Starting in 2014 the ACA Individual Shared Responsibility Provision kicked in, requiring most to have some sort of minimum health care - your "shared responsibility". If not there will be a penalty, imposed and collected by the IRS when you file your 2014 tax return. Per the IRS website:
"26. What happens if I do not have minimum essential coverage or an exemption, and I cannot afford to make the shared responsibility payment when filing my tax return?
The IRS routinely works with taxpayers who owe amounts they cannot afford to pay. The law prohibits the IRS from using liens or levies to collect any individual shared responsibility payment. However, if you owe a shared responsibility payment, the IRS may offset that liability against any tax refund that may be due to you.
As many workers still withhold more from their paychecks than is necessary to pay the income tax, it looks as if their refund will be smaller.
"26. What happens if I do not have minimum essential coverage or an exemption, and I cannot afford to make the shared responsibility payment when filing my tax return?
The IRS routinely works with taxpayers who owe amounts they cannot afford to pay. The law prohibits the IRS from using liens or levies to collect any individual shared responsibility payment. However, if you owe a shared responsibility payment, the IRS may offset that liability against any tax refund that may be due to you.
As many workers still withhold more from their paychecks than is necessary to pay the income tax, it looks as if their refund will be smaller.