The first notice dt. 20th Feb., 2011 under S 143(2) was issued when no return of income was available on record and therefore, the said  notice cannot be said to have been issued to verify whether the assessee has understated the income or has computed excessive loss or underpaid the taxes in any manner  hence cannot be considered as valid notice.Return which was filed  on 31st March, 2011, the time-limit for issuance of notice under S. 143(2) as per proviso to cl. (ii), was available only till 30th Sept., 2011. Second notice under s. 143(2) was issued on 17th Oct., 2011, i.e., beyond the time-limit prescribed under the provisions of s. 143(2). Therefore, the second notice is also invalid as per the provisions of S. 143(2). Since the assessee did not furnish its return of income within the time allowed under S. 139(1), as per S. 139(4), the assessee had time till 31st March, 2011 to furnish its return of income, i.e., one year from the end of the relevant asst. yr. 2009-10. Accordingly, the return of income filed by the assessee on 31st March, 2011 is within the time allowed under the Act. The  said return.  The requirement of issuance of valid notice under S. 143(2) cannot be dispensed with. Since no valid notice under S 143(2) was issued by the AO and the assessment  completed without following the mandatory requirement, the entire assessment proceedings concluded under S. 143(3)/ 147 is null and void, hence  quashed. (AY. 2009-10)