December 2025 deadlines you can’t miss:From Aadhaar–PAN linking, advance tax to belated ITR filing – tasks to avoid heavy penalties

The last month of the year—December 2025—has begun. Several crucial financial deadlines fall this month, including Aadhaar-PAN linking and advance tax payment. Missing these may lead to penalties or disruptions. Here are the four key tasks you must complete: 1. File Income Tax Returns for Tax Audit Cases 2. Last Chance to Pay Advance Tax 3. File Your Belated ITR If you haven’t filed your ITR for FY 2024–25, you can still submit it—with late fees—until December 31, 2025. Late fee details: 4. Link Aadhaar with PAN Linking can be completed easily on the Income Tax e-filing portal using your PAN, Aadhaar, and OTP. A penalty fee is applicable.