How many times can I revise the return?
If a person after furnishing the return finds any mistake, omission or any wrong statement, then return should be revised within prescribed time limit.
A return can be revised at any time 3 months before the end of the Assessment Year or before the completion of the assessment; whichever is earlier.

If original return has filed in paper format or manually, then technically it cannot be revised by online mode or electronically. ​​​

Revised return can be filed online under section 139(5)​.​​