Tax & Income
Japan Salary & Tax Calculator
English interface for zeikin-style salary, resident tax, and social insurance breakdowns.
Furusato Nozei Calculator
Find your maximum donation limit for Hometown Tax (¥2,000 self-burden).
Sole Proprietor Simulator
Compare Salaryman vs. Sole Proprietor (Kojin Jigyo) taxes and take-home pay.
Assets & Planning
Japan FIRE Calculator
Plan Lean/FIRE/Wealthy targets with interactive presets, inputs, and CSV export.
Japan Mortgage Calculator
Simulate home loans with bonus payments and amortization schedules.
Nenkin (Pension) Estimator
Estimate your future Japanese pension benefits (Basic + Employees') based on your career history.
Childcare & Education Planner
Estimate total education costs from birth to university based on school choices.
Historical Currency Converter
Visualize historical exchange rates and simulate future scenarios.