What's the criteria for 'reasonable affordability'? 
I don't see any references to IRS Code, Subtitle D, Chapter 48, Section 5000A online.
All I see is:
Individual Mandate
The Act mandates that all United States citizens and legal residents have qualifying health coverage (Internal Revenue Service [IRS] Code, Subtitle D, Chapter 48, Section 5000A(a)). 
The Act prescribes penalties for individuals who fail to obtain bureaucrat-approved health insurance.  In 2016, these penalties will be $750 per year for an individual and up to $2,250 per family, or 2 percent of household income, whichever is greater (IRS Code, Subtitle D, Chapter 48, Section 5000A(b)(c)).  After 2016, the penalty will increase annually based on a formula (IRS Code, Subtitle D, Chapter 48, Section 5000A(c)(3)(D)). 
Exemptions to the tax penalty only apply for individuals with certain religious objections (IRS Code, Subtitle D, Chapter 48, Section 5000A(d)(2)), illegal immigrants (IRS Code, Subtitle D, Chapter 48, Section 5000A(d)(3)), incarcerated individuals (IRS Code, Subtitle D, Chapter 48, Section 5000A(d)(4)), 
some individuals with financial hardships (IRS Code, Subtitle D, Chapter 48, Section 5000A(e)(1)), and members of Indian tribes (IRS Code, Subtitle D, Chapter 48, Section 5000A(e)(3)).  
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So in 2016 the fine is $750 per year for individuals and up to $2250 per family or 2% of household income.
AFTER 2016 the penalty increases annually on a formula that I don't see defined.
I like the exemption part, 'certain religious objections', 'illegal immigrants', 'jail birds', and members of 'indian tribes'.
So much for everyone paying their 'fair share'