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. |