December 2025 features critical deadlines for Income Tax Returns (ITR) and TDS compliance in India. The due date for filing belated or revised ITR for Assessment Year 2025-26 is December 31, 2025, provided no assessment has been completed prior.​​

Income Tax Filing Extensions

The original ITR filing deadline for certain assessees (corporate, audited non-corporate, or partners in audited firms) was extended from October 31 to December 10, 2025, via Circular No. 15/2025 dated October 29. Tax slabs for AY 2025-26 remain structured with nil tax up to ₹2.5-3 lakh, 5% on the next bracket, and so on under the new regime.​​

TDS and Other Compliances

Key TDS actions include issuing certificates for deductions under sections 194-IA, 194-IB, and 194M from October 2025 by early December, plus challan-cum-statements for November deductions. The third advance tax installment for AY 2026-27 is also due this month.​

GST and Cess Updates

GST compensation cess on tobacco and pan masala products will transition post-December as loan repayments conclude, with a related bill introduced in Parliament's Winter Session. Businesses should monitor GSTR-9/9C filings, mandatory for turnovers above ₹2 crore pan-India.