Tax Calc runs on your own machine — the client starts it, so there is no endpoint to ping. Last commit 22 Oct 2026.
US federal income tax estimates: brackets, marginal rate, effective rate. Planning values.
Nothing serious here today
Today is the operative word: we check Tax Calc every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Alternatives to Tax Calc
same job, measured the same wayDividend portfolio tracking and planning for US and EU markets: income, safety, Spain-aware taxes.
US federal + state quarterly estimated tax estimates, SE tax, and quarterly payment due dates.
QRetro retrospectives and planning poker over MCP: boards, action items, poker games, estimates.
Which published US federal rules take effect between two dates, and which CFR parts they amend?
Travel planning: day-by-day itineraries, packing lists, weather insights, and trip cost estimates
Filing-grounded US financial data — every value returns with its SEC filing source. No estimates.
Federal tax estimate, deadlines, FBAR/8938/3520 checks, §7702 screen, inherited-stock step-up.
Verified SEC filing data for US equities: fundamentals, point-in-time values, 13F holders, insiders
Tax Calc — questions
Answers built from our own checks of this server.