While the most sweeping provisions of the health care overhaul have not yet gone into effect, plenty of Americans will still be paying higher insurance premiums this year -- as insurance companies try to preemptively cover the cost of a tax increase included in President Obama's Affordable Care Act.

That tax doesn't take effect until next year, when other major provisions like the so-called "individual mandate" and insurance subsidies also kick in. But that hasn't stopped insurance companies from charging higher premiums this year to cover the hike, as well as the cost of ObamaCare benefits such as free birth control and preventive care.