
Tax Filing Deadlines: When is the Last Day to Report Taxes?
Key tax deadlines: April 15th for individual returns (Form 1040), extendable to October 15th with Form 4868. Business deadlines: March 15th for partnerships/S corporations, April 15th for C corporations, with extensions available. Quarterly estimated taxes due April 15th, June 15th, September 15th, January 15th. Special extensions for natural disasters, military, and U.S. citizens abroad. Missing deadlines incurs penalties.