Marie, I apologize that the following information is US-relevant only, but I think it's worth sharing since a large portion of the readership here is US-based.
There's an awful lot of misinformation out there around Obamacare/The Affordable Care Act/ACA.
I dug in and did my homework when my HR lady mentioned in passing that she though our premiums might double between 2014 and 2015 (they ended up going up only a little).
The ACA works by letting
some people get a a
subsidy on their health insurance premiums.
Some people means people who don't have access to an "affordable health plan" through their employer.
A
subsidy is just what it sounds like- your health plan still costs what it costs, but the government pays part of it for you.
This is relevant to the topic at hand, because your health care costs could change dramatically if you move from a plan through your job to a plan subsidized by the ACA. That's not surprising, but
whether the cost changes upward or downward might surprise you. I was very surprised to find out that mine would go down significantly.
So me personally, I'm a family of five.
My current health plan costs $17,600/year. I pay $6,700; my employer pays $10,900. (About 40%/60% split.)
A similar plan (none matched exactly) on the ACA Exchange would cost $11,500/year. I'd pay $4,100; the gov't would pay $7,400. (Coincidentally, also about 40%/60% split.)
(I got these prices here; as far as I can tell, they're real prices.)
So for me, health insurance would be, net, about $2,600 cheaper per year if I were self-employed.
The subsidy is largest at low incomes and smallest at high incomes, a sliding scale, so if I became self-employed AND I didn't earn as much, my net health insurance cost would be even smaller.
(Watch out, there's an income level where you can get screwed in some states- too low for an ACA subsidy, too high for Medicare.)
The point is, common sense will not serve you here. It's imperative to do your homework and find out for your specific circumstance what your health insurance bill might be if you quit your full-time job. In my case, it will be good news. For people in other states, at other ages, at other income levels, and who are currently paying a different share of their employer-sponsored plan, it might be good news or it might not. Do your homework!