing GST registrations, IEC if applicable, DDO/person responsible particulars, and authorized signatory identity and consent details.