Court held that , (i) Merely because the original assessment is a detailed one, the powers of the AO to reopen u/s 147 is not affected, (ii) Information which comes to the notice of the AO during proceedings for subsequent AYs can definitely form tangible material to reopen the assessment, (iii) As regards “full & true disclosure of material facts”, the assessee has the duty to disclose the “primary facts”. It is not required to disclose the “secondary facts”. The assessee is also not required to give any assistance to the AO by disclosure of other facts. It is for the AO to decide what inference should be drawn from the facts, (iv) If the AO intends to rely upon the second Proviso to s. 148 for the extended period of 16 years limitation, the same should be stated either in the notice or in the reasons in support of the notice. It cannot be done in the order rejecting the objections or at a later stage . ( AY .2007 -08 , 2008 -09) CA No 1008 of 2020 dt 3-04 2020