S. 148A : Reassessment-Conducting inquiry, providing opportunity before issue of notice-Cancellation of old Permanent Account Number card and obtaining of New Permanent Account Number card-Intimated to Income-Tax Authorities-Notice referring to old Permanent Account Number card-Notice is not valid-Obiter : The Income-tax authorities ought to prominently display the steps for cancellation of a permanent account number on their website apart from sending a link for cancellation in the covering letter when a permanent account number is provided to an assessee. [S. 147, 148 148A(b) 148A(d), Art. 226].