Time limit for submission of revise IT return

B RAMA KRISHNA (Assistant Accounts Officer (Retd) in Electricity Department )   (106 Points)

23 February 2020  
Sir
I have submitted IT return for AY 2018-19 with all income shown in 26AS and 143(1) also received.
Now that 26AS changed with some more income with TDS thereon.
Some other reason I have verified 26AS otherwise I would have not noticed change.
Now can I revise the return for getting refund only & what is time limit for revision.
Please clarify Sir