ITR Filing Deadline 31 August 2026: Who Must File ITR-3/ITR-4 Now & What Happens If You Miss It ITR-3 and ITR-4 (non-audit) returns for AY 2026-27 are due by 31 August 2026. Here’s who this applies to, how to file, and the penalty for missing the deadline. Introduction If you file Income Tax Return...