If you purchased a health plan through www.healthcare.gov, it is absolutely vital that you keep your information up-t0-date. For example, you must update your information when you turn 65 and go on Medicare. Or, the company you work for puts in a group plan for which you and your family are eligible. There are many life change events that may apply to you! Use the link above, or call The Marketplace direct at 1.800.318.2596. If you are getting a tax credit premium subsidy, you could owe some or all of the credit back on your taxes, if you fail to report a life change event.