Declaration for commencement of business: file Form INC-20A confirming paid subscriptions, registered office verification, and professional certification. Form INC-20A requires an authorised board signatory to declare compliance with the Companies Act and rules, confirm subscribers have paid for shares, and confirm verification of the registered office under section 12(2); a practising professional must certify verification of particulars and attachments against original company records, with prescribed attachments (office photographs, bank receipt for subscription monies, regulator registration or RBI certificate/Nidhi notification) and warning of penalties under Sections 448 and 449 for false statements or evidence.