Details Found in IRS Explanation Issued Wednesday; $20,000 Figure Based on a Family of Four.   In a final regulation issued Wednesday, January 30, 2013, the Internal Revenue Service (IRS) assumed that under Obamacare the cheapest health insurance plan available in 2016 for a family will cost $20,000 for the year.   Under Obamacare, Americans will be required to buy health insurance or pay a penalty to the I ...