Our product principle
A polished result is not enough. Users should be able to see which tax year is modeled, which rules are included, which rules are not included, and where the source data came from.
How coverage grows
Coverage spans 50 of the 51 United States income-tax jurisdictions — the fifty states plus the District of Columbia. A jurisdiction is published only after its rates, deductions, payroll assessments, effective dates, and official sources have been checked against that jurisdiction’s own published guidance for the modeled tax year.
The remaining jurisdiction is held back on purpose rather than quietly approximated. Where the calculator cannot yet model a rule correctly — a recapture provision, a credit structure, a local rate that has not been confirmed — the jurisdiction stays unpublished, because a confident wrong number is worse than an absent one.
What comes next
The roadmap includes a 401(k) scenario tool, state comparisons, a 1099 estimator, and a protected AI advisor. Trust, calculation quality, privacy, accessibility, and performance are launch gates for each phase.
Try the calculator or review the calculation methodology.