<s>[INST] What can I do if I realize that I have missed a transaction while calculating my income in the Return of Income already filed by me? [/INST] You may consider Updating your Return of Income under Section​ 139(8A)) of the I.T. Act, 1961, if eligible, by paying tax on the missed income along with additional tax to avoid further proceedings in the form of assessment/re-assessment which could lead to tax demand and penalty. </s>