Most individual tax returns (Form 1040) are due by April 15. Other common deadlines include:

  • Quarterly estimated taxes (Form 1040-ES): April 15, June 15, September 15, January 15
  • Business returns (Form 1120): 15th day of the 4th month after year-end
  • Extensions (Form 4868): April 15

Check the IRS Filing page for specific dates and potential changes.