Key dates from the federal tax calendar.

January 15, 2015

Estimated tax for the 4th quarter of 2015 due for those who do not pay their income tax throughout the year through withholding.

February 1, 2015

Employers must send out W-2 Forms and 1099 Forms to employees and non-employees who provide services.

February 15, 2015

If you claimed exemption from income tax withholding on the W-4 Form you gave your employer last year, you must file a new Form W-4 by this date to continue your exemption for another year.

February 28, 2015

Businesses must file paper copies of Form 1099 with the Internal Revenue Service.

March 15, 2015

Businesses must file “Form 1120” for the calendar year and pay any taxes due.

April 18, 2015

2015 individual income tax returns due, along with any tax, interest, and penalties due.

Last day to contribute to a traditional IRA, Roth IRA, or SEP-IRA for the 2015 tax year.

Estimated tax for the 1st quarter of 2016 due for those who do not pay their income tax throughout the year through withholding.

June 15, 2015

2015 individual income tax returns due for those who live outside the United States.

Estimated tax for the 2nd quarter of 2016 due for those who do not pay their income tax throughout the year through withholding.

September 15, 2015

Estimated tax for the 3rd quarter of 2016 due for those who do not pay their income tax throughout the year through withholding.

Businesses tax returns due for those business that were given a 6-month extension to file returns for 2015.

October 17, 2015

Individual income tax returns due for those who were given a 6-month extension to file income tax returns for 2015, along with any tax, interest, and penalties due.