You must buy health insurance on the marketplace during the annual Open Enrollment period.  The following dates are important if you want to buy Affordable Care Act insurance in 2014-2015:

• November 15, 2014: 2015 Open Enrollment starts
• December 15, 2014: Last date to enroll for coverage to start January 1, 2015
• December 31, 2014: Coverage ends for all 2014 Marketplace plans
• January 1, 2015: 2015 coverage can begin
• February 15, 2015: 2015 Open Enrollment ends

The first day to buy health insurance for 2015 is November 15, 2014 and the last day to buy health insurance for 2015 is on February 15, 2015.  If you qualify for Medicaid, there is no deadline.