The Income Tax due date calendar for 2025 outlines crucial compliance dates for taxpayers under the Income Tax Act 1961. Key dates include the deposit of tax deducted for various months, issuance of TDS certificates, and filings of returns. Notable deadlines are January 7 for tax deposits from December 2024, and January 15 for TCS return filing for Q3. Other important dates span throughout the year, including quarterly TDS and TCS submissions, advance tax installments, and various forms related to foreign remittances and income declarations. The calendar is vital for ensuring timely compliance and avoiding penalties.