Federal taxes

EstimateMedicareTax takes into account: - filing status - for wages: the base medicare rate, plus the threshold above which an additional rate is imposed - for capital gains: the threshold above which NIIT is imposed As far as I can tell, the way this works is: - wage income is taxed "first", with two brackets: 1.45%, and 2.35% - investment income is taxed "second", with two brackets: 0%, and 3.8% "second" meaning: start with the wage income from 0, then add the investment income on top of that - no deductions are applicable - income is taxed either as wage or as investment, but never as both Some resources: - https://www.irs.gov/taxtopics/tc559.

some social security resources: https://www.ssa.gov/oact/cola/cbb.html#:~:text=For%20earnings%20in%202024%2C%20this,for%20employees%20and%20employers%2C%20each.

TODO as of Oct 2024, these are not yet official.

TaxYearConstants organizes key constants for each tax year Some notes: - half of social security is typically paid by the employer - the social security limit is per-person - half of medicare is typically paid by the employer - the medicare threshold limit is per-person according to https://www.irs.gov/taxtopics/tc751 -- but TODO, am I misunderstanding that?.