The dynamic annual information statement can cause a mismatch in data, even after returns are filed. To avoid delay in processing or refund, check your AIS, submit a feedback based on whether the expenses or taxes mentioned are valid or not.
For FY 2022-23 (AY 2023-24), a belated return can be filed till December 31, 2023, with a late fee and penal interest on due taxes. ITR can be picked up for scrutiny even after that, till 10 years.