If you are looking for information on the Affordable Care Act (ACA) here are key government websites:

• HealthCare.gov provides information about the Affordable Care Act (ACA) for individuals, families, and small businesses, as well as links to sign up for the ACA. It is managed by the Centers for Medicare & Medicaid Services. https://www.healthcare.gov/
• Tax Provisions: Internal Revenue Service provides tax related information about the ACA, addressing health insurance coverage and financial assistance options for individuals and families, including a premium tax credit. http://www.irs.gov/Affordable-Care-Act
• US Small Business Administration provides information about the Patient Protection and Affordable Care Act (Affordable Care Act or ACA). This site provides resources that help explain what the law means for small businesses and self-employed business owners. http://www.sba.gov/healthcare  
•  US Department of Labor provides information and resources related to the ACA with numerous topics related to regulations and guidance. http://www.dol.gov/ebsa/healthreform/