Filing income tax returns (ITR) on time is essential to avoid penalties and compliance issues. For the financial year 2025-26 (assessment year 2026-27), the Income Tax Department has set various deadlines based on taxpayer categories. Salaried individuals must file their ITR using forms ITR-1 or ITR-2 by July 31, 2026. Business owners and freelancers using ITR-3 or ITR-4 have until August 31, 2026. Tax audit cases must file by October 31, 2026. If taxpayers miss the original deadline, they can file a belated return until December 31, 2026, though this may incur penalties. Additionally, updated returns can be filed until March 31, 2031, allowing taxpayers to correct any missed income disclosures. Important advance tax deadlines are also in place, with the first installment due by June 15, 2025 and subsequent installments due throughout the year. Understanding these timelines and the options for belated, revised, and updated returns is crucial for compliance and to avoid unnecessary penalties.