January - March:
- January 15 - Estimated tax due for income earned in September, October, November & December for those who do not pay their income tax throughout the year through withholding
- January 31 - Employers must send out W-2 Forms and 1099 Forms to employees and non-employees who provide services
- February 15 - 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 - Businesses must file paper copies of Form 1099 with the Internal Revenue Service
- March 15 - Partnerships must file form 1065 for the calendar year and pay any taxes due
- March 15 - S Corporations must file form 1120S for the calendar for the calendar year and pay any taxes due
April - June:
- April 15 - Individual income tax returns due, along with any tax, interest, and penalties due
- April 15 - Last day to contribute to a traditional IRA, Roth IRA, or SEP-IRA for the tax year
- April 15- Estimated tax for the 1st quarter of due for those who do not pay their income tax throughout the year through withholding
- April 15 - C Corporations must file form 1120 for the calendar year and pay any taxes due
- June 15 - Individual income tax returns due for those who live outside the United States
- June 15 - Estimated tax for income earned in April & May due for those who not pay their income tax throughout the year through withholding
July - September:
- September 15 - Estimated tax for income earned in June, July & August for those who do not pay their income tax throughout the year through withholding
- September 15 - Partnerships tax returns due for those businesses that were given a 6-month extension to file returns
- September 15 - S Corporations tax returns due for those businesses that were given a 6-month extension to file returns
- September 15 - Businesses tax returns due for those businesses that were given a 6-month extension to file returns
October - December:
- October 15 - Individual income tax returns due for those who were given a 6-month extension to file income tax returns, along with any tax, interests, and penalties due
- October 15 - C Corporations tax returns due for those business that were given a 6-month extension to file returns