Liquidator notification triggers tax-security assessment and directors may face joint liability for unrecoverable tax in liquidation. The appointed receiver (liquidator) must inform the Chief Commissioner within thirty days of appointment; the Chief Commissioner shall, after inquiry, notify within three months an amount sufficient to cover tax, interest or penalty payable by the company. If tax cannot be recovered on winding up of a private company, every person who was a director during the period for which tax was due is jointly and severally liable, unless he proves to the Chief Commissioner that non-recovery was not due to gross neglect, misfeasance or breach of duty.