What are the key tax-related deadlines in October?

Key income-tax deadlines in October include October 7 for depositing TDS and TCS collected or deducted during September 2026. October 15 is the deadline for issuing specific quarterly TDS certificates and filing designated non-resident or remittance forms for the quarter ended September 30. October 21 is the revised deadline for specified taxpayers to furnish tax audit reports for AY 2026-27.