With 31 July just over a month away, the countdown for filing income tax returns (ITR) for the financial year 2025-26 (assessment year 2026-27) has begun. Before you start the exercise, you must acquaint yourself with the changes in rules and forms this year. While the new Income Tax Act, 2025 came into force on 1 April 2026, ITR filing for FY2025-26 will be governed by the Income Tax Act, 1961.