Unless otherwise indicated, all deadlines related to TAXES are at 11:59:59 P.M. (one second before midnight) local time. See also IRS Publication 509. March 31, 2014 Health care coverage deadline for most uninsured taxpayers to avoid the Affordable Care Act penalties on their 2014 tax returns. November 15, 2014 Start of 2015 open enrollment at the HealthContinue reading “March 16, 2015 deadline for business structure execution”