Fourth quarter estimated tax due. Use Form 1040-ES.

Deadline for employers to provide copies of Forms W-2 and 1099 to employees.

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 15 to continue your exemption for another year.

Deadline for farmers and fishermen who have a balance due on their taxes to file their individual income tax returns and pay the balance due without penalties.

Deadline for S Corporation corporate tax returns (Form 1120-S) or to request an extension using Form 7004.

Deadline to file individual income tax returns (Form 1040, 1040A, or 1040EZ) and any taxes owed, or to file for an automatic 6-month extension.

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

First quarter estimated tax due. Use Form 1040-ES.

Deadline to file trust tax returns (Form 1041) or to request an automatic extension.

Deadline to file partnership tax returns (Form 1065) or to request an automatic extension (Form 7004).

Deadline to file corporate tax returns (Form 1120) or to request an automatic extension (Form 7004).

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).

Second quarter estimated tax due. Use Form 1040-ES.

Third quarter estimated tax due. Use Form 1040-ES.

Deadline for existing employers to establish a SIMPLE IRA plan.

If you were given a 6-month extension to file your income tax return, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due.

Final deadline to file partnership tax return if you were given a 6-month extension.