It's called "Effective Marginal Tax Rate" if you want to Google it.

From the CBO; "The effective marginal tax rate (for brevity, hereafter referred to as the marginal tax rate) is the percentage of an additional dollar of earnings that is unavailable to an individual because it is paid in taxes or offset by reduced benefits from government programs."

I mean, it seems almost ridiculous to say that buying health insurance & health care is a tax, but when the government is paying over a trillion dollars a year to buy health care for everyone except those who are too young or earning too much money, that's exactly what it's become.

And I'm definitely not complaining that healthy people should not have to pay for health insurance. In fact the healthiest 50 percent of people who pay for health insurance use only 3.5 percent of services, it's what allows the entire system to work!

The difference between your risk-adjusted premiums (based on your lifetime expected payouts + margin and overhead) and the amount that you actually pay in premiums can best be described as a "tax", because if it is positive, that money is directly going towards subsidizing someone else's premiums, and it is mandated by the government.

You can make the argument that it's the right thing to do because it allows people to purchase insurance that they otherwise would be unable to afford, based on their expected risk level (ie, past health) and their current income, but it's important to understand that that's not the way insurance itself works. The insurance is simply being bundled together with that tax, so you only see the one price at the end, instead of having it broken down and itemized.