I agree with you 100% that this should be standard everywhere, but here's the thing... this information is readily available already.
At least in the US. But just like with most thing, it takes citizens a willingness to show the tiniest bit of effort to find that information.
https://www.cbo.gov/publication/58888
This is but one of many sites which show a breakdown of where our money in the US goes. Having one that breaks down each person's personal contribution would be especially interesting, but a percent is a percent so if 20% of our money collectively goes to X, then 20% of what your paid as an individual will also go to X.