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April 10
Employees – who work for tips. If you received $20 or more in tips during March, report them to your employer. You can use Form 4070.

April 15
Individuals – File an income tax return for 2013 (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 2013 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 (Form 1040) if you paid total cash wages of $1,000 or more in any calendar quarter of 2012 or 2013 to household employees.

Individuals – If you are not paying your 2014 income tax through withholding (or will not pay in enough tax during the year that way), pay the first installment of your 2014 estimated tax. Use Form 1040-ES.

Partnerships – File a 2013 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 5.

Electing Large Partnerships – File a 2013 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 15. See March 17 for the due date for furnishing the Schedules K-1 to the partners.

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