TDS Amount Error
The most common issue with returns filed is often a mismatch in the TDS amounts. Sometimes your employer or deductor may have delayed or made a mistake filing their TDS returns. If that is the problem with your return too, request your employer to revise the TDS amount credited to you.
Discrepancy in Return Filed by you
If the discrepancy is with the amounts declared by you in the returns you filed, try to understand the difference.
Documentation
Sometimes the IT department would like to review certain documentation based on which your returns were filed. In case of such a request, furnish the said documents immediately.
Tax Returns Not Filed
In case the notice is to remind you that you have not filed your tax returns yet, do so without any delay. The IT department can remind you about unfiled returns for the previous 6 assessment years.