January 15

Employers - Social Security, Medicare and withheld income tax. If the monthly deposit rule applies, deposit the tax for payments in December of this year. Nonpayroll Withholding. If the monthly deposit rule applies, deposit the tax for payments in December.

Individuals - Make a payment of your estimated tax for this year if you did not pay your income tax for the year through withholding (or did not pay in enough tax that way). Use Form 1040-ES. This is the final installment date for this year's estimated tax. However, you do not have to make this payment if you file this year's return (Form 1040) and pay any tax due by January 31 of the following year.

March 15

Employers - Nonpayroll Withholding. If the monthly deposit rule applies, deposit the tax for payments in February.

Employers - Social Security, Medicare, and withheld income tax. If the monthly deposit rule applies, deposit the tax for payments in February.

Corporations - File a previous calendar year income tax return (Form 1120 or 1120-A) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.

S Corporations - File a previous calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120S), Shareholder's Share of Income, Credits, Deductions, etc., or a substitute Schedule K-1. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.

Electing large partnerships - Provide each partner with a copy of Schedule K-1 (Form 1065-B), Partner's Share of Income (Loss) From an Electing Large Partnership. This due date is effective for the first March 15 following the close of the partnership's tax year. The due date of March 15 applies even if the partnership requests an extension of time to file the Form 1065-B by filing Form 8736 or Form 8800.

S Corporation election - File Form 2553, Election by a Small Business Corporation, to choose to be treated as an S Corporation beginning with current calendar year. If Form 2553 is filed late, S treatment will begin with next calendar year.

April 15

Individuals - File an income tax return for previous year (Form 1040, 1040A, or 1040EZ) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return, or you can get an extension by phone if you pay part or all of your estimate of income tax due with a credit card. Then file Form 1040, 1040A, or 1040EZ by October 15.

Household employers - If you paid cash wages of $1,700 or more in the previous year to a household employee, file Schedule H (Form 1040) with your income tax return and report any employment taxes. Report any federal unemployment (FUTA) tax on Schedule H if you paid total cash wages of $1,000 or more in any calendar quarter of the previous 2 years to household employees. Also report any income tax you withheld for your household employees.

Individuals - If you are not paying your current year income tax through withholding (or will not pay in enough tax during the year that way), pay the first installment of your current estimated tax. Use Form 1040-ES.

Employers - Nonpayroll Withholding. If the monthly deposit rule applies, deposit the tax for payments in March.

Partnerships - File a previous calendar year return (Form 1065). Provide each partner with a copy of Schedule K-1 (Form 1065), Partner's Share of Income, Credits, Deductions, etc., or a substitute Schedule K-1. If you want an automatic 5-month extension of time to file the return and provide Schedule K-1 or a substitute Schedule K-1, file Form 7004. Then file Form 1065 by September 15.

Electing large partnerships - File a previous calendar year return (Form 1065-B). If you want an automatic 6-month extension of time to file the return, file Form 7004. Then file Form 1065-B by October 16. See March 15 for the due date for furnishing the Schedules K-1 to the partners.

Corporations - Deposit the first installment of estimated income tax for current year. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.

June 15

Individuals - Make a payment of your current estimated tax if you are not paying your income tax for the year through withholding (or will not pay in enough tax that way). Use Form 1040-ES. This is the second installment date for estimated tax in current year.

October 15

Individuals - If you have an automatic 6-month extension to file your income tax return for 2013, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due.

Electing Large Partnerships - File a 2013 calendar year return (Form 1065-B). This due date applies only if you were given an additional 6-month extension. See March 17 for the due date for furnishing or substituting the Schedules K-1 to the partners.

December 15

Corporations - Deposit the fourth installment of estimated income tax for 2014. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.