> My uninformed impression is that in the US one does not pay proportionately the same amount of taxes towards healthcare (maybe you have citations to the contrary?).

Each and every report of US healthcare costs and funding. I'll just grab from the wikipedia article [0] for now.

> Public spending accounts for between 45% and 56.1% of U.S. health care spending.

And one of the pretty handy graphs [1]

Worth noting that this is with a lot of people unable to afford treatment.

[0] https://en.wikipedia.org/wiki/Health_care_finance_in_the_Uni...

[1] https://upload.wikimedia.org/wikipedia/commons/thumb/f/f7/OE...

Edit: Has to be coupled with public spending in other nations to be complete. There is another article related to the graph [2] with another easy to understand graph [3]

[2] https://en.wikipedia.org/wiki/List_of_countries_by_total_hea...

[3] https://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/OE...