September 2011 Business Due Dates

• Posted on August 24, 2011
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September 1 - Fall 2011 and 2012 Tax Planning

Contact this office to schedule a consultation appointment.

September 15 - Corporations

File a 2010 calendar year income tax return (Form 1120 or 1120-A) and pay any tax, interest, and penalties due. This due date applies only if you timely requested an automatic 6-month extension.

September 15 - S Corporations

File a 2010 calendar year income tax return (Form 1120S) and pay any tax due. This due date applies only if you requested an automatic 6-month extension.

September 15 - Corporations

Deposit the third installment of estimated income tax for 2011 for calendar year corporations.

September 15 - Social Security, Medicare and withheld income tax

If the monthly deposit rule applies, deposit the tax for payments in August.

September 15 - Nonpayroll Withholding

If the monthly deposit rule applies, deposit the tax for payments in August.

September 15 - Partnerships

File a 2010 calendar year return (Form 1065). This due date applies only if you were given an additional 5-month extension. Provide each partner with a copy of K-1 (Form 1065) or a substitute Schedule K-1.

September 15 - Fiduciaries of Estates and Trusts

File a 2010 calendar year return (Form 1041). This due date applies only if you were given an additional 5-month extension. If applicable, provide each beneficiary with a copy of K-1 (Form 1041) or a substitute Schedule K-1.