Household Employers - If you paid cash wages of $1,700 or more in 2010 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 2008 or 2009 to household employees. Also report any income tax you withheld for your household employees.

Individuals – If you are not paying your 2011 income tax through withholding (or will not pay in enough tax during the year that way), pay the first installment of your 2011 estimated tax. Use Form 1040-ES.

Partnerships - File a 2010 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 6-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 October 17.

Electing Large Partnerships – File a 2010 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 17. March 15 was the due date for furnishing the Schedules K-1 to the partners.

Corporations - Deposit the first installment of estimated income tax for 2011. A worksheet, Form 1120-W, is available to help you estimate your tax for the year.

Employers – Nonpayroll withholding. If the monthly deposit rule applies, deposit the tax for payments in March.

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