(1) where it appears to the Commissioner that the tax under this Act has been short-levied through inadvertance, error or misconstruction on the part of the Commissioner or through any mis-statement of the owner or for any other reason, the Commissioner shall issue a notice directing the owner to produce or cause to be produced the books of account and other documents relevant for the purpose of examination for determining the amount of short levy and fixing a date not less than ten days from the date of notice for preferring objections and adducing evidence in support thereof.
(2) On the day specified in the notice issued under sub-section (1), or as soon thereafter as may be, after hearing such evidence as the owner may produce and such other evidence as the Commissioner may require on specified points and after taking into account all relevant materials, the Commissioner shall complete the assessment and determine the amount of tax short-levied under section 7.
23. In computing the period of limitation prescribed for an appeal or revision under this Act, the time required for obtaining the certified copy of the order against which the relief is sought for, shall be excluded.