Individuals - File an income tax return (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 $1,800 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 - Social Security, Medicare and withheld income tax. If the monthly deposit rule applies, deposit the tax payments for March.
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, Deductions, Credits, etc., or a substitute Schedule K-1. If you want an automatic 5-month extension 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 your estimated income tax for the current year. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.