If you get insurance from the marketplace, expect to receive a form 1095-A. You cannot file without it. And it disqualifies you from filing the 1040EZ. Next, you would need to file form 8962 to true up your subsidy based on estimated income with your actual income. Yes, you are responsible to pay the difference. Or you could actually get additional credits if you overestimated income.
Uninsured? And that includes ANYONE you claim as a dependent. You have a penalty calculation to do and yet another form, 8965, to file to claim an exception. And, oh, by the way, the penalty is the GREATER of $95 or 1% of your MAGI, PER PERSON. Half that for children. Yes, there are caps on all that but only if you are below 400% of the Federal Poverty Level.
Think you can avoid the bill by adjusting withholding to have a zero refund? Think again. All the IRS is prevented from with respect to the ACA is using their Liens and Levy toolkit. All other collection methods are in play. You still owe the amount and interest will accrue. Sooner or later there will be an offset from any other gubermint money coming your way.
As soon as anyone is actually dinged for the tax, then he has standing to appeal that it is an unconstitutional tax (the Roberts court did not treat that aspect of it, it only said it was a tax).
So it’s possible that King Barack may tell the IRS not to ding anybody.