Affordable Care Act
The affordability threshold is 8.05% for 2018. Filing thresholds and Federal poverty line tables have been adjusted for inflation.
Taxpayers who have qualifying health care coverage or a coverage exemption that covered all of 2018 or a combination of qualifying health care coverage and coverage exemption(s) for every month of 2018 can now check the "Full-year health care coverage or exempt" box in front of Form 1040.
The Shared Responsibility Payment (SRP) percentage of income amount and flat dollar amount are unchanged for tax year 2018.
For tax years beginning after December 31, 2018, the SRP is zero.
Details about these and other updates can be found in the Affordable Care Act lesson and in Publication 4012 Tab H, Other Taxes, Payments and ACA.