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SEPTEMBER
Date
Form
Description
09/06/10
Labor Day
Federal Holiday
09/15/10
1040-ES
Individual estimated tax: 3rd installment for 2010
09/15/10
1041-ES
Trust and Estates estimated tax: 3rd installment for 2010
09/15/10
1120-W
Calendar Year Corporations estimated tax: 3rd installment for 2010
09/15/10
1120 & 1120S
Corporations: income tax return with an automatic 6-month extension
09/15/10
1065
Partnerships: income tax return with an automatic 5-month extension
09/15/10
1041
Trusts and Estates: income tax return with an automatic 5-month extension
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