Code DD in box 12 of your W2 shows the cost of the health benefits from your employer.
https://www.irs.gov/affordable-care-act/form-w-2-reporting-o...
> The Affordable Care Act requires employers to report the cost of coverage under an employer-sponsored group health plan. Reporting the cost of health care coverage on the Form W-2 does not mean that the coverage is taxable. The value of the employer’s excludable contribution to health coverage continues to be excludable from an employee's income, and it is not taxable. This reporting is for informational purposes only and will provide employees useful and comparable consumer information on the cost of their health care coverage.
> Employers required to file fewer than 250 Forms W-2 for the preceding calendar year (determined without application of any entity aggregation rules for related employers)
I'm guessing it's that; pretty sure we have less than 250 employees in the US.
take me for example. I have no idea how much my employer contributes to my premiums. the only way I can think of to estimate the cost is to look up typical pricing for comparable ACA plans. if we switched to universal healthcare, I have no way of knowing what fraction of those premiums would be tacked back onto my salary versus simply pocketed by my employer. all I know is that things are currently okay for me, and as long as I do the in/out-of-network dance correctly, my exposure is limited to my out-of-pocket max. outside of ideological/moral concerns, there's really no incentive for me to rock the boat.