April 18 – Social Security, Medicare and Withheld Income Tax
If the monthly deposit rule applies, deposit the tax for payments in March.
April 18 – Non-Payroll Withholding
If the monthly deposit rule applies, deposit the tax for payments in March.
April 18 – Corporations
The first installment of 2011 estimated tax of a calendar year corporation is due.
April 18 – 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, Deductions, Credits, etc., or a substitute Schedule K-1. If you want an automatic 5-month extension of time to file the return and provide Schedules K-1 or a substitute Schedules K-1 to the partners, file Form 7004. Then, file Form 1065 and provide the K-1s to the partners by September 15.
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