This comprehensive blog post outlines the significant changes introduced by the Income Tax Department for Assessment Year 2025-26 (FY 2024-25) concerning ITR-1 (Sahaj) and ITR-4 (Sugam) under the Old Tax Regime. It details the newly mandated annexures for claiming various deductions, including HRA, Section 80C, 80D, 80DD, 80DDB, 80E, 80EE, and 80EEB. Readers will find crucial information on the new required fields for each section, key points to remember for seamless e-filing, common validation errors to avoid, and important deadlines. The post emphasizes the importance of accurate data submission and retaining supporting documents to ensure tax compliance.