January presents several key income tax deadlines for taxpayers and entities. Key dates include January 7 for depositing TDS and TCS collected in December 2025, and January 14 for issuing TDS certificates for November 2025 deductions related to property, rent, contractor, or virtual asset transactions. Government offices have specific filing deadlines, such as January 15 for Form 24G. Missing these deadlines can result in interest and penalties, emphasizing the importance of timely compliance.