If you don't have qualifying health coverage, you must pay a penalty known as the individual shared responsibility payment.
For 2016, the penalty is 2.5% of your household income or $695 per adult — whichever is higher. The fee rises with inflation in future years. Final 2017 amounts will be published when available.
So if you don’t have health insurance, you have to spend money on a penalty — and pay for all of your health care yourself.