New Delhi, Aug. 13 -- Filing your income tax return (ITR) before the 31 July deadline does not necessarily mean you are done with the Income Tax Department for the year. A return can be filed on time and still be flagged later if the information declared by the taxpayer does not match data available with the department.

The department can process the return, compare it with information available through tax statements and third-party reporting, and seek clarification where discrepancies are found. Here are three major reasons why a taxpayer who filed the ITR on time could still receive an income tax communication.

One of the most common triggers is a mismatch between the income declared in the ITR and information available with the Inco...