¹[123D. Power of Commissioner regarding assessment.The Commissioner may, at any time
        (a) make, suo motu, an assessment in any case where a return on the basis of self assessment has not been filed;
        (b) revise any assessment where the information furnished in the return of self assessment is found to be incorrect;
        (c) reopen any assessment even after the period of one year in any case where it has been detected that there is wilful suppression of information; and
        (d) impose a penalty not exceeding thirty per cent of the difference in tax arising from non-filing of a return in time, giving wrong information or wilful suppression of facts].