Day-one paperwork — incorporation and founders' agreement
Incorporate as Pvt Ltd if external funding is even a possibility within 18 months — investors will not fund LLPs without a conversion clause; the cost of conversion at fundraise time is non-trivial in time and tax.
Founders' / shareholders' agreement (SHA) — drafted before the team starts disagreeing, signed in week one. Core clauses: vesting (typically 4-year with 1-year cliff), reverse vesting on existing founder equity, IP assignment to the company, ROFR + ROFO on share transfers, drag-along, tag-along, board composition, reserved matters.
IP assignment — every founder and consultant signs over all pre-incorporation IP via a written assignment agreement, plus a present-tense "IP created during engagement" clause going forward. Without it, your codebase belongs to whoever wrote it personally.
Banking and books — open the bank account before raising any money. Move to a proper accounting system (Zoho Books, Tally, or hire a virtual CFO from day one) — angel investors will ask for monthly MIS at the seed pitch.
