Tuesday, April 17:
Federal tax filing deadline. In order for your return to be considered timely filed by the IRS, you will need to submit your return electronically by Tuesday, April 17th at midnight.
Monday, October 15:
If you requested a Federal tax-filing extension, you will need to submit your return to the IRS by Monday, October 15th.
For more important dates, view the Tax Calendar - Federal Due Dates