Tools
These tools are designed to be static-first and privacy-friendly. We store public tool state in your browser.
Supplemental tax calculator (shell)
A safe starting point — add your numbers, see estimated scenarios.
Assessment appeal deadline calculator
Guidance for common deadline patterns (verify with official sources).
Prop 19 / 58 / 193 eligibility checker
Rule-of-thumb flow; does not replace professional advice.
Estimate comparison tool
Compare scenarios and assumptions side-by-side.
Tax savings / exemption wizard
Find potential exemptions to ask about.
Fiscal year date span
Days between two dates, with July 1–June 30 segments for California property-tax fiscal years.
Ownership change month proration
Illustrative supplemental proration percentages by month of transfer (rule-of-thumb table).