Income Tax Return(ITR) filing is done after the completion of a financial year. The due dates for ITR filing as per section 139 of the Income Tax Act are: 

Due Date
 Individuals to whom audit is not applicable
 31 July 2023
 Individuals to whom audit is applicable
 31 October 2023

If you missed filing your original return (non-audit cases) by the due date (31st July 2023), you can still file a late return known as a Belated return till 31st December 2023.

The above due dates are subject to government/ITD extension or announcement.