A family of four at 138% FPL ($33,465) has their contribution amount limited to 0.0331 (3.31%) of their MAGI. Their annual contribution amount would be no more than $1,107.69, or $92.31 per month.Let's use a current example with a family of 4 in FL 33710, Hus and Wife 45, Both NS, Kids M 14 and F 12 at 138% FPL or $33,465. This gives a tax credit of $538 per month for 2016.
Cheapest Silver for 2015 excluding quality of network and so on is FL Blue 1443 @ $657 Before APTC after $ 74.
Now increase that monthly premium before APTC By 30%. What was $ 74 per month now increases to $ 271.10 per month. That's 366% + rate increase to those who are in the 138% FPL or close to 10% of their yearly earnings.
The $92.31 contribution amount is compared to the SLCSP and the PTC is the difference. If the lowest cost silver plan increased 30% and the SLCSP experienced no change, their premium would rise from $74 to no more than $92.31 for the lowest silver plan.
If the family selects a plan more expensive than the SLCSP, the family is responsible for their contribution amount plus the difference between the SLCSP and their plan.
The contribution amount percentages are found in Table 2 of IRS Form 8962 below. The 2015 contribution limit of 9.56% for 300-400% FPL is increased to 9.66% for 2016.
https://www.irs.gov/pub/irs-pdf/i8962.pdf
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