2016

January

15 –	Fourth quarter 2015 estimated tax due. Use Form 1040-ES.

February

1 –	Deadline for employers to provide copies of Forms W-2 and 1099 for 2015 to employees.
16 –	If you claimed exemption from income tax withholding last year on the Form W-4 you gave your employer, you must file a new Form W-4 by February 17 to continue your exemption for another year.
29 –	Deadline for farmers and fishermen who have a balance due on their taxes to file their 2015 individual income tax returns and pay the balance due without penalties.

March

15 –	Deadline for 2015 corporate tax returns (Forms 1120 and 1120-S) or to request an extension using Form 7004.

April

18 –	Deadline to file 2015 individual income tax returns (Form 1040, 1040A, or 1040EZ) and any taxes owed, or to file for an automatic 6-month extension. (Note: If you are a resident of Massachusetts or Maine, Patriots’ Day (April 18) delays the due date for filing your income tax return until April 19.)
18 –	Last day to contribute to a traditional IRA, Roth IRA, or SEP-IRA for the 2015 tax year.
18 –	First quarter 2016 estimated tax due. Use Form 1040-ES.
18 –	Deadline to file 2016 trust tax returns (Form 1041) or to request an automatic extension.
18 –	Deadline to file 2016 partnership tax returns (Form 1065) or to request an automatic extension (Form 7004).

June

15 –	Deadline for U.S. citizens living abroad to file individual tax returns and pay any tax, interest, and penalties due, or to request a 4-month extension (Form 4868).
15 –	Second quarter 2016 estimated tax due. Use Form 1040-ES.

September

15 –	Third quarter 2016 estimated tax due. Use Form 1040-ES.

October

1 –	Deadline for existing employers to establish a SIMPLE IRA plan.
17 –	If you were given a 6-month extension to file your income tax return for 2015, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due.
17 –	Final deadline to file 2015 partnership tax return if you were given a 6-month extension.