Provisional assessment.

(1) Subject to the provisions of sub-section (2), where the taxable person is unable to determine the value of goods or services or both or determine the rate of tax applicable thereto, he may request the proper officer in writing giving reasons for payment of tax on a provisional basis and the proper officer shall pass an order, within a period not later than ninety days from the date of receipt of such request, allowing payment of tax on provisional basis at such rate or on such value as may be specified by him. (2) The payment of tax on provisional basis may be allowed, if the taxable person executes a bond in such form as may be prescribed, and with such surety or security as the proper officer may deem fit, binding the taxable person for payment of the difference between the amount of tax as may be finally assessed and the amount of tax provisionally assessed. (3) The proper officer shall, within a period not exceeding six months from the date of the communication of the order issued under sub-section (1), pass the final assessment order after taking into account such information as may be required for finalizing the assessment: