What documents should a landlord collect from a tenant?
Photo ID, address proof, something confirming employment or income, and photographs — plus police verification where the state requires it.
The usual set is a government photo ID, a proof of previous address, and evidence that the tenant can pay — an employment letter, recent payslips or bank statements. Passport-size photographs are commonly collected for the agreement and for police verification. For a company lease, the company's registration details stand in for personal proof.
Police verification of tenants is required in a number of states and cities, and several police forces provide an online form for it. Where it applies it is the landlord's responsibility, and skipping it can attract a penalty. Verification of foreign nationals carries separate obligations.
Collect what you need and no more. Copies of identity documents are sensitive personal data — store them securely, and do not pass them on to anyone who does not need them. The same care applies to the tenant's contact details after they move out.
General information about renting in India, not legal advice. Rules differ by state — check with your local Sub-Registrar office or a lawyer before acting on this.