November 18, 2017 00:32 Updated Follow The ACA defines insurance as "affordable" when the employee's contribution for single coverage is not more than 9.5% of the employee's salary. Related articles What if I have problems with my marketplace enrollment? Who do I call? What is "federal poverty level"? What are the basic requirements for providing health insurance to my employees? How do I file a complaint against a qualified health care provider? What is the employer penalty for not providing health insurance?