(1) Assessment of the tax payable by a proprietor shall be made after examining the accounts or registers and other evidences as the prescribed authority may require.
(2) In case a proprietor does not furnish any return or fails to produce accounts for assessment as required under sub-section (1), the prescribed authority may, after giving the proprietor a reasonable opportunity of being heard, assess the amount of tax payable by such proprietor, to the best of his judgment.
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(3) If the prescribed authority, upon information which has come into his possession, is satisfied that the proprietor has been liable to pay tax under this Act in respect of any period, and has nevertheless failed to apply for registration under section 6 or having so applied failed to comply with any requirement for registration within a reasonable time and for which his application for registration has been rejected such prescribed authority shall, after giving the proprietor an opportunity of being heard, assess the amount of tax to the best of his judgment in respect of such period and shall also impose a penalty which shall be equal to the amount of tax so assessed.