Subject to the provisions of the Companies Act, 1956 (Central Act 1 of 1956) where any tax or other amount recoverable under this Act from any private company, whether existing or wound up or under liquidation, cannot be recovered for any reason whatsoever, every person who was a director of such company at any time during the period for which the tax or other amount is due under this Act shall be jointly and severally liable for the payment of such tax or other amount.