15 April 2012
If any person, having furnished a return under sub-section (1) of Section 139 discovers any omission or any wrong statement therein, he may furnish a revised return at any time before the expiry of one year from the end of the relevant assessment year or before the completion of the assessment, whichever is earlier :..”
So it is clear that belated return u/s 139(4) can not be revised.
In simple terms , a person can revise return within:-
1)before expiry of one year from the end of relevant assessment year or 2)before completition of assessment, whichever is earlier.
18 April 2012
In certain circumstances when unintentional mistakes crept out in return, specially, at the time of e-filing of return, CPC considers the same favorably. In some of the cases, suppose we forgot to enter the details of TDS, we may enter the details and revise it. .
However, you have to track the Receipt and Intimation of CPC after filing such revised returns. .