The actual dollar amount will depend on your plan. Employers sometimes subsidize the plan premium their employees pay so that employees do not bear the full cost of the plan. Once you are no longer an employee, however, you may be responsible for the full cost of your premium plus a small administrative fee. You can be required to pay up to 102 percent of your health insurance premium. If you extend the term of your COBRA coverage because of disability, then during the extension period, you may be required to pay even more, up to 150 percent of your health insurance premium.