The following documents will be needed if the private company goes for voluntary liquidation.
1.DECLARATION OF SOLVENCY: Declaration of Solvency duly supported by audited financials, valuation report and list of debts, is required to be given by majority of Directors verified through an affidavit stating that they have made a full inquiry into the affairs of the company and it shall be able in meeting liabilities and not being liquidated to defraud people.
2.Special Resolution for apponting a liquidator who can also be the insolvency professional.
and any further requirements has to be met out after appointment of an liquidator like advertisement in the newspaper and necessary forms filed with ROC.