- October 1 – Generally the deadline for businesses to adopt a SIMPLE retirement plan for 2015.
- October 15 – Filing deadline for 2014 individual tax returns on automatic six-month extension of the April 15 deadline.
- October 15 – If you converted a regular IRA to a Roth in 2014 and now want to switch back to a regular IRA, you have until October 15, 2015, to do so without penalty.
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