(1) The Tribunal or the Commissioner or the officer on whom powers of the Commissioner for the purposes of sub-section (1) of section 46 have been conferred by the State Government may at any time within one year from the date of any order passed by him on an application made to him or of his own motion, rectify any mistake apparent from the record, and shall within a like period rectify any such mistake which has been brought to his notice by any person affected by such order:

Provided that the Commissioner may entertain an application under this sub-section after the expiry of the said period of one year, if he is satisfied that the applicant was prevented by sufficient cause from making the application in time:

Provided further that no such rectification shall be made if it has the effect of enhancing the tax or reducing the amount of refund, unless the Commissioner has given notice in writing to such person of his intention to do so and has allowed such person a reasonable opportunity of being heard.

(2) Where any such rectification has the effect of enhancing or reducing the amount of tax or penalty, the Commissioner shall, in the prescribed manner, order the recovery of the amount due from or as the case may be, order the refund of the amount due to, such person.