166. Variation of the amount of output tax deferred consequent upon verification of return in respect of a newly set up industrial unit or in the expanded portion of an existing industrial unit. –

Where the appropriate assessing authority finds after verification under sub-section (1) of section 42 of a return furnished by a dealer that an amount of output tax is payable in addition to what is shown in such return, such assessing authority shall add back the additional amount of such tax to the amount of tax shown in such return and deferred under rule 165 and he shall thereupon ascertain whether the cumulative amount of output tax deferred as it stands after such addition, exceeds the balance available amount that the dealer is eligible for deferment under sub-rule (1) of rule 165.