March 15 Due Dates/Deadlines

March 15	Employers - Social Security, Medicare, and withheld income tax. If the monthly deposit rule applies, deposit the tax for payments in February.
	Employers - Nonpayroll withholding. If the monthly deposit rule applies, deposit the tax for payments in February.
	Corporations - File a 2015 calendar year income tax return (Form 1120) 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 2015 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.
	Partnerships - File a 2015 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 August 15.
	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. The due date applies even if the partnership requests an extension of time to file the Form 1065-B by filing Form 7004.
	S corporation election - File Form 2553, Election by a Small Business Corporation, to choose to be treated as an S corporation beginning with calendar year 2016. If Form 2553 is filed late, S treatment will begin with calendar year 2016.