To rectify any errors in your income tax return, you can file a revised return as per Section 139(5) of the Income Tax Act. However, it's important to note that the revised return can only be filed within three months before the end of the relevant assessment year.

While AIS provides a more extensive view of income from various sources, Form 26AS focuses solely on TDS and TCS information. It is advisable to refer to both AIS and Form 26AS during ITR filing since they serve distinct purposes.

This discrepancy may catch the attention of the tax department, resulting in a tax demand notice being issued to you. This notice will require you to pay any additional tax dues that may be applicable based on the unreported income.