S. 151 : Reassessment-After the expiry of four years-Sanction for issue of notice-Approval obtained for issuing notice u/s 148 of the Act is not in accordance with the mandate of section 151-Sanction from Additional Commissioner of Income-tax and not from the PCIT-Notice issued is bad in law hence quashed. [S. 148, Taxation and other Laws (Relaxation of Certain Provisions) Act, 2020, Art. 226]