- September 15 – Third quarter installment of 2009 individual estimated income tax is due.
- September 15 – Filing deadline for 2008 tax returns for calendar-year corporations that received an automatic extension of the March 16 filing deadline.
- September 15 – Filing deadline for 2008 partnership tax returns that received an extension of the April 15 filing deadline.
- October 1 – Generally, the deadline for businesses to adopt a SIMPLE retirement plan for 2009.
- October 15 – Deadline for filing 2008 individual tax returns on extension.
Tags: 2009 tax filing deadlines
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