{"service":"personal US tax / payroll compute","routes":{"/tax/income":"federal (+ optional flat-state) income tax estimate","/tax/fica":"Social Security + Medicare payroll tax, or self-employment tax","/tax/capgains":"capital gains (long/short) + NIIT","/tax/paycheck":"composite take-home / disposable income","/tax/brackets":"reference bracket / standard-deduction / FICA table","/tax/info":"this free coverage + provenance document"},"filing_statuses":["single","married_jointly","married_separately","head_of_household"],"supported_tax_years":[2026],"supported_states":["AK","CO","FL","IL","IN","MI","NC","NH","NV","PA","SD","TN","TX","WA","WY"],"state_coverage_note":"State coverage is a data-driven demo set: no-income-tax and flat-rate states only. Progressive-bracket states are a planned data addition.","method":"pure local computation over the caller's own inputs; no data fetched","provenance":"IRS Rev. Proc. 2025-32; SSA 2026 contribution & benefit base; Tax Foundation state individual income tax rates 2026","disclaimer":"estimate for reference only, not tax advice"}