Effective tax rates are not that easy to compare.
In fact, the portion of a US health insurance premiums IS a tax, based on your age! Not to mention the myriad ways tax policy (including the age rating factors that cause young people to pay a tax via their health insurance premium) vary among not only the 50 states, but the smaller jurisdictions within the states.
Sure. But if you make the calculation that granular, you also need to include employer-paid health insurance on the compensation side of the ledger. More than half of Americans have employer-paid health insurance, and employers contribute on average $17,000 per employee: https://www.business.com/articles/health-insurance-costs-thi...
Of course, that is why US employees should be able to have access to benefit costs in terms of dollars to be able to compare total compensation. Currently, that is usually only available after the end of a calendar year on form W-2 (box 12 code DD for health insurance premiums).
Technically, you have to get even more granular. If your employer subsidizes health insurance premiums, then you pay for health insurance with pre tax income. If your employer does not, then you have to buy with post tax income. The difference is thousands of dollars per year.
You even avoid FICA if you can max out your HSA via payroll withholdings, a decision solely made by your employer.
It’s actually amazing how many ways the US governments has come up with to screw young people and small businesses.