Federal Holidays
January 1	New Year's Day
January 18	Birthday of Martin Luther King, Jr.
February 15	Washington's Birthday
April 16	District of Columbia Emancipation Day
May 31	Memorial Day
July 5	Independence Day
September 6	Labor Day
October 11	Columbus Day
November 11	Veterans' Day
November 25	Thanksgiving Day
December 24	Christmas Day
E-File
January 15	First day to electronically file
January 17	First IRS acknowledgements of e-filed returns
April 15	Last day to e-file timely returns
April 15	Last day to e-file timely extension requests
April 20	Last day to retransmit rejected timely filed returns and extensions
June 15	Last day to e-file timely extension request for overseas taxpayers
October 15	Last day to e-file returns that received 6-month extension
October 20	Last day to retransmit rejected late or extension returns
Individuals
January 11	Report tips of $20 or more to employer
January 15	Make last 2009 estimated tax payment
February 10	Report tips of $20 or more to employer
March 10	Report tips of $20 or more to employer
April 12	Report tips of $20 or more to employer
April 15	Due date to file calendar year 2009 tax returns or request an automatic 6-month extension of time to file. Pay any tax that is due, even if you file a 6-month extension of time to file.
April 15	First 2010 estimated tax payment due
May 10	Report tips of $20 or more to employer
June 10	Report tips of $20 or more to employer
June 15	Second 2010 estimated tax payment due
July 12	Report tips of $20 or more to employer
August 10	Report tips of $20 or more to employer
September 10	Report tips of $20 or more to employer
September 15	Third 2010 estimated taxpayment due
October 12	Report tips of $20 or more to employer
October 15	Final due date to file calendar year 2009 tax returns for taxpayers who received a 6-month extension
November 10	Report tips of $20 or more to employer
December 10	Report tips of $20 or more to employer