the exemptions...
The Individual Mandate: How Sweeping?
The so-called individual mandate the provision under the Affordable Care Act (ACA) that requires most individuals to carry a minimum level of insurance coverage and is now being considered by the Supreme Court has emerged as the least popular element of the reform law and the prime target for its opponents. Yet in practice, the mandate may not be quite as far-reaching as the controversy over it suggests.
The vast majority of Americans already get insurance from their employers, Medicaid, Medicare, the individual market, or other sources of coverage, and will essentially automatically comply with the mandate once it goes into effect in 2014. The Congressional Budget Office (CBO) projects that about 80% of the 272 million non-elderly people in 2014 would be insured even in the absence of the ACA and would therefore already fulfill the mandates requirement.
Also, although the ACA requires people to maintain health insurance or else pay a penalty, the law allows a series of exemptions and special considerations, meaning that millions of individuals could be exempt from the requirement to maintain coverage.
The mandates exemptions cover a variety of people, including: members of certain religious groups and Native American tribes; undocumented immigrants (who are not eligible for health insurance subsidies under the law); incarcerated individuals; people whose incomes are so low they dont have to file taxes (currently $9,500 for individuals and $19,000 for married couples); and people for whom health insurance is considered unaffordable (where insurance premiums after employer contributions and federal subsidies exceed 8% of family income).
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http://healthreform.kff.org/notes-on-health-insurance-and-reform/2012/march/the-individual-mandate-how-sweeping.aspx