15 December 2015
If there is a minor mistake in address then there is no need to revise the return.
Time period of filing the revised return: As per section 139(5), the revised return can be filed before the expiry of one year from the end of the relevant assessment year or before the completion of assessment, whichever is earlier.
For example : Therefore a return of A.Y 2015-16 can be revised till 31st March 2017 or before the completion of the assessment whichever is earlier.